--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/wrk/src/zmalloc.c	Thu Jan 22 20:10:30 2026 -0800
@@ -0,0 +1,411 @@
+/* zmalloc - total amount of allocated memory aware version of malloc()
+ *
+ * Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * 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.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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 <stdio.h>
+#include <stdlib.h>
+
+/* This function provide us access to the original libc free(). This is useful
+ * for instance to free results obtained by backtrace_symbols(). We need
+ * to define this function before including zmalloc.h that may shadow the
+ * free implementation if we use jemalloc or another non standard allocator. */
+void zlibc_free(void *ptr) {
+    free(ptr);
+}
+
+#include <string.h>
+#include <pthread.h>
+#include "config.h"
+#include "zmalloc.h"
+#include "atomicvar.h"
+
+#ifdef HAVE_MALLOC_SIZE
+#define PREFIX_SIZE (0)
+#else
+#if defined(__sun) || defined(__sparc) || defined(__sparc__)
+#define PREFIX_SIZE (sizeof(long long))
+#else
+#define PREFIX_SIZE (sizeof(size_t))
+#endif
+#endif
+
+/* Explicitly override malloc/free etc when using tcmalloc. */
+#if defined(USE_TCMALLOC)
+#define malloc(size) tc_malloc(size)
+#define calloc(count,size) tc_calloc(count,size)
+#define realloc(ptr,size) tc_realloc(ptr,size)
+#define free(ptr) tc_free(ptr)
+#elif defined(USE_JEMALLOC)
+#define malloc(size) je_malloc(size)
+#define calloc(count,size) je_calloc(count,size)
+#define realloc(ptr,size) je_realloc(ptr,size)
+#define free(ptr) je_free(ptr)
+#define mallocx(size,flags) je_mallocx(size,flags)
+#define dallocx(ptr,flags) je_dallocx(ptr,flags)
+#endif
+
+#define update_zmalloc_stat_alloc(__n) do { \
+    size_t _n = (__n); \
+    if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
+    atomicIncr(used_memory,__n); \
+} while(0)
+
+#define update_zmalloc_stat_free(__n) do { \
+    size_t _n = (__n); \
+    if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
+    atomicDecr(used_memory,__n); \
+} while(0)
+
+static size_t used_memory = 0;
+pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static void zmalloc_default_oom(size_t size) {
+    fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
+        size);
+    fflush(stderr);
+    abort();
+}
+
+static void (*zmalloc_oom_handler)(size_t) = zmalloc_default_oom;
+
+void *zmalloc(size_t size) {
+    void *ptr = malloc(size+PREFIX_SIZE);
+
+    if (!ptr) zmalloc_oom_handler(size);
+#ifdef HAVE_MALLOC_SIZE
+    update_zmalloc_stat_alloc(zmalloc_size(ptr));
+    return ptr;
+#else
+    *((size_t*)ptr) = size;
+    update_zmalloc_stat_alloc(size+PREFIX_SIZE);
+    return (char*)ptr+PREFIX_SIZE;
+#endif
+}
+
+/* Allocation and free functions that bypass the thread cache
+ * and go straight to the allocator arena bins.
