Loading...
--- Libc/Libc-320/gen/scalable_malloc.c
+++ Libc/Libc-583/gen/scalable_malloc.c
@@ -1,9 +1,7 @@
/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999, 2006 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
@@ -25,13 +23,18 @@
/* Author: Bertrand Serlet, August 1999 */
-#import "scalable_malloc.h"
-
-#import <pthread_internals.h>
-
-#import <unistd.h>
-#import <libc.h>
+#include "scalable_malloc.h"
+#include "malloc_printf.h"
+#include "_simple.h"
+
+#include <pthread_internals.h>
+
+#include <unistd.h>
+#include <libc.h>
#include <mach/vm_statistics.h>
+#include <mach/mach_init.h>
+#include <sys/types.h>
+#include <sys/mman.h>
/********************* DEFINITIONS ************************/
@@ -41,34 +44,43 @@
#if DEBUG_MALLOC
#warning DEBUG_MALLOC ENABLED
-#define INLINE
-#define CHECK_LOCKED(szone, fun) { \
- if (__is_threaded && TRY_LOCK(szone->lock)) { \
+# define INLINE
+# define ALWAYSINLINE
+# define CHECK_LOCKED(szone, fun) \
+do { \
+ if (__is_threaded && TRY_LOCK(szone->lock)) { \
malloc_printf("*** lock was not set %p in %s\n", szone->lock, fun); \
- } \
-}
+ } \
+} while (0)
#else
-#define INLINE __inline__
-#define CHECK_LOCKED(szone, fun) {}
-#endif
-
-#define PAGE_SIZE_FIXED 1 // flip if the page size becomes variable, one day
-#if PAGE_SIZE_FIXED
+# define INLINE __inline__
+# define ALWAYSINLINE __attribute__((always_inline))
+# define CHECK_LOCKED(szone, fun) {}
+#endif
+
+/*
+ * Access to global variables is slow, so optimise our handling of vm_page_size
+ * and vm_page_shift.
+ */
+#define _vm_page_size vm_page_size /* to get to the originals */
+#define _vm_page_shift vm_page_shift
+#define vm_page_size 4096 /* our normal working sizes */
#define vm_page_shift 12
-#else
-static unsigned vm_page_shift = 0; // guaranteed to be intialized by zone creation
-#endif
typedef unsigned short msize_t; // a size in multiples of SHIFT_SMALL_QUANTUM or SHIFT_TINY_QUANTUM
+typedef union {
+ void *p;
+ uintptr_t u;
+} ptr_union;
+
typedef struct {
- unsigned checksum;
- void *previous;
- void *next;
+ ptr_union previous;
+ ptr_union next;
} free_list_t;
typedef struct {
- unsigned address_and_num_pages;
+ uintptr_t address_and_num_pages;
// this type represents both an address and a number of pages
// the low bits are the number of pages; the high bits are the address
// note that the exact number of bits used for depends on the page size
@@ -79,35 +91,124 @@
#define CHECK_REGIONS (1 << 31)
-#define CHECKSUM_MAGIC 0x357B
-
#define MAX_RECORDER_BUFFER 256
/********************* DEFINITIONS for tiny ************************/
-#define SHIFT_TINY_QUANTUM 4 // Required for AltiVec
+/*
+ * Memory in the Tiny range is allocated from regions (heaps) pointed to by the szone's tiny_regions
+ * pointer.
+ *
+ * Each region is laid out as a heap, followed by a header block, all within
+ * a 1MB (2^20) block. This means there are 64520 16-byte blocks and the header is
+ * 16138 bytes, making the total 1048458 bytes, leaving 118 bytes unused.
+ * The header block is arranged:
+ *
+ * 0xfc080
+ * header bits
+ * 0xfe001
+ * 0xffffffff pad word
+ * 0xfe005
+ * in-use bits
+ * 0xfff86
+ * pad word (not written)
+ * 0xfff8a-0xfffff
+ * unused
+ *
+ * Each bitfield comprises NUM_TINY_BLOCKS bits, and refers to the corresponding TINY_QUANTUM block
+ * within the heap.
+ *
+ * The bitfields are used to encode the state of memory within the heap. The header bit indicates
+ * that the corresponding quantum is the first quantum in a block (either in use or free). The
+ * in-use bit is set for the header if the block has been handed out (allocated). If the header
+ * bit is not set, the in-use bit is invalid.
+ *
+ * The szone maintains an array of 32 freelists, each of which is used to hold
+ * free objects of the corresponding quantum size.
+ *
+ * A free block is laid out depending on its size, in order to fit all free
+ * blocks in 16 bytes, on both 32 and 64 bit platforms. One quantum blocks do
+ * not store their size in the block, instead relying on the header information
+ * to determine their size. Blocks of two or more quanta have room to store
+ * their size in the block, and store it both after the 'next' pointer, and in
+ * the last 2 bytes of the block.
+ *
+ * 1-quantum block
+ * Offset (32-bit mode) (64-bit mode)
+ * 0x0 0x0 : previous
+ * 0x4 0x08 : next
+ * end end
+ *
+ * >1-quantum block
+ * Offset (32-bit mode) (64-bit mode)
+ * 0x0 0x0 : previous
+ * 0x4 0x08 : next
+ * 0x8 0x10 : size (in quantum counts)
+ * end - 2 end - 2 : size (in quantum counts)
+ * end end
+ *
+ * All fields are pointer-sized, except for the size which is an unsigned short.
+ *
+ */
+
+#define SHIFT_TINY_QUANTUM 4 // Required for AltiVec
#define TINY_QUANTUM (1 << SHIFT_TINY_QUANTUM)
-#define FOLLOWING_TINY_PTR(ptr,msize) (((char *)(ptr)) + ((msize) << SHIFT_TINY_QUANTUM))
-
-#define NUM_TINY_SLOTS 32 // number of slots for free-lists
-
-#define SHIFT_NUM_TINY_BLOCKS 16
-#define NUM_TINY_BLOCKS (1 << SHIFT_NUM_TINY_BLOCKS)
-#define TINY_BLOCKS_ALIGN (SHIFT_NUM_TINY_BLOCKS + SHIFT_TINY_QUANTUM)
-#define TINY_REGION_SIZE ((NUM_TINY_BLOCKS * TINY_QUANTUM + (NUM_TINY_BLOCKS >> 2) + 8 + (1 << vm_page_shift) - 1) & ~ ((1 << vm_page_shift) - 1)) // enough room for the data, followed by the bit arrays (2-bits per block) plus 2 words of padding as our bitmap operators overflow, plus rounding to the nearest page
-
-#define TINY_FREE_SIZE(ptr) (((msize_t *)(ptr))[6])
-// At the end of free blocks, we stick the size (for enabling coalescing)
+#define FOLLOWING_TINY_PTR(ptr,msize) (((unsigned char *)(ptr)) + ((msize) << SHIFT_TINY_QUANTUM))
+
+#define NUM_TINY_SLOTS 32 // number of slots for free-lists
+
+#define NUM_TINY_BLOCKS 64520
+#define SHIFT_TINY_CEIL_BLOCKS 16 // ceil(log2(NUM_TINY_BLOCKS))
+#define NUM_TINY_CEIL_BLOCKS (1 << SHIFT_TINY_CEIL_BLOCKS)
+#define TINY_BLOCKS_ALIGN (SHIFT_TINY_CEIL_BLOCKS + SHIFT_TINY_QUANTUM)
+
+/*
+ * Enough room for the data, followed by the bit arrays (2-bits per block) plus 2 words of padding
+ * as our bitmap operators overflow, plus rounding to the nearest page.
+ */
+#define TINY_HEADER_SIZE ((NUM_TINY_BLOCKS >> 2) + 8)
+#define TINY_REGION_SIZE ((NUM_TINY_BLOCKS * TINY_QUANTUM + TINY_HEADER_SIZE + vm_page_size - 1) & ~ (vm_page_size - 1))
+
+/*
+ * Beginning and end pointers for a region's heap.
+ */
+#define TINY_REGION_ADDRESS(region) ((void *)(region))
+#define TINY_REGION_END(region) (TINY_REGION_ADDRESS(region) + (NUM_TINY_BLOCKS * TINY_QUANTUM))
+
+/*
+ * Locate the heap base for a pointer known to be within a tiny region.
+ */
+#define TINY_REGION_FOR_PTR(_p) ((void *)((uintptr_t)(_p) & ~((1 << TINY_BLOCKS_ALIGN) - 1)))
+
+/*
+ * Convert between byte and msize units.
+ */
+#define TINY_BYTES_FOR_MSIZE(_m) ((_m) << SHIFT_TINY_QUANTUM)
+#define TINY_MSIZE_FOR_BYTES(_b) ((_b) >> SHIFT_TINY_QUANTUM)
+
+#ifdef __LP64__
+# define TINY_FREE_SIZE(ptr) (((msize_t *)(ptr))[8])
+#else
+# define TINY_FREE_SIZE(ptr) (((msize_t *)(ptr))[4])
+#endif
#define TINY_PREVIOUS_MSIZE(ptr) ((msize_t *)(ptr))[-1]
-
-#define TINY_REGION_ADDRESS(region) ((region) << TINY_BLOCKS_ALIGN)
-#define TINY_REGION_END(region) (TINY_REGION_ADDRESS(region)+(1 << TINY_BLOCKS_ALIGN))
-
-typedef unsigned short tiny_region_t;
-
-#define INITIAL_NUM_TINY_REGIONS 24 // must be even for szone to be aligned
+/*
+ * Locate the block header for a pointer known to be within a tiny region.
+ */
+#define TINY_HEADER_START (NUM_TINY_BLOCKS * TINY_QUANTUM)
+#define TINY_BLOCK_HEADER_FOR_PTR(_p) ((void *)((uintptr_t)TINY_REGION_FOR_PTR(_p) + TINY_HEADER_START))
+
+/*
+ * Locate the inuse map for a given block header pointer.
+ */
+#define TINY_INUSE_FOR_HEADER(_h) ((void *)((uintptr_t)(_h) + (NUM_TINY_BLOCKS >> 3) + 4))
+
+/*
+ * Compute the bitmap index for a pointer known to be within a tiny region.
+ */
+#define TINY_INDEX_FOR_PTR(_p) (((uintptr_t)(_p) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_CEIL_BLOCKS - 1))
#define TINY_CACHE 1 // This governs a last-free cache of 1 that bypasses the free-list
@@ -117,43 +218,105 @@
/********************* DEFINITIONS for small ************************/
-/* We store the meta bits on the side in two bytes, as follows:
-- high order bit SMALL_IS_FREE is set when the block is avail (and starts here)
-- when block size, expressed in SMALL_QUANTUM, is the other 15 bits
-- else 0 signifies this block is in the middle of another block
-*/
-
-#define SMALL_IS_FREE (1 << 15)
+/*
+ * Memory in the Small range is allocated from regions (heaps) pointed to by the szone's small_regions
+ * pointer.
+ *
+ * Each region is laid out as a heap, followed by the metadata array, all within an 8MB (2^23) block.
+ * The array is arranged as an array of shorts, one for each SMALL_QUANTUM in the heap.
+ * This means there are 16320 512-blocks and the array is 16320*2 bytes, which totals 8388480, leaving
+ * 128 bytes unused.
+ *
+ * The MSB of each short is set for the first quantum in a free block. The low 15 bits encode the
+ * block size (in SMALL_QUANTUM units), or are zero if the quantum is not the first in a block.
+ *
+ * The szone maintains an array of 32 freelists, each of which is used to hold free objects
+ * of the corresponding quantum size.
+ *
+ * A free block is laid out as:
+ *
+ * Offset (32-bit mode) (64-bit mode)
+ * 0x0 0x0 : previous
+ * 0x4 0x08 : next
+ * 0x8 0x10 : size (in quantum counts)
+ * end - 2 end - 2 : size (in quantum counts)
+ * end end
+ *
+ * All fields are pointer-sized, except for the size which is an unsigned short.
+ *
+ */
+
+#define SMALL_IS_FREE (1 << 15)
#define SHIFT_SMALL_QUANTUM (SHIFT_TINY_QUANTUM + 5) // 9
#define SMALL_QUANTUM (1 << SHIFT_SMALL_QUANTUM) // 512 bytes
-#define FOLLOWING_SMALL_PTR(ptr,msize) (((char *)(ptr)) + ((msize) << SHIFT_SMALL_QUANTUM))
-
-#define NUM_SMALL_SLOTS 32 // number of slots for free-lists
-
-#define SHIFT_NUM_SMALL_BLOCKS 14 // we can only represent up to 1<<15 for msize; but we chose to stay even below that to avoid the convention msize=0 => msize = (1<<15)
-#define NUM_SMALL_BLOCKS (1 << SHIFT_NUM_SMALL_BLOCKS)
-#define SMALL_BLOCKS_ALIGN (SHIFT_NUM_SMALL_BLOCKS + SHIFT_SMALL_QUANTUM) // 23
-#define SMALL_REGION_SIZE (NUM_SMALL_BLOCKS * SMALL_QUANTUM + NUM_SMALL_BLOCKS * 2) // data + meta data
+#define FOLLOWING_SMALL_PTR(ptr,msize) (((unsigned char *)(ptr)) + ((msize) << SHIFT_SMALL_QUANTUM))
+
+#define NUM_SMALL_SLOTS 32 // number of slots for free-lists
+
+/*
+ * We can only represent up to 1<<15 for msize; but we choose to stay even below that to avoid the
+ * convention msize=0 => msize = (1<<15)
+ */
+#define NUM_SMALL_BLOCKS 16320
+#define SHIFT_SMALL_CEIL_BLOCKS 14 // ceil(log2(NUM_SMALL_BLOCKs))
+#define NUM_SMALL_CEIL_BLOCKS (1 << SHIFT_SMALL_CEIL_BLOCKS)
+#define SMALL_BLOCKS_ALIGN (SHIFT_SMALL_CEIL_BLOCKS + SHIFT_SMALL_QUANTUM) // 23
+#define SMALL_ARRAY_SIZE (NUM_SMALL_BLOCKS * 2)
+#define SMALL_REGION_SIZE ((NUM_SMALL_BLOCKS * SMALL_QUANTUM + SMALL_ARRAY_SIZE + vm_page_size - 1) & ~ (vm_page_size - 1)) // data + meta data
#define SMALL_PREVIOUS_MSIZE(ptr) ((msize_t *)(ptr))[-1]
-#define SMALL_REGION_ADDRESS(region) (((unsigned)region) << SMALL_BLOCKS_ALIGN)
-#define SMALL_REGION_END(region) (SMALL_REGION_ADDRESS(region)+(1 << SMALL_BLOCKS_ALIGN))
-
-typedef unsigned short small_region_t;
-
-#define INITIAL_NUM_SMALL_REGIONS 6 // must be even for szone to be aligned
-
-#define PROTECT_SMALL 0 // Should be 0: 1 is too slow for normal use
+/*
+ * Convert between byte and msize units.
+ */
+#define SMALL_BYTES_FOR_MSIZE(_m) ((_m) << SHIFT_SMALL_QUANTUM)
+#define SMALL_MSIZE_FOR_BYTES(_b) ((_b) >> SHIFT_SMALL_QUANTUM)
+
+
+#define SMALL_REGION_ADDRESS(region) ((unsigned char *)region)
+#define SMALL_REGION_END(region) (SMALL_REGION_ADDRESS(region) + (NUM_SMALL_BLOCKS * SMALL_QUANTUM))
+
+/*
+ * Locate the heap base for a pointer known to be within a small region.
+ */
+#define SMALL_REGION_FOR_PTR(_p) ((void *)((uintptr_t)(_p) & ~((1 << SMALL_BLOCKS_ALIGN) - 1)))
+
+/*
+ * Locate the metadata base for a pointer known to be within a small region.
+ */
+#define SMALL_HEADER_START (NUM_SMALL_BLOCKS * SMALL_QUANTUM)
+#define SMALL_META_HEADER_FOR_PTR(_p) ((msize_t *)((uintptr_t)SMALL_REGION_FOR_PTR(_p) + SMALL_HEADER_START))
+
+/*
+ * Compute the metadata index for a pointer known to be within a small region.
+ */
+#define SMALL_META_INDEX_FOR_PTR(_p) (((uintptr_t)(_p) >> SHIFT_SMALL_QUANTUM) & (NUM_SMALL_CEIL_BLOCKS - 1))
+
+/*
+ * Find the metadata word for a pointer known to be within a small region.
+ */
+#define SMALL_METADATA_FOR_PTR(_p) (SMALL_META_HEADER_FOR_PTR(_p) + SMALL_META_INDEX_FOR_PTR(_p))
+
+/*
+ * Determine whether a pointer known to be within a small region points to memory which is free.
+ */
+#define SMALL_PTR_IS_FREE(_p) (*SMALL_METADATA_FOR_PTR(_p) & SMALL_IS_FREE)
+
+/*
+ * Extract the msize value for a pointer known to be within a small region.
+ */
+#define SMALL_PTR_SIZE(_p) (*SMALL_METADATA_FOR_PTR(_p) & ~SMALL_IS_FREE)
+
+#define PROTECT_SMALL 0 // Should be 0: 1 is too slow for normal use
#define SMALL_CACHE 1
#if !SMALL_CACHE
#warning SMALL_CACHE turned off
#endif
-/********************* DEFINITIONS for large ************************/
+/********************* DEFINITIONS for large and huge ***********************/
#define LARGE_THRESHOLD (15 * 1024) // at or above this use "large"
@@ -166,21 +329,38 @@
// But if the memory is only read, vm_copy() wins over memmove() at 3 or 4 pages (on a G3/300MHz)
// This must be larger than LARGE_THRESHOLD
+/*
+ * Given a large_entry, return the address of the allocated block.
+ */
#define LARGE_ENTRY_ADDRESS(entry) \
- (((entry).address_and_num_pages >> vm_page_shift) << vm_page_shift)
+ (void *)(((entry).address_and_num_pages >> vm_page_shift) << vm_page_shift)
+
+/*
+ * Given a large entry, return the number of pages or bytes in the allocated block.
+ */
#define LARGE_ENTRY_NUM_PAGES(entry) \
- ((entry).address_and_num_pages & ((1 << vm_page_shift) - 1))
+ ((entry).address_and_num_pages & (vm_page_size - 1))
#define LARGE_ENTRY_SIZE(entry) \
(LARGE_ENTRY_NUM_PAGES(entry) << vm_page_shift)
+
+/*
+ * Compare a pointer with a large entry.
+ */
#define LARGE_ENTRY_MATCHES(entry,ptr) \
- (!(((entry).address_and_num_pages - (unsigned)(ptr)) >> vm_page_shift))
-#define LARGE_ENTRY_IS_EMPTY(entry) (!((entry).address_and_num_pages))
+ ((((entry).address_and_num_pages - (uintptr_t)(ptr)) >> vm_page_shift) == 0)
+
+#define LARGE_ENTRY_IS_EMPTY(entry) (((entry).address_and_num_pages) == 0)
typedef compact_range_t large_entry_t;
-
-/********************* DEFINITIONS for huge ************************/
-
typedef vm_range_t huge_entry_t;
+
+/*******************************************************************************
+ * Definitions for region hash
+ ******************************************************************************/
+
+typedef void * region_t;
+
+#define INITIAL_NUM_REGIONS 63 // Must be odd to hash well
/********************* zone itself ************************/
@@ -191,95 +371,242 @@
void *log_address;
/* Regions for tiny objects */
- unsigned num_tiny_regions;
- tiny_region_t *tiny_regions;
+ size_t num_tiny_regions;
+ size_t num_tiny_regions_allocated;
+ region_t *tiny_regions; // hashed by location
+ region_t *last_tiny_region;
void *last_tiny_free; // low SHIFT_TINY_QUANTUM indicate the msize
unsigned tiny_bitmap; // cache of the 32 free lists
free_list_t *tiny_free_list[NUM_TINY_SLOTS]; // 31 free lists for 1*TINY_QUANTUM to 31*TINY_QUANTUM plus 1 for larger than 32*SMALL_QUANTUM
size_t tiny_bytes_free_at_end; // the last free region in the last block is treated as a big block in use that is not accounted for
unsigned num_tiny_objects;
- unsigned num_bytes_in_tiny_objects;
+ size_t num_bytes_in_tiny_objects;
/* Regions for small objects */
- unsigned num_small_regions;
- small_region_t *small_regions;
+ size_t num_small_regions;
+ size_t num_small_regions_allocated;
+ region_t *small_regions; // hashed by location
+ region_t *last_small_region;
void *last_small_free; // low SHIFT_SMALL_QUANTUM indicate the msize
unsigned small_bitmap; // cache of the free list
free_list_t *small_free_list[NUM_SMALL_SLOTS];
size_t small_bytes_free_at_end; // the last free region in the last block is treated as a big block in use that is not accounted for
unsigned num_small_objects;
- unsigned num_bytes_in_small_objects;
+ size_t num_bytes_in_small_objects;
/* large objects: vm_page_shift <= log2(size) < 2 *vm_page_shift */
unsigned num_large_objects_in_use;
unsigned num_large_entries;
large_entry_t *large_entries; // hashed by location; null entries don't count
- unsigned num_bytes_in_large_objects;
+ size_t num_bytes_in_large_objects;
/* huge objects: log2(size) >= 2 *vm_page_shift */
- unsigned char num_huge_entries;
+ unsigned num_huge_entries;
huge_entry_t *huge_entries;
- unsigned num_bytes_in_huge_objects;
+ size_t num_bytes_in_huge_objects;
/* Initial region list */
- tiny_region_t initial_tiny_regions[INITIAL_NUM_TINY_REGIONS];
- small_region_t initial_small_regions[INITIAL_NUM_SMALL_REGIONS];
+ region_t initial_tiny_regions[INITIAL_NUM_REGIONS];
+ region_t initial_small_regions[INITIAL_NUM_REGIONS];
} szone_t;
-static void *szone_malloc(szone_t *szone, size_t size);
-static INLINE void *szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested);
-static void szone_free(szone_t *szone, void *ptr);
-static boolean_t szone_check_all(szone_t *szone, const char *function);
-static void szone_print(szone_t *szone, boolean_t verbose);
-static void *small_malloc_from_region_no_lock(szone_t *szone, msize_t msize);
-
-#if DEBUG_MALLOC
-#define LOG(szone,ptr) \
- (szone->log_address && (((unsigned)szone->log_address == -1) || (szone->log_address == (void *)(ptr))))
+#define SZONE_PAGED_SIZE ((sizeof(szone_t) + vm_page_size - 1) & ~ (vm_page_size - 1))
+
+#if DEBUG_MALLOC || DEBUG_CLIENT
+static void szone_sleep(void);
+#endif
+__private_extern__ void malloc_error_break(void);
+
+// msg prints after fmt, ...
+static void szone_error(szone_t *szone, const char *msg, const void *ptr, const char *fmt, ...) __printflike(4, 5);
+
+static void protect(void *address, size_t size, unsigned protection, unsigned debug_flags);
+static void *allocate_pages(szone_t *szone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label);
+static void deallocate_pages(szone_t *szone, void *addr, size_t size, unsigned debug_flags);
+static kern_return_t _szone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr);
+
+static INLINE void free_list_checksum(szone_t *szone, free_list_t *ptr, const char *msg) ALWAYSINLINE;
+static INLINE void free_list_set_checksum(szone_t *szone, free_list_t *ptr) ALWAYSINLINE;
+static INLINE uintptr_t free_list_checksum_ptr(void *p) ALWAYSINLINE;
+static INLINE void * free_list_unchecksum_ptr(ptr_union ptr) ALWAYSINLINE;
+static unsigned free_list_count(const free_list_t *ptr);
+
+static INLINE msize_t get_tiny_meta_header(const void *ptr, boolean_t *is_free) ALWAYSINLINE;
+static INLINE void set_tiny_meta_header_in_use(const void *ptr, msize_t msize) ALWAYSINLINE;
+static INLINE void set_tiny_meta_header_middle(const void *ptr) ALWAYSINLINE;
+static INLINE void set_tiny_meta_header_free(const void *ptr, msize_t msize) ALWAYSINLINE;
+static INLINE boolean_t tiny_meta_header_is_free(const void *ptr) ALWAYSINLINE;
+static INLINE void *tiny_previous_preceding_free(void *ptr, msize_t *prev_msize) ALWAYSINLINE;
+static void tiny_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize);
+static void tiny_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize);
+static INLINE region_t *tiny_region_for_ptr_no_lock(szone_t *szone, const void *ptr) ALWAYSINLINE;
+static INLINE void tiny_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize) ALWAYSINLINE;
+static void *tiny_malloc_from_region_no_lock(szone_t *szone, msize_t msize);
+static INLINE boolean_t try_realloc_tiny_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
+static boolean_t tiny_check_region(szone_t *szone, region_t region);
+static kern_return_t tiny_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder);
+static void *tiny_malloc_from_free_list(szone_t *szone, msize_t msize);
+static INLINE void *tiny_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) ALWAYSINLINE;
+static INLINE void free_tiny(szone_t *szone, void *ptr, region_t *tiny_region) ALWAYSINLINE;
+static void print_tiny_free_list(szone_t *szone);
+static void print_tiny_region(boolean_t verbose, region_t region, size_t bytes_at_end);
+static boolean_t tiny_free_list_check(szone_t *szone, grain_t slot);
+
+static INLINE void small_meta_header_set_is_free(msize_t *meta_headers, unsigned index, msize_t msize) ALWAYSINLINE;
+static INLINE void small_meta_header_set_in_use(msize_t *meta_headers, msize_t index, msize_t msize) ALWAYSINLINE;
+static INLINE void small_meta_header_set_middle(msize_t *meta_headers, msize_t index) ALWAYSINLINE;
+static void small_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize);
+static void small_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize);
+static INLINE region_t *small_region_for_ptr_no_lock(szone_t *szone, const void *ptr) ALWAYSINLINE;
+static INLINE void small_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize) ALWAYSINLINE;
+static void *small_malloc_from_region_no_lock(szone_t *szone, msize_t msize);
+static INLINE boolean_t try_realloc_small_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
+static boolean_t szone_check_small_region(szone_t *szone, region_t region);
+static kern_return_t small_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder);
+static void *small_malloc_from_free_list(szone_t *szone, msize_t msize);
+static INLINE void *small_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) ALWAYSINLINE;
+static INLINE void *small_malloc_cleared_no_lock(szone_t *szone, msize_t msize) ALWAYSINLINE;
+static INLINE void free_small(szone_t *szone, void *ptr, region_t *small_region) ALWAYSINLINE;
+static void print_small_free_list(szone_t *szone);
+static void print_small_region(szone_t *szone, boolean_t verbose, region_t region, size_t bytes_at_end);
+static boolean_t small_free_list_check(szone_t *szone, grain_t grain);
+
+static region_t * hash_lookup_region_no_lock(region_t *regions, size_t num_entries, region_t r);
+static void hash_region_insert_no_lock(region_t *regions, size_t num_entries, region_t r);
+static region_t * hash_regions_alloc_no_lock(szone_t *szone, size_t num_entries);
+static region_t * hash_regions_grow_no_lock(szone_t *szone, region_t *regions, size_t old_size, size_t *new_size);
+
+#if DEBUG_MALLOC
+static void large_debug_print(szone_t *szone);
+#endif
+static large_entry_t *large_entry_for_pointer_no_lock(szone_t *szone, const void *ptr);
+static void large_entry_insert_no_lock(szone_t *szone, large_entry_t range);
+static INLINE void large_entries_rehash_after_entry_no_lock(szone_t *szone, large_entry_t *entry) ALWAYSINLINE;
+static INLINE large_entry_t *large_entries_alloc_no_lock(szone_t *szone, unsigned num) ALWAYSINLINE;
+static void large_entries_free_no_lock(szone_t *szone, large_entry_t *entries, unsigned num, vm_range_t *range_to_deallocate);
+static large_entry_t * large_entries_grow_no_lock(szone_t *szone, vm_range_t *range_to_deallocate);
+static vm_range_t large_free_no_lock(szone_t *szone, large_entry_t *entry);
+static kern_return_t large_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t large_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder);
+static huge_entry_t *huge_entry_for_pointer_no_lock(szone_t *szone, const void *ptr);
+static boolean_t huge_entry_append(szone_t *szone, huge_entry_t huge);
+static kern_return_t huge_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t huge_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder);
+static void *large_and_huge_malloc(szone_t *szone, size_t num_pages);
+static INLINE void free_large_or_huge(szone_t *szone, void *ptr) ALWAYSINLINE;
+static INLINE int try_realloc_large_or_huge_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
+
+static void szone_free(szone_t *szone, void *ptr);
+static INLINE void *szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested) ALWAYSINLINE;
+static void *szone_malloc(szone_t *szone, size_t size);
+static void *szone_calloc(szone_t *szone, size_t num_items, size_t size);
+static void *szone_valloc(szone_t *szone, size_t size);
+static size_t szone_size(szone_t *szone, const void *ptr);
+static void *szone_realloc(szone_t *szone, void *ptr, size_t new_size);
+static unsigned szone_batch_malloc(szone_t *szone, size_t size, void **results, unsigned count);
+static void szone_batch_free(szone_t *szone, void **to_be_freed, unsigned count);
+static void szone_destroy(szone_t *szone);
+static size_t szone_good_size(szone_t *szone, size_t size);
+
+static boolean_t szone_check_all(szone_t *szone, const char *function);
+static boolean_t szone_check(szone_t *szone);
+static kern_return_t szone_ptr_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder);
+static void szone_print(szone_t *szone, boolean_t verbose);
+static void szone_log(malloc_zone_t *zone, void *log_address);
+static void szone_force_lock(szone_t *szone);
+static void szone_force_unlock(szone_t *szone);
+
+static void szone_statistics(szone_t *szone, malloc_statistics_t *stats);
+
+static void *frozen_malloc(szone_t *zone, size_t new_size);
+static void *frozen_calloc(szone_t *zone, size_t num_items, size_t size);
+static void *frozen_valloc(szone_t *zone, size_t new_size);
+static void *frozen_realloc(szone_t *zone, void *ptr, size_t new_size);
+static void frozen_free(szone_t *zone, void *ptr);
+static void frozen_destroy(szone_t *zone);
+
+#if DEBUG_MALLOC
+# define LOG(szone,ptr) \
+ (szone->log_address && (((uintptr_t)szone->log_address == -1) || (szone->log_address == (void *)(ptr))))
#else
-#define LOG(szone,ptr) 0
-#endif
-
-#define SZONE_LOCK(szone) { \
- LOCK(szone->lock); \
-}
-
-#define SZONE_UNLOCK(szone) { \
- UNLOCK(szone->lock); \
-}
-
-#define LOCK_AND_NOTE_LOCKED(szone,locked) { \
- CHECK(szone, __PRETTY_FUNCTION__); \
- locked = 1; SZONE_LOCK(szone); \
-}
+# define LOG(szone,ptr) 0
+#endif
+
+#define SZONE_LOCK(szone) \
+ do { \
+ LOCK(szone->lock); \
+ } while (0)
+
+#define SZONE_UNLOCK(szone) \
+ do { \
+ UNLOCK(szone->lock); \
+ } while (0)
+
+#define LOCK_AND_NOTE_LOCKED(szone,locked) \
+do { \
+ CHECK(szone, __PRETTY_FUNCTION__); \
+ locked = 1; SZONE_LOCK(szone); \
+} while (0)
#if DEBUG_MALLOC || DEBUG_CLIENT
-#define CHECK(szone,fun) \
+# define CHECK(szone,fun) \
if ((szone)->debug_flags & CHECK_REGIONS) szone_check_all(szone, fun)
#else
-#define CHECK(szone,fun) {}
+# define CHECK(szone,fun) do {} while (0)
#endif
/********************* VERY LOW LEVEL UTILITIES ************************/
#if DEBUG_MALLOC || DEBUG_CLIENT
static void
-szone_sleep(void) {
+szone_sleep(void)
+{
+
if (getenv("MallocErrorSleep")) {
- malloc_printf("*** Sleeping to help debug\n");
+ _malloc_printf(ASL_LEVEL_NOTICE, "*** sleeping to help debug\n");
sleep(3600); // to help debug
}
}
#endif
-static void
-szone_error(szone_t *szone, const char *msg, const void *ptr) {
+// msg prints after fmt, ...
