Mercurial

comparison third_party/wrk/src/zmalloc.c @ 186:8cf4ec5e2191 hg-web

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fixed merge conflict.
author MrJuneJune <me@mrjunejune.com>
date Fri, 23 Jan 2026 22:38:59 -0800
parents 94705b5986b3
children
comparison
equal deleted inserted replaced
176:fed99fc04e12 186:8cf4ec5e2191
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
34 /* This function provide us access to the original libc free(). This is useful
35 * for instance to free results obtained by backtrace_symbols(). We need
36 * to define this function before including zmalloc.h that may shadow the
37 * free implementation if we use jemalloc or another non standard allocator. */
38 void zlibc_free(void *ptr) {
39 free(ptr);
40 }
41
42 #include <string.h>
43 #include <pthread.h>
44 #include "config.h"
45 #include "zmalloc.h"
46 #include "atomicvar.h"
47
48 #ifdef HAVE_MALLOC_SIZE
49 #define PREFIX_SIZE (0)
50 #else
51 #if defined(__sun) || defined(__sparc) || defined(__sparc__)
52 #define PREFIX_SIZE (sizeof(long long))
53 #else
54 #define PREFIX_SIZE (sizeof(size_t))
55 #endif
56 #endif
57
58 /* Explicitly override malloc/free etc when using tcmalloc. */
59 #if defined(USE_TCMALLOC)
60 #define malloc(size) tc_malloc(size)
61 #define calloc(count,size) tc_calloc(count,size)
62 #define realloc(ptr,size) tc_realloc(ptr,size)
63 #define free(ptr) tc_free(ptr)
64 #elif defined(USE_JEMALLOC)
65 #define malloc(size) je_malloc(size)
66 #define calloc(count,size) je_calloc(count,size)
67 #define realloc(ptr,size) je_realloc(ptr,size)
68 #define free(ptr) je_free(ptr)
69 #define mallocx(size,flags) je_mallocx(size,flags)
70 #define dallocx(ptr,flags) je_dallocx(ptr,flags)
71 #endif
72
73 #define update_zmalloc_stat_alloc(__n) do { \
74 size_t _n = (__n); \
75 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
76 atomicIncr(used_memory,__n); \
77 } while(0)
78
79 #define update_zmalloc_stat_free(__n) do { \
80 size_t _n = (__n); \
81 if (_n&(sizeof(long)-1)) _n += sizeof(long)-(_n&(sizeof(long)-1)); \
82 atomicDecr(used_memory,__n); \
83 } while(0)
84
85 static size_t used_memory = 0;
86 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
87
88 static void zmalloc_default_oom(size_t size) {
89 fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
90 size);
91 fflush(stderr);
92 abort();
93 }
94
95 static void (*zmalloc_oom_handler)(size_t) = zmalloc_default_oom;
96
97 void *zmalloc(size_t size) {
98 void *ptr = malloc(size+PREFIX_SIZE);
99
100 if (!ptr) zmalloc_oom_handler(size);
101 #ifdef HAVE_MALLOC_SIZE
102 update_zmalloc_stat_alloc(zmalloc_size(ptr));
103 return ptr;
104 #else
105 *((size_t*)ptr) = size;
106 update_zmalloc_stat_alloc(size+PREFIX_SIZE);
107 return (char*)ptr+PREFIX_SIZE;
108 #endif
109 }
110
111 /* Allocation and free functions that bypass the thread cache
112 * and go straight to the allocator arena bins.