+ * Currently implemented only for jemalloc. Used for online defragmentation. */
+#ifdef HAVE_DEFRAG
+void *zmalloc_no_tcache(size_t size) {
+    void *ptr = mallocx(size+PREFIX_SIZE, MALLOCX_TCACHE_NONE);
+    if (!ptr) zmalloc_oom_handler(size);
+    update_zmalloc_stat_alloc(zmalloc_size(ptr));
+    return ptr;
+}
+
+void zfree_no_tcache(void *ptr) {
+    if (ptr == NULL) return;
+    update_zmalloc_stat_free(zmalloc_size(ptr));
+    dallocx(ptr, MALLOCX_TCACHE_NONE);
+}
+#endif
+
+void *zcalloc(size_t size) {
+    void *ptr = calloc(1, size+PREFIX_SIZE);
+
+    if (!ptr) zmalloc_oom_handler(size);
+#ifdef HAVE_MALLOC_SIZE
+    update_zmalloc_stat_alloc(zmalloc_size(ptr));
+    return ptr;
+#else
+    *((size_t*)ptr) = size;
+    update_zmalloc_stat_alloc(size+PREFIX_SIZE);
+    return (char*)ptr+PREFIX_SIZE;
+#endif
+}
+
+void *zrealloc(void *ptr, size_t size) {
+#ifndef HAVE_MALLOC_SIZE
+    void *realptr;
+#endif
+    size_t oldsize;
+    void *newptr;
+
+    if (ptr == NULL) return zmalloc(size);
+#ifdef HAVE_MALLOC_SIZE
+    oldsize = zmalloc_size(ptr);
+    newptr = realloc(ptr,size);
+    if (!newptr) zmalloc_oom_handler(size);
+
+    update_zmalloc_stat_free(oldsize);
+    update_zmalloc_stat_alloc(zmalloc_size(newptr));
+    return newptr;
+#else
+    realptr = (char*)ptr-PREFIX_SIZE;
+    oldsize = *((size_t*)realptr);
+    newptr = realloc(realptr,size+PREFIX_SIZE);
+    if (!newptr) zmalloc_oom_handler(size);
+
+    *((size_t*)newptr) = size;
+    update_zmalloc_stat_free(oldsize);
+    update_zmalloc_stat_alloc(size);
+    return (char*)newptr+PREFIX_SIZE;
+#endif
+}
+
+/* Provide zmalloc_size() for systems where this function is not provided by
+ * malloc itself, given that in that case we store a header with this
+ * information as the first bytes of every allocation. */
+#ifndef HAVE_MALLOC_SIZE
+size_t zmalloc_size(void *ptr) {
+    void *realptr = (char*)ptr-PREFIX_SIZE;
+    size_t size = *((size_t*)realptr);
+    /* Assume at least that all the allocations are padded at sizeof(long) by
+     * the underlying allocator. */
+    if (size&(sizeof(long)-1)) size += sizeof(long)-(size&(sizeof(long)-1));
+    return size+PREFIX_SIZE;
+}
+#endif
+
+void zfree(void *ptr) {
+#ifndef HAVE_MALLOC_SIZE
+    void *realptr;
+    size_t oldsize;
+#endif
+
+    if (ptr == NULL) return;
+#ifdef HAVE_MALLOC_SIZE
+    update_zmalloc_stat_free(zmalloc_size(ptr));
+    free(ptr);
+#else
+    realptr = (char*)ptr-PREFIX_SIZE;
+    oldsize = *((size_t*)realptr);
+    update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
+    free(realptr);
+#endif
+}
+
+char *zstrdup(const char *s) {
+    size_t l = strlen(s)+1;
+    char *p = zmalloc(l);
+
+    memcpy(p,s,l);
+    return p;
+}
+
+size_t zmalloc_used_memory(void) {
+    size_t um;
+    atomicGet(used_memory,um);
+    return um;
+}
+
+void zmalloc_set_oom_handler(void (*oom_handler)(size_t)) {
+    zmalloc_oom_handler = oom_handler;
+}
+
+/* Get the RSS information in an OS-specific way.
+ *
+ * WARNING: the function zmalloc_get_rss() is not designed to be fast
+ * and may not be called in the busy loops where Redis tries to release
+ * memory expiring or swapping out objects.
+ *
+ * For this kind of "fast RSS reporting" usages use instead the
+ * function RedisEstimateRSS() that is a much faster (and less precise)
+ * version of the function. */
+
+#if defined(HAVE_PROC_STAT)
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+size_t zmalloc_get_rss(void) {
+    int page = sysconf(_SC_PAGESIZE);
+    size_t rss;
+    char buf[4096];
+    char filename[256];
+    int fd, count;
+    char *p, *x;
+
+    snprintf(filename,256,"/proc/%d/stat",getpid());
+    if ((fd = open(filename,O_RDONLY)) == -1) return 0;
+    if (read(fd,buf,4096) <= 0) {
+        close(fd);
+        return 0;
+    }
+    close(fd);
+
+    p = buf;
+    count = 23; /* RSS is the 24th field in /proc/<pid>/stat */
+    while(p && count--) {
+        p = strchr(p,' ');
+        if (p) p++;
+    }
+    if (!p) return 0;
+    x = strchr(p,' ');
+    if (!x) return 0;
+    *x = '\0';
+
+    rss = strtoll(p,NULL,10);
+    rss *= page;
+    return rss;
+}
+#elif defined(HAVE_TASKINFO)
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <mach/task.h>
+#include <mach/mach_init.h>
+
+size_t zmalloc_get_rss(void) {
+    task_t task = MACH_PORT_NULL;
+    struct task_basic_info t_info;
+    mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
+
+    if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS)
+        return 0;
+    task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
+
+    return t_info.resident_size;
+}
+#else
+size_t zmalloc_get_rss(void) {
+    /* If we can't get the RSS in an OS-specific way for this system just
+     * return the memory usage we estimated in zmalloc()..