+static __attribute__((noinline)) void
+szone_error(szone_t *szone, const char *msg, const void *ptr, const char *fmt, ...)
+{
+ va_list ap;
+ _SIMPLE_STRING b = _simple_salloc();
+
if (szone) SZONE_UNLOCK(szone);
- if (ptr) {
- malloc_printf("*** malloc[%d]: error for object %p: %s\n", getpid(), ptr, msg);
+ if (b) {
+ if (fmt) {
+ va_start(ap, fmt);
+ _simple_vsprintf(b, fmt, ap);
+ va_end(ap);
+ }
+ if (ptr) {
+ _simple_sprintf(b, "*** error for object %p: %s\n", ptr, msg);
+ } else {
+ _simple_sprintf(b, "*** error: %s\n", msg);
+ }
+ malloc_printf("%s*** set a breakpoint in malloc_error_break to debug\n", _simple_string(b));
+ _simple_sfree(b);
} else {
- malloc_printf("*** malloc[%d]: error: %s\n", getpid(), msg);
- }
+ /*
+ * Should only get here if vm_allocate() can't get a single page of
+ * memory, implying _simple_asl_log() would also fail. So we just
+ * print to the file descriptor.
+ */
+ if (fmt) {
+ va_start(ap, fmt);
+ _malloc_vprintf(MALLOC_PRINTF_NOLOG, fmt, ap);
+ va_end(ap);
+ }
+ if (ptr) {
+ _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error for object %p: %s\n", ptr, msg);
+ } else {
+ _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error: %s\n", msg);
+ }
+ _malloc_printf(MALLOC_PRINTF_NOLOG, "*** set a breakpoint in malloc_error_break to debug\n");
+ }
+ malloc_error_break();
#if DEBUG_MALLOC
szone_print(szone, 1);
szone_sleep();
@@ -287,126 +614,170 @@
#if DEBUG_CLIENT
szone_sleep();
#endif
+ if (szone->debug_flags & SCALABLE_MALLOC_ABORT_ON_ERROR) abort();
}
static void
-protect(szone_t *szone, vm_address_t address, vm_size_t size,
- unsigned protection, unsigned debug_flags) {
+protect(void *address, size_t size, unsigned protection, unsigned debug_flags)
+{
kern_return_t err;
+
if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_PRELUDE)) {
- err = vm_protect(mach_task_self(), address - (1 << vm_page_shift), 1 << vm_page_shift,
- 0, protection);
+ err = vm_protect(mach_task_self(), (vm_address_t)(uintptr_t)address - vm_page_size, vm_page_size, 0, protection);
if (err) {
- malloc_printf("*** malloc[%d]: Can't protect(%p) region for "
- "prelude guard page at %p\n", getpid(), protection,
- address - (1 << vm_page_shift));
+ malloc_printf("*** can't protect(%p) region for prelude guard page at %p\n",
+ protection,address - (1 << vm_page_shift));
}
}
if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE)) {
- err = vm_protect(mach_task_self(), (vm_address_t)(address + size), 1 << vm_page_shift, 0, protection);
+ err = vm_protect(mach_task_self(), (vm_address_t)(uintptr_t)address + size, vm_page_size, 0, protection);
if (err) {
- malloc_printf("*** malloc[%d]: Can't protect(%p) region for "
- "postlude guard page at %p\n", getpid(), protection,
- address + size);
- }
- }
-}
-
-static vm_address_t
-allocate_pages(szone_t *szone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label) {
+ malloc_printf("*** can't protect(%p) region for postlude guard page at %p\n",
+ protection, address + size);
+ }
+ }
+}
+
+static void *
+allocate_pages(szone_t *szone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label)
+{
// align specifies a desired alignment (as a log) or 0 if no alignment requested
- kern_return_t err;
- vm_address_t addr;
+ void *vm_addr;
+ uintptr_t addr, aligned_address;
boolean_t add_guard_pages = debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES;
size_t allocation_size = round_page(size);
+ size_t delta;
+
if (align) add_guard_pages = 0; // too cumbersome to deal with that
if (!allocation_size) allocation_size = 1 << vm_page_shift;
if (add_guard_pages) allocation_size += 2 * (1 << vm_page_shift);
- if (align) allocation_size += 1 << align;
- err = vm_allocate(mach_task_self(), &addr, allocation_size, vm_page_label | 1);
- if (err) {
- malloc_printf("*** malloc: vm_allocate(size=%d) failed (error code=%d)\n", size, err);
- szone_error(szone, "Can't allocate region", NULL);
- return NULL;
- }
+ if (align) allocation_size += (size_t)1 << align;
+ vm_addr = mmap(0, allocation_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, VM_MAKE_TAG(vm_page_label), 0);
+ if ((uintptr_t)vm_addr == -1) {
+ szone_error(szone, "can't allocate region", NULL, "*** mmap(size=%lld) failed (error code=%d)\n", (long long)allocation_size, errno);
+ return NULL;
+ }
+ addr = (uintptr_t)vm_addr;
if (align) {
- // malloc_printf("In allocate_pages(size=%d(%p), align=%d) -> %p\n", size, size, align, addr);
- vm_address_t aligned_address = (addr + (1 << align) - 1) & ~ ((1 << align) - 1);
+ aligned_address = (addr + ((uintptr_t)1 << align) - 1) & ~ (((uintptr_t)1 << align) - 1);
if (aligned_address != addr) {
- size_t delta = aligned_address - addr;
- err = vm_deallocate(mach_task_self(), addr, delta);
- if (err) malloc_printf("*** malloc: freeing unaligned header failed with %d\n", err);
- // malloc_printf("deallocated unaligned header %p length=%d(%p)\n", addr, delta, delta);
+ delta = aligned_address - addr;
+ if (munmap((void *)addr, delta) == -1)
+ malloc_printf("*** freeing unaligned header failed with %d\n", errno);
addr = aligned_address;
allocation_size -= delta;
}
if (allocation_size > size) {
- err = vm_deallocate(mach_task_self(), addr+size, allocation_size - size);
- if (err) malloc_printf("*** malloc: freeing unaligned footer failed with %d\n", err);
+ if (munmap((void *)(addr + size), allocation_size - size) == -1)
+ malloc_printf("*** freeing unaligned footer failed with %d\n", errno);
}
}
if (add_guard_pages) {
- addr += 1 << vm_page_shift;
- protect(szone, addr, size, 0, debug_flags);
- }
- return addr;
+ addr += (uintptr_t)1 << vm_page_shift;
+ protect((void *)addr, size, 0, debug_flags);
+ }
+ return (void *)addr;
}
static void
-deallocate_pages(szone_t *szone, vm_address_t addr, size_t size, unsigned debug_flags) {
- kern_return_t err;
- boolean_t add_guard_pages = debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES;
+deallocate_pages(szone_t *szone, void *addr, size_t size, unsigned debug_flags)
+{
+ int err;
+ boolean_t add_guard_pages = debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES;
+
if (add_guard_pages) {
addr -= 1 << vm_page_shift;
size += 2 * (1 << vm_page_shift);
}
- err = vm_deallocate(mach_task_self(), addr, size);
- if (err) {
- szone_error(szone, "Can't deallocate_pages region", (void *)addr);
- }
+ err = munmap(addr, size);
+ if ((err == -1) && szone)
+ szone_error(szone, "Can't deallocate_pages region", addr, NULL);
}
static kern_return_t
-_szone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr) {
+_szone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr)
+{
*ptr = (void *)address;
return 0;
}
+/********************* FREE LIST UTILITIES ************************/
+
+// A free list entry is comprised of a pair of pointers, previous and next.
+// Because the free list entries are previously freed objects, there is a
+// non-zero chance that a misbehaved program will write to an allocated object
+// after it has called free() on the pointer. This write would then potentially
+// corrupt the previous and next pointers, leading to a crash. In order to
+// detect this case, we take advantage of the fact that pointers are known to
+// be at least 16 byte aligned, and thus have at least 4 trailing zero bits.
+// When an entry is added to the free list, the previous and next pointers are
+// shifted right by 2 bits, and then have the high and low 2 bits set, to act
+// as guard bits. Before accessing a free list object, we verify that these
+// bits are still set, and log an error if they are not.
+
static INLINE void
-free_list_checksum(szone_t *szone, free_list_t *ptr, const char *msg) {
- // We always checksum, as testing whether to do it (based on szone->debug_flags) is as fast as doing it
- if (ptr->checksum != (((unsigned)ptr->previous) ^ ((unsigned)ptr->next) ^ CHECKSUM_MAGIC)) {
-#if DEBUG_MALLOC
- malloc_printf("*** Incorrect checksum: %s\n", msg);
-#endif
- szone_error(szone, "Incorrect checksum for freed object - object was probably modified after being freed; break at szone_error", ptr);
- }
+free_list_checksum(szone_t *szone, free_list_t *ptr, const char *msg)
+{
+ uintptr_t ptrs = ptr->previous.u & ptr->next.u;
+
+#ifdef __LP64__
+ ptrs = (ptrs << 2) | (ptrs >> (64-2));
+#else
+ ptrs = (ptrs << 2) | (ptrs >> (32-2));
+#endif
+
+ if ((ptrs & 15) != 15)
+ szone_error(szone, "incorrect checksum for freed object "
+ "- object was probably modified after being freed.", ptr, NULL);
+}
+
+static INLINE uintptr_t
+free_list_checksum_ptr(void *p)
+{
+ ptr_union ptr;
+ ptr.p = p;
+
+#ifdef __LP64__
+ return (ptr.u >> 2) | 0xC000000000000003ULL;
+#else
+ return (ptr.u >> 2) | 0xC0000003U;
+#endif
+}
+
+static INLINE void *
+free_list_unchecksum_ptr(ptr_union ptr)
+{
+ uintptr_t u = (ptr.u >> 2) << 4;
+ return (void *)u;
}
static INLINE void
-free_list_set_checksum(szone_t *szone, free_list_t *ptr) {
- // We always set checksum, as testing whether to do it (based on
- // szone->debug_flags) is slower than just doing it
- ptr->checksum = ((unsigned)ptr->previous) ^ ((unsigned)ptr->next) ^ CHECKSUM_MAGIC;
+free_list_set_checksum(szone_t *szone, free_list_t *ptr)
+{
+ ptr->previous.u = free_list_checksum_ptr(ptr->previous.p);
+ ptr->next.u = free_list_checksum_ptr(ptr->next.p);
}
static unsigned
-free_list_count(const free_list_t *ptr) {
+free_list_count(const free_list_t *ptr)
+{
unsigned count = 0;
+
while (ptr) {
- count++;
-// malloc_printf("%p ", ptr);
- ptr = ptr->next;
+ count++;
+ ptr = free_list_unchecksum_ptr(ptr->next);
}
return count;
}
+
+/* XXX inconsistent use of BITMAP32 and BITARRAY operations could be cleaned up */
#define BITMAP32_SET(bitmap,bit) (bitmap |= 1 << (bit))
#define BITMAP32_CLR(bitmap,bit) (bitmap &= ~ (1 << (bit)))
#define BITMAP32_BIT(bitmap,bit) ((bitmap >> (bit)) & 1)
-#define BITMAP32_FFS(bitmap) (ffs(bitmap))
- // returns bit # of first bit that's one, starting at 1 (returns 0 if !bitmap)
+/* returns bit # of least-significant one bit, starting at 0 (undefined if !bitmap) */
+#define BITMAP32_CTZ(bitmap) (__builtin_ctz(bitmap))
/********************* TINY FREE LIST UTILITIES ************************/
@@ -424,352 +795,435 @@
#define BITARRAY_BIT(bits,index) (((bits[index>>3]) >> (index & 7)) & 1)
// Following is for start<8 and end<=start+32
-#define BITARRAY_MCLR_LESS_32(bits,start,end) { \
- unsigned char *_bits = (bits); \
- unsigned _end = (end); \
- switch (_end >> 3) { \
- case 4: _bits[4] &= ~ ((1 << (_end - 32)) - 1); _end = 32; \
- case 3: _bits[3] &= ~ ((1 << (_end - 24)) - 1); _end = 24; \
- case 2: _bits[2] &= ~ ((1 << (_end - 16)) - 1); _end = 16; \
- case 1: _bits[1] &= ~ ((1 << (_end - 8)) - 1); _end = 8; \
- case 0: _bits[0] &= ~ ((1 << _end) - (1 << (start))); \
- } \
-}
-
-#if 0 // Simple but slow version
-#warning Slow version in effect
-#define BITARRAY_MCLR(bits,index,num) { \
- unsigned _ctr = (num); \
- unsigned _cur = (index); \
- while (_ctr--) {BITARRAY_CLR(bits,_cur); _cur++; } \
-}
-#else
-
-// Following is for num <= 32
-#define BITARRAY_MCLR(bits,index,num) { \
- unsigned _index = (index); \
- unsigned char *_rebased = (bits) + (_index >> 3); \
- _index &= 7; \
- BITARRAY_MCLR_LESS_32(_rebased, _index, _index + (num)); \
-}
-#endif
+static void ALWAYSINLINE
+bitarray_mclr(void *bits, unsigned start, unsigned end) {
+ unsigned word = OSReadLittleInt32(bits, 0);
+ unsigned mask = (0xFFFFFFFFU >> (31 - start)) >> 1;
+
+ if (end > 31) {
+ unsigned char *bytes = (unsigned char *)bits;
+ bytes[4] &= ~((1 << (end - 32)) - 1);
+ } else {
+ mask |= (0xFFFFFFFF << end);
+ }
+ OSWriteLittleInt32(bits, 0, word & mask);
+}
+
+/*
+ * Obtain the size of a free tiny block (in msize_t units).
+ */
+static msize_t
+get_tiny_free_size(const void *ptr)
+{
+ void *next_block = (void *)((uintptr_t)ptr + TINY_QUANTUM);
+ void *region_end = TINY_REGION_END(TINY_REGION_FOR_PTR(ptr));
+
+ // check whether the next block is outside the tiny region or a block header
+ // if so, then the size of this block is one, and there is no stored size.
+ if (next_block < region_end)
+ {
+ unsigned char *next_header = TINY_BLOCK_HEADER_FOR_PTR(next_block);
+ msize_t next_index = TINY_INDEX_FOR_PTR(next_block);
+
+ if (!BITARRAY_BIT(next_header, next_index))
+ return TINY_FREE_SIZE(ptr);
+ }
+ return 1;
+}
+
+/*
+ * Get the size of the previous free block, which is stored in the last two
+ * bytes of the block. If the previous block is not free, then the result is
+ * undefined.
+ */
+static msize_t
+get_tiny_previous_free_msize(const void *ptr)
+{
+ // check whether the previous block is in the tiny region and a block header
+ // if so, then the size of the previous block is one, and there is no stored
+ // size.
+ if (ptr != TINY_REGION_FOR_PTR(ptr))
+ {
+ void *prev_block = (void *)((uintptr_t)ptr - TINY_QUANTUM);
+ unsigned char *prev_header = TINY_BLOCK_HEADER_FOR_PTR(prev_block);
+ msize_t prev_index = TINY_INDEX_FOR_PTR(prev_block);
+ if (BITARRAY_BIT(prev_header, prev_index))
+ return 1;
+ return TINY_PREVIOUS_MSIZE(ptr);
+ }
+ // don't read possibly unmapped memory before the beginning of the region
+ return 0;
+}
static INLINE msize_t
-get_tiny_meta_header(const void *ptr, boolean_t *is_free) {
+get_tiny_meta_header(const void *ptr, boolean_t *is_free)
+{
// returns msize and is_free
// may return 0 for the msize component (meaning 65536)
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
- unsigned byte_index = index >> 3;
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+ unsigned byte_index;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ index = TINY_INDEX_FOR_PTR(ptr);
+ byte_index = index >> 3;
+
block_header += byte_index;
index &= 7;
*is_free = 0;
- if (!BITMAP32_BIT(*block_header, index)) return 0;
- unsigned char *in_use = block_header + (NUM_TINY_BLOCKS >> 3) + 4;
+ if (!BITMAP32_BIT(*block_header, index))
+ return 0;
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
if (!BITMAP32_BIT(*in_use, index)) {
- *is_free = 1;
- return TINY_FREE_SIZE(ptr);
- }
-#if defined(__BIG_ENDIAN__)
- unsigned *addr = (void *)((unsigned)block_header & ~3);
- unsigned word0 = OSReadSwapInt32(addr, 0);
- unsigned word1 = OSReadSwapInt32(addr, 4);
- unsigned bits = index + (((unsigned)block_header & 3) * 8);
- unsigned word = (word0 >> bits) | (word1 << (32 - bits));
- unsigned result = ffs(word >> 1);
-#if DEBUG_MALLOC
- if (result >= 32) {
- malloc_printf("*** get_tiny_meta_header() invariant broken %p %d\n", ptr, result);
- szone_sleep();
- }
-#endif
+ *is_free = 1;
+ return get_tiny_free_size(ptr);
+ }
+ uint32_t *addr = (uint32_t *)((uintptr_t)block_header & ~3);
+ uint32_t word0 = OSReadLittleInt32(addr, 0) >> index;
+ uint32_t word1 = OSReadLittleInt32(addr, 4) << (8 - index);
+ uint32_t bits = (((uintptr_t)block_header & 3) * 8); // precision loss on LP64 OK here
+ uint32_t word = (word0 >> bits) | (word1 << (24 - bits));
+ uint32_t result = ffs(word >> 1);
return result;
-#else
- unsigned cur = index + 1;
- while (!BITARRAY_BIT(block_header, cur)) cur++; // assumes padding at the zone end
-#if DEBUG_MALLOC
- if (cur - index >= 32) {
- malloc_printf("*** get_tiny_meta_header() invariant broken %p %d %d\n", ptr, index, cur);
- szone_sleep();
- }
-#endif
- return cur - index;
-#endif
}
static INLINE void
-set_tiny_meta_header_in_use(const void *ptr, msize_t msize) {
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
-#if DEBUG_MALLOC
- if (msize >= 32) malloc_printf("*** set_tiny_meta_header_in_use() invariant broken %p %d\n", ptr, msize);
- if ((unsigned)index + (unsigned)msize > 0x10000) malloc_printf("*** set_tiny_meta_header_in_use() invariant broken (2) %p %d\n", ptr, msize);
-#endif
- unsigned byte_index = index >> 3;
+set_tiny_meta_header_in_use(const void *ptr, msize_t msize)
+{
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+ unsigned byte_index;
+ msize_t clr_msize;
+ unsigned end_bit;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ index = TINY_INDEX_FOR_PTR(ptr);
+ byte_index = index >> 3;
+
+#if DEBUG_MALLOC
+ if (msize >= 32)
+ malloc_printf("set_tiny_meta_header_in_use() invariant broken %p %d\n", ptr, msize);
+ if ((unsigned)index + (unsigned)msize > 0x10000)
+ malloc_printf("set_tiny_meta_header_in_use() invariant broken (2) %p %d\n", ptr, msize);
+#endif
block_header += byte_index;
index &= 7;
BITMAP32_SET(*block_header, index);
- unsigned char *in_use = block_header + (NUM_TINY_BLOCKS >> 3) + 4;
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
BITMAP32_SET(*in_use, index);
index++;
- msize_t clr_msize = msize-1;
+ clr_msize = msize-1;
if (clr_msize) {
byte_index = index >> 3;
block_header += byte_index; in_use += byte_index;
index &= 7;
- unsigned end_bit = index + clr_msize;
- BITARRAY_MCLR_LESS_32(block_header, index, end_bit);
- BITARRAY_MCLR_LESS_32(in_use, index, end_bit);
+ end_bit = index + clr_msize;
+ bitarray_mclr(block_header, index, end_bit);
+ bitarray_mclr(in_use, index, end_bit);
}
BITARRAY_SET(block_header, index+clr_msize); // we set the block_header bit for the following block to reaffirm next block is a block
#if DEBUG_MALLOC
- boolean_t ff;
- msize_t mf = get_tiny_meta_header(ptr, &ff);
- if (msize != mf) {
- malloc_printf("*** setting header for tiny in_use %p : %d\n", ptr, msize);
- malloc_printf("reading header for tiny %p : %d %d\n", ptr, mf, ff);
+ {
+ boolean_t ff;
+ msize_t mf;
+
+ mf = get_tiny_meta_header(ptr, &ff);
+ if (msize != mf) {
+ malloc_printf("setting header for tiny in_use %p : %d\n", ptr, msize);
+ malloc_printf("reading header for tiny %p : %d %d\n", ptr, mf, ff);
+ }
}
#endif
}
static INLINE void
-set_tiny_meta_header_middle(const void *ptr) {
+set_tiny_meta_header_middle(const void *ptr)
+{
// indicates this block is in the middle of an in use block
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- unsigned char *in_use = (unsigned char *)(headers_start + (NUM_TINY_BLOCKS >> 3) + 4);
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
- BITARRAY_CLR(block_header, index); BITARRAY_CLR(in_use, index);
- TINY_FREE_SIZE(ptr) = 0;
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
+ index = TINY_INDEX_FOR_PTR(ptr);
+
+ BITARRAY_CLR(block_header, index);
+ BITARRAY_CLR(in_use, index);
}
static INLINE void
-set_tiny_meta_header_free(const void *ptr, msize_t msize) {
+set_tiny_meta_header_free(const void *ptr, msize_t msize)
+{
// !msize is acceptable and means 65536
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- unsigned char *in_use = (unsigned char *)(headers_start + (NUM_TINY_BLOCKS >> 3) + 4);
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
+ index = TINY_INDEX_FOR_PTR(ptr);
+
#if DEBUG_MALLOC
if ((unsigned)index + (unsigned)msize > 0x10000) {
- malloc_printf("*** setting header for tiny free %p msize too large: %d\n", ptr, msize);
- }
-#endif
- BITARRAY_SET(block_header, index); BITARRAY_CLR(in_use, index);
- TINY_FREE_SIZE(ptr) = msize;
- // mark the end of this block
- if (msize) { // msize==0 => the whole region is free
- void *follower = FOLLOWING_TINY_PTR(ptr, msize);
- TINY_PREVIOUS_MSIZE(follower) = msize;
+ malloc_printf("setting header for tiny free %p msize too large: %d\n", ptr, msize);
+ }
+#endif
+ BITARRAY_SET(block_header, index);
+ BITARRAY_CLR(in_use, index);
+ // mark the end of this block if msize is > 1. For msize == 0, the whole
+ // region is free, so there is no following block. For msize == 1, there is
+ // no space to write the size on 64 bit systems. The size for 1 quantum
+ // blocks is computed from the metadata bitmaps.
+ if (msize > 1) {
+ void *follower = FOLLOWING_TINY_PTR(ptr, msize);
+ TINY_PREVIOUS_MSIZE(follower) = msize;
+ TINY_FREE_SIZE(ptr) = msize;
+ }
+ if (msize == 0) {
+ TINY_FREE_SIZE(ptr) = msize;
}
#if DEBUG_MALLOC
boolean_t ff;
msize_t mf = get_tiny_meta_header(ptr, &ff);
if ((msize != mf) || !ff) {
- malloc_printf("*** setting header for tiny free %p : %d\n", ptr, msize);
- malloc_printf("reading header for tiny %p : %d %d\n", ptr, mf, ff);
+ malloc_printf("setting header for tiny free %p : %u\n", ptr, msize);
+ malloc_printf("reading header for tiny %p : %u %u\n", ptr, mf, ff);
}
#endif
}
static INLINE boolean_t
-tiny_meta_header_is_free(const void *ptr) {
- // returns msize and is_free shifted by 16
- // may return 0 for the msize component (meaning 65536)
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- unsigned char *in_use = (unsigned char *)(headers_start + (NUM_TINY_BLOCKS >> 3) + 4);
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
- if (!BITARRAY_BIT(block_header, index)) return 0;
+tiny_meta_header_is_free(const void *ptr)
+{
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
+ index = TINY_INDEX_FOR_PTR(ptr);
+ if (!BITARRAY_BIT(block_header, index))
+ return 0;
return !BITARRAY_BIT(in_use, index);
}
static INLINE void *
-tiny_previous_preceding_free(void *ptr, msize_t *prev_msize) {
+tiny_previous_preceding_free(void *ptr, msize_t *prev_msize)
+{
// returns the previous block, assuming and verifying it's free
- unsigned short shifted_base = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << TINY_BLOCKS_ALIGN;
- unsigned char *block_header = (unsigned char *)headers_start;
- unsigned char *in_use = (unsigned char *)(headers_start + (NUM_TINY_BLOCKS >> 3) + 4);
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
- if (!index) return NULL;
- msize_t previous_msize = TINY_PREVIOUS_MSIZE(ptr);
- if (previous_msize > index) return NULL;
- msize_t previous_index = index - previous_msize;
- void *previous_ptr = (void *)((shifted_base << TINY_BLOCKS_ALIGN) + (previous_index << SHIFT_TINY_QUANTUM));
- if (TINY_FREE_SIZE(previous_ptr) != previous_msize) return NULL;
- if (!BITARRAY_BIT(block_header, previous_index)) return NULL;
- if (BITARRAY_BIT(in_use, previous_index)) return NULL;
+ unsigned char *block_header;
+ unsigned char *in_use;
+ msize_t index;
+ msize_t previous_msize;
+ msize_t previous_index;
+ void *previous_ptr;
+
+ block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
+ index = TINY_INDEX_FOR_PTR(ptr);
+
+ if (!index)
+ return NULL;
+ if ((previous_msize = get_tiny_previous_free_msize(ptr)) > index)
+ return NULL;
+
+ previous_index = index - previous_msize;
+ previous_ptr = (void *)(TINY_REGION_FOR_PTR(ptr) + TINY_BYTES_FOR_MSIZE(previous_index));
+ if (!BITARRAY_BIT(block_header, previous_index))
+ return NULL;
+ if (BITARRAY_BIT(in_use, previous_index))
+ return NULL;
+ if (get_tiny_free_size(previous_ptr) != previous_msize)
+ return NULL;
+
// conservative check did match true check
*prev_msize = previous_msize;
- // malloc_printf("tiny_previous_preceding_free(%p) -> %p,%d\n", ptr, previous_ptr, previous_msize);
return previous_ptr;
}
-static INLINE void
-tiny_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize) {
- // Adds an item to the proper free list
- // Also marks the meta-header of the block properly
- // Assumes szone has been locked
+/*
+ * Adds an item to the proper free list, and also marks the meta-header of the
+ * block properly.
+ * Assumes szone has been locked
+ */
+static void
+tiny_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize)
+{
grain_t slot = (!msize || (msize >= NUM_TINY_SLOTS)) ? NUM_TINY_SLOTS - 1 : msize - 1;
free_list_t *free_ptr = ptr;
free_list_t *free_head = szone->tiny_free_list[slot];
+
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_free_list_add_ptr(), ptr=%p, msize=%d\n", ptr, msize);
- }
- if (((unsigned)ptr) & (TINY_QUANTUM - 1)) {
- szone_error(szone, "tiny_free_list_add_ptr: Unaligned ptr", ptr);
+ malloc_printf("in %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
+ }
+ if (((uintptr_t)ptr) & (TINY_QUANTUM - 1)) {
+ szone_error(szone, "tiny_free_list_add_ptr: Unaligned ptr", ptr, NULL);
}
#endif
set_tiny_meta_header_free(ptr, msize);
if (free_head) {
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
-#if DEBUG_MALLOC
- if (free_head->previous) {
- malloc_printf("ptr=%p slot=%d free_head=%p previous=%p\n", ptr, slot, free_head, free_head->previous);
- szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr);
- }
- if (! tiny_meta_header_is_free(free_head)) {
- malloc_printf("ptr=%p slot=%d free_head=%p\n", ptr, slot, free_head);
- szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr);
- }
-#endif
- free_head->previous = free_ptr;
- free_list_set_checksum(szone, free_head);
+ free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
+#if DEBUG_MALLOC
+ if (free_list_unchecksum_ptr(free_head->previous)) {
+ szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr,
+ "ptr=%p slot=%d free_head=%p previous=%p\n", ptr, slot, free_head, free_head->previous.p);
+ }
+ if (! tiny_meta_header_is_free(free_head)) {
+ szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr,
+ "ptr=%p slot=%d free_head=%p\n", ptr, slot, free_head);
+ }
+#endif
+ free_head->previous.u = free_list_checksum_ptr(free_ptr);
} else {
- BITMAP32_SET(szone->tiny_bitmap, slot);
- }
- free_ptr->previous = NULL;
- free_ptr->next = free_head;
+ BITMAP32_SET(szone->tiny_bitmap, slot);
+ }
+ free_ptr->previous.p = NULL;
+ free_ptr->next.p = free_head;
free_list_set_checksum(szone, free_ptr);
szone->tiny_free_list[slot] = free_ptr;
- // malloc_printf("Setting head of free list for slot=%d to %p\n", slot, free_ptr);
-}
-
+}
+
+/*
+ * Removes the item pointed to by ptr in the proper free list.
