src/zmalloc.c

/* zmalloc - total amount of allocated memory aware version of malloc()
 *
 * Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include "config.h"
#include "zmalloc.h"

#ifdef HAVE_MALLOC_SIZE
#define PREFIX_SIZE (0)
#else
#if defined(__sun) || defined(__sparc) || defined(__sparc__)
#define PREFIX_SIZE (sizeof(long long))
#else
#define PREFIX_SIZE (sizeof(size_t))
#endif
#endif

/* 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)
#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); \
    if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
    if (zmalloc_thread_safe) { \
        update_zmalloc_stat_add(_n); \
    } else { \
        used_memory += _n; \
    } \
} while(0)

#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) { \
        update_zmalloc_stat_sub(_n); \
    } else { \
        used_memory -= _n; \
    } \
} while(0)

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) {
    fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
        size);
    fflush(stderr);
    abort();
}

void *zmalloc(size_t size) {
    void *ptr = malloc(size+PREFIX_SIZE);

    if (!ptr) zmalloc_oom(size);
#ifdef HAVE_MALLOC_SIZE
    update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
    return ptr;
#else
    *((size_t*)ptr) = size;
    update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
    return (char*)ptr+PREFIX_SIZE;
#endif
}

void *zcalloc(size_t size) {
    void *ptr = calloc(1, size+PREFIX_SIZE);

    if (!ptr) zmalloc_oom(size);
#ifdef HAVE_MALLOC_SIZE
    update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
    return ptr;
#else
    *((size_t*)ptr) = size;
    update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
    return (char*)ptr+PREFIX_SIZE;
#endif
}

void *zrealloc(void *ptr, size_t size) {
#ifndef HAVE_MALLOC_SIZE
    void *realptr;
#endif
    size_t oldsize;
    void *newptr;

    if (ptr == NULL) return zmalloc(size);
#ifdef HAVE_MALLOC_SIZE
    oldsize = zmalloc_size(ptr);
    newptr = realloc(ptr,size);
    if (!newptr) zmalloc_oom(size);

    update_zmalloc_stat_free(oldsize);
    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);

    *((size_t*)newptr) = size;
    update_zmalloc_stat_free(oldsize);
    update_zmalloc_stat_alloc(size,size);
    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;
    size_t oldsize;
#endif

    if (ptr == NULL) return;
#ifdef HAVE_MALLOC_SIZE
    update_zmalloc_stat_free(zmalloc_size(ptr));
    free(ptr);
#else
    realptr = (char*)ptr-PREFIX_SIZE;
    oldsize = *((size_t*)realptr);
    update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
    free(realptr);
#endif
}

char *zstrdup(const char *s) {
    size_t l = strlen(s)+1;
    char *p = zmalloc(l);

    memcpy(p,s,l);
    return p;
}

size_t zmalloc_used_memory(void) {
    size_t 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;
    }

    return um;
}

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 <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

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/<pid>/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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <mach/task.h>
#include <mach/mach_init.h>

