#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"
+
+#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
-#if defined(__sun)
-#define PREFIX_SIZE sizeof(long 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)
+#endif
+
+#ifdef HAVE_ATOMIC
+#define update_zmalloc_stat_add(__n) __sync_add_and_fetch(&used_memory, (__n))
+#define update_zmalloc_stat_sub(__n) __sync_sub_and_fetch(&used_memory, (__n))
#else
-#define PREFIX_SIZE sizeof(size_t)
+#define update_zmalloc_stat_add(__n) do { \
+ pthread_mutex_lock(&used_memory_mutex); \
+ used_memory += (__n); \
+ pthread_mutex_unlock(&used_memory_mutex); \
+} while(0)
+
+#define update_zmalloc_stat_sub(__n) do { \
+ pthread_mutex_lock(&used_memory_mutex); \
+ used_memory -= (__n); \
+ pthread_mutex_unlock(&used_memory_mutex); \
+} while(0)
+
#endif
-#define increment_used_memory(__n) do { \
+#define update_zmalloc_stat_alloc(__n,__size) do { \
size_t _n = (__n); \
if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
if (zmalloc_thread_safe) { \
- pthread_mutex_lock(&used_memory_mutex); \
- used_memory += _n; \
- pthread_mutex_unlock(&used_memory_mutex); \
+ update_zmalloc_stat_add(_n); \
} else { \
used_memory += _n; \
} \
} while(0)
-#define decrement_used_memory(__n) do { \
+#define update_zmalloc_stat_free(__n) do { \
size_t _n = (__n); \
if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
if (zmalloc_thread_safe) { \
- pthread_mutex_lock(&used_memory_mutex); \
- used_memory -= _n; \
- pthread_mutex_unlock(&used_memory_mutex); \
+ update_zmalloc_stat_sub(_n); \
} else { \
used_memory -= _n; \
} \
if (!ptr) zmalloc_oom(size);
#ifdef HAVE_MALLOC_SIZE
- increment_used_memory(redis_malloc_size(ptr));
+ update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
+ return ptr;
+#else
+ *((size_t*)ptr) = size;
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
+ return (char*)ptr+PREFIX_SIZE;
+#endif
+}
+
+void *zcalloc(size_t size) {
+ void *ptr = calloc(1, size+PREFIX_SIZE);
+
+ if (!ptr) zmalloc_oom(size);
+#ifdef HAVE_MALLOC_SIZE
+ update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
return ptr;
#else
*((size_t*)ptr) = size;
- increment_used_memory(size+PREFIX_SIZE);
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
return (char*)ptr+PREFIX_SIZE;
#endif
}
if (ptr == NULL) return zmalloc(size);
#ifdef HAVE_MALLOC_SIZE
- oldsize = redis_malloc_size(ptr);
+ oldsize = zmalloc_size(ptr);
newptr = realloc(ptr,size);
if (!newptr) zmalloc_oom(size);
- decrement_used_memory(oldsize);
- increment_used_memory(redis_malloc_size(newptr));
+ update_zmalloc_stat_free(oldsize);
+ update_zmalloc_stat_alloc(zmalloc_size(newptr),size);
return newptr;
#else
realptr = (char*)ptr-PREFIX_SIZE;
if (!newptr) zmalloc_oom(size);
*((size_t*)newptr) = size;
- decrement_used_memory(oldsize);
- increment_used_memory(size);
+ update_zmalloc_stat_free(oldsize);
+ update_zmalloc_stat_alloc(size,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 an 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;
if (ptr == NULL) return;
#ifdef HAVE_MALLOC_SIZE
- decrement_used_memory(redis_malloc_size(ptr));
+ update_zmalloc_stat_free(zmalloc_size(ptr));
free(ptr);
#else
realptr = (char*)ptr-PREFIX_SIZE;
oldsize = *((size_t*)realptr);
- decrement_used_memory(oldsize+PREFIX_SIZE);
+ update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
free(realptr);
#endif
}
size_t zmalloc_used_memory(void) {
size_t um;
- if (zmalloc_thread_safe) pthread_mutex_lock(&used_memory_mutex);
- um = used_memory;
- if (zmalloc_thread_safe) pthread_mutex_unlock(&used_memory_mutex);
+ if (zmalloc_thread_safe) {
+#ifdef HAVE_ATOMIC
+ um = __sync_add_and_fetch(&used_memory, 0);
+#else
+ pthread_mutex_lock(&used_memory_mutex);
+ um = used_memory;
+ pthread_mutex_unlock(&used_memory_mutex);
+#endif
+ }
+ else {
+ um = used_memory;
+ }
+
return um;
}
void zmalloc_enable_thread_safeness(void) {
zmalloc_thread_safe = 1;
}
+
+/* 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 funciton. */
+
+#if defined(HAVE_PROCFS)
+#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(void) {
+ return (float)zmalloc_get_rss()/zmalloc_used_memory();
+}
projects / redis.git / blobdiff