+ * Assumes szone has been locked
+ */
static INLINE void
-tiny_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize) {
- // Removes item in the proper free list
- // msize could be read, but all callers have it so we pass it in
- // Assumes szone has been locked
+tiny_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize)
+{
grain_t slot = (!msize || (msize >= NUM_TINY_SLOTS)) ? NUM_TINY_SLOTS - 1 : msize - 1;
- free_list_t *free_ptr = ptr;
- free_list_t *next = free_ptr->next;
- free_list_t *previous = free_ptr->previous;
+ free_list_t *free_ptr = ptr, *next, *previous;
+ free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
+
+ next = free_list_unchecksum_ptr(free_ptr->next);
+ previous = free_list_unchecksum_ptr(free_ptr->previous);
+
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_free_list_remove_ptr(), ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
- if (!previous) {
- // The block to remove is the head of the free list
-#if DEBUG_MALLOC
- if (szone->tiny_free_list[slot] != ptr) {
- malloc_printf("ptr=%p slot=%d msize=%d szone->tiny_free_list[slot]=%p\n", ptr, slot, msize, szone->tiny_free_list[slot]);
- szone_error(szone, "tiny_free_list_remove_ptr: Internal invariant broken (szone->tiny_free_list[slot])", ptr);
- return;
- }
-#endif
- szone->tiny_free_list[slot] = next;
- if (!next) BITMAP32_CLR(szone->tiny_bitmap, slot);
+ malloc_printf("In %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
+ }
+#endif
+ if (!previous) {
+ // The block to remove is the head of the free list
+#if DEBUG_MALLOC
+ if (szone->tiny_free_list[slot] != ptr) {
+ szone_error(szone, "tiny_free_list_remove_ptr: Internal invariant broken (szone->tiny_free_list[slot])", ptr,
+ "ptr=%p slot=%d msize=%d szone->tiny_free_list[slot]=%p\n",
+ ptr, slot, msize, szone->tiny_free_list[slot]);
+ return;
+ }
+#endif
+ szone->tiny_free_list[slot] = next;
+ if (!next) BITMAP32_CLR(szone->tiny_bitmap, slot);
} else {
- previous->next = next;
- free_list_set_checksum(szone, previous);
+ // We know free_ptr is already checksummed, so we don't need to do it
+ // again.
+ previous->next = free_ptr->next;
}
if (next) {
- next->previous = previous;
- free_list_set_checksum(szone, next);
- }
-}
-
-static INLINE tiny_region_t *
-tiny_region_for_ptr_no_lock(szone_t *szone, const void *ptr) {
- tiny_region_t *region = szone->tiny_regions;
- unsigned num_regions = szone->num_tiny_regions;
- unsigned ptr_shifted = ((unsigned)ptr) >> TINY_BLOCKS_ALIGN;
- while (num_regions--) {
- tiny_region_t this = *region;
- if (ptr_shifted == this) return region;
- region++;
- }
- return NULL;
+ // We know free_ptr is already checksummed, so we don't need to do it
+ // again.
+ next->previous = free_ptr->previous;
+ }
+}
+
+/*
+ * tiny_region_for_ptr_no_lock - Returns the tiny region containing the pointer,
+ * or NULL if not found.
+ */
+static INLINE region_t *
+tiny_region_for_ptr_no_lock(szone_t *szone, const void *ptr)
+{
+ return hash_lookup_region_no_lock(szone->tiny_regions,
+ szone->num_tiny_regions_allocated,
+ TINY_REGION_FOR_PTR(ptr));
}
static INLINE void
-tiny_free_no_lock(szone_t *szone, tiny_region_t *region, void *ptr, msize_t msize) {
- size_t original_size = msize << SHIFT_TINY_QUANTUM;
+tiny_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize)
+{
+ size_t original_size = TINY_BYTES_FOR_MSIZE(msize);
void *next_block = ((char *)ptr + original_size);
+ msize_t previous_msize;
+ void *previous;
+ msize_t next_msize;
+ free_list_t *big_free_block;
+ free_list_t *after_next_block;
+ free_list_t *before_next_block;
+
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
+ malloc_printf("in tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
}
if (! msize) {
- malloc_printf("In tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- szone_error(szone, "Trying to free tiny block that is too small", ptr);
+ szone_error(szone, "trying to free tiny block that is too small", ptr,
+ "in tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
}
#endif
// We try to coalesce this block with the preceeding one
- msize_t previous_msize;
- void *previous = tiny_previous_preceding_free(ptr, &previous_msize);
+ previous = tiny_previous_preceding_free(ptr, &previous_msize);
if (previous) {
#if DEBUG_MALLOC
- if (LOG(szone, ptr) || LOG(szone,previous)) {
- malloc_printf("In tiny_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
- }
-#endif
- tiny_free_list_remove_ptr(szone, previous, previous_msize);
- ptr = previous;
- msize += previous_msize;
+ if (LOG(szone, ptr) || LOG(szone,previous)) {
+ malloc_printf("in tiny_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
+ }
+#endif
+ // clear the meta_header since this is no longer the start of a block
+ set_tiny_meta_header_middle(ptr);
+ tiny_free_list_remove_ptr(szone, previous, previous_msize);
+ ptr = previous;
+ msize += previous_msize;
}
// We try to coalesce with the next block
- if (((vm_address_t)next_block < TINY_REGION_END(*region)) && tiny_meta_header_is_free(next_block)) {
- // The next block is free, we coalesce
- msize_t next_msize = TINY_FREE_SIZE(next_block);
-#if DEBUG_MALLOC
- if (LOG(szone, ptr) || LOG(szone, next_block)) {
- malloc_printf("In tiny_free_no_lock(), for ptr=%p, msize=%d coalesced forward=%p next_msize=%d\n", ptr, msize, next_block, next_msize);
- }
-#endif
- if (next_msize >= NUM_TINY_SLOTS) {
- // we take a short cut here to avoid removing next_block from the slot 31 freelist and then adding ptr back to slot 31
- // malloc_printf("Replacing %p(msize=%d) with %p(msize=%d) in freelist\n", next_block, next_msize, ptr, msize+next_msize);
- msize += next_msize;
- free_list_t *big_free_block = (free_list_t *)next_block;
- free_list_t *after_next_block = big_free_block->next;
- free_list_t *before_next_block = big_free_block->previous;
- free_list_checksum(szone, big_free_block, __PRETTY_FUNCTION__);
- if (!before_next_block) {
- szone->tiny_free_list[NUM_TINY_SLOTS-1] = ptr;
- } else {
- before_next_block->next = ptr;
- free_list_set_checksum(szone, before_next_block);
- }
- if (after_next_block) {
- after_next_block->previous = ptr;
- free_list_set_checksum(szone, after_next_block);
- }
- ((free_list_t *)ptr)->previous = before_next_block;
- ((free_list_t *)ptr)->next = after_next_block;
- free_list_set_checksum(szone, ptr);
- set_tiny_meta_header_free(ptr, msize);
- set_tiny_meta_header_middle(big_free_block); // clear the meta_header to enable coalescing backwards
- goto tiny_free_ending;
- }
- tiny_free_list_remove_ptr(szone, next_block, next_msize);
- set_tiny_meta_header_middle(next_block); // clear the meta_header to enable coalescing backwards
- msize += next_msize;
- }
+ if ((next_block < TINY_REGION_END(*region)) && tiny_meta_header_is_free(next_block)) {
+ next_msize = get_tiny_free_size(next_block);
+#if DEBUG_MALLOC
+ if (LOG(szone, ptr) || LOG(szone, next_block)) {
+ malloc_printf("in tiny_free_no_lock(), for ptr=%p, msize=%d coalesced forward=%p next_msize=%d\n",
+ ptr, msize, next_block, next_msize);
+ }
+#endif
+ // If we are coalescing with the next block, and the next block is in
+ // the last slot of the free list, then we optimize this case here to
+ // avoid removing next_block from the slot 31 and then adding ptr back
+ // to slot 31.
+ if (next_msize >= NUM_TINY_SLOTS) {
+ msize += next_msize;
+ big_free_block = (free_list_t *)next_block;
+ free_list_checksum(szone, big_free_block, __PRETTY_FUNCTION__);
+ after_next_block = free_list_unchecksum_ptr(big_free_block->next);
+ before_next_block = free_list_unchecksum_ptr(big_free_block->previous);
+ if (!before_next_block) {
+ szone->tiny_free_list[NUM_TINY_SLOTS-1] = ptr;
+ } else {
+ before_next_block->next.u = free_list_checksum_ptr(ptr);
+ }
+ if (after_next_block) {
+ after_next_block->previous.u = free_list_checksum_ptr(ptr);
+ }
+ // we don't need to checksum these since they are already checksummed
+ ((free_list_t *)ptr)->previous = big_free_block->previous;
+ ((free_list_t *)ptr)->next = big_free_block->next;
+
+ // clear the meta_header to enable coalescing backwards
+ set_tiny_meta_header_middle(big_free_block);
+ set_tiny_meta_header_free(ptr, msize);
+ goto tiny_free_ending;
+ }
+ tiny_free_list_remove_ptr(szone, next_block, next_msize);
+ set_tiny_meta_header_middle(next_block); // clear the meta_header to enable coalescing backwards
+ msize += next_msize;
+ }
+#if !TINY_CACHE
+ // The tiny cache already scribbles free blocks as they go through the
+ // cache, so we do not need to do it here.
if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && msize) {
- memset(ptr, 0x55, msize << SHIFT_TINY_QUANTUM);
- }
+ memset(ptr, 0x55, TINY_BYTES_FOR_MSIZE(msize));
+ }
+#endif
tiny_free_list_add_ptr(szone, ptr, msize);
tiny_free_ending:
// When in proper debug mode we write on the memory to help debug memory smashers
@@ -777,161 +1231,245 @@
szone->num_bytes_in_tiny_objects -= original_size; // we use original_size and not msize to avoid double counting the coalesced blocks
}
+// Allocates from the last region or a freshly allocated region
static void *
-tiny_malloc_from_region_no_lock(szone_t *szone, msize_t msize) {
- // Allocates from the last region or a freshly allocated region
- // Before anything we transform the tiny_bytes_free_at_end - if any - to a regular free block
+tiny_malloc_from_region_no_lock(szone_t *szone, msize_t msize)
+{
+ void *last_block, *ptr, *aligned_address;
+ unsigned char *last_header;
+ msize_t last_msize, last_index;
+
+ // Before anything we transform any remaining tiny_bytes_free_at_end into a
+ // regular free block. We take special care here to update the bitfield
+ // information, since we are bypassing the normal free codepath. If there
+ // is more than one quanta worth of memory in tiny_bytes_free_at_end, then
+ // there will be two block headers:
+ // 1) header for the free space at end, msize = 1
+ // 2) header inserted by set_tiny_meta_header_in_use after block
+ // We must clear the second one so that when the free block's size is
+ // queried, we do not think the block is only 1 quantum in size because
+ // of the second set header bit.
if (szone->tiny_bytes_free_at_end) {
- tiny_region_t last_region = szone-> tiny_regions[szone->num_tiny_regions-1];
- void *last_block = (void *)(TINY_REGION_END(last_region) - szone->tiny_bytes_free_at_end);
- tiny_free_list_add_ptr(szone, last_block, szone->tiny_bytes_free_at_end >> SHIFT_TINY_QUANTUM);
- szone->tiny_bytes_free_at_end = 0;
- }
- void *ptr;
+ last_block = TINY_REGION_END(szone->last_tiny_region) - szone->tiny_bytes_free_at_end;
+ last_msize = TINY_MSIZE_FOR_BYTES(szone->tiny_bytes_free_at_end);
+ last_header = TINY_BLOCK_HEADER_FOR_PTR(last_block);
+ last_index = TINY_INDEX_FOR_PTR(last_block);
+
+ if (last_index != (NUM_TINY_BLOCKS - 1))
+ BITARRAY_CLR(last_header, last_index + 1);
+
+ tiny_free_list_add_ptr(szone, last_block, last_msize);
+ szone->tiny_bytes_free_at_end = 0;
+ }
// time to create a new region
- vm_address_t aligned_address = allocate_pages(szone, TINY_REGION_SIZE, TINY_BLOCKS_ALIGN, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC_TINY));
- if (! aligned_address) {
- // out of memory!
- return NULL;
- }
- // malloc_printf("Allocated tiny region #%d: %p [%y]\n", szone->num_tiny_regions, aligned_address, TINY_REGION_SIZE);
+ aligned_address = allocate_pages(szone, TINY_REGION_SIZE, TINY_BLOCKS_ALIGN, 0, VM_MEMORY_MALLOC_TINY);
+ if (!aligned_address) // out of memory!
+ return NULL;
// We set the padding after block_header to be all 1
- ((unsigned *)(aligned_address + (1 << TINY_BLOCKS_ALIGN) + (NUM_TINY_BLOCKS >> 3)))[0] = ~0;
- if (szone->num_tiny_regions == INITIAL_NUM_TINY_REGIONS) {
- tiny_region_t *new_regions;
- // malloc_printf("=== Growing tiny_regions (%d regions)\n", szone->num_tiny_regions);
- new_regions = small_malloc_from_region_no_lock(szone, 16); // 16 * 512 bytes is plenty of tiny regions (more than 4,000)
- if (!new_regions) return NULL;
- memcpy(new_regions, szone->tiny_regions, INITIAL_NUM_TINY_REGIONS * sizeof(tiny_region_t));
- szone->tiny_regions = new_regions; // we set the pointer after it's all ready to enable enumeration from another thread without locking
- }
- szone->tiny_regions[szone->num_tiny_regions] = aligned_address >> TINY_BLOCKS_ALIGN;
- szone->num_tiny_regions ++; // we set the number after the pointer is all ready to enable enumeration from another thread without taking the lock
- ptr = (void *)aligned_address;
+ ((uint32_t *)(aligned_address + TINY_HEADER_START + (NUM_TINY_BLOCKS >> 3)))[0] = ~0;
+
+ // Check to see if the hash ring of tiny regions needs to grow. Try to
+ // avoid the hash ring becoming too dense.
+ if (szone->num_tiny_regions_allocated < (2 * szone->num_tiny_regions)) {
+ region_t *new_regions;
+ size_t new_size;
+ new_regions = hash_regions_grow_no_lock(szone, szone->tiny_regions,
+ szone->num_tiny_regions_allocated,
+ &new_size);
+ // Do not deallocate the current tiny_regions allocation since someone may
+ // be iterating it. Instead, just leak it.
+ szone->tiny_regions = new_regions;
+ szone->num_tiny_regions_allocated = new_size;
+ }
+ // Insert the new region into the hash ring, and update malloc statistics
+ hash_region_insert_no_lock(szone->tiny_regions,
+ szone->num_tiny_regions_allocated,
+ aligned_address);
+ szone->last_tiny_region = aligned_address;
+
+ szone->num_tiny_regions++;
+ ptr = aligned_address;
set_tiny_meta_header_in_use(ptr, msize);
szone->num_tiny_objects++;
- szone->num_bytes_in_tiny_objects += msize << SHIFT_TINY_QUANTUM;
+ szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(msize);
+
// We put a header on the last block so that it appears in use (for coalescing, etc...)
- set_tiny_meta_header_in_use(ptr + (msize << SHIFT_TINY_QUANTUM), 1);
- szone->tiny_bytes_free_at_end = (NUM_TINY_BLOCKS - msize) << SHIFT_TINY_QUANTUM;
+ set_tiny_meta_header_in_use(ptr + TINY_BYTES_FOR_MSIZE(msize), 1);
+ szone->tiny_bytes_free_at_end = TINY_BYTES_FOR_MSIZE(NUM_TINY_BLOCKS - msize);
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_region_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
+ malloc_printf("in tiny_malloc_from_region_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
}
#endif
return ptr;
}
static INLINE boolean_t
-try_realloc_tiny_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) {
+try_realloc_tiny_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
+{
// returns 1 on success
- msize_t index = (((unsigned)ptr) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_BLOCKS - 1);
- msize_t old_msize = old_size >> SHIFT_TINY_QUANTUM;
- unsigned next_index = index + old_msize;
- // malloc_printf("try_realloc_tiny_in_place %p %d %d\n", ptr, old_size, new_size);
+ msize_t index;
+ msize_t old_msize;
+ unsigned next_index;
+ void *next_block;
+ boolean_t is_free;
+ msize_t next_msize, coalesced_msize, leftover_msize;
+ void *leftover;
+
+ index = TINY_INDEX_FOR_PTR(ptr);
+ old_msize = TINY_MSIZE_FOR_BYTES(old_size);
+ next_index = index + old_msize;
+
if (next_index >= NUM_TINY_BLOCKS) {
- // malloc_printf("try_realloc_tiny_in_place can't take place at end %p %d %d %d\n", ptr, old_size, new_size, next_index);
return 0;
}
- void *next_block = (char *)ptr + old_size;
+ next_block = (char *)ptr + old_size;
SZONE_LOCK(szone);
- boolean_t is_free = tiny_meta_header_is_free(next_block);
+ is_free = tiny_meta_header_is_free(next_block);
if (!is_free) {
SZONE_UNLOCK(szone);
return 0; // next_block is in use;
}
- msize_t next_msize = TINY_FREE_SIZE(next_block);
- if (old_size + (next_msize >> SHIFT_TINY_QUANTUM) < new_size) {
- // malloc_printf("try_realloc_tiny_in_place can't %p too small %d\n", next_block, next_msize);
+ next_msize = get_tiny_free_size(next_block);
+ if (old_size + TINY_MSIZE_FOR_BYTES(next_msize) < new_size) {
SZONE_UNLOCK(szone);
return 0; // even with next block, not enough
}
tiny_free_list_remove_ptr(szone, next_block, next_msize);
set_tiny_meta_header_middle(next_block); // clear the meta_header to enable coalescing backwards
- msize_t coalesced_msize = (new_size - old_size + TINY_QUANTUM - 1) >> SHIFT_TINY_QUANTUM;
- msize_t leftover_msize = next_msize - coalesced_msize;
- // malloc_printf("Realloc in place for %p; current size=%d next_msize=%d wanted=%d\n", ptr, old_size, next_msize, new_size);
+ coalesced_msize = TINY_MSIZE_FOR_BYTES(new_size - old_size + TINY_QUANTUM - 1);
+ leftover_msize = next_msize - coalesced_msize;
if (leftover_msize) {
- void *leftover = next_block + (coalesced_msize << SHIFT_TINY_QUANTUM);
- // malloc_printf("Leftover in realloc in place %p leftover_msize=%d\n", leftover, leftover_msize);
+ leftover = next_block + TINY_BYTES_FOR_MSIZE(coalesced_msize);
tiny_free_list_add_ptr(szone, leftover, leftover_msize);
}
set_tiny_meta_header_in_use(ptr, old_msize + coalesced_msize);
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In try_realloc_tiny_in_place(), ptr=%p, msize=%d\n", ptr, old_msize + coalesced_msize);
- }
-#endif
- szone->num_bytes_in_tiny_objects += coalesced_msize << SHIFT_TINY_QUANTUM;
+ malloc_printf("in try_realloc_tiny_in_place(), ptr=%p, msize=%d\n", ptr, old_msize + coalesced_msize);
+ }
+#endif
+ szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(coalesced_msize);
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
- // malloc_printf("Extended ptr %p for realloc old=%d desired=%d new=%d leftover=%d\n", ptr, (unsigned)old_size, (unsigned)new_size, (unsigned)szone_size(szone, ptr), leftover_msize << SHIFT_TINY_QUANTUM);
return 1;
}
static boolean_t
-szone_check_tiny_region(szone_t *szone, tiny_region_t *region) {
- vm_address_t start = TINY_REGION_ADDRESS(*region);
- void *ptr = (void *)start;
- vm_address_t region_end = TINY_REGION_END(*region);
- boolean_t prev_free = 0;
- if (region == szone->tiny_regions + szone->num_tiny_regions - 1) region_end -= szone->tiny_bytes_free_at_end;
- // malloc_printf("szone_check_tiny_region: szone=%p region=%p start=%p ptr=%p region_end=%p\n", szone, region, start, ptr, region_end);
- while ((vm_address_t)ptr < region_end) {
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header(ptr, &is_free);
- if (is_free && !msize && (ptr == (void *)start)) {
- // the entire region is free
+tiny_check_region(szone_t *szone, region_t region)
+{
+ uintptr_t start, ptr, region_end;
+ boolean_t prev_free = 0;
+ boolean_t is_free;
+ msize_t msize;
+ free_list_t *free_head;
+ void *follower, *previous, *next;
+
+ /* establish region limits */
+ start = (uintptr_t)TINY_REGION_ADDRESS(region);
+ ptr = start;
+ region_end = (uintptr_t)TINY_REGION_END(region);
+
+ /*
+ * The last region may have a trailing chunk which has not been converted into inuse/freelist
+ * blocks yet.
+ */
+ if (region == szone->last_tiny_region)
+ region_end -= szone->tiny_bytes_free_at_end;
+
+
+ /*
+ * Scan blocks within the region.
+ */
+ while (ptr < region_end) {
+ /*
+ * If the first block is free, and its size is 65536 (msize = 0) then the entire region is
+ * free.
+ */
+ msize = get_tiny_meta_header((void *)ptr, &is_free);
+ if (is_free && !msize && (ptr == start)) {
return 1;
}
- // malloc_printf("tiny %p [%d %d]\n", ptr, msize, is_free);
- if (! msize) {
- malloc_printf("*** malloc[%d]: invariant broken for tiny block %p this msize=%d - size is too small\n", getpid(), ptr, msize);
+
+ /*
+ * If the block's size is 65536 (msize = 0) then since we're not the first entry the size is
+ * corrupt.
+ */
+ if (!msize) {
+ malloc_printf("*** invariant broken for tiny block %p this msize=%d - size is too small\n",
+ ptr, msize);
return 0;
}
+
if (!is_free) {
- // this block is in use
+ /*
+ * In use blocks cannot be more than 31 quanta large.
+ */
prev_free = 0;
- if (msize > 31*TINY_QUANTUM) {
- malloc_printf("*** malloc[%d]: invariant broken for %p this tiny msize=%d[%p] - size is too large\n", getpid(), ptr, msize, msize);
+ if (msize > 31 * TINY_QUANTUM) {
+ malloc_printf("*** invariant broken for %p this tiny msize=%d[%p] - size is too large\n",
+ ptr, msize, msize);
return 0;
}
- ptr += msize << SHIFT_TINY_QUANTUM;
+ /* move to next block */
+ ptr += TINY_BYTES_FOR_MSIZE(msize);
} else {
- // free pointer
+ /*
+ * Free blocks must have been coalesced, we cannot have a free block following another
+ * free block.
+ */
if (prev_free) {
- malloc_printf("*** malloc[%d]: invariant broken for free block %p this tiny msize=%d: two free blocks in a row\n", getpid(), ptr, msize);
+ malloc_printf("*** invariant broken for free block %p this tiny msize=%d: two free blocks in a row\n",
+ ptr, msize);
return 0;
}
prev_free = 1;
- free_list_t *free_head = ptr;
+ /*
+ * Check the integrity of this block's entry in its freelist.
+ */
+ free_head = (free_list_t *)ptr;
free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
- if (free_head->previous && !tiny_meta_header_is_free(free_head->previous)) {
- malloc_printf("*** malloc[%d]: invariant broken for %p (previous %p is not a free pointer)\n", getpid(), ptr, free_head->previous);
+ previous = free_list_unchecksum_ptr(free_head->previous);
+ next = free_list_unchecksum_ptr(free_head->next);
+ if (previous && !tiny_meta_header_is_free(previous)) {
+ malloc_printf("*** invariant broken for %p (previous %p is not a free pointer)\n",
+ ptr, previous);
return 0;
}
- if (free_head->next && !tiny_meta_header_is_free(free_head->next)) {
- malloc_printf("*** malloc[%d]: invariant broken for %p (next in free list %p is not a free pointer)\n", getpid(), ptr, free_head->next);
+ if (next && !tiny_meta_header_is_free(next)) {
+ malloc_printf("*** invariant broken for %p (next in free list %p is not a free pointer)\n",
+ ptr, next);
return 0;
}
- void *follower = FOLLOWING_TINY_PTR(ptr, msize);
- if ((follower != (void *)region_end) && (TINY_PREVIOUS_MSIZE(follower) != msize)) {
- malloc_printf("*** malloc[%d]: invariant broken for tiny free %p followed by %p in region [%p-%p] (end marker incorrect) should be %d; in fact %d\n", getpid(), ptr, follower, TINY_REGION_ADDRESS(*region), region_end, msize, TINY_PREVIOUS_MSIZE(follower));
+ /*
+ * Check the free block's trailing size value.
+ */
+ follower = FOLLOWING_TINY_PTR(ptr, msize);
+ if (((uintptr_t)follower != region_end) && (get_tiny_previous_free_msize(follower) != msize)) {
+ malloc_printf("*** invariant broken for tiny free %p followed by %p in region [%p-%p] "
+ "(end marker incorrect) should be %d; in fact %d\n",
+ ptr, follower, TINY_REGION_ADDRESS(region), region_end, msize, get_tiny_previous_free_msize(follower));
return 0;
}
- ptr = follower;
- }
- }
- if (ptr != (void *)region_end) {
- malloc_printf("*** malloc[%d]: invariant broken for region end %p - %p\n", getpid(), ptr, region_end);
+ /* move to next block */
+ ptr = (uintptr_t)follower;
+ }
+ }
+ /*
+ * Ensure that we scanned the entire region
+ */
+ if (ptr != region_end) {
+ malloc_printf("*** invariant broken for region end %p - %p\n", ptr, region_end);
return 0;
}
- if (region == szone->tiny_regions + szone->num_tiny_regions - 1) {
+ /*
+ * Check the trailing block's integrity.
+ */
+ if (region == szone->last_tiny_region) {
if (szone->tiny_bytes_free_at_end) {
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header(ptr, &is_free);
+ msize = get_tiny_meta_header((void *)ptr, &is_free);
if (is_free || (msize != 1)) {
- malloc_printf("*** malloc[%d]: invariant broken for blocker block %p - %d %d\n", getpid(), ptr, msize, is_free);
+ malloc_printf("*** invariant broken for blocker block %p - %d %d\n", ptr, msize, is_free);
}
}
}
@@ -939,197 +1477,260 @@
}
static kern_return_t
-tiny_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t region_address, unsigned short num_regions, size_t tiny_bytes_free_at_end, memory_reader_t reader, vm_range_recorder_t recorder) {
- tiny_region_t *regions;
- unsigned index = 0;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- unsigned count = 0;
- kern_return_t err;
- err = reader(task, region_address, sizeof(tiny_region_t) * num_regions, (void **)®ions);
- if (err) return err;
- while (index < num_regions) {
- // unsigned num_in_use = 0;
- // unsigned num_free = 0;
- tiny_region_t region = regions[index];
- vm_range_t range = {TINY_REGION_ADDRESS(region), TINY_REGION_SIZE};
- // malloc_printf("Enumerating tiny ptrs for tiny region starting at %p\n", range.address);
- if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
- vm_range_t admin_range = {range.address + (1 << TINY_BLOCKS_ALIGN), range.size - (1 << TINY_BLOCKS_ALIGN)};
- recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
- }
- if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
- vm_range_t ptr_range = {range.address, 1 << TINY_BLOCKS_ALIGN};
- recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
- }
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- unsigned char *mapped_region;
- err = reader(task, range.address, range.size, (void **)&mapped_region);
- if (err) return err;
- unsigned char *block_header = (unsigned char *)(mapped_region + (1 << TINY_BLOCKS_ALIGN));
- unsigned char *in_use = block_header + (NUM_TINY_BLOCKS >> 3) + 4;
- unsigned block_index = 0;
- unsigned block_limit = NUM_TINY_BLOCKS;
- if (index == num_regions - 1)
- block_limit -= (tiny_bytes_free_at_end >> SHIFT_TINY_QUANTUM);
- while (block_index < block_limit) {
- boolean_t is_free = ! BITARRAY_BIT(in_use, block_index);
- msize_t msize;
- if (is_free) {
- void *mapped_ptr = mapped_region + (block_index << SHIFT_TINY_QUANTUM);
- msize = TINY_FREE_SIZE(mapped_ptr);
- // printf("free: index=%x mapped=%p true_addr=%p msize=%d\n", block_index, mapped_ptr, (void *)range.address + (block_index << SHIFT_TINY_QUANTUM), msize);
- // num_free++;
- if (!msize) break;
- } else {
- msize = 1;
- unsigned bit = block_index + 1;
- while (! BITARRAY_BIT(block_header, bit)) { bit++; msize ++; }
- // printf("in_use: index=%x true_addr=%p msize=%d\n", block_index, (void *)range.address + (block_index << SHIFT_TINY_QUANTUM), msize);
- // num_in_use++;
- buffer[count].address = range.address + (block_index << SHIFT_TINY_QUANTUM);
- buffer[count].size = msize << SHIFT_TINY_QUANTUM;
- count++;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
- }
- block_index += msize;
- }
- }
- // malloc_printf("Found in tiny region %d in_use and %d free\n", num_in_use, num_free);
- index++;
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- }
- return 0;
-}
-
-static INLINE void *
-tiny_malloc_from_free_list(szone_t *szone, msize_t msize) {
+tiny_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder)
+{
+ size_t num_regions = szone->num_tiny_regions_allocated;
+ void *last_tiny_free = szone->last_tiny_free;
+ size_t index;
+ region_t *regions;
+ vm_range_t buffer[MAX_RECORDER_BUFFER];
+ unsigned count = 0;
+ kern_return_t err;
+ region_t region;
+ vm_range_t range;
+ vm_range_t admin_range;
+ vm_range_t ptr_range;
+ unsigned char *mapped_region;
+ unsigned char *block_header;
+ unsigned char *in_use;
+ unsigned block_index;
+ unsigned block_limit;
+ boolean_t is_free;
+ msize_t msize;
+ void *mapped_ptr;
+ unsigned bit;
+ vm_address_t last_tiny_free_ptr = 0;
+ msize_t last_tiny_free_msize = 0;
+
+ if (last_tiny_free) {
+ last_tiny_free_ptr = (uintptr_t) last_tiny_free & ~(TINY_QUANTUM - 1);
+ last_tiny_free_msize = (uintptr_t) last_tiny_free & (TINY_QUANTUM - 1);
+ }
+
+ err = reader(task, (vm_address_t)szone->tiny_regions, sizeof(region_t) * num_regions, (void **)®ions);
+ if (err) return err;
+ for (index = 0; index < num_regions; ++index) {
+ region = regions[index];
+ if (region) {
+ range.address = (vm_address_t)TINY_REGION_ADDRESS(region);
+ range.size = (vm_size_t)TINY_REGION_SIZE;
+ if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
+ admin_range.address = range.address + TINY_HEADER_START;
+ admin_range.size = TINY_HEADER_SIZE;
+ recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
+ }
+ if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
+ ptr_range.address = range.address;
+ ptr_range.size = NUM_TINY_BLOCKS * TINY_QUANTUM;
+ recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
+ }
+ if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
+ err = reader(task, range.address, range.size, (void **)&mapped_region);
+ if (err)
+ return err;
+
+ block_header = (unsigned char *)(mapped_region + TINY_HEADER_START);
+ in_use = TINY_INUSE_FOR_HEADER(block_header);
+ block_index = 0;
+ block_limit = NUM_TINY_BLOCKS;
+ if (region == szone->last_tiny_region)
+ block_limit -= TINY_MSIZE_FOR_BYTES(szone->tiny_bytes_free_at_end);
+
+ while (block_index < block_limit) {
+ vm_size_t block_offset = TINY_BYTES_FOR_MSIZE(block_index);
+ is_free = !BITARRAY_BIT(in_use, block_index);
+ if (is_free) {
+ mapped_ptr = mapped_region + block_offset;
+
+ // mapped_region, the address at which 'range' in 'task' has been
+ // mapped into our process, is not necessarily aligned to
+ // TINY_BLOCKS_ALIGN.
