X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/29d04257b0cb09028978f02c6404a0c002f0314c..d310fbedabd3101505b694f5c25a2e48480a3c2b:/src/zmalloc.c?ds=sidebyside diff --git a/src/zmalloc.c b/src/zmalloc.c index 428951a4..43d60a9c 100644 --- a/src/zmalloc.c +++ b/src/zmalloc.c @@ -30,6 +30,15 @@ #include #include + +/* 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 #include #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)) @@ -58,18 +67,31 @@ #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) @@ -77,9 +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; \ } \ @@ -88,20 +108,20 @@ 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); return ptr; @@ -115,7 +135,7 @@ 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); return ptr; @@ -137,7 +157,7 @@ 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); @@ -146,7 +166,7 @@ void *zrealloc(void *ptr, size_t size) { 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); @@ -155,6 +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; @@ -184,21 +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