+     *
+     * Fragmentation will appear to be always 1 (no fragmentation)
+     * of course... */
+    return zmalloc_used_memory();
+}
+#endif
+
+/* Fragmentation = RSS / allocated-bytes */
+float zmalloc_get_fragmentation_ratio(size_t rss) {
+    return (float)rss/zmalloc_used_memory();
+}
+
+/* Get the sum of the specified field (converted form kb to bytes) in
+ * /proc/self/smaps. The field must be specified with trailing ":" as it
+ * apperas in the smaps output.
+ *
+ * If a pid is specified, the information is extracted for such a pid,
+ * otherwise if pid is -1 the information is reported is about the
+ * current process.
+ *
+ * Example: zmalloc_get_smap_bytes_by_field("Rss:",-1);
+ */
+#if defined(HAVE_PROC_SMAPS)
+size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
+    char line[1024];
+    size_t bytes = 0;
+    int flen = strlen(field);
+    FILE *fp;
+
+    if (pid == -1) {
+        fp = fopen("/proc/self/smaps","r");
+    } else {
+        char filename[128];
+        snprintf(filename,sizeof(filename),"/proc/%ld/smaps",pid);
+        fp = fopen(filename,"r");
+    }
+
+    if (!fp) return 0;
+    while(fgets(line,sizeof(line),fp) != NULL) {
+        if (strncmp(line,field,flen) == 0) {
+            char *p = strchr(line,'k');
+            if (p) {
+                *p = '\0';
+                bytes += strtol(line+flen,NULL,10) * 1024;
+            }
+        }
+    }
+    fclose(fp);
+    return bytes;
+}
+#else
+size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
+    ((void) field);
+    ((void) pid);
+    return 0;
+}
+#endif
+
+size_t zmalloc_get_private_dirty(long pid) {
+    return zmalloc_get_smap_bytes_by_field("Private_Dirty:",pid);
+}
+
+/* Returns the size of physical memory (RAM) in bytes.
+ * It looks ugly, but this is the cleanest way to achive cross platform results.
+ * Cleaned up from:
+ *
+ * http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
+ *
+ * Note that this function:
+ * 1) Was released under the following CC attribution license:
+ *    http://creativecommons.org/licenses/by/3.0/deed.en_US.
+ * 2) Was originally implemented by David Robert Nadeau.
+ * 3) Was modified for Redis by Matt Stancliff.
+ * 4) This note exists in order to comply with the original license.
+ */
+size_t zmalloc_get_memory_size(void) {
+#if defined(__unix__) || defined(__unix) || defined(unix) || \
+    (defined(__APPLE__) && defined(__MACH__))
+#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
+    int mib[2];
+    mib[0] = CTL_HW;
+#if defined(HW_MEMSIZE)
+    mib[1] = HW_MEMSIZE;            /* OSX. --------------------- */
+#elif defined(HW_PHYSMEM64)
+    mib[1] = HW_PHYSMEM64;          /* NetBSD, OpenBSD. --------- */
+#endif
+    int64_t size = 0;               /* 64-bit */
+    size_t len = sizeof(size);
+    if (sysctl( mib, 2, &size, &len, NULL, 0) == 0)
+        return (size_t)size;
+    return 0L;          /* Failed? */
+
+#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
+    /* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
+    return (size_t)sysconf(_SC_PHYS_PAGES) * (size_t)sysconf(_SC_PAGESIZE);
+
+#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
+    /* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
+    int mib[2];
+    mib[0] = CTL_HW;
+#if defined(HW_REALMEM)
+    mib[1] = HW_REALMEM;        /* FreeBSD. ----------------- */
+#elif defined(HW_PYSMEM)
+    mib[1] = HW_PHYSMEM;        /* Others. ------------------ */
+#endif
+    unsigned int size = 0;      /* 32-bit */
+    size_t len = sizeof(size);
+    if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
+        return (size_t)size;
+    return 0L;          /* Failed? */
+#else
+    return 0L;          /* Unknown method to get the data. */
+#endif
+#else
+    return 0L;          /* Unknown OS. */
+#endif
+}
+
+