+ //
+ // Since the code in get_tiny_free_size() assumes the pointer came
+ // from a properly aligned tiny region, and mapped_region is not
+ // necessarily aligned, then do the size calculation directly.
+ // If the next bit is set in the header bitmap, then the size is one
+ // quantum. Otherwise, read the size field.
+ if (!BITARRAY_BIT(block_header, block_index+1))
+ msize = TINY_FREE_SIZE(mapped_ptr);
+ else
+ msize = 1;
+
+ if (!msize)
+ break;
+ } else if (range.address + block_offset != last_tiny_free_ptr) {
+ msize = 1;
+ bit = block_index + 1;
+ while (! BITARRAY_BIT(block_header, bit)) {
+ bit++;
+ msize ++;
+ }
+ buffer[count].address = range.address + block_offset;
+ buffer[count].size = TINY_BYTES_FOR_MSIZE(msize);
+ count++;
+ if (count >= MAX_RECORDER_BUFFER) {
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
+ count = 0;
+ }
+ } else {
+ // Block is not free but it matches last_tiny_free_ptr so even
+ // though it is not marked free in the bitmap, we treat it as if
+ // it is and move on
+ msize = last_tiny_free_msize;
+ }
+ block_index += msize;
+ }
+ }
+ }
+ }
+ if (count) {
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
+ }
+ return 0;
+}
+
+static void *
+tiny_malloc_from_free_list(szone_t *szone, msize_t msize)
+{
// Assumes we've locked the region
- void *ptr;
- msize_t this_msize;
- grain_t slot = msize-1;
- free_list_t **free_list = szone->tiny_free_list;
- free_list_t **the_slot = free_list + slot;
+ free_list_t *ptr;
+ msize_t this_msize;
+ grain_t slot = msize - 1;
+ free_list_t **free_list = szone->tiny_free_list;
+ free_list_t **the_slot = free_list + slot;
+ free_list_t *next;
+ free_list_t **limit;
+ unsigned bitmap;
+ msize_t leftover_msize;
+ free_list_t *leftover_ptr;
+
+ // Assumes locked
+ CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
+
+ // Look for an exact match by checking the freelist for this msize.
+ //
ptr = *the_slot;
if (ptr) {
- free_list_t *next;
- next = ((free_list_t *)ptr)->next;
- if (next) {
- next->previous = NULL;
- free_list_set_checksum(szone, next);
- }
- *the_slot = next;
- this_msize = msize;
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), exact match ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- goto return_tiny_alloc;
- }
- // adjust slot based on bitmap
- unsigned bitmap = szone->tiny_bitmap & ~ ((1 << slot) - 1);
- if (! bitmap) goto try_tiny_malloc_from_end;
- slot = BITMAP32_FFS(bitmap) - 1;
- free_list_t **limit = free_list + NUM_TINY_SLOTS - 1;
+ next = free_list_unchecksum_ptr(ptr->next);
+ if (next) {
+ next->previous = ptr->previous;
+ } else {
+ BITMAP32_CLR(szone->tiny_bitmap, slot);
+ }
+ *the_slot = next;
+ this_msize = msize;
+#if DEBUG_MALLOC
+ if (LOG(szone, ptr)) {
+ malloc_printf("in tiny_malloc_from_free_list(), exact match ptr=%p, this_msize=%d\n", ptr, this_msize);
+ }
+#endif
+ goto return_tiny_alloc;
+ }
+
+ // Mask off the bits representing slots holding free blocks smaller than the
+ // size we need. If there are no larger free blocks, try allocating from
+ // the free space at the end of the tiny region.
+ bitmap = szone->tiny_bitmap & ~ ((1 << slot) - 1);
+ if (!bitmap)
+ goto try_tiny_malloc_from_end;
+
+ slot = BITMAP32_CTZ(bitmap);
+ limit = free_list + NUM_TINY_SLOTS - 1;
free_list += slot;
+
+ // Iterate over freelists looking for free blocks, starting at first list
+ // which is not empty, and contains blocks which are large enough to satisfy
+ // our request.
while (free_list < limit) {
- // try bigger grains
- ptr = *free_list;
- if (ptr) {
- free_list_t *next;
- next = ((free_list_t *)ptr)->next;
- if (next) {
- next->previous = NULL;
- free_list_set_checksum(szone, next);
- }
- *free_list = next;
- this_msize = TINY_FREE_SIZE(ptr);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), bigger grain ptr=%p, msize=%d this_msize=%d\n", ptr, msize, this_msize);
- }
-#endif
- goto add_leftover_and_proceed;
- }
- free_list++;
- }
- // we are now looking at the last slot (31)
+ ptr = *free_list;
+ if (ptr) {
+ next = free_list_unchecksum_ptr(ptr->next);
+ *free_list = next;
+ this_msize = get_tiny_free_size(ptr);
+ if (next) {
+ next->previous = ptr->previous;
+ } else {
+ BITMAP32_CLR(szone->tiny_bitmap, this_msize - 1);
+ }
+ goto add_leftover_and_proceed;
+ }
+ free_list++;
+ }
+
+ // We are now looking at the last slot, which contains blocks equal to, or
+ // due to coalescing of free blocks, larger than 31 * tiny quantum size.
+ // If the last freelist is not empty, and the head contains a block that is
+ // larger than our request, then the remainder is put back on the free list.
ptr = *limit;
if (ptr) {
- free_list_t *next;
- this_msize = TINY_FREE_SIZE(ptr);
- next = ((free_list_t *)ptr)->next;
- if (this_msize - msize >= NUM_TINY_SLOTS) {
- // the leftover will go back to the free list, so we optimize by modifying the free list rather than removing the head and then adding back
- // malloc_printf("Allocation from largest tiny slot %p optimized\n", ptr);
- msize_t leftover_msize = this_msize - msize;
- void *leftover_ptr = ptr + (msize << SHIFT_TINY_QUANTUM);
- *limit = leftover_ptr;
- if (next) {
- next->previous = leftover_ptr;
- free_list_set_checksum(szone, next);
- }
- ((free_list_t *)leftover_ptr)->next = next;
- ((free_list_t *)leftover_ptr)->previous = NULL;
- free_list_set_checksum(szone, leftover_ptr);
- set_tiny_meta_header_free(leftover_ptr, leftover_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), last slot ptr=%p, msize=%d this_msize=%d\n", ptr, msize, this_msize);
- }
-#endif
- this_msize = msize;
- goto return_tiny_alloc;
- }
- *limit = next;
- if (next) {
- next->previous = NULL;
- free_list_set_checksum(szone, next);
- }
- goto add_leftover_and_proceed;
- }
+ free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
+ this_msize = get_tiny_free_size(ptr);
+ next = free_list_unchecksum_ptr(ptr->next);
+ if (this_msize - msize >= NUM_TINY_SLOTS) {
+ // the leftover will go back to the free list, so we optimize by
+ // modifying the free list rather than a pop and push of the head
+ leftover_msize = this_msize - msize;
+ leftover_ptr = (free_list_t *)((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize));
+ *limit = leftover_ptr;
+ if (next) {
+ next->previous.u = free_list_checksum_ptr(leftover_ptr);
+ }
+ leftover_ptr->previous = ptr->previous;
+ leftover_ptr->next = ptr->next;
+ set_tiny_meta_header_free(leftover_ptr, leftover_msize);
+#if DEBUG_MALLOC
+ if (LOG(szone,ptr)) {
+ malloc_printf("in tiny_malloc_from_free_list(), last slot ptr=%p, msize=%d this_msize=%d\n", ptr, msize, this_msize);
+ }
+#endif
+ this_msize = msize;
+ goto return_tiny_alloc;
+ }
+ if (next) {
+ next->previous = ptr->previous;
+ }
+ *limit = next;
+ goto add_leftover_and_proceed;
+ }
+
try_tiny_malloc_from_end:
// Let's see if we can use szone->tiny_bytes_free_at_end
- if (szone->tiny_bytes_free_at_end >= (msize << SHIFT_TINY_QUANTUM)) {
- ptr = (void *)(TINY_REGION_END(szone->tiny_regions[szone->num_tiny_regions-1]) - szone->tiny_bytes_free_at_end);
- szone->tiny_bytes_free_at_end -= msize << SHIFT_TINY_QUANTUM;
- if (szone->tiny_bytes_free_at_end) {
- // let's add an in use block after ptr to serve as boundary
- set_tiny_meta_header_in_use(ptr + (msize << SHIFT_TINY_QUANTUM), 1);
- }
- this_msize = msize;
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), from end ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- goto return_tiny_alloc;
+ if (szone->tiny_bytes_free_at_end >= TINY_BYTES_FOR_MSIZE(msize)) {
+ ptr = (free_list_t *)(TINY_REGION_END(szone->last_tiny_region) - szone->tiny_bytes_free_at_end);
+ szone->tiny_bytes_free_at_end -= TINY_BYTES_FOR_MSIZE(msize);
+ if (szone->tiny_bytes_free_at_end) {
+ // let's add an in use block after ptr to serve as boundary
+ set_tiny_meta_header_in_use((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize), 1);
+ }
+ this_msize = msize;
+#if DEBUG_MALLOC
+ if (LOG(szone, ptr)) {
+ malloc_printf("in tiny_malloc_from_free_list(), from end ptr=%p, msize=%d\n", ptr, msize);
+ }
+#endif
+ goto return_tiny_alloc;
}
return NULL;
+
add_leftover_and_proceed:
- // malloc_printf("For msize=%d found tiny in free_list (slot=%d) this_msize=%d\n", msize, free_list - szone->tiny_free_list, this_msize);
if (!this_msize || (this_msize > msize)) {
- msize_t leftover_msize = this_msize - msize;
- void *leftover_ptr = ptr + (msize << SHIFT_TINY_QUANTUM);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- tiny_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
- this_msize = msize;
- }
+ leftover_msize = this_msize - msize;
+ leftover_ptr = (free_list_t *)((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize));
+#if DEBUG_MALLOC
+ if (LOG(szone,ptr)) {
+ malloc_printf("in tiny_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
+ }
+#endif
+ tiny_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
+ this_msize = msize;
+ }
+
return_tiny_alloc:
szone->num_tiny_objects++;
- szone->num_bytes_in_tiny_objects += this_msize << SHIFT_TINY_QUANTUM;
+ szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(this_msize);
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
+ malloc_printf("in tiny_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
}
#endif
set_tiny_meta_header_in_use(ptr, this_msize);
@@ -1137,52 +1738,51 @@
}
static INLINE void *
-tiny_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) {
+tiny_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested)
+{
boolean_t locked = 0;
void *ptr;
-#if DEBUG_MALLOC
- if (! msize) {
- szone_error(szone, "Invariant broken (!msize) in allocation (region)", NULL);
+
+#if DEBUG_MALLOC
+ if (!msize) {
+ szone_error(szone, "invariant broken (!msize) in allocation (region)", NULL, NULL);
+ return(NULL);
}
#endif
#if TINY_CACHE
- ptr = (void *)szone->last_tiny_free;
- if ((((unsigned)ptr) & (TINY_QUANTUM - 1)) == msize) {
+ ptr = szone->last_tiny_free;
+ if ((((uintptr_t)ptr) & (TINY_QUANTUM - 1)) == msize) {
// we have a candidate - let's lock to make sure
LOCK_AND_NOTE_LOCKED(szone, locked);
- if (ptr == (void *)szone->last_tiny_free) {
+ if (ptr == szone->last_tiny_free) {
szone->last_tiny_free = NULL;
- // malloc_printf("using last_tiny_free\n");
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
- ptr = (void *)((unsigned)ptr & ~ (TINY_QUANTUM - 1));
+ ptr = (void *)((uintptr_t)ptr & ~ (TINY_QUANTUM - 1));
if (cleared_requested) {
- memset(ptr, 0, msize << SHIFT_TINY_QUANTUM);
+ memset(ptr, 0, TINY_BYTES_FOR_MSIZE(msize));
}
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In tiny_malloc_should_clear(), tiny cache ptr=%p, msize=%d\n", ptr, msize);
+ malloc_printf("in tiny_malloc_should_clear(), tiny cache ptr=%p, msize=%d\n", ptr, msize);
}
#endif
return ptr;
}
- // malloc_printf("optimistic locking for last_tiny_free failed\n");
}
#endif
// Except in rare occasions where we need to add a new region, we are going to end up locking, so we might as well lock right away to avoid doing unnecessary optimistic probes
if (!locked) LOCK_AND_NOTE_LOCKED(szone, locked);
ptr = tiny_malloc_from_free_list(szone, msize);
- // malloc_printf("tiny_malloc_from_free_list(%d) returned %p\n", msize, ptr);
if (ptr) {
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
if (cleared_requested) {
- memset(ptr, 0, msize << SHIFT_TINY_QUANTUM);
+ memset(ptr, 0, TINY_BYTES_FOR_MSIZE(msize));
}
return ptr;
}
ptr = tiny_malloc_from_region_no_lock(szone, msize);
- // malloc_printf("tiny_malloc_from_region_no_lock returned %p for msize=%d\n", ptr, msize);
// we don't clear because this freshly allocated space is pristine
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
@@ -1190,43 +1790,50 @@
}
static INLINE void
-free_tiny(szone_t *szone, void *ptr, tiny_region_t *tiny_region) {
+free_tiny(szone_t *szone, void *ptr, region_t *tiny_region)
+{
+ msize_t msize;
+ boolean_t is_free;
+#if TINY_CACHE
+ void *ptr2;
+#endif
+
// ptr is known to be in tiny_region
SZONE_LOCK(szone);
#if TINY_CACHE
- void *ptr2 = szone->last_tiny_free;
- if (ptr == (void *)((unsigned)ptr2 & ~ (TINY_QUANTUM - 1))) {
- szone_error(szone, "Double free", ptr);
+ ptr2 = szone->last_tiny_free;
+ /* check that we don't already have this pointer in the cache */
+ if (ptr == (void *)((uintptr_t)ptr2 & ~ (TINY_QUANTUM - 1))) {
+ szone_error(szone, "double free", ptr, NULL);
return;
}
#endif /* TINY_CACHE */
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header(ptr, &is_free);
+ msize = get_tiny_meta_header(ptr, &is_free);
if (is_free) {
- szone_error(szone, "Double free", ptr);
+ szone_error(szone, "double free", ptr, NULL);
return;
}
- // malloc_printf("%p[%x]\n", ptr, msize);
#if DEBUG_MALLOC
if (!msize) {
malloc_printf("*** szone_free() block in use is too large: %p\n", ptr);
+ return;
}
#endif
#if TINY_CACHE
if (msize < TINY_QUANTUM) { // to see if the bits fit in the last 4 bits
- szone->last_tiny_free = (void *)(((unsigned)ptr) | msize);
+ if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && msize)
+ memset(ptr, 0x55, TINY_BYTES_FOR_MSIZE(msize));
+ szone->last_tiny_free = (void *)(((uintptr_t)ptr) | msize);
if (!ptr2) {
- // malloc_printf("stuffing last_tiny_free\n");
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
return;
}
- // malloc_printf("replacing previous last_tiny_free %p with %p\n", ptr2, szone->last_tiny_free);
- msize = (unsigned)ptr2 & (TINY_QUANTUM - 1);
- ptr = (void *)(((unsigned)ptr2) & ~ (TINY_QUANTUM - 1));
+ msize = (uintptr_t)ptr2 & (TINY_QUANTUM - 1);
+ ptr = (void *)(((uintptr_t)ptr2) & ~(TINY_QUANTUM - 1));
tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
if (!tiny_region) {
- szone_error(szone, "Double free (tiny cache)", ptr);
+ szone_error(szone, "double free (tiny cache)", ptr, NULL);
}
}
#endif
@@ -1236,260 +1843,267 @@
}
static void
-print_tiny_free_list(szone_t *szone) {
- grain_t slot = 0;
- malloc_printf("Tiny free sizes: ");
- while (slot < NUM_TINY_SLOTS) {
- free_list_t *ptr = szone->tiny_free_list[slot];
- if (ptr) {
- malloc_printf("%s%y[%d]; ", (slot == NUM_TINY_SLOTS-1) ? ">=" : "", (slot+1)*TINY_QUANTUM, free_list_count(ptr));
- }
- slot++;
- }
- malloc_printf("\n");
+print_tiny_free_list(szone_t *szone)
+{
+ grain_t slot = 0;
+ free_list_t *ptr;
+ _SIMPLE_STRING b = _simple_salloc();
+
+ if (b) {
+ _simple_sappend(b, "tiny free sizes: ");
+ while (slot < NUM_TINY_SLOTS) {
+ ptr = szone->tiny_free_list[slot];
+ if (ptr) {
+ _simple_sprintf(b, "%s%y[%d]; ", (slot == NUM_TINY_SLOTS-1) ? ">=" : "", (slot+1)*TINY_QUANTUM, free_list_count(ptr));
+ }
+ slot++;
+ }
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
+ _simple_sfree(b);
+ }
}
static void
-print_tiny_region(boolean_t verbose, tiny_region_t region, size_t bytes_at_end) {
+print_tiny_region(boolean_t verbose, region_t region, size_t bytes_at_end)
+{
unsigned counts[1024];
unsigned in_use = 0;
- vm_address_t start = TINY_REGION_ADDRESS(region);
- vm_address_t current = start;
- vm_address_t limit = TINY_REGION_END(region) - bytes_at_end;
+ uintptr_t start = (uintptr_t)TINY_REGION_ADDRESS(region);
+ uintptr_t current = start;
+ uintptr_t limit = (uintptr_t)TINY_REGION_END(region) - bytes_at_end;
+ boolean_t is_free;
+ msize_t msize;
+ unsigned ci;
+ _SIMPLE_STRING b;
+
memset(counts, 0, 1024 * sizeof(unsigned));
while (current < limit) {
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header((void *)current, &is_free);
- // malloc_printf("%p [%d %d]; ", current, msize, is_free);
+ msize = get_tiny_meta_header((void *)current, &is_free);
if (is_free & !msize && (current == start)) {
// first block is all free
break;
}
if (!msize) {
- malloc_printf("*** Error with %p: msize=%d\n", current, msize);
+ malloc_printf("*** error with %p: msize=%d\n", (void *)current, (unsigned)msize);
break;
}
- if (! is_free) {
+ if (!is_free) {
// block in use
- if (msize > 32) malloc_printf("*** Error at %p msize for in_use is %d\n", current, msize);
- if (msize < 1024) counts[msize]++;
+ if (msize > 32)
+ malloc_printf("*** error at %p msize for in_use is %d\n", (void *)current, msize);
+ if (msize < 1024)
+ counts[msize]++;
in_use++;
}
- current += msize << SHIFT_TINY_QUANTUM;
- }
- malloc_printf("Tiny region [%p-%p, %y]\t", start, TINY_REGION_END(region), (int)TINY_REGION_SIZE);
- malloc_printf("In_use=%d ", in_use);
- if (bytes_at_end) malloc_printf("Untouched=%y ", bytes_at_end);
- if (verbose && in_use) {
- unsigned ci = 0;
- malloc_printf("\n\tSizes in use: ");
- while (ci < 1024) {
- if (counts[ci]) {
- malloc_printf("%d[%d] ", ci << SHIFT_TINY_QUANTUM, counts[ci]);
- }
- ci++;
- }
- }
- malloc_printf("\n");
+ current += TINY_BYTES_FOR_MSIZE(msize);
+ }
+ if ((b = _simple_salloc()) != NULL) {
+ _simple_sprintf(b, "Tiny region [%p-%p, %y]\t", (void *)start, TINY_REGION_END(region), (int)TINY_REGION_SIZE);
+ _simple_sprintf(b, "In_use=%d ", in_use);
+ if (bytes_at_end) _simple_sprintf(b, "untouched=%ly", bytes_at_end);
+ if (verbose && in_use) {
+ _simple_sappend(b, "\n\tSizes in use: ");
+ for (ci = 0; ci < 1024; ci++)
+ if (counts[ci])
+ _simple_sprintf(b, "%d[%d]", TINY_BYTES_FOR_MSIZE(ci), counts[ci]);
+ }
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
+ _simple_sfree(b);
+ }
}
static boolean_t
-tiny_free_list_check(szone_t *szone, grain_t slot) {
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
+tiny_free_list_check(szone_t *szone, grain_t slot)
+{
unsigned count = 0;
free_list_t *ptr = szone->tiny_free_list[slot];
free_list_t *previous = NULL;
+ boolean_t is_free;
+
+ CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
while (ptr) {
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- boolean_t is_free = tiny_meta_header_is_free(ptr);
- if (! is_free) {
- malloc_printf("*** malloc[%d]: In-use ptr in free list slot=%d count=%d ptr=%p\n", getpid(), slot, count, ptr);
- return 0;
- }
- if (((unsigned)ptr) & (TINY_QUANTUM - 1)) {
- malloc_printf("*** malloc[%d]: Unaligned ptr in free list slot=%d count=%d ptr=%p\n", getpid(), slot, count, ptr);
- return 0;
- }
- if (!tiny_region_for_ptr_no_lock(szone, ptr)) {
- malloc_printf("*** malloc[%d]: Ptr not in szone slot=%d count=%d ptr=%p\n", getpid(), slot, count, ptr);
- return 0;
- }
- if (ptr->previous != previous) {
- malloc_printf("*** malloc[%d]: Previous incorrectly set slot=%d count=%d ptr=%p\n", getpid(), slot, count, ptr);
- return 0;
- }
- previous = ptr;
- ptr = ptr->next;
- count++;
- }
- // malloc_printf("tiny_free_list_check passed\n");
+ free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
+ is_free = tiny_meta_header_is_free(ptr);
+ if (! is_free) {
+ malloc_printf("*** in-use ptr in free list slot=%d count=%d ptr=%p\n", slot, count, ptr);
+ return 0;
+ }
+ if (((uintptr_t)ptr) & (TINY_QUANTUM - 1)) {
+ malloc_printf("*** unaligned ptr in free list slot=%d count=%d ptr=%p\n", slot, count, ptr);
+ return 0;
+ }
+ if (!tiny_region_for_ptr_no_lock(szone, ptr)) {
+ malloc_printf("*** ptr not in szone slot=%d count=%d ptr=%p\n", slot, count, ptr);
+ return 0;
+ }
+ if (free_list_unchecksum_ptr(ptr->previous) != previous) {
+ malloc_printf("*** previous incorrectly set slot=%d count=%d ptr=%p\n", slot, count, ptr);
+ return 0;
+ }
+ previous = ptr;
+ ptr = free_list_unchecksum_ptr(ptr->next);
+ count++;
+ }
return 1;
}
/********************* SMALL FREE LIST UTILITIES ************************/
-static INLINE msize_t *
-small_meta_headers(const void *ptr) {
- // returns address of meta info
- unsigned short shifted_base = ((unsigned)ptr) >> SMALL_BLOCKS_ALIGN;
- unsigned headers_start = (shifted_base + 1) << SMALL_BLOCKS_ALIGN;
- return (msize_t *)headers_start;
-}
-
-static INLINE msize_t
-small_meta_index(const void *ptr) {
- // returns address of meta info
- return (((unsigned)ptr) >> SHIFT_SMALL_QUANTUM) & (NUM_SMALL_BLOCKS - 1);
-}
-
-static INLINE msize_t *
-small_meta_header(const void *ptr) {
- // returns address of meta info
- msize_t *meta_headers = small_meta_headers(ptr);
- msize_t index = small_meta_index(ptr);
- return meta_headers + index;
-}
-
+/*
+ * Mark a block as free. Only the first quantum of a block is marked thusly,
+ * the remainder are marked "middle".
+ */
static INLINE void
-small_meta_header_set_is_free(msize_t *meta_headers, msize_t index, msize_t msize) {
- // Indicates that the meta_header for index says 'is free'
+small_meta_header_set_is_free(msize_t *meta_headers, unsigned index, msize_t msize)
+{
meta_headers[index] = msize | SMALL_IS_FREE;
}
+/*
+ * Mark a block as in use. Only the first quantum of a block is marked thusly,
+ * the remainder are marked "middle".
+ */
static INLINE void
-small_meta_header_set_in_use(msize_t *meta_headers, msize_t index, msize_t msize) {
- // Indicates that the meta_header for index says 'in use'
+small_meta_header_set_in_use(msize_t *meta_headers, msize_t index, msize_t msize)
+{
meta_headers[index] = msize;
}
+/*
+ * Mark a quantum as being the second or later in a block.
+ */
static INLINE void
-small_meta_header_set_middle(msize_t *meta_headers, msize_t index) {
- // Indicates that the meta_header for index says 'in the middle of a block'
+small_meta_header_set_middle(msize_t *meta_headers, msize_t index)
+{
meta_headers[index] = 0;
}
+// Adds an item to the proper free list
+// Also marks the header of the block properly
+// Assumes szone has been locked
static void
-small_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize) {
- // Adds an item to the proper free list
- // Also marks the header of the block properly
- // Assumes szone has been locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- grain_t grain = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
+small_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize)
+{
+ grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
free_list_t *free_ptr = ptr;
- free_list_t *free_head = szone->small_free_list[grain];
+ free_list_t *free_head = szone->small_free_list[slot];
+ void *follower;
+
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In small_free_list_add_ptr(), ptr=%p, msize=%d\n", ptr, msize);
- }
- if (((unsigned)ptr) & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "small_free_list_add_ptr: Unaligned ptr", ptr);
+ malloc_printf("in %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
+ }
+ if (((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) {
+ szone_error(szone, "small_free_list_add_ptr: Unaligned ptr", ptr, NULL);
}
#endif
if (free_head) {
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
-#if DEBUG_MALLOC
- if (free_head->previous) {
- malloc_printf("ptr=%p grain=%d free_head=%p previous=%p\n", ptr, grain, free_head, free_head->previous);
- szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr);
- }
- if (!(small_meta_header(free_head)[0] & SMALL_IS_FREE)) {
- malloc_printf("ptr=%p grain=%d free_head=%p\n", ptr, grain, free_head);
- szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr);
- }
-#endif
- free_head->previous = free_ptr;
- free_list_set_checksum(szone, free_head);
+ free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
+#if DEBUG_MALLOC
+ if (free_list_unchecksum_ptr(free_head->previous)) {
+ szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr,
+ "ptr=%p slot=%d free_head=%p previous=%p\n", ptr, slot, free_head, free_head->previous.p);
+ }
+ if (!SMALL_PTR_IS_FREE(free_head)) {
+ szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr,
+ "ptr=%p slot=%d free_head=%p\n", ptr, slot, free_head);
+ }
+#endif
+ free_head->previous.u = free_list_checksum_ptr(free_ptr);
} else {
- BITMAP32_SET(szone->small_bitmap, grain);
- }
- free_ptr->previous = NULL;
- free_ptr->next = free_head;
+ BITMAP32_SET(szone->small_bitmap, slot);
+ }
+ free_ptr->previous.p = NULL;
+ free_ptr->next.p = free_head;
free_list_set_checksum(szone, free_ptr);
- szone->small_free_list[grain] = free_ptr;
- void *follower = ptr + (msize << SHIFT_SMALL_QUANTUM);
+ szone->small_free_list[slot] = free_ptr;
+ follower = ptr + SMALL_BYTES_FOR_MSIZE(msize);
SMALL_PREVIOUS_MSIZE(follower) = msize;
}
+// Removes item in the proper free list
+// msize could be read, but all callers have it so we pass it in
+// Assumes szone has been locked
static void
-small_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize) {
- // Removes item in the proper free list
- // msize could be read, but all callers have it so we pass it in
- // Assumes szone has been locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- grain_t grain = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
- free_list_t *free_ptr = ptr;
- free_list_t *next = free_ptr->next;
- free_list_t *previous = free_ptr->previous;
+small_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize)
+{
+ grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
+ free_list_t *free_ptr = ptr, *next, *previous;
+ free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
+
+ next = free_list_unchecksum_ptr(free_ptr->next);
+ previous = free_list_unchecksum_ptr(free_ptr->previous);
+
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In small_free_list_remove_ptr(), ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
- if (!previous) {
-#if DEBUG_MALLOC
- if (szone->small_free_list[grain] != ptr) {
- malloc_printf("ptr=%p grain=%d msize=%d szone->small_free_list[grain]=%p\n", ptr, grain, msize, szone->small_free_list[grain]);
- szone_error(szone, "small_free_list_remove_ptr: Internal invariant broken (szone->small_free_list[grain])", ptr);
- return;
- }
-#endif
- szone->small_free_list[grain] = next;
- if (!next) BITMAP32_CLR(szone->small_bitmap, grain);
+ malloc_printf("In %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
+ }
+#endif
+ if (!previous) {
+ // The block to remove is the head of the free list
+#if DEBUG_MALLOC
+ if (szone->small_free_list[slot] != ptr) {
+ szone_error(szone, "small_free_list_remove_ptr: Internal invariant broken (szone->small_free_list[grain])", ptr,
+ "ptr=%p slot=%d msize=%d szone->small_free_list[slot]=%p\n",
+ ptr, slot, msize, szone->small_free_list[slot]);
+ return;
+ }
+#endif
+ szone->small_free_list[slot] = next;
+ if (!next) BITMAP32_CLR(szone->small_bitmap, slot);
} else {
- previous->next = next;
- free_list_set_checksum(szone, previous);
+ // We know free_ptr is already checksummed, so we don't need to do it
+ // again.
