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-rw-r--r--src/zmalloc.c851
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diff --git a/src/zmalloc.c b/src/zmalloc.c
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+++ b/src/zmalloc.c
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+/* 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 "fmacros.h"
+#include "config.h"
+#include "solarisfixes.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <assert.h>
+
+#ifdef __linux__
+#include <sys/mman.h>
+#endif
+
+/* 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 "zmalloc.h"
+#include "atomicvar.h"
+
+#define UNUSED(x) ((void)(x))
+
+#ifdef HAVE_MALLOC_SIZE
+#define PREFIX_SIZE (0)
+#else
+/* Use at least 8 bits alignment on all systems. */
+#if SIZE_MAX < 0xffffffffffffffffull
+#define PREFIX_SIZE 8
+#else
+#define PREFIX_SIZE (sizeof(size_t))
+#endif
+#endif
+
+/* When using the libc allocator, use a minimum allocation size to match the
+ * jemalloc behavior that doesn't return NULL in this case.
+ */
+#define MALLOC_MIN_SIZE(x) ((x) > 0 ? (x) : sizeof(long))
+
+/* 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) atomicIncr(used_memory,(__n))
+#define update_zmalloc_stat_free(__n) atomicDecr(used_memory,(__n))
+
+static redisAtomic size_t used_memory = 0;
+
+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;
+
+#ifdef HAVE_MALLOC_SIZE
+void *extend_to_usable(void *ptr, size_t size) {
+ UNUSED(size);
+ return ptr;
+}
+#endif
+
+/* Try allocating memory, and return NULL if failed.
+ * '*usable' is set to the usable size if non NULL. */
+static inline void *ztrymalloc_usable_internal(size_t size, size_t *usable) {
+ /* Possible overflow, return NULL, so that the caller can panic or handle a failed allocation. */
+ if (size >= SIZE_MAX/2) return NULL;
+ void *ptr = malloc(MALLOC_MIN_SIZE(size)+PREFIX_SIZE);
+
+ if (!ptr) return NULL;
+#ifdef HAVE_MALLOC_SIZE
+ size = zmalloc_size(ptr);
+ update_zmalloc_stat_alloc(size);
+ if (usable) *usable = size;
+ return ptr;
+#else
+ *((size_t*)ptr) = size;
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE);
+ if (usable) *usable = size;
+ return (char*)ptr+PREFIX_SIZE;
+#endif
+}
+
+void *ztrymalloc_usable(size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ void *ptr = ztrymalloc_usable_internal(size, &usable_size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* Allocate memory or panic */
+void *zmalloc(size_t size) {
+ void *ptr = ztrymalloc_usable_internal(size, NULL);
+ if (!ptr) zmalloc_oom_handler(size);
+ return ptr;
+}
+
+/* Try allocating memory, and return NULL if failed. */
+void *ztrymalloc(size_t size) {
+ void *ptr = ztrymalloc_usable_internal(size, NULL);
+ return ptr;
+}
+
+/* Allocate memory or panic.
+ * '*usable' is set to the usable size if non NULL. */
+void *zmalloc_usable(size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ void *ptr = ztrymalloc_usable_internal(size, &usable_size);
+ if (!ptr) zmalloc_oom_handler(size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* 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) {
+ if (size >= SIZE_MAX/2) zmalloc_oom_handler(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
+
+/* Try allocating memory and zero it, and return NULL if failed.
+ * '*usable' is set to the usable size if non NULL. */
+static inline void *ztrycalloc_usable_internal(size_t size, size_t *usable) {
+ /* Possible overflow, return NULL, so that the caller can panic or handle a failed allocation. */
+ if (size >= SIZE_MAX/2) return NULL;
+ void *ptr = calloc(1, MALLOC_MIN_SIZE(size)+PREFIX_SIZE);
+ if (ptr == NULL) return NULL;
+
+#ifdef HAVE_MALLOC_SIZE
+ size = zmalloc_size(ptr);
+ update_zmalloc_stat_alloc(size);
+ if (usable) *usable = size;
+ return ptr;
+#else
+ *((size_t*)ptr) = size;
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE);
+ if (usable) *usable = size;
+ return (char*)ptr+PREFIX_SIZE;
+#endif
+}
+
+void *ztrycalloc_usable(size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ void *ptr = ztrycalloc_usable_internal(size, &usable_size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* Allocate memory and zero it or panic.
