X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/399f2f401c6fc3d489e2e40ffc78638425e3a09e..c66bf1fa32655ccf3f39b4cd72953459576463f5:/src/zmalloc.c diff --git a/src/zmalloc.c b/src/zmalloc.c index 5c1b5e9a..aa3ccfe9 100644 --- a/src/zmalloc.c +++ b/src/zmalloc.c @@ -33,26 +33,42 @@ #include #include #include "config.h" +#include "zmalloc.h" +#ifdef HAVE_MALLOC_SIZE +#define PREFIX_SIZE (0) +#else #if defined(__sun) -#define PREFIX_SIZE sizeof(long long) +#define PREFIX_SIZE (sizeof(long long)) #else -#define PREFIX_SIZE sizeof(size_t) +#define PREFIX_SIZE (sizeof(size_t)) +#endif #endif -#define increment_used_memory(__n) do { \ +/* Explicitly override malloc/free etc when using tcmalloc. */ +#if defined(USE_TCMALLOC) +#define malloc(size) tc_malloc(size) +#define calloc(count,size) tc_calloc(count,size) +#define realloc(ptr,size) tc_realloc(ptr,size) +#define free(ptr) tc_free(ptr) +#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); \ } else { \ used_memory += _n; \ + zmalloc_allocations[_stat_slot]++; \ } \ } while(0) -#define decrement_used_memory(__n) do { \ +#define update_zmalloc_stat_free(__n) do { \ size_t _n = (__n); \ if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \ if (zmalloc_thread_safe) { \ @@ -67,6 +83,8 @@ 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) { fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n", @@ -80,11 +98,11 @@ void *zmalloc(size_t size) { if (!ptr) zmalloc_oom(size); #ifdef HAVE_MALLOC_SIZE - increment_used_memory(redis_malloc_size(ptr)); + update_zmalloc_stat_alloc(redis_malloc_size(ptr),size); return ptr; #else *((size_t*)ptr) = size; - increment_used_memory(size+PREFIX_SIZE); + update_zmalloc_stat_alloc(size+PREFIX_SIZE,size); return (char*)ptr+PREFIX_SIZE; #endif } @@ -94,11 +112,11 @@ void *zcalloc(size_t size) { if (!ptr) zmalloc_oom(size); #ifdef HAVE_MALLOC_SIZE - increment_used_memory(redis_malloc_size(ptr)); + update_zmalloc_stat_alloc(redis_malloc_size(ptr),size); return ptr; #else *((size_t*)ptr) = size; - increment_used_memory(size+PREFIX_SIZE); + update_zmalloc_stat_alloc(size+PREFIX_SIZE,size); return (char*)ptr+PREFIX_SIZE; #endif } @@ -116,8 +134,8 @@ void *zrealloc(void *ptr, size_t size) { newptr = realloc(ptr,size); if (!newptr) zmalloc_oom(size); - decrement_used_memory(oldsize); - increment_used_memory(redis_malloc_size(newptr)); + update_zmalloc_stat_free(oldsize); + update_zmalloc_stat_alloc(redis_malloc_size(newptr),size); return newptr; #else realptr = (char*)ptr-PREFIX_SIZE; @@ -126,8 +144,8 @@ void *zrealloc(void *ptr, size_t size) { if (!newptr) zmalloc_oom(size); *((size_t*)newptr) = size; - decrement_used_memory(oldsize); - increment_used_memory(size); + update_zmalloc_stat_free(oldsize); + update_zmalloc_stat_alloc(size,size); return (char*)newptr+PREFIX_SIZE; #endif } @@ -140,12 +158,12 @@ void zfree(void *ptr) { if (ptr == NULL) return; #ifdef HAVE_MALLOC_SIZE - decrement_used_memory(redis_malloc_size(ptr)); + update_zmalloc_stat_free(redis_malloc_size(ptr)); free(ptr); #else realptr = (char*)ptr-PREFIX_SIZE; oldsize = *((size_t*)realptr); - decrement_used_memory(oldsize+PREFIX_SIZE); + update_zmalloc_stat_free(oldsize+PREFIX_SIZE); free(realptr); #endif } @@ -167,6 +185,94 @@ size_t zmalloc_used_memory(void) { return um; } +size_t zmalloc_allocations_for_size(size_t size) { + if (size > ZMALLOC_MAX_ALLOC_STAT) return 0; + return zmalloc_allocations[size]; +} + void zmalloc_enable_thread_safeness(void) { zmalloc_thread_safe = 1; } + +/* Get the RSS information in an OS-specific way. + * + * WARNING: the function zmalloc_get_rss() is not designed to be fast + * and may not be called in the busy loops where Redis tries to release + * memory expiring or swapping out objects. + * + * For this kind of "fast RSS reporting" usages use instead the + * function RedisEstimateRSS() that is a much faster (and less precise) + * version of the funciton. */ + +#if defined(HAVE_PROCFS) +#include +#include +#include +#include + +size_t zmalloc_get_rss(void) { + int page = sysconf(_SC_PAGESIZE); + size_t rss; + char buf[4096]; + char filename[256]; + int fd, count; + char *p, *x; + + snprintf(filename,256,"/proc/%d/stat",getpid()); + if ((fd = open(filename,O_RDONLY)) == -1) return 0; + if (read(fd,buf,4096) <= 0) { + close(fd); + return 0; + } + close(fd); + + p = buf; + count = 23; /* RSS is the 24th field in /proc//stat */ + while(p && count--) { + p = strchr(p,' '); + if (p) p++; + } + if (!p) return 0; + x = strchr(p,' '); + if (!x) return 0; + *x = '\0'; + + rss = strtoll(p,NULL,10); + rss *= page; + return rss; +} +#elif defined(HAVE_TASKINFO) +#include +#include +#include +#include +#include +#include +#include + +size_t zmalloc_get_rss(void) { + task_t task = MACH_PORT_NULL; + struct task_basic_info t_info; + mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT; + + if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS) + return 0; + task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count); + + return t_info.resident_size; +} +#else +size_t zmalloc_get_rss(void) { + /* If we can't get the RSS in an OS-specific way for this system just + * return the memory usage we estimated in zmalloc().. + * + * Fragmentation will appear to be always 1 (no fragmentation) + * of course... */ + return zmalloc_used_memory(); +} +#endif + +/* Fragmentation = RSS / allocated-bytes */ +float zmalloc_get_fragmentation_ratio(void) { + return (float)zmalloc_get_rss()/zmalloc_used_memory(); +}