+ previous->next = free_ptr->next;
}
if (next) {
- next->previous = previous;
- free_list_set_checksum(szone, next);
- }
-}
-
-static INLINE small_region_t *
-small_region_for_ptr_no_lock(szone_t *szone, const void *ptr) {
- small_region_t *region = szone->small_regions;
- unsigned num_regions = szone->num_small_regions;
- unsigned ptr_shifted = ((unsigned)ptr) >> SMALL_BLOCKS_ALIGN;
- while (num_regions--) {
- small_region_t this = *region;
- if (ptr_shifted == this) return region;
- region++;
- }
- return NULL;
+ // We know free_ptr is already checksummed, so we don't need to do it
+ // again.
+ next->previous = free_ptr->previous;
+ }
+}
+
+static INLINE region_t *
+small_region_for_ptr_no_lock(szone_t *szone, const void *ptr)
+{
+ return hash_lookup_region_no_lock(szone->small_regions,
+ szone->num_small_regions_allocated,
+ SMALL_REGION_FOR_PTR(ptr));
}
static INLINE void
-small_free_no_lock(szone_t *szone, small_region_t *region, void *ptr, msize_t msize) {
+small_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize)
+{
+ msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
+ unsigned index = SMALL_META_INDEX_FOR_PTR(ptr);
+ size_t original_size = SMALL_BYTES_FOR_MSIZE(msize);
+ unsigned char *next_block = ((unsigned char *)ptr + original_size);
+ msize_t next_index = index + msize;
+ msize_t previous_msize, next_msize;
+ void *previous;
+
// Assumes locked
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- msize_t *meta_headers = small_meta_headers(ptr);
- msize_t index = small_meta_index(ptr);
- size_t original_size = msize << SHIFT_SMALL_QUANTUM;
- void *next_block = ((char *)ptr + original_size);
- msize_t next_index = index + msize;
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
+ malloc_printf("in small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
}
if (! msize) {
- malloc_printf("In small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- szone_error(szone, "Trying to free small block that is too small", ptr);
- }
- // printf("In small_free_no_lock %p - msize=%d\n", ptr, msize);
+ szone_error(szone, "trying to free small block that is too small", ptr,
+ "in small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
+ }
#endif
// We try to coalesce this block with the preceeding one
if (index && (SMALL_PREVIOUS_MSIZE(ptr) <= index)) {
- msize_t previous_msize = SMALL_PREVIOUS_MSIZE(ptr);
+ previous_msize = SMALL_PREVIOUS_MSIZE(ptr);
if (meta_headers[index - previous_msize] == (previous_msize | SMALL_IS_FREE)) {
- void *previous = ptr - (previous_msize << SHIFT_SMALL_QUANTUM);
+ previous = ptr - SMALL_BYTES_FOR_MSIZE(previous_msize);
// previous is really to be coalesced
#if DEBUG_MALLOC
if (LOG(szone, ptr) || LOG(szone,previous)) {
- malloc_printf("In small_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
+ malloc_printf("in small_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
}
#endif
- // malloc_printf("In small_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
small_free_list_remove_ptr(szone, previous, previous_msize);
small_meta_header_set_middle(meta_headers, index);
ptr = previous;
@@ -1498,22 +2112,21 @@
}
}
// We try to coalesce with the next block
- if (((vm_address_t)next_block < SMALL_REGION_END(*region)) && (meta_headers[next_index] & SMALL_IS_FREE)) {
+ if ((next_block < SMALL_REGION_END(*region)) && (meta_headers[next_index] & SMALL_IS_FREE)) {
// next block is free, we coalesce
- msize_t next_msize = meta_headers[next_index] & ~ SMALL_IS_FREE;
+ next_msize = meta_headers[next_index] & ~ SMALL_IS_FREE;
#if DEBUG_MALLOC
if (LOG(szone,ptr)) malloc_printf("In small_free_no_lock(), for ptr=%p, msize=%d coalesced next block=%p next_msize=%d\n", ptr, msize, next_block, next_msize);
#endif
- // malloc_printf("In small_free_no_lock(), for ptr=%p, msize=%d coalesced next block=%p next_msize=%d\n", ptr, msize, next_block, next_msize);
small_free_list_remove_ptr(szone, next_block, next_msize);
small_meta_header_set_middle(meta_headers, next_index);
msize += next_msize;
}
if (szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) {
if (!msize) {
- szone_error(szone, "Incorrect size information - block header was damaged", ptr);
+ szone_error(szone, "incorrect size information - block header was damaged", ptr, NULL);
} else {
- memset(ptr, 0x55, (msize << SHIFT_SMALL_QUANTUM));
+ memset(ptr, 0x55, SMALL_BYTES_FOR_MSIZE(msize));
}
}
small_free_list_add_ptr(szone, ptr, msize);
@@ -1523,110 +2136,206 @@
}
static void *
-small_malloc_from_region_no_lock(szone_t *szone, msize_t msize) {
+small_malloc_from_region_no_lock(szone_t *szone, msize_t msize)
+{
+ void *last_block;
+ void *ptr;
+ void *new_address;
+ msize_t *meta_headers;
+ msize_t index ;
+ msize_t msize_left;
+
// Allocates from the last region or a freshly allocated region
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
// Before anything we transform the small_bytes_free_at_end - if any - to a regular free block
if (szone->small_bytes_free_at_end) {
- small_region_t last_region = szone->small_regions[szone->num_small_regions - 1];
- void *last_block = (void *)(SMALL_REGION_END(last_region) - szone->small_bytes_free_at_end);
- small_free_list_add_ptr(szone, last_block, szone->small_bytes_free_at_end >> SHIFT_SMALL_QUANTUM);
- small_meta_header(last_block)[0] = (szone->small_bytes_free_at_end >> SHIFT_SMALL_QUANTUM) | SMALL_IS_FREE;
- szone->small_bytes_free_at_end = 0;
- }
- void *ptr;
+ last_block = (void *)(SMALL_REGION_END(szone->last_small_region) - szone->small_bytes_free_at_end);
+ small_free_list_add_ptr(szone, last_block, SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end));
+ *SMALL_METADATA_FOR_PTR(last_block) = SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end) | SMALL_IS_FREE;
+ szone->small_bytes_free_at_end = 0;
+ }
// time to create a new region
- vm_address_t new_address = allocate_pages(szone, SMALL_REGION_SIZE, SMALL_BLOCKS_ALIGN, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC_SMALL));
- if (!new_address) {
- // out of memory!
- return NULL;
- }
- ptr = (void *)new_address;
- msize_t *meta_headers = small_meta_headers(ptr);
- msize_t index = 0;
- // malloc_printf("Allocated small region #%d: %p [%y]\n", szone->num_small_regions, new_address, SMALL_REGION_SIZE);
- if (szone->num_small_regions == INITIAL_NUM_SMALL_REGIONS) {
- // time to grow the number of regions
- unsigned region_capacity = (1 << (32 - SMALL_BLOCKS_ALIGN)) - 20; // that is for sure the maximum number of small regions we can have
- msize_t new_msize = (region_capacity * sizeof(small_region_t) + SMALL_QUANTUM - 1) / SMALL_QUANTUM;
- small_region_t *new_regions = ptr;
- // malloc_printf("Now %d small_regions growing regions %p to %d msize=%d\n", szone->num_small_regions + 1, szone->small_regions, region_capacity, new_msize);
- small_meta_header_set_in_use(meta_headers, index, new_msize);
- szone->num_small_objects++;
- szone->num_bytes_in_small_objects += new_msize << SHIFT_SMALL_QUANTUM;
- memcpy(new_regions, szone->small_regions, INITIAL_NUM_SMALL_REGIONS * sizeof(small_region_t));
- // We intentionally leak the previous regions pointer to avoid multi-threading crashes if another thread was reading it (unlocked) while we are changing it.
- szone->small_regions = new_regions; // note we set this pointer after it's all set
- ptr += new_msize << SHIFT_SMALL_QUANTUM;
- index = new_msize;
- // malloc_printf("Regions is now %p next ptr is %p\n", szone->small_regions, ptr);
- }
- szone->small_regions[szone->num_small_regions] = new_address >> SMALL_BLOCKS_ALIGN;
- szone->num_small_regions++; // we bump the number of regions AFTER we have changes the regions pointer to enable finding a small region without taking the lock
- // malloc_printf("Now %d small regions\n", szone->num_small_regions);
+ new_address = allocate_pages(szone, SMALL_REGION_SIZE, SMALL_BLOCKS_ALIGN,
+ 0, VM_MEMORY_MALLOC_SMALL);
+ if (!new_address)
+ return NULL;
+
+ ptr = new_address;
+ meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
+ index = 0;
+
+ // Check to see if the hash ring of small regions needs to grow. Try to
+ // avoid the hash ring becoming too dense.
+ if (szone->num_small_regions_allocated < (2 * szone->num_small_regions)) {
+ region_t *new_regions;
+ size_t new_size;
+ new_regions = hash_regions_grow_no_lock(szone, szone->small_regions,
+ szone->num_small_regions_allocated,
+ &new_size);
+ // Do not deallocate the current small_regions allocation since someone
+ // may be iterating it. Instead, just leak it.
+ szone->small_regions = new_regions;
+ szone->num_small_regions_allocated = new_size;
+ }
+ // Insert the new region into the hash ring, and update malloc statistics
+ hash_region_insert_no_lock(szone->small_regions,
+ szone->num_small_regions_allocated,
+ new_address);
+ szone->last_small_region = new_address;
+
+ // we bump the number of regions AFTER we have changes the regions pointer
+ // to enable finding a small region without taking the lock
+ //
+ // FIXME: naive assumption assumes memory ordering coherence between this
+ // and other CPUs. This also applies to the near-identical code in
+ // tiny_malloc_from_region_no_lock.
+ szone->num_small_regions++;
small_meta_header_set_in_use(meta_headers, index, msize);
- msize_t msize_left = NUM_SMALL_BLOCKS - index;
+ msize_left = NUM_SMALL_BLOCKS - index;
szone->num_small_objects++;
- szone->num_bytes_in_small_objects += msize << SHIFT_SMALL_QUANTUM;
+ szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(msize);
// add a big free block
index += msize; msize_left -= msize;
meta_headers[index] = msize_left;
- szone->small_bytes_free_at_end = msize_left << SHIFT_SMALL_QUANTUM;
- // malloc_printf("small_bytes_free_at_end set to %d\n", szone-> small_bytes_free_at_end);
+ szone->small_bytes_free_at_end = SMALL_BYTES_FOR_MSIZE(msize_left);
return ptr;
}
+static INLINE boolean_t
+try_realloc_small_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
+{
+ // returns 1 on success
+ msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
+ unsigned index = SMALL_META_INDEX_FOR_PTR(ptr);
+ msize_t old_msize = SMALL_MSIZE_FOR_BYTES(old_size);
+ msize_t new_msize = SMALL_MSIZE_FOR_BYTES(new_size + SMALL_QUANTUM - 1);
+ void *next_block = (char *)ptr + old_size;
+ unsigned next_index = index + old_msize;
+ msize_t next_msize_and_free;
+ msize_t next_msize;
+ msize_t leftover_msize;
+ void *leftover;
+ unsigned leftover_index;
+
+ if (next_index >= NUM_SMALL_BLOCKS) {
+ return 0;
+ }
+#if DEBUG_MALLOC
+ if ((uintptr_t)next_block & (SMALL_QUANTUM - 1)) {
+ szone_error(szone, "internal invariant broken in realloc(next_block)", next_block, NULL);
+ }
+ if (meta_headers[index] != old_msize)
+ malloc_printf("*** try_realloc_small_in_place incorrect old %d %d\n",
+ meta_headers[index], old_msize);
+#endif
+ SZONE_LOCK(szone);
+ /*
+ * Look for a free block immediately afterwards. If it's large enough, we can consume (part of)
+ * it.
+ */
+ next_msize_and_free = meta_headers[next_index];
+ next_msize = next_msize_and_free & ~ SMALL_IS_FREE;
+ if (!(next_msize_and_free & SMALL_IS_FREE) || (old_msize + next_msize < new_msize)) {
+ SZONE_UNLOCK(szone);
+ return 0;
+ }
+ /*
+ * The following block is big enough; pull it from its freelist and chop off enough to satisfy
+ * our needs.
+ */
+ small_free_list_remove_ptr(szone, next_block, next_msize);
+ small_meta_header_set_middle(meta_headers, next_index);
+ leftover_msize = old_msize + next_msize - new_msize;
+ if (leftover_msize) {
+ /* there's some left, so put the remainder back */
+ leftover = (unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(new_msize);
+ small_free_list_add_ptr(szone, leftover, leftover_msize);
+ leftover_index = index + new_msize;
+ small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
+ }
+#if DEBUG_MALLOC
+ if (SMALL_BYTES_FOR_MSIZE(new_msize) >= LARGE_THRESHOLD) {
+ malloc_printf("*** realloc in place for %p exceeded msize=%d\n", new_msize);
+ }
+#endif
+ small_meta_header_set_in_use(meta_headers, index, new_msize);
+#if DEBUG_MALLOC
+ if (LOG(szone,ptr)) {
+ malloc_printf("in szone_realloc(), ptr=%p, msize=%d\n", ptr, *SMALL_METADATA_FOR_PTR(ptr));
+ }
+#endif
+ szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(new_msize - old_msize);
+ SZONE_UNLOCK(szone);
+ CHECK(szone, __PRETTY_FUNCTION__);
+ return 1;
+}
+
static boolean_t
-szone_check_small_region(szone_t *szone, small_region_t *region) {
+szone_check_small_region(szone_t *szone, region_t region)
+{
+ unsigned char *ptr = SMALL_REGION_ADDRESS(region);
+ msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
+ unsigned char *region_end = SMALL_REGION_END(region);
+ msize_t prev_free = 0;
+ unsigned index;
+ msize_t msize_and_free;
+ msize_t msize;
+ free_list_t *free_head;
+ void *previous, *next;
+ msize_t *follower;
+
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- void *ptr = (void *)SMALL_REGION_ADDRESS(*region);
- msize_t *meta_headers = small_meta_headers(ptr);
- vm_address_t region_end = SMALL_REGION_END(*region);
- msize_t prev_free = 0;
- if (region == szone->small_regions + szone->num_small_regions - 1) region_end -= szone->small_bytes_free_at_end;
- while ((vm_address_t)ptr < region_end) {
- msize_t index = small_meta_index(ptr);
- msize_t msize_and_free = meta_headers[index];
- if (! (msize_and_free & SMALL_IS_FREE)) {
+ if (region == szone->last_small_region) region_end -= szone->small_bytes_free_at_end;
+ while (ptr < region_end) {
+ index = SMALL_META_INDEX_FOR_PTR(ptr);
+ msize_and_free = meta_headers[index];
+ if (!(msize_and_free & SMALL_IS_FREE)) {
// block is in use
- msize_t msize = msize_and_free;
+ msize = msize_and_free;
if (!msize) {
- malloc_printf("*** malloc[%d]: invariant broken: null msize ptr=%p region#=%d num_small_regions=%d end=%p\n", getpid(), ptr, region - szone->small_regions, szone->num_small_regions, (void *)region_end);
+ malloc_printf("*** invariant broken: null msize ptr=%p num_small_regions=%d end=%p\n",
+ ptr, szone->num_small_regions, region_end);
return 0;
}
if (msize > (LARGE_THRESHOLD / SMALL_QUANTUM)) {
- malloc_printf("*** malloc[%d]: invariant broken for %p this small msize=%d - size is too large\n", getpid(), ptr, msize_and_free);
+ malloc_printf("*** invariant broken for %p this small msize=%d - size is too large\n",
+ ptr, msize_and_free);
return 0;
}
- ptr += msize << SHIFT_SMALL_QUANTUM;
+ ptr += SMALL_BYTES_FOR_MSIZE(msize);
prev_free = 0;
} else {
// free pointer
- msize_t msize = msize_and_free & ~ SMALL_IS_FREE;
- free_list_t *free_head = ptr;
- msize_t *follower = (void *)FOLLOWING_SMALL_PTR(ptr, msize);
- if (! msize) {
- malloc_printf("*** malloc[%d]: invariant broken for free block %p this msize=%d\n", getpid(), ptr, msize);
+ msize = msize_and_free & ~ SMALL_IS_FREE;
+ free_head = (free_list_t *)ptr;
+ follower = (msize_t *)FOLLOWING_SMALL_PTR(ptr, msize);
+ if (!msize) {
+ malloc_printf("*** invariant broken for free block %p this msize=%d\n", ptr, msize);
return 0;
}
if (prev_free) {
- malloc_printf("*** malloc[%d]: invariant broken for %p (2 free in a row)\n", getpid(), ptr);
+ malloc_printf("*** invariant broken for %p (2 free in a row)\n", ptr);
return 0;
}
free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
- if (free_head->previous && !(small_meta_header(free_head->previous)[0] & SMALL_IS_FREE)) {
- malloc_printf("*** malloc[%d]: invariant broken for %p (previous %p is not a free pointer)\n", getpid(), ptr, free_head->previous);
+ previous = free_list_unchecksum_ptr(free_head->previous);
+ next = free_list_unchecksum_ptr(free_head->next);
+ if (previous && !SMALL_PTR_IS_FREE(previous)) {
+ malloc_printf("*** invariant broken for %p (previous %p is not a free pointer)\n",
+ ptr, free_head->previous);
return 0;
}
- if (free_head->next && !(small_meta_header(free_head->next)[0] & SMALL_IS_FREE)) {
- malloc_printf("*** malloc[%d]: invariant broken for %p (next is not a free pointer)\n", getpid(), ptr);
+ if (next && !SMALL_PTR_IS_FREE(next)) {
+ malloc_printf("*** invariant broken for %p (next is not a free pointer)\n", ptr);
return 0;
}
if (SMALL_PREVIOUS_MSIZE(follower) != msize) {
- malloc_printf("*** malloc[%d]: invariant broken for small free %p followed by %p in region [%p-%p] (end marker incorrect) should be %d; in fact %d\n", getpid(), ptr, follower, SMALL_REGION_ADDRESS(*region), region_end, msize, SMALL_PREVIOUS_MSIZE(follower));
+ malloc_printf("*** invariant broken for small free %p followed by %p in region [%p-%p] "
+ "(end marker incorrect) should be %d; in fact %d\n",
+ ptr, follower, SMALL_REGION_ADDRESS(region), region_end, msize, SMALL_PREVIOUS_MSIZE(follower));
return 0;
}
- ptr = follower;
+ ptr = (unsigned char *)follower;
prev_free = SMALL_IS_FREE;
}
}
@@ -1634,174 +2343,229 @@
}
static kern_return_t
-small_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t region_address, unsigned short num_regions, size_t small_bytes_free_at_end, memory_reader_t reader, vm_range_recorder_t recorder) {
- small_region_t *regions;
- unsigned index = 0;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- unsigned count = 0;
- kern_return_t err;
- err = reader(task, region_address, sizeof(small_region_t) * num_regions, (void **)®ions);
- if (err) return err;
- while (index < num_regions) {
- small_region_t region = regions[index];
- vm_range_t range = {SMALL_REGION_ADDRESS(region), SMALL_REGION_SIZE};
- // malloc_printf("Enumerating small ptrs for Region starting at %p\n", range.address);
- if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
- vm_range_t admin_range = {range.address + (1 << SMALL_BLOCKS_ALIGN), range.size - (1 << SMALL_BLOCKS_ALIGN)};
- recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
- }
- if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
- vm_range_t ptr_range = {range.address, 1 << SMALL_BLOCKS_ALIGN};
- recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
- }
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- unsigned char *mapped_region;
- err = reader(task, range.address, range.size, (void **)&mapped_region);
- if (err) return err;
- msize_t *block_header = (msize_t *)(mapped_region + (1 << SMALL_BLOCKS_ALIGN));
- unsigned block_index = 0;
- unsigned block_limit = NUM_SMALL_BLOCKS;
- if (index == num_regions - 1)
- block_limit -= (small_bytes_free_at_end >> SHIFT_SMALL_QUANTUM);
- while (block_index < block_limit) {
- msize_t msize_and_free = block_header[block_index];
- msize_t msize = msize_and_free & ~ SMALL_IS_FREE;
- if (! (msize_and_free & SMALL_IS_FREE)) {
- // Block in use
- buffer[count].address = range.address + (block_index << SHIFT_SMALL_QUANTUM);
- buffer[count].size = msize << SHIFT_SMALL_QUANTUM;
- count++;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
- }
- block_index += msize;
- }
- // malloc_printf("End small region - count=%d\n", count);
- }
- index++;
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- }
- return 0;
-}
-
-static INLINE void *
-small_malloc_from_free_list(szone_t *szone, msize_t msize) {
+small_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder)
+{
+ size_t num_regions = szone->num_small_regions_allocated;
+ void *last_small_free = szone->last_small_free;
+ size_t index;
+ region_t *regions;
+ vm_range_t buffer[MAX_RECORDER_BUFFER];
+ unsigned count = 0;
+ kern_return_t err;
+ region_t region;
+ vm_range_t range;
+ vm_range_t admin_range;
+ vm_range_t ptr_range;
+ unsigned char *mapped_region;
+ msize_t *block_header;
+ unsigned block_index;
+ unsigned block_limit;
+ msize_t msize_and_free;
+ msize_t msize;
+ vm_address_t last_small_free_ptr = 0;
+ msize_t last_small_free_msize = 0;
+
+ if (last_small_free) {
+ last_small_free_ptr = (uintptr_t)last_small_free & ~(SMALL_QUANTUM - 1);
+ last_small_free_msize = (uintptr_t)last_small_free & (SMALL_QUANTUM - 1);
+ }
+
+ err = reader(task, (vm_address_t)szone->small_regions, sizeof(region_t) * num_regions, (void **)®ions);
+ if (err) return err;
+ for (index = 0; index < num_regions; ++index) {
+ region = regions[index];
+ if (region) {
+ range.address = (vm_address_t)SMALL_REGION_ADDRESS(region);
+ range.size = SMALL_REGION_SIZE;
+ if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
+ admin_range.address = range.address + SMALL_HEADER_START;
+ admin_range.size = SMALL_ARRAY_SIZE;
+ recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
+ }
+ if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
+ ptr_range.address = range.address;
+ ptr_range.size = NUM_SMALL_BLOCKS * SMALL_QUANTUM;
+ recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
+ }
+ if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
+ err = reader(task, range.address, range.size, (void **)&mapped_region);
+ if (err) return err;
+ block_header = (msize_t *)(mapped_region + SMALL_HEADER_START);
+ block_index = 0;
+ block_limit = NUM_SMALL_BLOCKS;
+ if (region == szone->last_small_region)
+ block_limit -= SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end);
+ while (block_index < block_limit) {
+ msize_and_free = block_header[block_index];
+ msize = msize_and_free & ~ SMALL_IS_FREE;
+ if (! (msize_and_free & SMALL_IS_FREE) &&
+ range.address + SMALL_BYTES_FOR_MSIZE(block_index) != last_small_free_ptr) {
+ // Block in use
+ buffer[count].address = range.address + SMALL_BYTES_FOR_MSIZE(block_index);
+ buffer[count].size = SMALL_BYTES_FOR_MSIZE(msize);
+ count++;
+ if (count >= MAX_RECORDER_BUFFER) {
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
+ count = 0;
+ }
+ }
+ block_index += msize;
+ }
+ }
+ }
+ }
+ if (count) {
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
+ }
+ return 0;
+}
+
+static void *
+small_malloc_from_free_list(szone_t *szone, msize_t msize)
+{
+ free_list_t *ptr;
+ msize_t this_msize;
+ grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
+ free_list_t **free_list = szone->small_free_list;
+ free_list_t *next;
+ free_list_t **limit;
+ unsigned bitmap = szone->small_bitmap & ~ ((1 << slot) - 1);
+ msize_t leftover_msize;
+ free_list_t *leftover_ptr;
+ msize_t *meta_headers;
+ unsigned leftover_index;
+
// Assumes locked
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- grain_t grain = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
- unsigned bitmap = szone->small_bitmap & ~ ((1 << grain) - 1);
- void *ptr;
- msize_t this_msize;
- if (!bitmap) goto try_small_from_end;
- grain = BITMAP32_FFS(bitmap) - 1;
- // first try the small grains
- free_list_t **free_list;
- free_list_t **limit = szone->small_free_list + NUM_SMALL_SLOTS - 1;
- free_list = szone->small_free_list + grain;
+
+ // Mask off the bits representing slots holding free blocks smaller than the
+ // size we need. If there are no larger free blocks, try allocating from
+ // the free space at the end of the tiny region.
+ if (!bitmap)
+ goto try_small_from_end;
+
+ slot = BITMAP32_CTZ(bitmap);
+ limit = free_list + NUM_SMALL_SLOTS - 1;
+ free_list += slot;
+
+ // Iterate over freelists looking for free blocks, starting at first list
+ // which is not empty, and contains blocks which are large enough to satisfy
+ // our request.
while (free_list < limit) {
- // try bigger grains
- ptr = *free_list;
- if (ptr) {
- free_list_t *next;
- next = ((free_list_t *)ptr)->next;
- if (next) {
- next->previous = NULL;
- free_list_set_checksum(szone, next);
- }
- *free_list = next;
- this_msize = small_meta_header(ptr)[0] & ~ SMALL_IS_FREE;
- // malloc_printf("small_malloc_from_free_list: allocated from free list\n");
- goto add_leftover_and_proceed;
- }
- free_list++;
- }
- // We now check the large grains for one that is big enough
- ptr = *free_list;
+ ptr = *free_list;
+ if (ptr) {
+ next = free_list_unchecksum_ptr(ptr->next);
+ *free_list = next;
+ this_msize = SMALL_PTR_SIZE(ptr);
+ if (next) {
+ next->previous = ptr->previous;
+ } else {
+ BITMAP32_CLR(szone->small_bitmap, this_msize - 1);
+ }
+ goto add_leftover_and_proceed;
+ }
+ free_list++;
+ }
+
+ // We are now looking at the last slot, which contains blocks equal to, or
+ // due to coalescing of free blocks, larger than 31 * small quantum size.
+ // If the last freelist is not empty, and the head contains a block that is
+ // larger than our request, then the remainder is put back on the free list.
+ //
+ // FIXME: This code doesn't have the optimization from the 'tiny' codepath
+ // that optimizes for the this_msize >= 2 * num slots
+ // FIXME: this code also seems somewhat bogus. There's a check for
+ // this_msize >= msize, but by definition we can't ask for a small
+ // block larger than 31 small quanta, and every free block in this
+ // slot has to be at least that large.