+ * We need this wrapper to have a calloc compatible signature */
+void *zcalloc_num(size_t num, size_t size) {
+ /* Ensure that the arguments to calloc(), when multiplied, do not wrap.
+ * Division operations are susceptible to divide-by-zero errors so we also check it. */
+ if ((size == 0) || (num > SIZE_MAX/size)) {
+ zmalloc_oom_handler(SIZE_MAX);
+ return NULL;
+ }
+ void *ptr = ztrycalloc_usable_internal(num*size, NULL);
+ if (!ptr) zmalloc_oom_handler(num*size);
+ return ptr;
+}
+
+/* Allocate memory and zero it or panic */
+void *zcalloc(size_t size) {
+ void *ptr = ztrycalloc_usable_internal(size, NULL);
+ if (!ptr) zmalloc_oom_handler(size);
+ return ptr;
+}
+
+/* Try allocating memory, and return NULL if failed. */
+void *ztrycalloc(size_t size) {
+ void *ptr = ztrycalloc_usable_internal(size, NULL);
+ return ptr;
+}
+
+/* Allocate memory or panic.
+ * '*usable' is set to the usable size if non NULL. */
+void *zcalloc_usable(size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ void *ptr = ztrycalloc_usable_internal(size, &usable_size);
+ if (!ptr) zmalloc_oom_handler(size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* Try reallocating memory, and return NULL if failed.
+ * '*usable' is set to the usable size if non NULL. */
+static inline void *ztryrealloc_usable_internal(void *ptr, size_t size, size_t *usable) {
+#ifndef HAVE_MALLOC_SIZE
+ void *realptr;
+#endif
+ size_t oldsize;
+ void *newptr;
+
+ /* not allocating anything, just redirect to free. */
+ if (size == 0 && ptr != NULL) {
+ zfree(ptr);
+ if (usable) *usable = 0;
+ return NULL;
+ }
+ /* Not freeing anything, just redirect to malloc. */
+ if (ptr == NULL)
+ return ztrymalloc_usable(size, usable);
+
+ /* Possible overflow, return NULL, so that the caller can panic or handle a failed allocation. */
+ if (size >= SIZE_MAX/2) {
+ zfree(ptr);
+ if (usable) *usable = 0;
+ return NULL;
+ }
+
+#ifdef HAVE_MALLOC_SIZE
+ oldsize = zmalloc_size(ptr);
+ newptr = realloc(ptr,size);
+ if (newptr == NULL) {
+ if (usable) *usable = 0;
+ return NULL;
+ }
+
+ update_zmalloc_stat_free(oldsize);
+ size = zmalloc_size(newptr);
+ update_zmalloc_stat_alloc(size);
+ if (usable) *usable = size;
+ return newptr;
+#else
+ realptr = (char*)ptr-PREFIX_SIZE;
+ oldsize = *((size_t*)realptr);
+ newptr = realloc(realptr,size+PREFIX_SIZE);
+ if (newptr == NULL) {
+ if (usable) *usable = 0;
+ return NULL;
+ }
+
+ *((size_t*)newptr) = size;
+ update_zmalloc_stat_free(oldsize);
+ update_zmalloc_stat_alloc(size);
+ if (usable) *usable = size;
+ return (char*)newptr+PREFIX_SIZE;
+#endif
+}
+
+void *ztryrealloc_usable(void *ptr, size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ ptr = ztryrealloc_usable_internal(ptr, size, &usable_size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* Reallocate memory and zero it or panic */
+void *zrealloc(void *ptr, size_t size) {
+ ptr = ztryrealloc_usable_internal(ptr, size, NULL);
+ if (!ptr && size != 0) zmalloc_oom_handler(size);
+ return ptr;
+}
+
+/* Try Reallocating memory, and return NULL if failed. */
+void *ztryrealloc(void *ptr, size_t size) {
+ ptr = ztryrealloc_usable_internal(ptr, size, NULL);
+ return ptr;
+}
+
+/* Reallocate memory or panic.