113 * Currently implemented only for jemalloc. Used for online defragmentation. */
114 #ifdef HAVE_DEFRAG
115 void *zmalloc_no_tcache(size_t size) {
116 void *ptr = mallocx(size+PREFIX_SIZE, MALLOCX_TCACHE_NONE);
117 if (!ptr) zmalloc_oom_handler(size);
118 update_zmalloc_stat_alloc(zmalloc_size(ptr));
119 return ptr;
120 }
121
122 void zfree_no_tcache(void *ptr) {
123 if (ptr == NULL) return;
124 update_zmalloc_stat_free(zmalloc_size(ptr));
125 dallocx(ptr, MALLOCX_TCACHE_NONE);
126 }
127 #endif
128
129 void *zcalloc(size_t size) {
130 void *ptr = calloc(1, size+PREFIX_SIZE);
131
132 if (!ptr) zmalloc_oom_handler(size);
133 #ifdef HAVE_MALLOC_SIZE
134 update_zmalloc_stat_alloc(zmalloc_size(ptr));
135 return ptr;
136 #else
137 *((size_t*)ptr) = size;
138 update_zmalloc_stat_alloc(size+PREFIX_SIZE);
139 return (char*)ptr+PREFIX_SIZE;
140 #endif
141 }
142
143 void *zrealloc(void *ptr, size_t size) {
144 #ifndef HAVE_MALLOC_SIZE
145 void *realptr;
146 #endif
147 size_t oldsize;
148 void *newptr;
149
150 if (ptr == NULL) return zmalloc(size);
151 #ifdef HAVE_MALLOC_SIZE
152 oldsize = zmalloc_size(ptr);
153 newptr = realloc(ptr,size);
154 if (!newptr) zmalloc_oom_handler(size);
155
156 update_zmalloc_stat_free(oldsize);
157 update_zmalloc_stat_alloc(zmalloc_size(newptr));
158 return newptr;
159 #else
160 realptr = (char*)ptr-PREFIX_SIZE;
161 oldsize = *((size_t*)realptr);
162 newptr = realloc(realptr,size+PREFIX_SIZE);
163 if (!newptr) zmalloc_oom_handler(size);
164
165 *((size_t*)newptr) = size;
166 update_zmalloc_stat_free(oldsize);
167 update_zmalloc_stat_alloc(size);
168 return (char*)newptr+PREFIX_SIZE;
169 #endif
170 }
171
172 /* Provide zmalloc_size() for systems where this function is not provided by
173 * malloc itself, given that in that case we store a header with this
174 * information as the first bytes of every allocation. */
175 #ifndef HAVE_MALLOC_SIZE
176 size_t zmalloc_size(void *ptr) {
177 void *realptr = (char*)ptr-PREFIX_SIZE;
178 size_t size = *((size_t*)realptr);
179 /* Assume at least that all the allocations are padded at sizeof(long) by
180 * the underlying allocator. */
181 if (size&(sizeof(long)-1)) size += sizeof(long)-(size&(sizeof(long)-1));
182 return size+PREFIX_SIZE;
183 }
184 #endif
185
186 void zfree(void *ptr) {
187 #ifndef HAVE_MALLOC_SIZE
188 void *realptr;
189 size_t oldsize;
190 #endif
191
192 if (ptr == NULL) return;
193 #ifdef HAVE_MALLOC_SIZE
194 update_zmalloc_stat_free(zmalloc_size(ptr));
195 free(ptr);
196 #else
197 realptr = (char*)ptr-PREFIX_SIZE;
198 oldsize = *((size_t*)realptr);
199 update_zmalloc_stat_free(oldsize+PREFIX_SIZE);
200 free(realptr);
201 #endif
202 }
203
204 char *zstrdup(const char *s) {
205 size_t l = strlen(s)+1;
206 char *p = zmalloc(l);
207
208 memcpy(p,s,l);
209 return p;
210 }
211
212 size_t zmalloc_used_memory(void) {
213 size_t um;
214 atomicGet(used_memory,um);
215 return um;
216 }
217
218 void zmalloc_set_oom_handler(void (*oom_handler)(size_t)) {
219 zmalloc_oom_handler = oom_handler;
220 }
221
222 /* Get the RSS information in an OS-specific way.
223 *
224 * WARNING: the function zmalloc_get_rss() is not designed to be fast
225 * and may not be called in the busy loops where Redis tries to release
226 * memory expiring or swapping out objects.
227 *
228 * For this kind of "fast RSS reporting" usages use instead the
229 * function RedisEstimateRSS() that is a much faster (and less precise)
230 * version of the function. */
231
232 #if defined(HAVE_PROC_STAT)
233 #include <unistd.h>
234 #include <sys/types.h>
235 #include <sys/stat.h>
236 #include <fcntl.h>
237
238 size_t zmalloc_get_rss(void) {
239 int page = sysconf(_SC_PAGESIZE);
240 size_t rss;
241 char buf[4096];
242 char filename[256];
243 int fd, count;
244 char *p, *x;
245
246 snprintf(filename,256,"/proc/%d/stat",getpid());
247 if ((fd = open(filename,O_RDONLY)) == -1) return 0;
248 if (read(fd,buf,4096) <= 0) {
249 close(fd);
250 return 0;
251 }
252 close(fd);
253
254 p = buf;
255 count = 23; /* RSS is the 24th field in /proc/<pid>/stat */
256 while(p && count--) {
257 p = strchr(p,' ');
258 if (p) p++;
259 }
260 if (!p) return 0;
261 x = strchr(p,' ');
262 if (!x) return 0;
263 *x = '\0';
264
265 rss = strtoll(p,NULL,10);
266 rss *= page;
267 return rss;
268 }
269 #elif defined(HAVE_TASKINFO)
270 #include <unistd.h>
271 #include <stdio.h>
272 #include <stdlib.h>
273 #include <sys/types.h>
274 #include <sys/sysctl.h>
275 #include <mach/task.h>
276 #include <mach/mach_init.h>
277
278 size_t zmalloc_get_rss(void) {
279 task_t task = MACH_PORT_NULL;
280 struct task_basic_info t_info;
281 mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
282
283 if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS)
284 return 0;
285 task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
286
287 return t_info.resident_size;
288 }
289 #else
290 size_t zmalloc_get_rss(void) {
291 /* If we can't get the RSS in an OS-specific way for this system just
292 * return the memory usage we estimated in zmalloc()..