+ ptr = *limit;
while (ptr) {
- this_msize = small_meta_header(ptr)[0] & ~ SMALL_IS_FREE;
- if (this_msize >= msize) {
- // malloc_printf("small_malloc_from_free_list: allocated from last free list\n");
- small_free_list_remove_ptr(szone, ptr, this_msize);
- goto add_leftover_and_proceed;
- }
- ptr = ((free_list_t *)ptr)->next;
- }
+ free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
+ next = free_list_unchecksum_ptr(ptr->next);
+ this_msize = SMALL_PTR_SIZE(ptr);
+ if (this_msize >= msize) {
+ small_free_list_remove_ptr(szone, ptr, this_msize);
+ goto add_leftover_and_proceed;
+ }
+ ptr = next;
+ }
+
try_small_from_end:
// Let's see if we can use szone->small_bytes_free_at_end
- // malloc_printf("Found nothing in free list small_bytes_free_at_end=%y\n", szone-> small_bytes_free_at_end);
- if (szone->small_bytes_free_at_end >= (msize << SHIFT_SMALL_QUANTUM)) {
- ptr = (void *)(SMALL_REGION_END(szone->small_regions[szone->num_small_regions-1]) - szone->small_bytes_free_at_end);
- szone->small_bytes_free_at_end -= msize << SHIFT_SMALL_QUANTUM;
- if (szone->small_bytes_free_at_end) {
- // let's mark this block as in use to serve as boundary
- small_meta_header(ptr + (msize << SHIFT_SMALL_QUANTUM))[0] = szone->small_bytes_free_at_end >> SHIFT_SMALL_QUANTUM;
- }
- this_msize = msize;
- goto return_small_alloc;
+ if (szone->small_bytes_free_at_end >= SMALL_BYTES_FOR_MSIZE(msize)) {
+ ptr = (free_list_t *)(SMALL_REGION_END(szone->last_small_region) - szone->small_bytes_free_at_end);
+ szone->small_bytes_free_at_end -= SMALL_BYTES_FOR_MSIZE(msize);
+ if (szone->small_bytes_free_at_end) {
+ // let's mark this block as in use to serve as boundary
+ *SMALL_METADATA_FOR_PTR((unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(msize)) = SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end);
+ }
+ this_msize = msize;
+ goto return_small_alloc;
}
return NULL;
+
add_leftover_and_proceed:
if (this_msize > msize) {
- msize_t leftover_msize = this_msize - msize;
- void *leftover_ptr = ptr + (msize << SHIFT_SMALL_QUANTUM);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In small_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- small_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
- msize_t *meta_headers = small_meta_headers(leftover_ptr);
- msize_t leftover_index = small_meta_index(leftover_ptr);
- small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
- this_msize = msize;
- }
+ leftover_msize = this_msize - msize;
+ leftover_ptr = (free_list_t *)((unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(msize));
+#if DEBUG_MALLOC
+ if (LOG(szone,ptr)) {
+ malloc_printf("in small_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
+ }
+#endif
+ small_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
+ meta_headers = SMALL_META_HEADER_FOR_PTR(leftover_ptr);
+ leftover_index = SMALL_META_INDEX_FOR_PTR(leftover_ptr);
+ small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
+ this_msize = msize;
+ }
+
return_small_alloc:
szone->num_small_objects++;
- szone->num_bytes_in_small_objects += this_msize << SHIFT_SMALL_QUANTUM;
+ szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(this_msize);
#if DEBUG_MALLOC
if (LOG(szone,ptr)) {
- malloc_printf("In small_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
- }
-#endif
- small_meta_header(ptr)[0] = this_msize;
+ malloc_printf("in small_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
+ }
+#endif
+ *SMALL_METADATA_FOR_PTR(ptr) = this_msize;
return ptr;
}
static INLINE void *
-small_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) {
+small_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested)
+{
boolean_t locked = 0;
+#if SMALL_CACHE
void *ptr;
+#endif
+
#if SMALL_CACHE
ptr = (void *)szone->last_small_free;
- if ((((unsigned)ptr) & (SMALL_QUANTUM - 1)) == msize) {
+ if ((((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) == msize) {
// we have a candidate - let's lock to make sure
LOCK_AND_NOTE_LOCKED(szone, locked);
if (ptr == (void *)szone->last_small_free) {
szone->last_small_free = NULL;
- // malloc_printf("using last_small_free\n");
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
- ptr = (void *)((unsigned)ptr & ~ (SMALL_QUANTUM - 1));
+ ptr = (void *)((uintptr_t)ptr & ~ (SMALL_QUANTUM - 1));
if (cleared_requested) {
- memset(ptr, 0, msize << SHIFT_SMALL_QUANTUM);
+ memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
}
return ptr;
}
- // malloc_printf("optimistic locking for last_small_free failed\n");
- }
-#endif
- // Except in rare occasions where we need to add a new region, we are going to end up locking, so we might as well lock right away to avoid doing unnecessary optimistic probes
+ }
+#endif
+ // Except in rare occasions where we need to add a new region, we are going to end up locking,
+ // so we might as well lock right away to avoid doing unnecessary optimistic probes
if (!locked) LOCK_AND_NOTE_LOCKED(szone, locked);
ptr = small_malloc_from_free_list(szone, msize);
if (ptr) {
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
if (cleared_requested) {
- memset(ptr, 0, msize << SHIFT_SMALL_QUANTUM);
+ memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
}
return ptr;
}
@@ -1812,15 +2576,17 @@
return ptr;
}
+// tries to allocate a small, cleared block
static INLINE void *
-small_malloc_cleared_no_lock(szone_t *szone, msize_t msize) {
- // tries to allocate a small, cleared block
+small_malloc_cleared_no_lock(szone_t *szone, msize_t msize)
+{
+ void *ptr;
+
// Assumes already locked
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- void *ptr;
ptr = small_malloc_from_free_list(szone, msize);
if (ptr) {
- memset(ptr, 0, msize << SHIFT_SMALL_QUANTUM);
+ memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
return ptr;
} else {
ptr = small_malloc_from_region_no_lock(szone, msize);
@@ -1830,184 +2596,325 @@
}
static INLINE void
-free_small(szone_t *szone, void *ptr, small_region_t *small_region) {
+free_small(szone_t *szone, void *ptr, region_t *small_region)
+{
+ msize_t msize = SMALL_PTR_SIZE(ptr);
+#if SMALL_CACHE
+ void *ptr2;
+#endif
+
// ptr is known to be in small_region
- msize_t msize_and_free;
- msize_and_free = small_meta_header(ptr)[0];
- if (msize_and_free & SMALL_IS_FREE) {
- szone_error(szone, "Object already freed being freed", ptr);
- return;
- }
- CHECK(szone, __PRETTY_FUNCTION__);
- // malloc_printf("%p[%x]\n", ptr, msize_and_free);
SZONE_LOCK(szone);
#if SMALL_CACHE
- void *ptr2 = szone->last_small_free;
- szone->last_small_free = (void *)(((unsigned)ptr) | msize_and_free);
+ ptr2 = szone->last_small_free;
+ /* check that we don't already have this pointer in the cache */
+ if (ptr == (void *)((uintptr_t)ptr2 & ~ (SMALL_QUANTUM - 1))) {
+ szone_error(szone, "double free", ptr, NULL);
+ return;
+ }
+#endif
+ if (SMALL_PTR_IS_FREE(ptr)) {
+ szone_error(szone, "double free", ptr, NULL);
+ return;
+ }
+#if SMALL_CACHE
+ szone->last_small_free = (void *)(((uintptr_t)ptr) | msize);
if (!ptr2) {
- // malloc_printf("stuffing last_small_free\n");
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
return;
}
- // malloc_printf("replacing previous last_small_free %p with %p\n", ptr2, szone->last_small_free);
- msize_and_free = (unsigned)ptr2 & (SMALL_QUANTUM - 1);
- ptr = (void *)(((unsigned)ptr2) & ~ (SMALL_QUANTUM - 1));
+ msize = (uintptr_t)ptr2 & (SMALL_QUANTUM - 1);
+ ptr = (void *)(((uintptr_t)ptr2) & ~ (SMALL_QUANTUM - 1));
small_region = small_region_for_ptr_no_lock(szone, ptr);
if (!small_region) {
- szone_error(szone, "Double free (small cache)", ptr);
- }
-#endif
- small_free_no_lock(szone, small_region, ptr, msize_and_free);
+ szone_error(szone, "double free (small cache)", ptr, NULL);
+ return;
+ }
+#endif
+ small_free_no_lock(szone, small_region, ptr, msize);
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
}
static void
-print_small_free_list(szone_t *szone) {
+print_small_free_list(szone_t *szone)
+{
grain_t grain = 0;
- malloc_printf("Small free sizes: ");
- while (grain < NUM_SMALL_SLOTS) {
- free_list_t *ptr = szone->small_free_list[grain];
- if (ptr) {
- malloc_printf("%s%y[%d]; ", (grain == NUM_SMALL_SLOTS-1) ? ">=" : "", (grain + 1) * SMALL_QUANTUM, free_list_count(ptr));
- }
- grain++;
- }
- malloc_printf("\n");
+ free_list_t *ptr;
+ _SIMPLE_STRING b = _simple_salloc();
+
+ if (b) {
+ _simple_sappend(b, "small free sizes: ");
+ while (grain < NUM_SMALL_SLOTS) {
+ ptr = szone->small_free_list[grain];
+ if (ptr) {
+ _simple_sprintf(b, "%s%y[%d]; ", (grain == NUM_SMALL_SLOTS-1) ? ">=" : "", (grain + 1) * SMALL_QUANTUM, free_list_count(ptr));
+ }
+ grain++;
+ }
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
+ _simple_sfree(b);
+ }
}
static void
-print_small_region(szone_t *szone, boolean_t verbose, small_region_t *region, size_t bytes_at_end) {
- unsigned counts[1024];
- unsigned in_use = 0;
- vm_address_t start = SMALL_REGION_ADDRESS(*region);
- vm_address_t limit = SMALL_REGION_END(*region) - bytes_at_end;
+print_small_region(szone_t *szone, boolean_t verbose, region_t region, size_t bytes_at_end)
+{
+ unsigned counts[1024];
+ unsigned in_use = 0;
+ void *start = SMALL_REGION_ADDRESS(region);
+ void *limit = SMALL_REGION_END(region) - bytes_at_end;
+ msize_t msize_and_free;
+ msize_t msize;
+ unsigned ci;
+ _SIMPLE_STRING b;
+
memset(counts, 0, 1024 * sizeof(unsigned));
while (start < limit) {
- msize_t msize_and_free = small_meta_header((void *)start)[0];
- msize_t msize = msize_and_free & ~ SMALL_IS_FREE;
+ msize_and_free = *SMALL_METADATA_FOR_PTR(start);
+ msize = msize_and_free & ~ SMALL_IS_FREE;
if (!(msize_and_free & SMALL_IS_FREE)) {
// block in use
- if (msize < 1024) counts[msize]++;
+ if (msize < 1024)
+ counts[msize]++;
in_use++;
}
- start += msize << SHIFT_SMALL_QUANTUM;
- }
- malloc_printf("Small region [%p-%p, %y]\tIn_use=%d ", SMALL_REGION_ADDRESS(*region), SMALL_REGION_END(*region), (int)SMALL_REGION_SIZE, in_use);
- if (bytes_at_end) malloc_printf("Untouched=%y ", bytes_at_end);
- if (verbose && in_use) {
- unsigned ci = 0;
- malloc_printf("\n\tSizes in use: ");
- while (ci < 1024) {
- if (counts[ci]) {
- malloc_printf("%d[%d] ", ci << SHIFT_SMALL_QUANTUM, counts[ci]);
- }
- ci++;
- }
- }
- malloc_printf("\n");
+ start += SMALL_BYTES_FOR_MSIZE(msize);
+ }
+ if ((b = _simple_salloc()) != NULL) {
+ _simple_sprintf(b, "Small region [%p-%p, %y]\tIn_use=%d ",
+ SMALL_REGION_ADDRESS(region), SMALL_REGION_END(region), (int)SMALL_REGION_SIZE, in_use);
+ if (bytes_at_end)
+ _simple_sprintf(b, "Untouched=%ly", bytes_at_end);
+ if (verbose && in_use) {
+ _simple_sappend(b, "\n\tSizes in use: ");
+ for (ci = 0; ci < 1024; ci++)
+ if (counts[ci])
+ _simple_sprintf(b, "%d[%d] ", SMALL_BYTES_FOR_MSIZE(ci), counts[ci]);
+ }
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
+ _simple_sfree(b);
+ }
}
static boolean_t
-small_free_list_check(szone_t *szone, grain_t grain) {
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
+small_free_list_check(szone_t *szone, grain_t grain)
+{
unsigned count = 0;
free_list_t *ptr = szone->small_free_list[grain];
free_list_t *previous = NULL;
+ msize_t msize_and_free;
+
+ CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
while (ptr) {
- msize_t msize_and_free = small_meta_header(ptr)[0];
- count++;
- if (!(msize_and_free & SMALL_IS_FREE)) {
- malloc_printf("*** malloc[%d]: In-use ptr in free list grain=%d count=%d ptr=%p\n", getpid(), grain, count, ptr);
- return 0;
- }
- if (((unsigned)ptr) & (SMALL_QUANTUM - 1)) {
- malloc_printf("*** malloc[%d]: Unaligned ptr in free list grain=%d count=%d ptr=%p\n", getpid(), grain, count, ptr);
- return 0;
- }
- if (!small_region_for_ptr_no_lock(szone, ptr)) {
- malloc_printf("*** malloc[%d]: Ptr not in szone grain=%d count=%d ptr=%p\n", getpid(), grain, count, ptr);
- return 0;
- }
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- if (ptr->previous != previous) {
- malloc_printf("*** malloc[%d]: Previous incorrectly set grain=%d count=%d ptr=%p\n", getpid(), grain, count, ptr);
- return 0;
- }
- previous = ptr;
- ptr = ptr->next;
+ msize_and_free = *SMALL_METADATA_FOR_PTR(ptr);
+ count++;
+ if (!(msize_and_free & SMALL_IS_FREE)) {
+ malloc_printf("*** in-use ptr in free list grain=%d count=%d ptr=%p\n", grain, count, ptr);
+ return 0;
+ }
+ if (((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) {
+ malloc_printf("*** unaligned ptr in free list grain=%d count=%d ptr=%p\n", grain, count, ptr);
+ return 0;
+ }
+ if (!small_region_for_ptr_no_lock(szone, ptr)) {
+ malloc_printf("*** ptr not in szone grain=%d count=%d ptr=%p\n", grain, count, ptr);
+ return 0;
+ }
+ free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
+ if (free_list_unchecksum_ptr(ptr->previous) != previous) {
+ malloc_printf("*** previous incorrectly set grain=%d count=%d ptr=%p\n", grain, count, ptr);
+ return 0;
+ }
+ previous = ptr;
+ ptr = free_list_unchecksum_ptr(ptr->next);
}
return 1;
}
-/********************* LARGE ENTRY UTILITIES ************************/
-
-#if DEBUG_MALLOC
-
+/*******************************************************************************
+ * Region hash implementation
+ *
+ * This is essentially a duplicate of the existing Large allocator hash, minus
+ * the ability to remove entries. The two should be combined eventually.
+ ******************************************************************************/
+#pragma mark region hash
+
+/*
+ * hash_lookup_region_no_lock - Scan a hash ring looking for an entry for a
+ * given region.
+ *
+ * FIXME: If consecutive queries of the same region are likely, a one-entry
+ * cache would likely be a significant performance win here.
+ */
+static region_t *
+hash_lookup_region_no_lock(region_t *regions, size_t num_entries, region_t r) {
+ size_t index, hash_index;
+ region_t *entry;
+
+ if (!num_entries)
+ return 0;
+
+ index = hash_index = ((uintptr_t)r >> 20) % num_entries;
+ do {
+ entry = regions + index;
+ if (*entry == 0)
+ return 0;
+ if (*entry == r)
+ return entry;
+ if (++index == num_entries)
+ index = 0;
+ } while (index != hash_index);
+ return 0;
+}
+
+/*
+ * hash_region_insert_no_lock - Insert a region into the hash ring.
+ */
static void
-large_debug_print(szone_t *szone) {
- unsigned num_large_entries = szone->num_large_entries;
- unsigned index = num_large_entries;
- while (index--) {
- large_entry_t *range = szone->large_entries + index;
- large_entry_t entry = *range;
- if (!LARGE_ENTRY_IS_EMPTY(entry)) {
- malloc_printf("%d: %p(%y); ", index, LARGE_ENTRY_ADDRESS(entry), LARGE_ENTRY_SIZE(entry));
- }
- }
- malloc_printf("\n");
-}
-#endif
-
+hash_region_insert_no_lock(region_t *regions, size_t num_entries, region_t r) {
+ size_t index, hash_index;
+ region_t *entry;
+
+ index = hash_index = ((uintptr_t)r >> 20) % num_entries;
+ do {
+ entry = regions + index;
+ if (*entry == 0) {
+ *entry = r;
+ return;
+ }
+ if (++index == num_entries)
+ index = 0;
+ } while (index != hash_index);
+}
+
+/*
+ * hash_regions_alloc_no_lock - Allocate space for a number of entries. This
+ * must be a VM allocation as to avoid recursing between allocating a new small
+ * region, and asking the small region to allocate space for the new list of
+ * regions.
+ */
+static region_t *
+hash_regions_alloc_no_lock(szone_t *szone, size_t num_entries)
+{
+ size_t size = num_entries * sizeof(region_t);
+ return allocate_pages(szone, round_page(size), 0, 0, VM_MEMORY_MALLOC);
+}
+
+/*
+ * hash_regions_grow_no_lock - Grow the hash ring, and rehash the entries.
+ * Return the new region and new size to update the szone. Do not deallocate
+ * the old entries since someone may still be allocating them.
+ */
+static region_t *
+hash_regions_grow_no_lock(szone_t *szone, region_t *regions, size_t old_size,
+ size_t *new_size)
+{
+ // double in size and allocate memory for the regions
+ *new_size = old_size * 2 + 1;
+ region_t *new_regions = hash_regions_alloc_no_lock(szone, *new_size);
+
+ // rehash the entries into the new list
+ size_t index;
+ for (index = 0; index < old_size; ++index) {
+ region_t r = regions[index];
+ if (r != 0)
+ hash_region_insert_no_lock(new_regions, *new_size, r);
+ }
+ return new_regions;
+}
+
+/*******************************************************************************
+ * Large allocator implementation
+ ******************************************************************************/
+#pragma mark large allocator
+
+#if DEBUG_MALLOC
+
+static void
+large_debug_print(szone_t *szone)
+{
+ unsigned num_large_entries = szone->num_large_entries;
+ unsigned index = num_large_entries;
+ large_entry_t *range;
+ _SIMPLE_STRING b = _simple_salloc();
+
+ if (b) {
+ for (index = 0, range = szone->large_entries; index < szone->num_large_entries; index++, range++)
+ if (!LARGE_ENTRY_IS_EMPTY(*range))
+ _simple_sprintf(b, "%d: %p(%y); ", index, LARGE_ENTRY_ADDRESS(*range), LARGE_ENTRY_SIZE(*range));
+
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
+ _simple_sfree(b);
+ }
+}
+#endif
+
+/*
+ * Scan the hash ring looking for an entry for the given pointer.
+ */
static large_entry_t *
-large_entry_for_pointer_no_lock(szone_t *szone,
- const void *ptr) {
- // result only valid during a lock
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index;
- unsigned index;
- if (!num_large_entries) return NULL;
- hash_index = ((unsigned)ptr >> vm_page_shift) % num_large_entries;
+large_entry_for_pointer_no_lock(szone_t *szone, const void *ptr)
+{
+ // result only valid with lock held
+ unsigned num_large_entries = szone->num_large_entries;
+ unsigned hash_index;
+ unsigned index;
+ large_entry_t *range;
+
+ if (!num_large_entries)
+ return NULL;
+ hash_index = ((uintptr_t)ptr >> vm_page_shift) % num_large_entries;
index = hash_index;
do {
- large_entry_t *range = szone->large_entries + index;
- large_entry_t entry = *range;
- if (LARGE_ENTRY_MATCHES(entry, ptr)) return range;
- if (LARGE_ENTRY_IS_EMPTY(entry)) return NULL; // end of chain
- index++; if (index == num_large_entries) index = 0;
+ range = szone->large_entries + index;
+ if (LARGE_ENTRY_MATCHES(*range, ptr))
+ return range;
+ if (LARGE_ENTRY_IS_EMPTY(*range))
+ return NULL; // end of chain
+ index++;
+ if (index == num_large_entries)
+ index = 0;
} while (index != hash_index);
return NULL;
}
static void
-large_entry_insert_no_lock(szone_t *szone, large_entry_t range) {
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index = (range.address_and_num_pages >> vm_page_shift)
- % num_large_entries;
- unsigned index = hash_index;
-// malloc_printf("Before insertion of %p\n", LARGE_ENTRY_ADDRESS(range));
+large_entry_insert_no_lock(szone_t *szone, large_entry_t range)
+{
+ unsigned num_large_entries = szone->num_large_entries;
+ unsigned hash_index = (range.address_and_num_pages >> vm_page_shift) % num_large_entries;
+ unsigned index = hash_index;
+ large_entry_t *entry;
+
do {
- large_entry_t *entry = szone->large_entries + index;
+ entry = szone->large_entries + index;
if (LARGE_ENTRY_IS_EMPTY(*entry)) {
*entry = range;
return; // end of chain
}
- index++; if (index == num_large_entries) index = 0;
+ index++;
+ if (index == num_large_entries)
+ index = 0;
} while (index != hash_index);
}
static INLINE void
-large_entries_rehash_after_entry_no_lock(szone_t *szone,
- large_entry_t *entry) {
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index = entry - szone->large_entries;
- unsigned index = hash_index;
+large_entries_rehash_after_entry_no_lock(szone_t *szone, large_entry_t *entry)
+{
+ unsigned num_large_entries = szone->num_large_entries;
+ unsigned hash_index = entry - szone->large_entries;
+ unsigned index = hash_index;
+ large_entry_t range;
+
do {
- large_entry_t range;
- index++; if (index == num_large_entries) index = 0;
+ index++;
+ if (index == num_large_entries)
+ index = 0;
range = szone->large_entries[index];
- if (LARGE_ENTRY_IS_EMPTY(range)) return;
+ if (LARGE_ENTRY_IS_EMPTY(range))
+ return;
szone->large_entries[index].address_and_num_pages = 0;
large_entry_insert_no_lock(szone, range); // this will reinsert in the
// proper place
@@ -2015,55 +2922,66 @@
}
static INLINE large_entry_t *
-large_entries_alloc_no_lock(szone_t *szone,
- unsigned num) {
+large_entries_alloc_no_lock(szone_t *szone, unsigned num)
+{
size_t size = num * sizeof(large_entry_t);
boolean_t is_vm_allocation = size >= LARGE_THRESHOLD;
+
if (is_vm_allocation) {
// Note that we allocate memory (via a system call) under a spin lock
// That is certainly evil, however it's very rare in the lifetime of a process
// The alternative would slow down the normal case
- return (void *)allocate_pages(szone, round_page(size), 0, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC_LARGE));
+ return allocate_pages(szone, round_page(size), 0, 0, VM_MEMORY_MALLOC_LARGE);
} else {
- return small_malloc_cleared_no_lock(szone, (size + SMALL_QUANTUM - 1) >> SHIFT_SMALL_QUANTUM);
+ return small_malloc_cleared_no_lock(szone, SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1));
}
}
static void
-large_entries_free_no_lock(szone_t *szone, large_entry_t *entries, unsigned num, vm_range_t *range_to_deallocate) {
+large_entries_free_no_lock(szone_t *szone, large_entry_t *entries, unsigned num, vm_range_t *range_to_deallocate)
+{
// returns range to deallocate
- size_t size = num * sizeof(large_entry_t);
- boolean_t is_vm_allocation = size >= LARGE_THRESHOLD;
- // malloc_printf("In large_entries_free_no_lock %d %d\n", num, is_vm_allocation);
+ size_t size = num * sizeof(large_entry_t);
+ boolean_t is_vm_allocation = size >= LARGE_THRESHOLD;
+ region_t *region;
+ msize_t msize_and_free;
+
if (is_vm_allocation) {
range_to_deallocate->address = (vm_address_t)entries;
range_to_deallocate->size = round_page(size);
} else {
range_to_deallocate->size = 0;
- small_region_t *region = small_region_for_ptr_no_lock(szone, entries);
- msize_t msize_and_free = small_meta_header(entries)[0];
+ region = small_region_for_ptr_no_lock(szone, entries);
+ msize_and_free = *SMALL_METADATA_FOR_PTR(entries);
if (msize_and_free & SMALL_IS_FREE) {
- szone_error(szone, "Object already freed being freed", entries);
+ szone_error(szone, "object already freed being freed", entries, NULL);
return;
}
small_free_no_lock(szone, region, entries, msize_and_free);
}
}
-static void
-large_entries_grow_no_lock(szone_t *szone, vm_range_t *range_to_deallocate) {
+static large_entry_t *
+large_entries_grow_no_lock(szone_t *szone, vm_range_t *range_to_deallocate)
+{
// sets range_to_deallocate
unsigned old_num_entries = szone->num_large_entries;
large_entry_t *old_entries = szone->large_entries;
- unsigned new_num_entries = (old_num_entries) ? old_num_entries
- * 2 + 1 : 63; // always an odd number for good hashing
+ unsigned new_num_entries = (old_num_entries) ? old_num_entries * 2 + 1 : 63; // always an odd number for good hashing
large_entry_t *new_entries = large_entries_alloc_no_lock(szone, new_num_entries);
unsigned index = old_num_entries;
+ large_entry_t oldRange;
+
+ // if the allocation of new entries failed, bail
+ if (new_entries == NULL)
+ return NULL;
+
szone->num_large_entries = new_num_entries;
szone->large_entries = new_entries;
- // malloc_printf("_grow_large_entries old_num_entries=%d new_num_entries=%d %p\n", old_num_entries, new_num_entries, old_entries);
+
+ /* rehash entries into the new list */
while (index--) {
- large_entry_t oldRange = old_entries[index];
+ oldRange = old_entries[index];
if (!LARGE_ENTRY_IS_EMPTY(oldRange)) {
large_entry_insert_no_lock(szone, oldRange);
}
@@ -2073,33 +2991,31 @@
} else {
range_to_deallocate->size = 0;
}
-}
-
+ return new_entries;
+}
+
+// frees the specific entry in the size table
+// returns a range to truly deallocate
static vm_range_t
-large_free_no_lock(szone_t *szone, large_entry_t *entry) {
- // frees the specific entry in the size table
- // returns a range to truly deallocate
+large_free_no_lock(szone_t *szone, large_entry_t *entry)
+{
vm_range_t range;
- range.address = LARGE_ENTRY_ADDRESS(*entry);
- range.size = LARGE_ENTRY_SIZE(*entry);
- szone->num_large_objects_in_use --;
+
+ range.address = (vm_address_t)LARGE_ENTRY_ADDRESS(*entry);
+ range.size = (vm_size_t)LARGE_ENTRY_SIZE(*entry);
+ szone->num_large_objects_in_use--;
szone->num_bytes_in_large_objects -= range.size;
if (szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) {
- protect(szone, range.address, range.size, VM_PROT_READ | VM_PROT_WRITE,
- szone->debug_flags);
- range.address -= 1 << vm_page_shift;
- range.size += 2 * (1 << vm_page_shift);
- }
-// malloc_printf("Entry is %p=%d; cache is %p ; found=%p\n", entry,
-// entry-szone->large_entries, szone->large_entries,
-// large_entry_for_pointer_no_lock(szone, (void *)range.address));
+ protect((void *)range.address, range.size, VM_PROT_READ | VM_PROT_WRITE, szone->debug_flags);
+ range.address -= vm_page_size;
+ range.size += 2 * vm_page_size;
+ }
entry->address_and_num_pages = 0;
large_entries_rehash_after_entry_no_lock(szone, entry);
#if DEBUG_MALLOC
if (large_entry_for_pointer_no_lock(szone, (void *)range.address)) {
- malloc_printf("*** malloc[%d]: Freed entry %p still in use; "
- "num_large_entries=%d\n", getpid(), range.address,
- szone->num_large_entries);
+ malloc_printf("*** freed entry %p still in use; num_large_entries=%d\n",
+ range.address, szone->num_large_entries);
large_debug_print(szone);
szone_sleep();
}
@@ -2107,102 +3023,40 @@
return range;
}
-static INLINE boolean_t
-try_realloc_small_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) {
- // returns 1 on success
- msize_t *meta_headers = small_meta_headers(ptr);
- msize_t index = small_meta_index(ptr);
- msize_t old_msize = old_size >> SHIFT_SMALL_QUANTUM;
- msize_t new_msize = (new_size + SMALL_QUANTUM - 1) >> SHIFT_SMALL_QUANTUM;
- void *next_block = (char *)ptr + old_size;
- msize_t next_index = index + old_msize;
- if (next_index >= NUM_SMALL_BLOCKS) {
- // malloc_printf("try_realloc_small_in_place can't take place at end %p %d %d %d\n", ptr, old_size, new_size, next_index);
- return 0;
- }
-#if DEBUG_MALLOC
- if ((vm_address_t)next_block & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "Internal invariant broken in realloc(next_block)", next_block);
- }
- if (meta_headers[index] != old_msize) malloc_printf("*** try_realloc_small_in_place incorrect old %d %d\n", meta_headers[index], old_msize);
-#endif
- SZONE_LOCK(szone);
- // If the next block is free, we coalesce
- msize_t next_msize_and_free;
- msize_t next_msize;
- next_msize_and_free = meta_headers[next_index];
- next_msize = next_msize_and_free & ~ SMALL_IS_FREE;
- if (!(next_msize_and_free & SMALL_IS_FREE) || (old_msize + next_msize < new_msize)) {
- SZONE_UNLOCK(szone);
- return 0;
- }
- // malloc_printf("Small realloc in place for %p; current msize=%db(%d) next=%p next_msize=%d wanted=%db(%d)\n", ptr, old_size, meta_headers[index], next_block, next_msize, new_size, new_msize);
- small_free_list_remove_ptr(szone, next_block, next_msize);
- small_meta_header_set_middle(meta_headers, next_index);
- msize_t leftover_msize = old_msize + next_msize - new_msize;
- if (leftover_msize) {
- void *leftover = ptr + (new_msize << SHIFT_SMALL_QUANTUM);
- // malloc_printf("Leftover in realloc in place %p msize=%d\n", leftover, leftover_msize);
- small_free_list_add_ptr(szone, leftover, leftover_msize);
- msize_t leftover_index = index + new_msize;
- small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
- }
-#if DEBUG_MALLOC
- if ((new_msize << SHIFT_SMALL_QUANTUM) >= LARGE_THRESHOLD) {
- malloc_printf("*** Realloc in place for %p exceeded msize=%d\n", new_msize);
- }
-#endif
- small_meta_header_set_in_use(meta_headers, index, new_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In szone_realloc(), ptr=%p, msize=%d\n", ptr, small_meta_header(ptr)[0]);
- }
-#endif
- szone->num_bytes_in_small_objects += (new_msize - old_msize) << SHIFT_SMALL_QUANTUM;
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
-// malloc_printf("Extended ptr %p for realloc old=%d desired=%d new=%d "
-// "leftover=%d\n", ptr, (unsigned)old_size, (unsigned)new_size,
-// (unsigned)szone_size(szone, ptr), leftover_msize << SHIFT_SMALL_QUANTUM);
- return 1;
-}
-
static kern_return_t
-large_in_use_enumerator(task_t task, void *context,
- unsigned type_mask, vm_address_t large_entries_address, unsigned num_entries,
- memory_reader_t reader, vm_range_recorder_t recorder) {
+large_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t large_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder)
+{
unsigned index = 0;
vm_range_t buffer[MAX_RECORDER_BUFFER];
unsigned count = 0;
large_entry_t *entries;
kern_return_t err;
- err = reader(task, large_entries_address,
- sizeof(large_entry_t) * num_entries, (void **)&entries);
- if (err) return err;
+ vm_range_t range;
+ large_entry_t entry;
+
+ err = reader(task, large_entries_address, sizeof(large_entry_t) * num_entries, (void **)&entries);
+ if (err)
+ return err;
index = num_entries;
- if ((type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE)
- && (num_entries * sizeof(large_entry_t) >= LARGE_THRESHOLD)) {
- vm_range_t range;
+ if ((type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) &&
+ (num_entries * sizeof(large_entry_t) >= LARGE_THRESHOLD)) {
range.address = large_entries_address;
range.size = round_page(num_entries * sizeof(large_entry_t));
recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &range, 1);
}
- if (type_mask & (MALLOC_PTR_IN_USE_RANGE_TYPE
- | MALLOC_PTR_REGION_RANGE_TYPE))
- while (index--) {
- large_entry_t entry = entries[index];
- if (!LARGE_ENTRY_IS_EMPTY(entry)) {
- vm_range_t range;
- range.address = LARGE_ENTRY_ADDRESS(entry);
- range.size = LARGE_ENTRY_SIZE(entry);
- buffer[count++] = range;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE
- | MALLOC_PTR_REGION_RANGE_TYPE, buffer, count);
- count = 0;
+ if (type_mask & (MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE))
+ while (index--) {
+ entry = entries[index];
+ if (!LARGE_ENTRY_IS_EMPTY(entry)) {
+ range.address = (vm_address_t)LARGE_ENTRY_ADDRESS(entry);
+ range.size = (vm_size_t)LARGE_ENTRY_SIZE(entry);
+ buffer[count++] = range;
+ if (count >= MAX_RECORDER_BUFFER) {
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE, buffer, count);
+ count = 0;
+ }
}
}
- }
if (count) {
recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE
| MALLOC_PTR_REGION_RANGE_TYPE, buffer, count);
@@ -2213,36 +3067,48 @@
/********************* HUGE ENTRY UTILITIES ************************/
static huge_entry_t *
-huge_entry_for_pointer_no_lock(szone_t *szone,
- const void *ptr) {
- unsigned index = szone->num_huge_entries;
- while (index--) {
- huge_entry_t *huge = szone->huge_entries + index;
- if (huge->address == (vm_address_t)ptr) return huge;
+huge_entry_for_pointer_no_lock(szone_t *szone, const void *ptr)
+{
+ unsigned index;
+ huge_entry_t *huge;
+
+ for (index = szone->num_huge_entries, huge = szone->huge_entries;
+ index > 0;
+ index--, huge++) {
+
+ if ((void *)huge->address == ptr)
+ return huge;
}
return NULL;
}
static boolean_t
-huge_entry_append(szone_t *szone, huge_entry_t huge) {
+huge_entry_append(szone_t *szone, huge_entry_t huge)
+{
+ huge_entry_t *new_huge_entries = NULL, *old_huge_entries;
+ unsigned num_huge_entries;
+
// We do a little dance with locking because doing allocation (even in the
// default szone) may cause something to get freed in this szone, with a
// deadlock
// Returns 1 on success
- huge_entry_t *new_huge_entries = NULL;
SZONE_LOCK(szone);
- while (1) {
- unsigned num_huge_entries;
+ for (;;) {
num_huge_entries = szone->num_huge_entries;
SZONE_UNLOCK(szone);
-// malloc_printf("In huge_entry_append currentEntries=%d\n", num_huge_entries);
- if (new_huge_entries) szone_free(szone, new_huge_entries);
+ /* check for counter wrap */
+ if ((num_huge_entries + 1) < num_huge_entries)
+ return 0;
+ /* stale allocation from last time around the loop? */
+ if (new_huge_entries)
+ szone_free(szone, new_huge_entries);
new_huge_entries = szone_malloc(szone, (num_huge_entries + 1) * sizeof(huge_entry_t));
- if (new_huge_entries == NULL) return 0;
+ if (new_huge_entries == NULL)
+ return 0;
SZONE_LOCK(szone);
if (num_huge_entries == szone->num_huge_entries) {
// No change - our malloc still applies
- huge_entry_t *old_huge_entries = szone->huge_entries;
+ old_huge_entries = szone->huge_entries;
if (num_huge_entries) {
memcpy(new_huge_entries, old_huge_entries, num_huge_entries * sizeof(huge_entry_t));
}
@@ -2250,7 +3116,6 @@
szone->huge_entries = new_huge_entries;
SZONE_UNLOCK(szone);
szone_free(szone, old_huge_entries);
-// malloc_printf("Done huge_entry_append now=%d\n", szone->num_huge_entries);
return 1;
}
// try again!