+ * '*usable' is set to the usable size if non NULL. */
+void *zrealloc_usable(void *ptr, size_t size, size_t *usable) {
+ size_t usable_size = 0;
+ ptr = ztryrealloc_usable(ptr, size, &usable_size);
+ if (!ptr && size != 0) zmalloc_oom_handler(size);
+#ifdef HAVE_MALLOC_SIZE
+ ptr = extend_to_usable(ptr, usable_size);
+#endif
+ if (usable) *usable = usable_size;
+ return ptr;
+}
+
+/* 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);
+ return size+PREFIX_SIZE;
+}
+size_t zmalloc_usable_size(void *ptr) {
+ return zmalloc_size(ptr)-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
+}
+
+/* Similar to zfree, '*usable' is set to the usable size being freed. */
+void zfree_usable(void *ptr, size_t *usable) {
+#ifndef HAVE_MALLOC_SIZE
+ void *realptr;
+ size_t oldsize;
+#endif
+
+ if (ptr == NULL) return;
+#ifdef HAVE_MALLOC_SIZE
+ update_zmalloc_stat_free(*usable = zmalloc_size(ptr));
+ free(ptr);
+#else
+ realptr = (char*)ptr-PREFIX_SIZE;
+ *usable = 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;
+}
+
+/* Use 'MADV_DONTNEED' to release memory to operating system quickly.
+ * We do that in a fork child process to avoid CoW when the parent modifies
+ * these shared pages. */
+void zmadvise_dontneed(void *ptr) {
+#if defined(USE_JEMALLOC) && defined(__linux__)
+ static size_t page_size = 0;
+ if (page_size == 0) page_size = sysconf(_SC_PAGESIZE);
+ size_t page_size_mask = page_size - 1;
+
+ size_t real_size = zmalloc_size(ptr);
+ if (real_size < page_size) return;
+
+ /* We need to align the pointer upwards according to page size, because
+ * the memory address is increased upwards and we only can free memory
+ * based on page. */
+ char *aligned_ptr = (char *)(((size_t)ptr+page_size_mask) & ~page_size_mask);
+ real_size -= (aligned_ptr-(char*)ptr);
+ if (real_size >= page_size) {
+ madvise((void *)aligned_ptr, real_size&~page_size_mask, MADV_DONTNEED);
+ }
+#else
+ (void)(ptr);
+#endif
+}
+
+/* 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+/* Get the i'th field from "/proc/self/stats" note i is 1 based as appears in the 'proc' man page */
+int get_proc_stat_ll(int i, long long *res) {
+#if defined(HAVE_PROC_STAT)
+ char buf[4096];
+ int fd, l;
+ char *p, *x;
+
+ if ((fd = open("/proc/self/stat",O_RDONLY)) == -1) return 0;
+ if ((l = read(fd,buf,sizeof(buf)-1)) <= 0) {
+ close(fd);
+ return 0;
+ }
+ close(fd);
+ buf[l] = '\0';
+ if (buf[l-1] == '\n') buf[l-1] = '\0';
+
+ /* Skip pid and process name (surrounded with parentheses) */
+ p = strrchr(buf, ')');
+ if (!p) return 0;
+ p++;
+ while (*p == ' ') p++;
+ if (*p == '\0') return 0;
+ i -= 3;
+ if (i < 0) return 0;
+
+ while (p && i--) {
+ p = strchr(p, ' ');
+ if (p) p++;
+ else return 0;
+ }
+ x = strchr(p,' ');
+ if (x) *x = '\0';
+
+ *res = strtoll(p,&x,10);
+ if (*x != '\0') return 0;
+ return 1;
+#else
+ UNUSED(i);
+ UNUSED(res);
+ return 0;
+#endif
+}
+
+#if defined(HAVE_PROC_STAT)
+size_t zmalloc_get_rss(void) {
+ int page = sysconf(_SC_PAGESIZE);
+ long long rss;
+
+ /* RSS is the 24th field in /proc/<pid>/stat */
