X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/c4df22afb6756446d35bb7ed3fc4a0bc42086056..a779b7e901e9f863dc195d3590b554a917a0b3e2:/src/zmalloc.c

diff --git a/src/zmalloc.c b/src/zmalloc.c
index aa3ccfe9..43d60a9c 100644
--- a/src/zmalloc.c
+++ b/src/zmalloc.c
@@ -30,6 +30,15 @@
 
 #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"
@@ -38,7 +47,7 @@
 #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))
@@ -51,20 +60,38 @@
 #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 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,__size) 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)
 
@@ -72,9 +99,7 @@
     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; \
     } \
@@ -83,22 +108,22 @@
 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(redis_malloc_size(ptr),size);
+    update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
     return ptr;
 #else
     *((size_t*)ptr) = size;
@@ -110,9 +135,9 @@ void *zmalloc(size_t size) {
 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(redis_malloc_size(ptr),size);
+    update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
     return ptr;
 #else
     *((size_t*)ptr) = size;
@@ -130,18 +155,18 @@ void *zrealloc(void *ptr, size_t size) {
 
     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);
+    if (!newptr) zmalloc_oom_handler(size);
 
     update_zmalloc_stat_free(oldsize);
-    update_zmalloc_stat_alloc(redis_malloc_size(newptr),size);
+    update_zmalloc_stat_alloc(zmalloc_size(newptr),size);
     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);
@@ -150,6 +175,20 @@ void *zrealloc(void *ptr, size_t 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;
@@ -158,7 +197,7 @@ void zfree(void *ptr) {
 
     if (ptr == NULL) return;
 #ifdef HAVE_MALLOC_SIZE
-    update_zmalloc_stat_free(redis_malloc_size(ptr));
+    update_zmalloc_stat_free(zmalloc_size(ptr));
     free(ptr);
 #else
     realptr = (char*)ptr-PREFIX_SIZE;
@@ -179,21 +218,30 @@ char *zstrdup(const char *s) {
 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