@@ -2258,53 +3123,58 @@
}
static kern_return_t
-huge_in_use_enumerator(task_t task, void *context,
- unsigned type_mask, vm_address_t huge_entries_address, unsigned num_entries,
- memory_reader_t reader, vm_range_recorder_t recorder) {
+huge_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t huge_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder)
+{
huge_entry_t *entries;
kern_return_t err;
- err = reader(task, huge_entries_address, sizeof(huge_entry_t) * num_entries,
- (void **)&entries);
- if (err) return err;
- if (num_entries) {
- recorder(task, context,
- MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE, entries,
- num_entries);
- }
+
+ err = reader(task, huge_entries_address, sizeof(huge_entry_t) * num_entries, (void **)&entries);
+ if (err)
+ return err;
+ if (num_entries)
+ recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE, entries, num_entries);
+
return 0;
}
static void *
-large_and_huge_malloc(szone_t *szone, unsigned num_pages) {
- vm_address_t addr = 0;
+large_and_huge_malloc(szone_t *szone, size_t num_pages)
+{
+ void *addr;
vm_range_t range_to_deallocate;
- if (!num_pages) num_pages = 1; // minimal allocation size for this szone
-// malloc_printf("In large_and_huge_malloc for %y\n", num_pages * (1 << vm_page_shift));
+ huge_entry_t huge_entry;
+ size_t size;
+ large_entry_t large_entry;
+
+ if (!num_pages)
+ num_pages = 1; // minimal allocation size for this szone
+ size = (size_t)num_pages << vm_page_shift;
range_to_deallocate.size = 0;
if (num_pages >= (1 << vm_page_shift)) {
- huge_entry_t huge;
- huge.size = num_pages << vm_page_shift;
- addr = allocate_pages(szone, huge.size, 0, szone->debug_flags, VM_MAKE_TAG(VM_MEMORY_MALLOC_HUGE));
- if (!addr) return NULL;
- huge.address = addr;
- if (! huge_entry_append(szone, huge)) return NULL;
+ addr = allocate_pages(szone, size, 0, szone->debug_flags, VM_MEMORY_MALLOC_HUGE);
+ if (addr == NULL)
+ return NULL;
+ huge_entry.size = size;
+ huge_entry.address = (vm_address_t)addr;
+ if (!huge_entry_append(szone, huge_entry))
+ return NULL; // we are leaking the allocation here
SZONE_LOCK(szone);
- szone->num_bytes_in_huge_objects += huge.size;
+ szone->num_bytes_in_huge_objects += size;
} else {
- vm_size_t size = num_pages << vm_page_shift;
- large_entry_t entry;
- addr = allocate_pages(szone, size, 0, szone->debug_flags, VM_MAKE_TAG(VM_MEMORY_MALLOC_LARGE));
-#if DEBUG_MALLOC
- if (LOG(szone, addr)) malloc_printf("In szone_malloc true large allocation at %p for %y\n", (void *)addr, size);
+
+ addr = allocate_pages(szone, size, 0, szone->debug_flags, VM_MEMORY_MALLOC_LARGE);
+#if DEBUG_MALLOC
+ if (LOG(szone, addr))
+ malloc_printf("in szone_malloc true large allocation at %p for %ly\n", (void *)addr, size);
#endif
SZONE_LOCK(szone);
- if (!addr) {
+ if (addr == NULL) {
SZONE_UNLOCK(szone);
return NULL;
}
#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, (void *)addr)) {
- malloc_printf("Freshly allocated is already in use: %p\n", addr);
+ if (large_entry_for_pointer_no_lock(szone, addr)) {
+ malloc_printf("freshly allocated is already in use: %p\n", addr);
large_debug_print(szone);
szone_sleep();
}
@@ -2312,54 +3182,53 @@
if ((szone->num_large_objects_in_use + 1) * 4 > szone->num_large_entries) {
// density of hash table too high; grow table
// we do that under lock to avoid a race
- // malloc_printf("In szone_malloc growing hash table current=%d\n", szone->num_large_entries);
- large_entries_grow_no_lock(szone, &range_to_deallocate);
- }
-// malloc_printf("Inserting large entry (%p, %y)\n", addr, num_pages * (1 << vm_page_shift));
- entry.address_and_num_pages = addr | num_pages;
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, (void *)addr)) {
- malloc_printf("Entry about to be added already in use: %p\n",
- addr);
+ large_entry_t *entries = large_entries_grow_no_lock(szone, &range_to_deallocate);
+ if (entries == NULL) {
+ SZONE_UNLOCK(szone);
+ return NULL;
+ }
+ }
+ large_entry.address_and_num_pages = (uintptr_t)addr | num_pages;
+#if DEBUG_MALLOC
+ if (large_entry_for_pointer_no_lock(szone, addr)) {
+ malloc_printf("entry about to be added already in use: %p\n", addr);
large_debug_print(szone);
szone_sleep();
}
#endif
- large_entry_insert_no_lock(szone, entry);
+ large_entry_insert_no_lock(szone, large_entry);
#if DEBUG_MALLOC
if (!large_entry_for_pointer_no_lock(szone, (void *)addr)) {
- malloc_printf("Can't find entry just added\n");
+ malloc_printf("can't find entry just added\n");
large_debug_print(szone);
szone_sleep();
}
#endif
-// malloc_printf("Inserted large entry (%p, %d pages)\n", addr,
-// num_pages);
szone->num_large_objects_in_use ++;
szone->num_bytes_in_large_objects += size;
}
SZONE_UNLOCK(szone);
if (range_to_deallocate.size) {
- deallocate_pages(szone, range_to_deallocate.address, range_to_deallocate.size, 0); // we deallocate outside the lock
- // malloc_printf("Deallocated large entries %d\n", range_to_deallocate.size);
+ deallocate_pages(szone, (void *)range_to_deallocate.address, range_to_deallocate.size, 0); // we deallocate outside the lock
}
return (void *)addr;
}
static INLINE void
-free_large_or_huge(szone_t *szone, void *ptr) {
+free_large_or_huge(szone_t *szone, void *ptr)
+{
// We have established ptr is page-aligned and not tiny nor small
large_entry_t *entry;
vm_range_t vm_range_to_deallocate;
huge_entry_t *huge;
+
SZONE_LOCK(szone);
entry = large_entry_for_pointer_no_lock(szone, ptr);
if (entry) {
-// malloc_printf("Ready for deallocation [%p-%y]\n", LARGE_ENTRY_ADDRESS(*entry), LARGE_ENTRY_SIZE(*entry));
vm_range_to_deallocate = large_free_no_lock(szone, entry);
#if DEBUG_MALLOC
if (large_entry_for_pointer_no_lock(szone, ptr)) {
- malloc_printf("*** malloc[%d]: Just after freeing %p still in use num_large_entries=%d\n", getpid(), ptr, szone->num_large_entries);
+ malloc_printf("*** just after freeing %p still in use num_large_entries=%d\n", ptr, szone->num_large_entries);
large_debug_print(szone);
szone_sleep();
}
@@ -2367,50 +3236,49 @@
} else if ((huge = huge_entry_for_pointer_no_lock(szone, ptr))) {
vm_range_to_deallocate = *huge;
*huge = szone->huge_entries[--szone->num_huge_entries]; // last entry fills that spot
- szone->num_bytes_in_huge_objects -= vm_range_to_deallocate.size;
+ szone->num_bytes_in_huge_objects -= (size_t)vm_range_to_deallocate.size;
} else {
#if DEBUG_MALLOC
large_debug_print(szone);
#endif
- szone_error(szone, "Pointer being freed was not allocated", ptr);
+ szone_error(szone, "pointer being freed was not allocated", ptr, NULL);
return;
}
SZONE_UNLOCK(szone); // we release the lock asap
CHECK(szone, __PRETTY_FUNCTION__);
// we deallocate_pages, including guard pages
if (vm_range_to_deallocate.address) {
-// malloc_printf("About to deallocate %p size %y\n", vm_range_to_deallocate.address, vm_range_to_deallocate.size);
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone,
- (void *)vm_range_to_deallocate.address)) {
- malloc_printf("*** malloc[%d]: Invariant broken: %p still in use num_large_entries=%d\n", getpid(), vm_range_to_deallocate.address, szone->num_large_entries);
+#if DEBUG_MALLOC
+ if (large_entry_for_pointer_no_lock(szone, (void *)vm_range_to_deallocate.address)) {
+ malloc_printf("*** invariant broken: %p still in use num_large_entries=%d\n", vm_range_to_deallocate.address, szone->num_large_entries);
large_debug_print(szone);
szone_sleep();
}
#endif
- deallocate_pages(szone, vm_range_to_deallocate.address, vm_range_to_deallocate.size, 0);
+ deallocate_pages(szone, (void *)vm_range_to_deallocate.address, (size_t)vm_range_to_deallocate.size, 0);
}
}
static INLINE int
-try_realloc_large_or_huge_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) {
+try_realloc_large_or_huge_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
+{
vm_address_t addr = (vm_address_t)ptr + old_size;
- large_entry_t *entry;
+ large_entry_t *large_entry, saved_entry;
+ huge_entry_t *huge_entry, huge;
kern_return_t err;
+
#if DEBUG_MALLOC
if (old_size != ((old_size >> vm_page_shift) << vm_page_shift)) {
malloc_printf("*** old_size is %d\n", old_size);
}
#endif
-// malloc_printf("=== Trying (1) to extend %p from %d to %d\n", ptr, old_size, new_size);
SZONE_LOCK(szone);
- entry = large_entry_for_pointer_no_lock(szone, (void *)addr);
+ large_entry = large_entry_for_pointer_no_lock(szone, (void *)addr);
SZONE_UNLOCK(szone);
- if (entry) {
- return 0; // large pointer already exist in table - extension is not going to work
+ if (large_entry) {
+ return 0; // large pointer already exists in table - extension is not going to work
}
new_size = round_page(new_size);
-// malloc_printf("=== Trying (2) to extend %p from %d to %d\n", ptr, old_size, new_size);
/*
* Ask for allocation at a specific address, and mark as realloc
* to request coalescing with previous realloc'ed extensions.
@@ -2427,34 +3295,35 @@
* Note: this logic is predicated on the understanding that an allocated
* block can never really shrink, so that the new size will always be
* larger than the old size.
+ *
+ * Note: the use of 1 << vm_page_shift here has to do with the subdivision
+ * of the bits in the large_entry_t, and not the size of a page (directly).
*/
if ((new_size >> vm_page_shift) < (1 << vm_page_shift)) {
/* extend existing large entry */
- entry = large_entry_for_pointer_no_lock(szone, ptr);
- if (!entry) {
- szone_error(szone, "large entry reallocated is not properly in table", ptr);
+ large_entry = large_entry_for_pointer_no_lock(szone, ptr);
+ if (!large_entry) {
+ szone_error(szone, "large entry reallocated is not properly in table", ptr, NULL);
/* XXX will cause fault on next reference to entry */
}
- entry->address_and_num_pages = (vm_address_t)ptr | (new_size >> vm_page_shift);
+ large_entry->address_and_num_pages = (uintptr_t)ptr | (new_size >> vm_page_shift);
szone->num_bytes_in_large_objects += new_size - old_size;
} else if ((old_size >> vm_page_shift) >= (1 << vm_page_shift)) {
/* extend existing huge entry */
- huge_entry_t *huge_entry = huge_entry_for_pointer_no_lock(szone, ptr);
+ huge_entry = huge_entry_for_pointer_no_lock(szone, ptr);
if (!huge_entry) {
- szone_error(szone, "huge entry reallocated is not properly in table", ptr);
+ szone_error(szone, "huge entry reallocated is not properly in table", ptr, NULL);
/* XXX will cause fault on next reference to huge_entry */
}
huge_entry->size = new_size;
szone->num_bytes_in_huge_objects += new_size - old_size;
} else {
/* need to convert large entry to huge entry */
- huge_entry_t huge;
/* release large entry, note we still have the VM allocation */
- entry = large_entry_for_pointer_no_lock(szone, ptr);
- large_entry_t saved_entry = *entry; // in case we need to put it back
- large_free_no_lock(szone, entry);
- szone->num_bytes_in_large_objects -= old_size;
+ large_entry = large_entry_for_pointer_no_lock(szone, ptr);
+ saved_entry = *large_entry; // in case we need to put it back
+ large_free_no_lock(szone, large_entry);
/* and get a huge entry */
huge.address = (vm_address_t)ptr;
@@ -2468,7 +3337,6 @@
// we leak memory (the extra space appended) but data structures are correct
large_entry_insert_no_lock(szone, saved_entry); // this will reinsert the large entry
}
-// malloc_printf("=== Successfully reallocated at end of %p from %d to %d\n", ptr, old_size, new_size);
SZONE_UNLOCK(szone); // we release the lock asap
return 1;
}
@@ -2476,124 +3344,174 @@
/********************* Zone call backs ************************/
static void
-szone_free(szone_t *szone, void *ptr) {
- // malloc_printf("szone_free(%p)\n", ptr);
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) malloc_printf("In szone_free with %p\n", ptr);
-#endif
- if (!ptr) return;
- if ((vm_address_t)ptr & (TINY_QUANTUM - 1)) {
- szone_error(szone, "Non-aligned pointer being freed", ptr);
+szone_free(szone_t *szone, void *ptr)
+{
+ region_t *tiny_region;
+ region_t *small_region;
+
+#if DEBUG_MALLOC
+ if (LOG(szone, ptr))
+ malloc_printf("in szone_free with %p\n", ptr);
+#endif
+ if (!ptr)
return;
- }
- // try a tiny pointer
- tiny_region_t *tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
- if (tiny_region) {
+ /*
+ * Try to free to a tiny region.
+ */
+ if ((uintptr_t)ptr & (TINY_QUANTUM - 1)) {
+ szone_error(szone, "Non-aligned pointer being freed", ptr, NULL);
+ return;
+ }
+ if ((tiny_region = tiny_region_for_ptr_no_lock(szone, ptr)) != NULL) {
+ if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS) {
+ szone_error(szone, "Pointer to metadata being freed", ptr, NULL);
+ return;
+ }
free_tiny(szone, ptr, tiny_region);
return;
}
- if ((vm_address_t)ptr & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "Non-aligned pointer being freed (2)", ptr);
+
+ /*
+ * Try to free to a small region.
+ */
+ if ((uintptr_t)ptr & (SMALL_QUANTUM - 1)) {
+ szone_error(szone, "Non-aligned pointer being freed (2)", ptr, NULL);
return;
}
- // try a small pointer
- small_region_t *small_region = small_region_for_ptr_no_lock(szone, ptr);
- if (small_region) {
+ if ((small_region = small_region_for_ptr_no_lock(szone, ptr)) != NULL) {
+ if (SMALL_META_INDEX_FOR_PTR(ptr) >= NUM_SMALL_BLOCKS) {
+ szone_error(szone, "Pointer to metadata being freed (2)", ptr, NULL);
+ return;
+ }
free_small(szone, ptr, small_region);
return;
}
- if (((unsigned)ptr) & ((1 << vm_page_shift) - 1)) {
- szone_error(szone, "Non-page-aligned, non-allocated pointer being freed", ptr);
+
+ /* check that it's a legal large/huge allocation */
+ if ((uintptr_t)ptr & (vm_page_size - 1)) {
+ szone_error(szone, "non-page-aligned, non-allocated pointer being freed", ptr, NULL);
return;
}
free_large_or_huge(szone, ptr);
}
static INLINE void *
-szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested) {
+szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested)
+{
void *ptr;
+ msize_t msize;
+
if (size <= 31*TINY_QUANTUM) {
// think tiny
- msize_t msize = (size + TINY_QUANTUM - 1) >> SHIFT_TINY_QUANTUM;
- if (! msize) msize = 1;
+ msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
+ if (!msize)
+ msize = 1;
ptr = tiny_malloc_should_clear(szone, msize, cleared_requested);
} else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (size < LARGE_THRESHOLD)) {
// think small
- msize_t msize = (size + SMALL_QUANTUM - 1) >> SHIFT_SMALL_QUANTUM;
+ msize = SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1);
if (! msize) msize = 1;
ptr = small_malloc_should_clear(szone, msize, cleared_requested);
} else {
- unsigned num_pages;
- num_pages = round_page(size) >> vm_page_shift;
+ // large or huge
+ size_t num_pages = round_page(size) >> vm_page_shift;
+ if (num_pages == 0) /* Overflowed */
+ ptr = 0;
+ else
ptr = large_and_huge_malloc(szone, num_pages);
}
#if DEBUG_MALLOC
- if (LOG(szone, ptr)) malloc_printf("szone_malloc returned %p\n", ptr);
-#endif
+ if (LOG(szone, ptr))
+ malloc_printf("szone_malloc returned %p\n", ptr);
+#endif
+ /*
+ * If requested, scribble on allocated memory.
+ */
+ if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && ptr && !cleared_requested && size)
+ memset(ptr, 0xaa, size);
+
return ptr;
}
static void *
szone_malloc(szone_t *szone, size_t size) {
- // malloc_printf("szone_malloc(%d)\n", size);
- void *ptr = szone_malloc_should_clear(szone, size, 0);
- // malloc_printf("szone_malloc(%d) -> %p %d\n", size, ptr, malloc_size(ptr));
- return ptr;
+ return szone_malloc_should_clear(szone, size, 0);
}
static void *
-szone_calloc(szone_t *szone, size_t num_items, size_t size) {
- // malloc_printf("szone_calloc(%d,%d)\n", num_items, size);
- void *ptr = szone_malloc_should_clear(szone, num_items * size, 1);
- // malloc_printf("szone_calloc(%d,%d) -> %p\n", num_items, size, ptr);
- return ptr;
+szone_calloc(szone_t *szone, size_t num_items, size_t size)
+{
+ size_t total_bytes = num_items * size;
+ if ((num_items > 1) && (size != 0) && ((total_bytes / size) != num_items))
+ return NULL;
+ return szone_malloc_should_clear(szone, total_bytes, 1);
}
static void *
-szone_valloc(szone_t *szone, size_t size) {
+szone_valloc(szone_t *szone, size_t size)
+{
void *ptr;
- unsigned num_pages;
+ size_t num_pages;
+
num_pages = round_page(size) >> vm_page_shift;
ptr = large_and_huge_malloc(szone, num_pages);
#if DEBUG_MALLOC
- if (LOG(szone, ptr)) malloc_printf("szone_valloc returned %p\n", ptr);
+ if (LOG(szone, ptr))
+ malloc_printf("szone_valloc returned %p\n", ptr);
#endif
return ptr;
}
static size_t
-szone_size(szone_t *szone, const void *ptr) {
+szone_size(szone_t *szone, const void *ptr)
+{
size_t size = 0;
+ boolean_t is_free;
+ msize_t msize, msize_and_free;
large_entry_t *entry;
huge_entry_t *huge;
- // malloc_printf("szone_size(%p)\n", ptr);
- if (!ptr) return 0;
+
+ if (!ptr)
+ return 0;
#if DEBUG_MALLOC
if (LOG(szone, ptr)) {
- malloc_printf("In szone_size for %p (szone=%p)\n", ptr, szone);
- }
-#endif
- if ((vm_address_t)ptr & (TINY_QUANTUM - 1)) return 0;
- // Try tiny
- tiny_region_t *tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
- if (tiny_region) {
- // this is indeed a valid pointer
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header(ptr, &is_free);
- return (is_free) ? 0 : msize << SHIFT_TINY_QUANTUM;
- }
- if ((vm_address_t)ptr & (SMALL_QUANTUM - 1)) return 0;
- // Try a small
- small_region_t *small_region = small_region_for_ptr_no_lock(szone, ptr);
- if (small_region) {
- // this is indeed a valid pointer
- msize_t msize_and_free = small_meta_header(ptr)[0];
- return (msize_and_free & SMALL_IS_FREE) ? 0 : msize_and_free << SHIFT_SMALL_QUANTUM;
- }
- if (((unsigned)ptr) & ((1 << vm_page_shift) - 1)) {
- // malloc_printf("Object %p not found in szone_size\n", ptr);
+ malloc_printf("in szone_size for %p (szone=%p)\n", ptr, szone);
+ }
+#endif
+
+ /*
+ * Look for it in a tiny region.
+ */
+ if ((uintptr_t)ptr & (TINY_QUANTUM - 1))
return 0;
- }
+ if (tiny_region_for_ptr_no_lock(szone, ptr)) {
+ if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS)
+ return 0;
+ msize = get_tiny_meta_header(ptr, &is_free);
+ return (is_free) ? 0 : TINY_BYTES_FOR_MSIZE(msize);
+ }
+
+ /*
+ * Look for it in a small region.
+ */
+ if ((uintptr_t)ptr & (SMALL_QUANTUM - 1))
+ return 0;
+ if (small_region_for_ptr_no_lock(szone, ptr)) {
+ if (SMALL_META_INDEX_FOR_PTR(ptr) >= NUM_SMALL_BLOCKS)
+ return 0;
+ msize_and_free = *SMALL_METADATA_FOR_PTR(ptr);
+ return (msize_and_free & SMALL_IS_FREE) ? 0 : SMALL_BYTES_FOR_MSIZE(msize_and_free);
+ }
+
+ /*
+ * If not page-aligned, it cannot have come from a large or huge allocation.
+ */
+ if ((uintptr_t)ptr & (vm_page_size - 1))
+ return(0);
+
+ /*
+ * Look for it in a large or huge entry.
+ */
SZONE_LOCK(szone);
entry = large_entry_for_pointer_no_lock(szone, ptr);
if (entry) {
@@ -2602,7 +3520,6 @@
size = huge->size;
}
SZONE_UNLOCK(szone);
- // malloc_printf("szone_size for large/huge %p returned %d\n", ptr, (unsigned)size);
#if DEBUG_MALLOC
if (LOG(szone, ptr)) {
malloc_printf("szone_size for %p returned %d\n", ptr, (unsigned)size);
@@ -2612,203 +3529,238 @@
}
static void *
-szone_realloc(szone_t *szone, void *ptr, size_t new_size) {
- size_t old_size = 0;
+szone_realloc(szone_t *szone, void *ptr, size_t new_size)
+{
+ size_t old_size;
void *new_ptr;
- // malloc_printf("szone_realloc(%p,%d)\n", ptr, new_size);
+
#if DEBUG_MALLOC
if (LOG(szone, ptr)) {
- malloc_printf("In szone_realloc for %p, %d\n", ptr, (unsigned)new_size);
+ malloc_printf("in szone_realloc for %p, %d\n", ptr, (unsigned)new_size);
}
#endif
if (!ptr) {
ptr = szone_malloc(szone, new_size);
- // malloc_printf("szone_realloc(%p,%d) -> %p\n", ptr, new_size, ptr);
return ptr;
}
old_size = szone_size(szone, ptr);
if (!old_size) {
- szone_error(szone, "Pointer being reallocated was not allocated", ptr);
+ szone_error(szone, "pointer being reallocated was not allocated", ptr, NULL);
return NULL;
}
/* we never shrink an allocation */
- if (old_size >= new_size) return ptr;
+ if (old_size >= new_size)
+ return ptr;
+
+ /*
+ * If the old and new sizes both suit the tiny allocator, try to reallocate in-place.
+ */
if ((new_size + TINY_QUANTUM - 1) <= 31 * TINY_QUANTUM) {
- // We now try to realloc in place
if (try_realloc_tiny_in_place(szone, ptr, old_size, new_size)) {
- // malloc_printf("szone_realloc(%p,%d) -> %p\n", ptr, new_size, ptr);
return ptr;
}
- } else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && ((new_size + SMALL_QUANTUM - 1) < LARGE_THRESHOLD) && (old_size > 31 * TINY_QUANTUM)) {
- // We now try to realloc in place
+
+ /*
+ * If the old and new sizes both suit the small allocator, and we're not protecting the
+ * small allocations, try to reallocate in-place.
+ */
+ } else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) &&
+ ((new_size + SMALL_QUANTUM - 1) < LARGE_THRESHOLD) &&
+ (old_size > 31 * TINY_QUANTUM)) {
if (try_realloc_small_in_place(szone, ptr, old_size, new_size)) {
- // malloc_printf("szone_realloc(%p,%d) small in place -> %p\n", ptr, new_size, ptr);
return ptr;
}
+
+ /*
+ * If the allocation's a large or huge allocation, try to reallocate in-place there.
+ */
} else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (old_size > LARGE_THRESHOLD)) {
if (try_realloc_large_or_huge_in_place(szone, ptr, old_size, new_size)) {
return ptr;
}
}
+
+ /*
+ * Can't reallocate in place for whatever reason; allocate a new buffer and copy.
+ */
new_ptr = szone_malloc(szone, new_size);
- if (new_ptr == NULL) return NULL;
- if ((old_size > VM_COPY_THRESHOLD) && (new_size > VM_COPY_THRESHOLD)) {
- // we know everything is page-aligned try vm_copy
- kern_return_t err = 0;
- err = vm_copy(mach_task_self(), (vm_address_t)ptr, old_size, (vm_address_t)new_ptr);
- if (err) {
- szone_error(szone, "Can't vm_copy region", ptr);
- }
- } else {
+ if (new_ptr == NULL)
+ return NULL;
+
+ /*
+ * If the allocation's large enough, try to copy using VM. If that fails, or
+ * if it's too small, just copy by hand.
+ */
+ if ((old_size < VM_COPY_THRESHOLD) ||
+ vm_copy(mach_task_self(), (vm_address_t)ptr, old_size, (vm_address_t)new_ptr))
memcpy(new_ptr, ptr, old_size);
- }
szone_free(szone, ptr);
+
#if DEBUG_MALLOC
if (LOG(szone, ptr)) {
malloc_printf("szone_realloc returned %p for %d\n", new_ptr, (unsigned)new_size);
}
#endif
- // malloc_printf("szone_realloc(%p,%d) -> %p\n", ptr, new_size, new_ptr);
return new_ptr;
}
-unsigned
-szone_batch_malloc(szone_t *szone, size_t size, void **results, unsigned count) {
- // given a size, returns pointers capable of holding that size
- // returns the number of pointers allocated
- // may return 0 - this function will do best attempts, but just that
- // malloc_printf("In szone_batch_malloc(%d, %d)\n", size, count);
- if (size > 31*TINY_QUANTUM) return 0; // only bother implementing this for tiny
- msize_t msize = (size + TINY_QUANTUM - 1) >> SHIFT_TINY_QUANTUM;
- if (! msize) msize = 1;
- size_t chunk_size = msize << SHIFT_TINY_QUANTUM;
- unsigned found = 0;
+// given a size, returns the number of pointers allocated capable of holding
+// that size, up to the limit specified by the 'count' argument. These pointers
+// are stored in the 'results' array, which must be allocated by the caller.