+ if (!get_proc_stat_ll(24, &rss)) return 0;
+ rss *= page;
+ return rss;
+}
+#elif defined(HAVE_TASKINFO)
+#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;
+}
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+
+size_t zmalloc_get_rss(void) {
+ struct kinfo_proc info;
+ size_t infolen = sizeof(info);
+ int mib[4];
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_PID;
+ mib[3] = getpid();
+
+ if (sysctl(mib, 4, &info, &infolen, NULL, 0) == 0)
+#if defined(__FreeBSD__)
+ return (size_t)info.ki_rssize * getpagesize();
+#else
+ return (size_t)info.kp_vm_rssize * getpagesize();
+#endif
+
+ return 0L;
+}
+#elif defined(__NetBSD__) || defined(__OpenBSD__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#if defined(__OpenBSD__)
+#define kinfo_proc2 kinfo_proc
+#define KERN_PROC2 KERN_PROC
+#define __arraycount(a) (sizeof(a) / sizeof(a[0]))
+#endif
+
+size_t zmalloc_get_rss(void) {
+ struct kinfo_proc2 info;
+ size_t infolen = sizeof(info);
+ int mib[6];
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC2;
+ mib[2] = KERN_PROC_PID;
+ mib[3] = getpid();
+ mib[4] = sizeof(info);
+ mib[5] = 1;
+ if (sysctl(mib, __arraycount(mib), &info, &infolen, NULL, 0) == 0)
+ return (size_t)info.p_vm_rssize * getpagesize();
+
+ return 0L;
+}
+#elif defined(__HAIKU__)
+#include <OS.h>
+
+size_t zmalloc_get_rss(void) {
+ area_info info;
+ thread_info th;
+ size_t rss = 0;
+ ssize_t cookie = 0;
+
+ if (get_thread_info(find_thread(0), &th) != B_OK)
+ return 0;
+
+ while (get_next_area_info(th.team, &cookie, &info) == B_OK)
+ rss += info.ram_size;
+
+ return rss;
+}
+#elif defined(HAVE_PSINFO)
+#include <unistd.h>
+#include <sys/procfs.h>
+#include <fcntl.h>
+
+size_t zmalloc_get_rss(void) {
+ struct prpsinfo info;
+ char filename[256];
+ int fd;
+
+ snprintf(filename,256,"/proc/%ld/psinfo",(long) getpid());
+
+ if ((fd = open(filename,O_RDONLY)) == -1) return 0;
+ if (ioctl(fd, PIOCPSINFO, &info) == -1) {
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+ return info.pr_rssize;
+}
+#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
+
+#if defined(USE_JEMALLOC)
+
+int zmalloc_get_allocator_info(size_t *allocated,
+ size_t *active,
+ size_t *resident) {
+ uint64_t epoch = 1;
+ size_t sz;
+ *allocated = *resident = *active = 0;
+ /* Update the statistics cached by mallctl. */
+ sz = sizeof(epoch);
+ je_mallctl("epoch", &epoch, &sz, &epoch, sz);
+ sz = sizeof(size_t);
+ /* Unlike RSS, this does not include RSS from shared libraries and other non
+ * heap mappings. */
+ je_mallctl("stats.resident", resident, &sz, NULL, 0);
+ /* Unlike resident, this doesn't not include the pages jemalloc reserves
+ * for re-use (purge will clean that). */
+ je_mallctl("stats.active", active, &sz, NULL, 0);
+ /* Unlike zmalloc_used_memory, this matches the stats.resident by taking
+ * into account all allocations done by this process (not only zmalloc). */
+ je_mallctl("stats.allocated", allocated, &sz, NULL, 0);
+ return 1;
+}
+
+void set_jemalloc_bg_thread(int enable) {
