Issue 804 Add Default-Start and Default-Stop LSB tags for RedHat startup and update...

[redis.git] / src / zmalloc.c

diff --git a/src/zmalloc.c b/src/zmalloc.c
index 970677355f26656742b8ffc1c3071ec6a5c3e264..1f8c7f08e145b7b2f5de0ad74b2a5e6974e9c1c0 100644 (file)
--- 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"
@@ -76,7 +85,7 @@
 
 #endif
 
-#define update_zmalloc_stat_alloc(__n,__size) do { \
+#define update_zmalloc_stat_alloc(__n) do { \
     size_t _n = (__n); \
     if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
     if (zmalloc_thread_safe) { \
@@ -100,23 +109,25 @@ static size_t used_memory = 0;
 static int zmalloc_thread_safe = 0;
 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
 
-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
 }
@@ -124,13 +135,13 @@ 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(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
 }
@@ -146,20 +157,20 @@ void *zrealloc(void *ptr, size_t size) {
 #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
 }
@@ -227,6 +238,10 @@ 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
@@ -309,3 +324,28 @@ size_t zmalloc_get_rss(void) {
 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