--- /dev/null
+++ libmalloc/libmalloc-283/tests/MallocBenchTest/MALLOC_BENCH/MallocBench/Memory.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Memory.h"
+#include <iostream>
+#include <stdlib.h>
+
+#ifdef __APPLE__
+#include <mach/mach.h>
+#include <mach/task_info.h>
+#else
+#include <stdio.h>
+#include <unistd.h>
+#endif
+
+Memory currentMemoryBytes()
+{
+    Memory memory;
+
+#ifdef __APPLE__
+    task_vm_info_data_t vm_info;
+    mach_msg_type_number_t vm_size = TASK_VM_INFO_COUNT;
+    if (KERN_SUCCESS != task_info(mach_task_self(), TASK_VM_INFO_PURGEABLE, (task_info_t)(&vm_info), &vm_size)) {
+        std::cout << "Failed to get mach task info" << std::endl;
+        exit(1);
+    }
+
+    memory.resident = vm_info.internal + vm_info.compressed - vm_info.purgeable_volatile_pmap;
+    memory.residentMax = vm_info.resident_size_peak;
+#else
+    FILE* file = fopen("/proc/self/status", "r");
+
+    auto forEachLine = [] (FILE* file, auto functor) {
+        char* buffer = nullptr;
+        size_t size = 0;
+        while (getline(&buffer, &size, file) != -1) {
+            functor(buffer, size);
+            ::free(buffer); // Be careful. getline's memory allocation is done by system malloc.
+            buffer = nullptr;
+            size = 0;
+        }
+    };
+
+    unsigned long vmHWM = 0;
+    unsigned long vmRSS = 0;
+    unsigned long rssFile = 0;
+    unsigned long rssShmem = 0;
+    forEachLine(file, [&] (char* buffer, size_t) {
+        unsigned long sizeInKB = 0;
+        if (sscanf(buffer, "VmHWM: %lu kB", &sizeInKB) == 1)
+            vmHWM = sizeInKB * 1024;
+        else if (sscanf(buffer, "VmRSS: %lu kB", &sizeInKB) == 1)
+            vmRSS = sizeInKB * 1024;
+        else if (sscanf(buffer, "RssFile: %lu kB", &sizeInKB) == 1)
+            rssFile = sizeInKB * 1024;
+        else if (sscanf(buffer, "RssShmem: %lu kB", &sizeInKB) == 1)
+            rssShmem = sizeInKB * 1024;
+    });
+    fclose(file);
+    memory.resident = vmRSS - (rssFile + rssShmem);
+    memory.residentMax = vmHWM - (rssFile + rssShmem); // We do not have any way to get the peak of RSS of anonymous pages. Here, we subtract RSS of files and shmem to estimate the peak of RSS of anonymous pages.
+#endif
+    return memory;
+}