+ /* let jemalloc do purging asynchronously, required when there's no traffic
+ * after flushdb */
+ char val = !!enable;
+ je_mallctl("background_thread", NULL, 0, &val, 1);
+}
+
+int jemalloc_purge(void) {
+ /* return all unused (reserved) pages to the OS */
+ char tmp[32];
+ unsigned narenas = 0;
+ size_t sz = sizeof(unsigned);
+ if (!je_mallctl("arenas.narenas", &narenas, &sz, NULL, 0)) {
+ snprintf(tmp, sizeof(tmp), "arena.%d.purge", narenas);
+ if (!je_mallctl(tmp, NULL, 0, NULL, 0))
+ return 0;
+ }
+ return -1;
+}
+
+#else
+
+int zmalloc_get_allocator_info(size_t *allocated,
+ size_t *active,
+ size_t *resident) {
+ *allocated = *resident = *active = 0;
+ return 1;
+}
+
+void set_jemalloc_bg_thread(int enable) {
+ ((void)(enable));
+}
+
+int jemalloc_purge(void) {
+ return 0;
+}
+
+#endif
+
+#if defined(__APPLE__)
+/* For proc_pidinfo() used later in zmalloc_get_smap_bytes_by_field().
+ * Note that this file cannot be included in zmalloc.h because it includes
+ * a Darwin queue.h file where there is a "LIST_HEAD" macro (!) defined
+ * conficting with Redis user code. */
+#include <libproc.h>
+#endif
+
+/* 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
+/* Get sum of the specified field from libproc api call.
+ * As there are per page value basis we need to convert
+ * them accordingly.
+ *
+ * Note that AnonHugePages is a no-op as THP feature
+ * is not supported in this platform
+ */
+size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
+#if defined(__APPLE__)
+ struct proc_regioninfo pri;
+ if (pid == -1) pid = getpid();
+ if (proc_pidinfo(pid, PROC_PIDREGIONINFO, 0, &pri,
+ PROC_PIDREGIONINFO_SIZE) == PROC_PIDREGIONINFO_SIZE)
+ {
+ int pagesize = getpagesize();
+ if (!strcmp(field, "Private_Dirty:")) {
+ return (size_t)pri.pri_pages_dirtied * pagesize;
+ } else if (!strcmp(field, "Rss:")) {
+ return (size_t)pri.pri_pages_resident * pagesize;
+ } else if (!strcmp(field, "AnonHugePages:")) {
+ return 0;
+ }
+ }
+ return 0;
+#endif
+ ((void) field);
+ ((void) pid);
+ return 0;
+}
+#endif
+
+/* Return the total number bytes in pages marked as Private Dirty.
+ *
+ * Note: depending on the platform and memory footprint of the process, this
+ * call can be slow, exceeding 1000ms!
+ */
+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 achieve 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_PHYSMEM)
+ 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
+}
+
+#ifdef REDIS_TEST
+int zmalloc_test(int argc, char **argv, int flags) {
+ void *ptr;
+
+ UNUSED(argc);
+ UNUSED(argv);
+ UNUSED(flags);
+ printf("Malloc prefix size: %d\n", (int) PREFIX_SIZE);
+ printf("Initial used memory: %zu\n", zmalloc_used_memory());
+ ptr = zmalloc(123);
+ printf("Allocated 123 bytes; used: %zu\n", zmalloc_used_memory());
+ ptr = zrealloc(ptr, 456);
+ printf("Reallocated to 456 bytes; used: %zu\n", zmalloc_used_memory());
+ zfree(ptr);
+ printf("Freed pointer; used: %zu\n", zmalloc_used_memory());
+ return 0;
+}
+#endif
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