+// may return zero, since this function is only a best attempt at allocating
+// the pointers. clients should be prepared to call malloc for any additional
+// blocks they need.
+static unsigned
+szone_batch_malloc(szone_t *szone, size_t size, void **results, unsigned count)
+{
+ msize_t msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
+ unsigned found = 0;
+
+ // only bother implementing this for tiny
+ if (size > 31*TINY_QUANTUM)
+ return 0;
+ // make sure to return objects at least one quantum in size
+ if (!msize)
+ msize = 1;
+
CHECK(szone, __PRETTY_FUNCTION__);
- SZONE_LOCK(szone); // might as well lock right here to avoid concurrency issues
- free_list_t **free_list = szone->tiny_free_list + msize - 1;
- free_list_t *ptr = *free_list;
- while (found < count) {
- if (!ptr) break;
- *results++ = ptr; found++;
- set_tiny_meta_header_in_use(ptr, msize);
- ptr = ((free_list_t *)ptr)->next;
- }
- if (ptr) {
- ((free_list_t *)ptr)->previous = NULL;
- free_list_set_checksum(szone, (free_list_t *)ptr);
- }
- *free_list = (void *)ptr;
- // Note that we could allocate from the free lists for larger msize
- // But that may un-necessarily fragment - so we might as well let the client do that
- // We could also allocate from szone->tiny_bytes_free_at_end
- // But that means we'll "eat-up" the untouched area faster, increasing the working set
- // So we just return what we have and just that
- szone->num_tiny_objects += found;
- szone->num_bytes_in_tiny_objects += chunk_size * found;
+
+ // We must lock the zone now, since tiny_malloc_from_free_list assumes that
+ // the caller has done so.
+ SZONE_LOCK(szone);
+
+ // with the zone locked, allocate objects from the free list until all
+ // sufficiently large objects have been exhausted, or we have met our quota
+ // of objects to allocate.
+ while (found < count) {
+ void *ptr = tiny_malloc_from_free_list(szone, msize);
+ if (!ptr)
+ break;
+
+ *results++ = ptr;
+ found++;
+ }
SZONE_UNLOCK(szone);
- // malloc_printf("In szone_batch_malloc(%d, %d) -> %d\n", size, count, found);
return found;
}
-void
-szone_batch_free(szone_t *szone, void **to_be_freed, unsigned count) {
+static void
+szone_batch_free(szone_t *szone, void **to_be_freed, unsigned count)
+{
+ unsigned cc = 0;
+ void *ptr;
+ region_t *tiny_region;
+ boolean_t is_free;
+ msize_t msize;
+
// frees all the pointers in to_be_freed
// note that to_be_freed may be overwritten during the process
- if (!count) return;
- // malloc_printf("Freeing %d items\n", count);
- unsigned cc = 0;
+ if (!count)
+ return;
CHECK(szone, __PRETTY_FUNCTION__);
SZONE_LOCK(szone);
while (cc < count) {
- void *ptr = to_be_freed[cc];
- tiny_region_t *tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
- if (tiny_region) {
- // this is a tiny pointer
- boolean_t is_free;
- msize_t msize = get_tiny_meta_header(ptr, &is_free);
- if (is_free) break; // a double free; let the standard free deal with it
- tiny_free_no_lock(szone, tiny_region, ptr, msize);
- to_be_freed[cc] = NULL;
+ ptr = to_be_freed[cc];
+ if (ptr) {
+ /* XXX this really slows us down */
+ tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
+ if (tiny_region) {
+ // this is a tiny pointer
+ if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS)
+ break; // pointer to metadata; let the standard free deal with it
+ msize = get_tiny_meta_header(ptr, &is_free);
+ if (is_free)
+ break; // a double free; let the standard free deal with it
+ tiny_free_no_lock(szone, tiny_region, ptr, msize);
+ to_be_freed[cc] = NULL;
+ }
}
cc++;
}
SZONE_UNLOCK(szone);
CHECK(szone, __PRETTY_FUNCTION__);
while (count--) {
- void *ptr = to_be_freed[count];
- // malloc_printf("Freeing item at %d: %p\n", count, ptr);
- if (ptr) szone_free(szone, ptr);
+ ptr = to_be_freed[count];
+ if (ptr)
+ szone_free(szone, ptr);
}
}
static void
-szone_destroy(szone_t *szone) {
- unsigned index;
- small_region_t pended_region = 0;
+szone_destroy(szone_t *szone)
+{
+ size_t index;
+ large_entry_t *large;
+ vm_range_t range_to_deallocate;
+ huge_entry_t *huge;
+
+ /* destroy large entries */
index = szone->num_large_entries;
while (index--) {
- large_entry_t *entry = szone->large_entries + index;
- if (!LARGE_ENTRY_IS_EMPTY(*entry)) {
- large_entry_t range;
- range = *entry;
+ large = szone->large_entries + index;
+ if (!LARGE_ENTRY_IS_EMPTY(*large)) {
// we deallocate_pages, including guard pages
- deallocate_pages(szone, LARGE_ENTRY_ADDRESS(range), LARGE_ENTRY_SIZE(range), szone->debug_flags);
+ deallocate_pages(szone, (void *)LARGE_ENTRY_ADDRESS(*large), LARGE_ENTRY_SIZE(*large), szone->debug_flags);
}
}
if (szone->num_large_entries * sizeof(large_entry_t) >= LARGE_THRESHOLD) {
- vm_range_t range_to_deallocate;
- large_entries_free_no_lock(szone, szone->large_entries, szone->num_large_entries, &range_to_deallocate); // we do not free in the small chunk case
- if (range_to_deallocate.size) deallocate_pages(szone, range_to_deallocate.address, range_to_deallocate.size, 0);
-
- }
+ // we do not free in the small chunk case
+ large_entries_free_no_lock(szone, szone->large_entries, szone->num_large_entries, &range_to_deallocate);
+ if (range_to_deallocate.size)
+ deallocate_pages(szone, (void *)range_to_deallocate.address, (size_t)range_to_deallocate.size, 0);
+ }
+
+ /* destroy huge entries */
index = szone->num_huge_entries;
while (index--) {
- huge_entry_t *huge = szone->huge_entries + index;
- deallocate_pages(szone, huge->address, huge->size, szone->debug_flags);
- }
- // the tiny regions
- index = szone->num_tiny_regions;
- while (index--) {
- tiny_region_t tiny_region = szone->tiny_regions[index];
- vm_size_t size_allocated = ((TINY_REGION_SIZE + (1 << vm_page_shift) - 1) >> vm_page_shift) << vm_page_shift;
- deallocate_pages(szone, TINY_REGION_ADDRESS(tiny_region), size_allocated, 0);
- }
- // and now we free regions, with regions[0] as the last one (the final harakiri)
- index = szone->num_small_regions;
- while (index--) {
- small_region_t region = szone->small_regions[index];
- if (index > 0
- && (void *)szone->small_regions >= (void *)(SMALL_REGION_ADDRESS(region))
- && (void *)szone->small_regions < (void *)(SMALL_REGION_END(region))) {
- // Pend deallocation of this region, since the region
- // bookkeeping array is in it.
- pended_region = region;
- } else {
- deallocate_pages(szone, SMALL_REGION_ADDRESS(region), SMALL_REGION_SIZE, 0);
- }
- }
- if (pended_region) {
- deallocate_pages(szone, SMALL_REGION_ADDRESS(pended_region), SMALL_REGION_SIZE, 0);
- }
+ huge = szone->huge_entries + index;
+ deallocate_pages(szone, (void *)huge->address, huge->size, szone->debug_flags);
+ }
+
+ /* destroy tiny regions */
+ for (index = 0; index < szone->num_tiny_regions_allocated; ++index)
+ if (szone->tiny_regions[index])
+ deallocate_pages(szone, szone->tiny_regions[index], TINY_REGION_SIZE, 0);
+
+ /* destroy small regions */
+ for (index = 0; index < szone->num_small_regions_allocated; ++index)
+ if (szone->small_regions[index])
+ deallocate_pages(szone, szone->small_regions[index], SMALL_REGION_SIZE, 0);
+
+ /* destroy region hash rings, if any */
+ if (szone->tiny_regions != szone->initial_tiny_regions) {
+ size_t size = round_page(szone->num_tiny_regions_allocated * sizeof(region_t));
+ deallocate_pages(szone, szone->tiny_regions, size, 0);
+ }
+ if (szone->small_regions != szone->initial_small_regions) {
+ size_t size = round_page(szone->num_small_regions_allocated * sizeof(region_t));
+ deallocate_pages(szone, szone->small_regions, size, 0);
+ }
+ /* Now destroy the separate szone region */
+ deallocate_pages(szone, (void *)szone, SZONE_PAGED_SIZE, SCALABLE_MALLOC_ADD_GUARD_PAGES);
}
static size_t
-szone_good_size(szone_t *szone, size_t size) {
+szone_good_size(szone_t *szone, size_t size)
+{
+ msize_t msize;
+ unsigned num_pages;
+
if (size <= 31 * TINY_QUANTUM) {
// think tiny
- msize_t msize = (size + TINY_QUANTUM - 1) >> SHIFT_TINY_QUANTUM;
+ msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
if (! msize) msize = 1;
- return msize << SHIFT_TINY_QUANTUM;
+ return TINY_BYTES_FOR_MSIZE(msize);
}
if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (size < LARGE_THRESHOLD)) {
// think small
- msize_t msize = (size + SMALL_QUANTUM - 1) >> SHIFT_SMALL_QUANTUM;
+ msize = SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1);
if (! msize) msize = 1;
- return msize << SHIFT_SMALL_QUANTUM;
+ return SMALL_BYTES_FOR_MSIZE(msize);
} else {
- unsigned num_pages;
num_pages = round_page(size) >> vm_page_shift;
- if (!num_pages) num_pages = 1; // minimal allocation size for this
+ if (!num_pages)
+ num_pages = 1; // minimal allocation size for this
return num_pages << vm_page_shift;
}
}
@@ -2818,93 +3770,92 @@
unsigned szone_check_modulo = 1;
static boolean_t
-szone_check_all(szone_t *szone, const char *function) {
- unsigned index = 0;
+szone_check_all(szone_t *szone, const char *function)
+{
+ size_t index;
+
SZONE_LOCK(szone);
CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- while (index < szone->num_tiny_regions) {
- tiny_region_t *region = szone->tiny_regions + index++;
- if (! szone_check_tiny_region(szone, region)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- malloc_printf("*** malloc[%d]: Tiny region %d incorrect szone_check_all(%s) counter=%d\n", getpid(), index-1, function, szone_check_counter);
- szone_error(szone, "Check: tiny region incorrect", NULL);
- return 0;
- }
- }
-
- index = 0;
- while (index < NUM_TINY_SLOTS) {
- if (! tiny_free_list_check(szone, index)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- malloc_printf("*** malloc[%d]: Tiny free list incorrect (slot=%d) szone_check_all(%s) counter=%d\n", getpid(), index, function, szone_check_counter);
- szone_error(szone, "Check: tiny free list incorrect", NULL);
- return 0;
- }
- index++;
- }
-
- index = 0; while (index < szone->num_small_regions) {
- small_region_t *region = szone->small_regions + index++;
- if (! szone_check_small_region(szone, region)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- malloc_printf("*** malloc[%d]: Small region %d incorrect szone_check_all(%s) counter=%d\n", getpid(), index-1, function, szone_check_counter);
- szone_error(szone, "Check: small region incorrect", NULL);
- return 0;
- }
- }
- index = 0;
- while (index < NUM_SMALL_SLOTS) {
- if (! small_free_list_check(szone, index)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- malloc_printf("*** malloc[%d]: Small free list incorrect (grain=%d) szone_check_all(%s) counter=%d\n", getpid(), index, function, szone_check_counter);
- szone_error(szone, "Check: small free list incorrect", NULL);
- return 0;
- }
- index++;
+
+ /* check tiny regions - chould check region count */
+ for (index = 0; index < szone->num_tiny_regions_allocated; ++index) {
+ region_t tiny = szone->tiny_regions[index];
+ if (tiny && !tiny_check_region(szone, tiny)) {
+ SZONE_UNLOCK(szone);
+ szone->debug_flags &= ~ CHECK_REGIONS;
+ szone_error(szone, "check: tiny region incorrect", NULL,
+ "*** tiny region %d incorrect szone_check_all(%s) counter=%d\n",
+ index, function, szone_check_counter);
+ return 0;
+ }
+ }
+ /* check tiny free lists */
+ for (index = 0; index < NUM_TINY_SLOTS; ++index) {
+ if (!tiny_free_list_check(szone, index)) {
+ SZONE_UNLOCK(szone);
+ szone->debug_flags &= ~ CHECK_REGIONS;
+ szone_error(szone, "check: tiny free list incorrect", NULL,
+ "*** tiny free list incorrect (slot=%d) szone_check_all(%s) counter=%d\n",
+ index, function, szone_check_counter);
+ return 0;
+ }
+ }
+ /* check small regions - could check region count */
+ for (index = 0; index < szone->num_small_regions_allocated; ++index) {
+ region_t small = szone->small_regions[index];
+ if (small && !szone_check_small_region(szone, small)) {
+ SZONE_UNLOCK(szone);
+ szone->debug_flags &= ~ CHECK_REGIONS;
+ szone_error(szone, "check: small region incorrect", NULL,
+ "*** small region %d incorrect szone_check_all(%s) counter=%d\n",
+ index, function, szone_check_counter);
+ return 0;
+ }
+ }
+ /* check small free lists */
+ for (index = 0; index < NUM_SMALL_SLOTS; ++index) {
+ if (!small_free_list_check(szone, index)) {
+ SZONE_UNLOCK(szone);
+ szone->debug_flags &= ~ CHECK_REGIONS;
+ szone_error(szone, "check: small free list incorrect", NULL,
+ "*** small free list incorrect (grain=%d) szone_check_all(%s) counter=%d\n",
+ index, function, szone_check_counter);
+ return 0;
+ }
}
SZONE_UNLOCK(szone);
- // szone_print(szone, 1);
return 1;
}
static boolean_t
-szone_check(szone_t *szone) {
- if (! (++szone_check_counter % 10000)) {
- malloc_printf("At szone_check counter=%d\n", szone_check_counter);
- }
- if (szone_check_counter < szone_check_start) return 1;
- if (szone_check_counter % szone_check_modulo) return 1;
+szone_check(szone_t *szone)
+{
+ if ((++szone_check_counter % 10000) == 0)
+ _malloc_printf(ASL_LEVEL_NOTICE, "at szone_check counter=%d\n", szone_check_counter);
+ if (szone_check_counter < szone_check_start)
+ return 1;
+ if (szone_check_counter % szone_check_modulo)
+ return 1;
return szone_check_all(szone, "");
}
static kern_return_t
-szone_ptr_in_use_enumerator(task_t task, void *context,
- unsigned type_mask, vm_address_t zone_address, memory_reader_t reader,
- vm_range_recorder_t recorder) {
+szone_ptr_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder)
+{
szone_t *szone;
kern_return_t err;
+
if (!reader) reader = _szone_default_reader;
-// malloc_printf("Enumerator for zone %p\n", zone_address);
err = reader(task, zone_address, sizeof(szone_t), (void **)&szone);
if (err) return err;
-// malloc_printf("Tiny ptrs enumeration for zone %p\n", zone_address);
- err = tiny_in_use_enumerator(task, context, type_mask,
- (vm_address_t)szone->tiny_regions, szone->num_tiny_regions, szone->tiny_bytes_free_at_end , reader, recorder);
+ err = tiny_in_use_enumerator(task, context, type_mask, szone, reader, recorder);
if (err) return err;
-// malloc_printf("Small ptrs enumeration for zone %p\n", zone_address);
- err = small_in_use_enumerator(task, context, type_mask,
- (vm_address_t)szone->small_regions, szone->num_small_regions, szone->small_bytes_free_at_end , reader, recorder);
+ err = small_in_use_enumerator(task, context, type_mask, szone, reader, recorder);
if (err) return err;
-// malloc_printf("Large ptrs enumeration for zone %p\n", zone_address);
err = large_in_use_enumerator(task, context, type_mask,
(vm_address_t)szone->large_entries, szone->num_large_entries, reader,
recorder);
if (err) return err;
-// malloc_printf("Huge ptrs enumeration for zone %p\n", zone_address);
err = huge_in_use_enumerator(task, context, type_mask,
(vm_address_t)szone->huge_entries, szone->num_huge_entries, reader,
recorder);
@@ -2913,9 +3864,11 @@
// Following method is deprecated: use scalable_zone_statistics instead
void
-scalable_zone_info(malloc_zone_t *zone, unsigned *info_to_fill, unsigned count) {
+scalable_zone_info(malloc_zone_t *zone, unsigned *info_to_fill, unsigned count)
+{
szone_t *szone = (void *)zone;
unsigned info[13];
+
// We do not lock to facilitate debug
info[4] = szone->num_tiny_objects;
info[5] = szone->num_bytes_in_tiny_objects;
@@ -2934,54 +3887,71 @@
}
static void
-szone_print(szone_t *szone, boolean_t verbose) {
- unsigned info[13];
- unsigned index = 0;
+szone_print(szone_t *szone, boolean_t verbose)
+{
+ unsigned info[13];
+ size_t index;
+ region_t region;
+
+ SZONE_LOCK(szone);
+ scalable_zone_info((void *)szone, info, 13);
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
+ "Scalable zone %p: inUse=%d(%y) touched=%y allocated=%y flags=%d\n",
+ szone, info[0], info[1], info[2], info[3], info[12]);
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
+ "\ttiny=%d(%y) small=%d(%y) large=%d(%y) huge=%d(%y)\n",
+ info[4], info[5], info[6], info[7], info[8], info[9], info[10], info[11]);
+ // tiny
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
+ "%d tiny regions:\n", szone->num_tiny_regions);
+ for (index = 0; index < szone->num_tiny_regions_allocated; ++index) {
+ region = szone->tiny_regions[index];
+ if (region)
+ print_tiny_region(verbose, region, (region == szone->last_tiny_region) ?
+ szone->tiny_bytes_free_at_end : 0);
+ }
+ if (verbose)
+ print_tiny_free_list(szone);
+ // small
+ _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
+ "%d small regions:\n", szone->num_small_regions);
+ for (index = 0; index < szone->num_small_regions_allocated; ++index) {
+ region = szone->small_regions[index];
+ if (region)
+ print_small_region(szone, verbose, region,
+ (region == szone->last_small_region) ?
+ szone->small_bytes_free_at_end : 0);
+ }
+ if (verbose)
+ print_small_free_list(szone);
+ SZONE_UNLOCK(szone);
+}
+
+static void
+szone_log(malloc_zone_t *zone, void *log_address)
+{
+ szone_t *szone = (szone_t *)zone;
+
+ szone->log_address = log_address;
+}
+
+static void
+szone_force_lock(szone_t *szone)
+{
SZONE_LOCK(szone);
- scalable_zone_info((void *)szone, info, 13);
- malloc_printf("Scalable zone %p: inUse=%d(%y) touched=%y allocated=%y flags=%d\n", szone, info[0], info[1], info[2], info[3], info[12]);
- malloc_printf("\ttiny=%d(%y) small=%d(%y) large=%d(%y) huge=%d(%y)\n", info[4], info[5], info[6], info[7], info[8], info[9], info[10], info[11]);
- // tiny
- malloc_printf("%d tiny regions: \n", szone->num_tiny_regions);
- while (index < szone->num_tiny_regions) {
- tiny_region_t *region = szone->tiny_regions + index;
- print_tiny_region(verbose, *region, (index == szone->num_tiny_regions - 1) ? szone->tiny_bytes_free_at_end : 0);
- index++;
- }
- if (verbose) print_tiny_free_list(szone);
- // small
- malloc_printf("%d small regions: \n", szone->num_small_regions);
- index = 0;
- while (index < szone->num_small_regions) {
- small_region_t *region = szone->small_regions + index;
- print_small_region(szone, verbose, region, (index == szone->num_small_regions - 1) ? szone->small_bytes_free_at_end : 0);
- index++;
- }
- if (verbose) print_small_free_list(szone);
+}
+
+static void
+szone_force_unlock(szone_t *szone)
+{
SZONE_UNLOCK(szone);
}
-static void
-szone_log(malloc_zone_t *zone, void *log_address) {
- szone_t *szone = (void *)zone;
- szone->log_address = log_address;
-}
-
-static void
-szone_force_lock(szone_t *szone) {
-// malloc_printf("szone_force_lock\n");
- SZONE_LOCK(szone);
-}
-
-static void
-szone_force_unlock(szone_t *szone) {
-// malloc_printf("szone_force_unlock\n");
- SZONE_UNLOCK(szone);
-}
-
boolean_t
-scalable_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats, unsigned subzone) {
- szone_t *szone = (void *)zone;
+scalable_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats, unsigned subzone)
+{
+ szone_t *szone = (szone_t *)zone;
+
switch (subzone) {
case 0:
stats->blocks_in_use = szone->num_tiny_objects;
@@ -3010,11 +3980,22 @@
}
static void
-szone_statistics(szone_t *szone, malloc_statistics_t *stats) {
- stats->blocks_in_use = szone->num_tiny_objects + szone->num_small_objects + szone->num_large_objects_in_use + szone->num_huge_entries;
- size_t big_and_huge = szone->num_bytes_in_large_objects + szone->num_bytes_in_huge_objects;
+szone_statistics(szone_t *szone, malloc_statistics_t *stats)
+{
+ size_t big_and_huge;
+
+ stats->blocks_in_use =
+ szone->num_tiny_objects +
+ szone->num_small_objects +
+ szone->num_large_objects_in_use +
+ szone->num_huge_entries;
+ big_and_huge = szone->num_bytes_in_large_objects + szone->num_bytes_in_huge_objects;
stats->size_in_use = szone->num_bytes_in_tiny_objects + szone->num_bytes_in_small_objects + big_and_huge;
- stats->max_size_in_use = stats->size_allocated = szone->num_tiny_regions * TINY_REGION_SIZE + szone->num_small_regions * SMALL_REGION_SIZE + big_and_huge ;
+ stats->max_size_in_use = stats->size_allocated =
+ szone->num_tiny_regions * TINY_REGION_SIZE +
+ szone->num_small_regions * SMALL_REGION_SIZE +
+ big_and_huge ;
+
// Now we account for the untouched areas
stats->max_size_in_use -= szone->tiny_bytes_free_at_end;
stats->max_size_in_use -= szone->small_bytes_free_at_end;
@@ -3032,36 +4013,33 @@
}; // marked as const to spare the DATA section
malloc_zone_t *
-create_scalable_zone(size_t initial_size, unsigned debug_flags) {
+create_scalable_zone(size_t initial_size, unsigned debug_flags)
+{
szone_t *szone;
- vm_address_t addr;
- size_t msize;
- size_t msize_used = 0;
- // malloc_printf("=== create_scalable_zone(%d,%d) - %s\n", initial_size, debug_flags, (DEBUG_MALLOC) ? "**** DEBUG" : "");
-#if PAGE_SIZE_FIXED
- if ((1 << vm_page_shift) == vm_page_size) {
- // malloc_printf("vm_page_shift validated to be %d\n", vm_page_shift);
- } else {
- malloc_printf("*** vm_page_shift incorrectly set to %d\n", vm_page_shift);
+
+ /*
+ * Sanity-check our build-time assumptions about the size of a page.
+ * Since we have sized various things assuming the default page size,
+ * attempting to determine it dynamically is not useful.
+ */
+ if ((vm_page_size != _vm_page_size) || (vm_page_shift != _vm_page_shift)) {
+ malloc_printf("*** FATAL ERROR - machine page size does not match our assumptions.\n");
exit(-1);
}
-#else
- if (!vm_page_shift) {
- unsigned page;
- vm_page_shift = 12; // the minimal for page sizes
- page = 1 << vm_page_shift;
- while (page != vm_page_size) { page += page; vm_page_shift++;};
- }
-#endif
- addr = allocate_pages(NULL, SMALL_REGION_SIZE, SMALL_BLOCKS_ALIGN, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC));
- if (!addr) return NULL;
- szone = (void *)addr;
- msize = (sizeof(szone_t) + SMALL_QUANTUM - 1) >> SHIFT_SMALL_QUANTUM;
- // malloc_printf("sizeof(szone_t)=%d msize for 1st block=%d; wasted %d bytes\n", sizeof(szone_t), msize, (msize << SHIFT_SMALL_QUANTUM) - sizeof(szone_t));
- small_meta_header(szone)[0] = msize;
+
+ /* get memory for the zone, which is now separate from any region.
+ add guard pages to prevent walking from any other vm allocations
+ to here and overwriting the function pointers in basic_zone. */
+ szone = allocate_pages(NULL, SZONE_PAGED_SIZE, 0,
+ SCALABLE_MALLOC_ADD_GUARD_PAGES,
+ VM_MEMORY_MALLOC);
+ if (!szone)
+ return NULL;
+ /* set up the szone structure */
szone->tiny_regions = szone->initial_tiny_regions;
szone->small_regions = szone->initial_small_regions;
- msize_used += msize; szone->num_small_objects++;
+ szone->num_tiny_regions_allocated = INITIAL_NUM_REGIONS;
+ szone->num_small_regions_allocated = INITIAL_NUM_REGIONS;
szone->basic_zone.version = 3;
szone->basic_zone.size = (void *)szone_size;
szone->basic_zone.malloc = (void *)szone_malloc;
@@ -3073,7 +4051,9 @@
szone->basic_zone.batch_malloc = (void *)szone_batch_malloc;
szone->basic_zone.batch_free = (void *)szone_batch_free;
szone->basic_zone.introspect = (struct malloc_introspection_t *)&szone_introspect;
+ szone->debug_flags = debug_flags;
LOCK_INIT(szone->lock);
+
#if 0
#warning CHECK_REGIONS enabled
debug_flags |= CHECK_REGIONS;
@@ -3082,16 +4062,7 @@
#warning LOG enabled
szone->log_address = ~0;
#endif
- szone->debug_flags = debug_flags;
- szone->small_regions[0] = addr >> SMALL_BLOCKS_ALIGN;
- szone->num_small_regions = 1;
- msize_t free_msize = NUM_SMALL_BLOCKS - msize;
- small_meta_header(szone)[msize] = free_msize;
- szone->small_bytes_free_at_end = free_msize << SHIFT_SMALL_QUANTUM;
CHECK(szone, __PRETTY_FUNCTION__);
-#if 0
- write(1, "Malloc szone created\n", 23);
-#endif
return (malloc_zone_t *)szone;
}
@@ -3108,12 +4079,14 @@
* malloc does not store flags in front of large page-aligned allocations.
* 3) Original szone-based freezedrying code.
* 4) Fresher malloc with tiny zone
+ * 5) 32/64bit compatible malloc
+ * 6) Metadata within 1MB and 8MB region for tiny and small
*
* No version backward compatibility is provided, but the version number does
* make it possible for malloc_jumpstart() to return an error if the application
* was freezedried with an older version of malloc.
*/
-#define MALLOC_FREEZEDRY_VERSION 4
+#define MALLOC_FREEZEDRY_VERSION 6
typedef struct {
unsigned version;
@@ -3122,24 +4095,29 @@
} malloc_frozen;
static void *
-frozen_malloc(szone_t *zone, size_t new_size) {
+frozen_malloc(szone_t *zone, size_t new_size)
+{
return malloc(new_size);
}
static void *
-frozen_calloc(szone_t *zone, size_t num_items, size_t size) {
+frozen_calloc(szone_t *zone, size_t num_items, size_t size)
+{
return calloc(num_items, size);
}
static void *
-frozen_valloc(szone_t *zone, size_t new_size) {
+frozen_valloc(szone_t *zone, size_t new_size)
+{
return valloc(new_size);
}
static void *
-frozen_realloc(szone_t *zone, void *ptr, size_t new_size) {
+frozen_realloc(szone_t *zone, void *ptr, size_t new_size)
+{
size_t old_size = szone_size(zone, ptr);
void *new_ptr;
+
if (new_size <= old_size) {
return ptr;
}
@@ -3151,11 +4129,13 @@
}
static void
-frozen_free(szone_t *zone, void *ptr) {
+frozen_free(szone_t *zone, void *ptr)
+{
}
static void
-frozen_destroy(szone_t *zone) {
+frozen_destroy(szone_t *zone)
+{
}
/********* Pseudo-private API for emacs unexec ************/
@@ -3173,8 +4153,9 @@
* returns 0 (error) if any non-szone zones are encountered.
*/
-int
-malloc_freezedry(void) {
+uintptr_t
+malloc_freezedry(void)
+{
extern unsigned malloc_num_zones;
extern malloc_zone_t **malloc_zones;
malloc_frozen *data;
@@ -3190,9 +4171,11 @@
data->nszones = malloc_num_zones;
data->szones = (szone_t *) calloc(malloc_num_zones, sizeof(szone_t));
- /* Fill in the array of szone structures. They are copied rather than
+ /*
+ * Fill in the array of szone structures. They are copied rather than
* referenced, since the originals are likely to be clobbered during malloc
- * initialization. */
+ * initialization.
+ */
for (i = 0; i < malloc_num_zones; i++) {
if (strcmp(malloc_zones[i]->zone_name, "DefaultMallocZone")) {
/* Unknown zone type. */
@@ -3203,12 +4186,13 @@
memcpy(&data->szones[i], malloc_zones[i], sizeof(szone_t));
}
- return (int) data;
+ return((uintptr_t)data);
}
int
-malloc_jumpstart(int cookie) {
- malloc_frozen *data = (malloc_frozen *) cookie;
+malloc_jumpstart(uintptr_t cookie)
+{
+ malloc_frozen *data = (malloc_frozen *)cookie;
unsigned i;
if (data->version != MALLOC_FREEZEDRY_VERSION) {
@@ -3235,3 +4219,4 @@
return 0;
}
+