--- libmalloc/libmalloc-317.121.1/tests/perf_realloc.c
+++ /dev/null
@@ -1,170 +0,0 @@
-#include <stdlib.h>
-#include <mach/vm_page_size.h>
-#include <../src/internal.h>
-#include <darwintest.h>
-#include <perfcheck_keys.h>
-
-#pragma mark -
-#pragma mark Helper code
-
-#define PAGE_SPREAD 8
-#define MAX_NAME_SIZE 256
-#define OUTLIER_TIME 20000
-
-// This value is a guess that will be refined over time.
-#define PERFCHECK_THRESHOLD_PCT	10.0
-
-static char name[MAX_NAME_SIZE];
-#define NUMBER_OF_SAMPLES_FOR_BATCH(s) _dt_stat_batch_size((dt_stat_t)s)
-
-// Measures the time required to realloc a block of memory of given size
-// by a specified amount.
-static void
-realloc_by_amount(const char *base_metric_name, size_t size, ssize_t amount,
-		bool amount_is_random)
-{
-	if (amount_is_random) {
-		snprintf(name, MAX_NAME_SIZE, amount >= 0 ?
-			 "%s_from_%llu_up_random" : "%s_from_%llu_down_random",
-			 base_metric_name, (uint64_t)size);
-	} else {
-		snprintf(name, MAX_NAME_SIZE, amount >= 0 ?
-				 "%s_from_%llu_up_%ld" : "%s_from_%llu_down_%ld",
-				 base_metric_name, (uint64_t)size, labs(amount));
-	}
-
-	uint64_t total_time = 0;
-	int count = 0;
-	dt_stat_time_t s = dt_stat_time_create(name);
-	dt_stat_set_variable((dt_stat_t)s, "size (bytes)", (unsigned int)size);
-	dt_stat_set_variable((dt_stat_t)s, "amount (bytes)", (int)amount);
-	dt_stat_token now = dt_stat_time_begin(s);
-
-	for (;;) {
-		void *ptr = malloc(size);
-		T_QUIET; T_ASSERT_NOTNULL(ptr, "malloc for size %llu failed", (uint64_t)size);
-
-		dt_stat_token start = dt_stat_time_begin(s);
-		ptr = realloc(ptr, size + amount);
-		dt_stat_token end = dt_stat_time_begin(s);
-		T_QUIET; T_ASSERT_NOTNULL(ptr,
-				"realloc from size %llu to size %llu failed", (uint64_t)size,
-				(uint64_t)(size + amount));
-		total_time += end - start;
-		free(ptr);
-
-		if (++count >= NUMBER_OF_SAMPLES_FOR_BATCH(s)) {
-			// Discard outliers or the test won't converge -- this should
-			// be done in libdarwintest
-			if (total_time/count < OUTLIER_TIME) {
-				dt_stat_mach_time_add_batch(s, count, total_time);
-			}
-			total_time = 0;
-			count = 0;
-			if (dt_stat_stable(s)) {
-				break;
-			}
-		}
-	}
-
-	dt_stat_finalize(s);
-}
-
-// Times a set of size adjustments from a given base.
-static void
-realloc_test_set(const char *base_name, size_t start_size)
-{
-	ssize_t adj = 1;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -adj, false);
-
-	adj = 8;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -adj, false);
-
-	adj = 16;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -adj, false);
-
-#if INCLUDE_RANDOM_SIZE_TESTS
-	adj = 1 + arc4random_uniform(vm_page_size - 1);
-	realloc_by_amount(base_name, start_size, adj, true);
-	realloc_by_amount(base_name, start_size + adj, -adj, true);
-
-	uint32_t pages = 1 + arc4random_uniform(PAGE_SPREAD);
-	adj = pages * vm_page_size;
-	realloc_by_amount(base_name, start_size, adj, true);
-	realloc_by_amount(base_name, start_size + adj, -adj, true);
-#else // INCLUDE_RANDOM_SIZE_TESTS
-	T_LOG("Skipping random size tests");
-#endif // INCLUDE_RANDOM_SIZE_TESTS
-
-	adj = vm_page_size;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -adj, false);
-
-	adj = 4 * vm_page_size;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -adj, false);
-
-	// Adjust up and then down by over half the size of the allocation --
-	// this skips the fast path in some allocators.
-	adj = 4 * vm_page_size;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -(((ssize_t)start_size) + adj)/2 - 1, false);
-
-	adj = 32;
-	realloc_by_amount(base_name, start_size, adj, false);
-	realloc_by_amount(base_name, start_size + adj, -(((ssize_t)start_size) + adj)/2 - 1, false);
-}
-
-static void
-realloc_tests(const char *base_name, boolean_t using_nano)
-{
-	// tiny or nano
-	realloc_test_set(using_nano ? base_name : "Tiny", 8);
-
-	if (!using_nano) {
-		// No point in running these tests three times.
-
-		// tiny
-		realloc_test_set("Tiny", 512);
-
-		// small
-		realloc_test_set("Small", 2048);
-
-		// large
-		realloc_test_set("Large", 128 * 1024);
-	}
-
-	T_END;
-}
-
-#pragma mark -
-#pragma mark Tests for realloc()
-
-T_DECL(realloc_perf_base, "realloc without nano",
-	   T_META_TAG_PERF, T_META_ENVVAR("MallocNanoZone=0"))
-{
-	realloc_tests("NoNano", false);
-}
-
-T_DECL(realloc_perf_nanov1, "realloc with nanoV1",
-	   T_META_TAG_PERF, T_META_ENVVAR("MallocNanoZone=V1"))
-{
-#if CONFIG_NANOZONE
-	realloc_tests("Nanov1", true);
-#else // CONFIG_NANOZONE
-	T_SKIP("Nano allocator not configured");
-#endif // CONFIG_NANOZONE
-}
-
-T_DECL(realloc_perf_nanov2, "realloc with nanoV2",
-	   T_META_TAG_PERF, T_META_ENVVAR("MallocNanoZone=V2"))
-{
-#if CONFIG_NANOZONE
-	realloc_tests("Nanov2", true);
-#else // CONFIG_NANOZONE
-	T_SKIP("Nano allocator not configured");
-#endif // CONFIG_NANOZONE
-}