293 *
294 * Fragmentation will appear to be always 1 (no fragmentation)
295 * of course... */
296 return zmalloc_used_memory();
297 }
298 #endif
299
300 /* Fragmentation = RSS / allocated-bytes */
301 float zmalloc_get_fragmentation_ratio(size_t rss) {
302 return (float)rss/zmalloc_used_memory();
303 }
304
305 /* Get the sum of the specified field (converted form kb to bytes) in
306 * /proc/self/smaps. The field must be specified with trailing ":" as it
307 * apperas in the smaps output.
308 *
309 * If a pid is specified, the information is extracted for such a pid,
310 * otherwise if pid is -1 the information is reported is about the
311 * current process.
312 *
313 * Example: zmalloc_get_smap_bytes_by_field("Rss:",-1);
314 */
315 #if defined(HAVE_PROC_SMAPS)
316 size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
317 char line[1024];
318 size_t bytes = 0;
319 int flen = strlen(field);
320 FILE *fp;
321
322 if (pid == -1) {
323 fp = fopen("/proc/self/smaps","r");
324 } else {
325 char filename[128];
326 snprintf(filename,sizeof(filename),"/proc/%ld/smaps",pid);
327 fp = fopen(filename,"r");
328 }
329
330 if (!fp) return 0;
331 while(fgets(line,sizeof(line),fp) != NULL) {
332 if (strncmp(line,field,flen) == 0) {
333 char *p = strchr(line,'k');
334 if (p) {
335 *p = '\0';
336 bytes += strtol(line+flen,NULL,10) * 1024;
337 }
338 }
339 }
340 fclose(fp);
341 return bytes;
342 }
343 #else
344 size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
345 ((void) field);
346 ((void) pid);
347 return 0;
348 }
349 #endif
350
351 size_t zmalloc_get_private_dirty(long pid) {
352 return zmalloc_get_smap_bytes_by_field("Private_Dirty:",pid);
353 }
354
355 /* Returns the size of physical memory (RAM) in bytes.
356 * It looks ugly, but this is the cleanest way to achive cross platform results.
357 * Cleaned up from:
358 *
359 * http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
360 *
361 * Note that this function:
362 * 1) Was released under the following CC attribution license:
363 * http://creativecommons.org/licenses/by/3.0/deed.en_US.
364 * 2) Was originally implemented by David Robert Nadeau.
365 * 3) Was modified for Redis by Matt Stancliff.
366 * 4) This note exists in order to comply with the original license.
367 */
368 size_t zmalloc_get_memory_size(void) {
369 #if defined(__unix__) || defined(__unix) || defined(unix) || \
370 (defined(__APPLE__) && defined(__MACH__))
371 #if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
372 int mib[2];
373 mib[0] = CTL_HW;
374 #if defined(HW_MEMSIZE)
375 mib[1] = HW_MEMSIZE; /* OSX. --------------------- */
376 #elif defined(HW_PHYSMEM64)
377 mib[1] = HW_PHYSMEM64; /* NetBSD, OpenBSD. --------- */
378 #endif
379 int64_t size = 0; /* 64-bit */
380 size_t len = sizeof(size);
381 if (sysctl( mib, 2, &size, &len, NULL, 0) == 0)
382 return (size_t)size;
383 return 0L; /* Failed? */
384
385 #elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
386 /* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
387 return (size_t)sysconf(_SC_PHYS_PAGES) * (size_t)sysconf(_SC_PAGESIZE);
388
389 #elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
390 /* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
391 int mib[2];
392 mib[0] = CTL_HW;
393 #if defined(HW_REALMEM)
394 mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */
395 #elif defined(HW_PYSMEM)
396 mib[1] = HW_PHYSMEM; /* Others. ------------------ */
397 #endif
398 unsigned int size = 0; /* 32-bit */
399 size_t len = sizeof(size);
400 if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
401 return (size_t)size;
402 return 0L; /* Failed? */
403 #else
404 return 0L; /* Unknown method to get the data. */
405 #endif
406 #else
407 return 0L; /* Unknown OS. */
408 #endif
409 }
410
411