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();
}
Commit	Line	Data
	1	/* zmalloc - total amount of allocated memory aware version of malloc()
	2	*
	3	* Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions are met:
	8	*
	9	* * Redistributions of source code must retain the above copyright notice,
	10	* this list of conditions and the following disclaimer.
	11	* * Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* * Neither the name of Redis nor the names of its contributors may be used
	15	* to endorse or promote products derived from this software without
	16	* specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	19	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	22	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	23	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	24	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	25	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	26	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	27	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	28	* POSSIBILITY OF SUCH DAMAGE.
	29	*/
	30
	31	#include <stdio.h>
	32	#include <stdlib.h>
	33	#include <string.h>
	34	#include <pthread.h>
	35	#include "config.h"
	36	#include "zmalloc.h"
	37
	38	#ifdef HAVE_MALLOC_SIZE
	39	#define PREFIX_SIZE (0)
	40	#else
	41	#if defined(__sun) \|\| defined(__sparc) \|\| defined(__sparc__)
	42	#define PREFIX_SIZE (sizeof(long long))
	43	#else
	44	#define PREFIX_SIZE (sizeof(size_t))
	45	#endif
	46	#endif
	47
	48	/* Explicitly override malloc/free etc when using tcmalloc. */
	49	#if defined(USE_TCMALLOC)
	50	#define malloc(size) tc_malloc(size)
	51	#define calloc(count,size) tc_calloc(count,size)
	52	#define realloc(ptr,size) tc_realloc(ptr,size)
	53	#define free(ptr) tc_free(ptr)
	54	#elif defined(USE_JEMALLOC)
	55	#define malloc(size) je_malloc(size)
	56	#define calloc(count,size) je_calloc(count,size)
	57	#define realloc(ptr,size) je_realloc(ptr,size)
	58	#define free(ptr) je_free(ptr)
	59	#endif
	60
	61	#ifdef HAVE_ATOMIC
	62	#define update_zmalloc_stat_add(__n) __sync_add_and_fetch(&used_memory, (__n))
	63	#define update_zmalloc_stat_sub(__n) __sync_sub_and_fetch(&used_memory, (__n))
	64	#else
	65	#define update_zmalloc_stat_add(__n) do { \
	66	pthread_mutex_lock(&used_memory_mutex); \
	67	used_memory += (__n); \
	68	pthread_mutex_unlock(&used_memory_mutex); \
	69	} while(0)
	70
	71	#define update_zmalloc_stat_sub(__n) do { \
	72	pthread_mutex_lock(&used_memory_mutex); \
	73	used_memory -= (__n); \
	74	pthread_mutex_unlock(&used_memory_mutex); \
	75	} while(0)
	76
	77	#endif
	78
	79	#define update_zmalloc_stat_alloc(__n,__size) do { \
	80	size_t _n = (__n); \
	81	if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
	82	if (zmalloc_thread_safe) { \
	83	update_zmalloc_stat_add(_n); \
	84	} else { \
	85	used_memory += _n; \
	86	} \
	87	} while(0)
	88
	89	#define update_zmalloc_stat_free(__n) do { \
	90	size_t _n = (__n); \
	91	if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
	92	if (zmalloc_thread_safe) { \
	93	update_zmalloc_stat_sub(_n); \
	94	} else { \
	95	used_memory -= _n; \
	96	} \
	97	} while(0)
	98
	99	static size_t used_memory = 0;
	100	static int zmalloc_thread_safe = 0;
	101	pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
	102
	103	static void zmalloc_oom(size_t size) {
	104	fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
	105	size);
	106	fflush(stderr);
	107	abort();
	108	}
	109
	110	void *zmalloc(size_t size) {
	111	void *ptr = malloc(size+PREFIX_SIZE);
	112
	113	if (!ptr) zmalloc_oom(size);
	114	#ifdef HAVE_MALLOC_SIZE
	115	update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
	116	return ptr;
	117	#else
	118	((size_t)ptr) = size;
	119	update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
	120	return (char*)ptr+PREFIX_SIZE;
	121	#endif
	122	}
	123
	124	void *zcalloc(size_t size) {
	125	void *ptr = calloc(1, size+PREFIX_SIZE);
	126
	127	if (!ptr) zmalloc_oom(size);
	128	#ifdef HAVE_MALLOC_SIZE
	129	update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
	130	return ptr;
	131	#else
	132	((size_t)ptr) = size;
	133	update_zmalloc_stat_alloc(size+PREFIX_SIZE,size);
	134	return (char*)ptr+PREFIX_SIZE;
	135	#endif
	136	}
	137
	138	void zrealloc(void ptr, size_t size) {
	139	#ifndef HAVE_MALLOC_SIZE
	140	void *realptr;
	141	#endif
	142	size_t oldsize;
	143	void *newptr;
	144
	145	if (ptr == NULL) return zmalloc(size);
	146	#ifdef HAVE_MALLOC_SIZE
	147	oldsize = zmalloc_size(ptr);
	148	newptr = realloc(ptr,size);
	149	if (!newptr) zmalloc_oom(size);
