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 428951a46e3f1c0c082a947818acc48da048666f..1f8c7f08e145b7b2f5de0ad74b2a5e6974e9c1c0 100644 (file)
--- a/src/zmalloc.c
+++ b/src/zmalloc.c
@@ -30,6 +30,15 @@
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #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 <string.h>
 #include <pthread.h>
 #include "config.h"


@@ -38,7 +47,7 @@
 #ifdef HAVE_MALLOC_SIZE
 #define PREFIX_SIZE (0)
 #else
 #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 PREFIX_SIZE (sizeof(long long))
 #else
 #define PREFIX_SIZE (sizeof(size_t))


@@ -58,18 +67,31 @@
 #define free(ptr) je_free(ptr)
 #endif
 
 #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 _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) { \
     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; \
     } else { \
         used_memory += _n; \

-        zmalloc_allocations[_stat_slot]++; \

     } \
 } while(0)
 
     } \
 } while(0)
 


@@ -77,9 +99,7 @@
     size_t _n = (__n); \
     if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
     if (zmalloc_thread_safe) { \
     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; \
     } \
     } else { \
         used_memory -= _n; \
     } \


@@ -88,26 +108,26 @@
 static size_t used_memory = 0;
 static int zmalloc_thread_safe = 0;
 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
 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();
 }
 
     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);
 
 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
 #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;
     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
 }
     return (char*)ptr+PREFIX_SIZE;
 #endif
 }


@@ -115,13 +135,13 @@ void *zmalloc(size_t size) {
 void *zcalloc(size_t size) {
     void *ptr = calloc(1, size+PREFIX_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
 #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;
     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
 }
     return (char*)ptr+PREFIX_SIZE;
 #endif
 }


@@ -137,24 +157,38 @@ void *zrealloc(void *ptr, size_t size) {
 #ifdef HAVE_MALLOC_SIZE
     oldsize = zmalloc_size(ptr);
     newptr = realloc(ptr,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_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);
     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);
 
     *((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
 }
 
     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;
 void zfree(void *ptr) {
 #ifndef HAVE_MALLOC_SIZE
     void *realptr;


@@ -184,21 +218,30 @@ char *zstrdup(const char *s) {
 size_t zmalloc_used_memory(void) {
     size_t um;
 
 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_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
 /* Get the RSS information in an OS-specific way.
  *
  * WARNING: the function zmalloc_get_rss() is not designed to be fast


@@ -281,3 +324,28 @@ size_t zmalloc_get_rss(void) {
 float zmalloc_get_fragmentation_ratio(void) {
     return (float)zmalloc_get_rss()/zmalloc_used_memory();
 }
 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