#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"
#ifdef HAVE_MALLOC_SIZE
#define PREFIX_SIZE (0)
#else
-#if defined(__sun)
+#if defined(__sun) || defined(__sparc) || defined(__sparc__)
#define PREFIX_SIZE (sizeof(long long))
#else
#define PREFIX_SIZE (sizeof(size_t))
#define free(ptr) je_free(ptr)
#endif
-#define update_zmalloc_stat_alloc(__n,__size) do { \
+#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 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 update_zmalloc_stat_alloc(__n) do { \
size_t _n = (__n); \
- size_t _stat_slot = (__size < ZMALLOC_MAX_ALLOC_STAT) ? __size : ZMALLOC_MAX_ALLOC_STAT; \
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; \
- zmalloc_allocations[_stat_slot]++; \
- pthread_mutex_unlock(&used_memory_mutex); \
+ update_zmalloc_stat_add(_n); \
} else { \
used_memory += _n; \
- zmalloc_allocations[_stat_slot]++; \
} \
} while(0)
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; \
} \
static size_t used_memory = 0;
static int zmalloc_thread_safe = 0;
pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
-/* Note that malloc_allocations elements are initialized to zero by C */
-size_t zmalloc_allocations[ZMALLOC_MAX_ALLOC_STAT+1];
-static void zmalloc_oom(size_t size) {
+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(size);
+ if (!ptr) zmalloc_oom_handler(size);
#ifdef HAVE_MALLOC_SIZE
- update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
+ update_zmalloc_stat_alloc(zmalloc_size(ptr));
return ptr;
#else
*((size_t*)ptr) = size;
- update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE);
return (char*)ptr+PREFIX_SIZE;
#endif
}
void *zcalloc(size_t size) {
void *ptr = calloc(1, size+PREFIX_SIZE);
- if (!ptr) zmalloc_oom(size);
+ if (!ptr) zmalloc_oom_handler(size);
#ifdef HAVE_MALLOC_SIZE
- update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
+ update_zmalloc_stat_alloc(zmalloc_size(ptr));
return ptr;
#else
*((size_t*)ptr) = size;
- update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
+ update_zmalloc_stat_alloc(size+PREFIX_SIZE);
return (char*)ptr+PREFIX_SIZE;
#endif
}
#ifdef HAVE_MALLOC_SIZE
oldsize = zmalloc_size(ptr);
newptr = realloc(ptr,size);
- if (!newptr) zmalloc_oom(size);
+ if (!newptr) zmalloc_oom_handler(size);
update_zmalloc_stat_free(oldsize);
- update_zmalloc_stat_alloc(zmalloc_size(newptr),size);
+ 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(size);
+ if (!newptr) zmalloc_oom_handler(size);
*((size_t*)newptr) = size;
update_zmalloc_stat_free(oldsize);
- update_zmalloc_stat_alloc(size,size);
+ 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 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;
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);
- return um;
-}
+ 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;
+ }
-size_t zmalloc_allocations_for_size(size_t size) {
- if (size > ZMALLOC_MAX_ALLOC_STAT) return 0;
- return zmalloc_allocations[size];
+ return um;
}
void zmalloc_enable_thread_safeness(void) {
zmalloc_thread_safe = 1;
}
+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
float zmalloc_get_fragmentation_ratio(void) {
return (float)zmalloc_get_rss()/zmalloc_used_memory();
}
+
+#if defined(HAVE_PROCFS)
+size_t zmalloc_get_private_dirty(void) {
+ char line[1024];
+ size_t pd = 0;
+ FILE *fp = fopen("/proc/self/smaps","r");
+
+ if (!fp) return 0;
+ while(fgets(line,sizeof(line),fp) != NULL) {
+ if (strncmp(line,"Private_Dirty:",14) == 0) {
+ char *p = strchr(line,'k');
+ if (p) {
+ *p = '\0';
+ pd += strtol(line+14,NULL,10) * 1024;
+ }
+ }
+ }
+ fclose(fp);
+ return pd;
+}
+#else
+size_t zmalloc_get_private_dirty(void) {
+ return 0;
+}
+#endif
projects / redis.git / blobdiff