	150
	151	update_zmalloc_stat_free(oldsize);
	152	update_zmalloc_stat_alloc(zmalloc_size(newptr),size);
	153	return newptr;
	154	#else
	155	realptr = (char*)ptr-PREFIX_SIZE;
	156	oldsize = ((size_t)realptr);
	157	newptr = realloc(realptr,size+PREFIX_SIZE);
	158	if (!newptr) zmalloc_oom(size);
	159
	160	((size_t)newptr) = size;
	161	update_zmalloc_stat_free(oldsize);
	162	update_zmalloc_stat_alloc(size,size);
	163	return (char*)newptr+PREFIX_SIZE;
	164	#endif
	165	}
	166
	167	/* Provide zmalloc_size() for systems where this function is not provided by
	168	* malloc itself, given that in that case we store an header with this
	169	* information as the first bytes of every allocation. */
	170	#ifndef HAVE_MALLOC_SIZE
	171	size_t zmalloc_size(void *ptr) {
	172	void realptr = (char)ptr-PREFIX_SIZE;
	173	size_t size = ((size_t)realptr);
	174	/* Assume at least that all the allocations are padded at sizeof(long) by
	175	* the underlying allocator. */
	176	if (size&(sizeof(long)-1)) size += sizeof(long)-(size&(sizeof(long)-1));
	177	return size+PREFIX_SIZE;
	178	}
	179	#endif
	180
	181	void zfree(void *ptr) {
	182	#ifndef HAVE_MALLOC_SIZE
	183	void *realptr;
	184	size_t oldsize;
	185	#endif
	186
	187	if (ptr == NULL) return;
	188	#ifdef HAVE_MALLOC_SIZE
	189	update_zmalloc_stat_free(zmalloc_size(ptr));
	190	free(ptr);
	191	#else
	192	realptr = (char*)ptr-PREFIX_SIZE;
	193	oldsize = ((size_t)realptr);
	194	update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
	195	free(realptr);
	196	#endif
	197	}
	198
	199	char zstrdup(const char s) {
	200	size_t l = strlen(s)+1;
	201	char *p = zmalloc(l);
	202
	203	memcpy(p,s,l);
	204	return p;
	205	}
	206
	207	size_t zmalloc_used_memory(void) {
	208	size_t um;
	209
	210	if (zmalloc_thread_safe) {
	211	#ifdef HAVE_ATOMIC
	212	um = __sync_add_and_fetch(&used_memory, 0);
	213	#else
	214	pthread_mutex_lock(&used_memory_mutex);
	215	um = used_memory;
	216	pthread_mutex_unlock(&used_memory_mutex);
	217	#endif
	218	}
	219	else {
	220	um = used_memory;
	221	}
	222
	223	return um;
	224	}
	225
	226	void zmalloc_enable_thread_safeness(void) {
	227	zmalloc_thread_safe = 1;
	228	}
	229
	230	/* Get the RSS information in an OS-specific way.
	231	*
	232	* WARNING: the function zmalloc_get_rss() is not designed to be fast
	233	* and may not be called in the busy loops where Redis tries to release
	234	* memory expiring or swapping out objects.
	235	*
	236	* For this kind of "fast RSS reporting" usages use instead the
	237	* function RedisEstimateRSS() that is a much faster (and less precise)
	238	* version of the funciton. */
	239
	240	#if defined(HAVE_PROCFS)
	241	#include <unistd.h>
	242	#include <sys/types.h>
	243	#include <sys/stat.h>
	244	#include <fcntl.h>
	245
	246	size_t zmalloc_get_rss(void) {
	247	int page = sysconf(_SC_PAGESIZE);
	248	size_t rss;
	249	char buf[4096];
	250	char filename[256];
	251	int fd, count;
	252	char p, x;
	253
	254	snprintf(filename,256,"/proc/%d/stat",getpid());
	255	if ((fd = open(filename,O_RDONLY)) == -1) return 0;
	256	if (read(fd,buf,4096) <= 0) {
	257	close(fd);
	258	return 0;
	259	}
	260	close(fd);
	261
	262	p = buf;
	263	count = 23; /* RSS is the 24th field in /proc/<pid>/stat */
	264	while(p && count--) {
	265	p = strchr(p,' ');
	266	if (p) p++;
	267	}
	268	if (!p) return 0;
	269	x = strchr(p,' ');
	270	if (!x) return 0;
	271	*x = '\0';
	272
	273	rss = strtoll(p,NULL,10);
	274	rss *= page;
	275	return rss;
	276	}
	277	#elif defined(HAVE_TASKINFO)
	278	#include <unistd.h>
	279	#include <stdio.h>
	280	#include <stdlib.h>
	281	#include <sys/types.h>
	282	#include <sys/sysctl.h>
	283	#include <mach/task.h>
	284	#include <mach/mach_init.h>
	285
	286	size_t zmalloc_get_rss(void) {
	287	task_t task = MACH_PORT_NULL;
	288	struct task_basic_info t_info;
	289	mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
	290
	291	if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS)
	292	return 0;
	293	task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
	294
	295	return t_info.resident_size;
	296	}
	297	#else
	298	size_t zmalloc_get_rss(void) {
	299	/* If we can't get the RSS in an OS-specific way for this system just
	300	* return the memory usage we estimated in zmalloc()..
	301	*
	302	* Fragmentation will appear to be always 1 (no fragmentation)
	303	* of course... */
	304	return zmalloc_used_memory();
	305	}
	306	#endif
	307
	308	/* Fragmentation = RSS / allocated-bytes */
	309	float zmalloc_get_fragmentation_ratio(void) {
	310	return (float)zmalloc_get_rss()/zmalloc_used_memory();
	311	}