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10a89ef0 | 1 | /* Copyright (c) 2010, 2012, 2013 Nicira, Inc. |
ce887677 BP |
2 | * |
3 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | * you may not use this file except in compliance with the License. | |
5 | * You may obtain a copy of the License at: | |
6 | * | |
7 | * http://www.apache.org/licenses/LICENSE-2.0 | |
8 | * | |
9 | * Unless required by applicable law or agreed to in writing, software | |
10 | * distributed under the License is distributed on an "AS IS" BASIS, | |
11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | * See the License for the specific language governing permissions and | |
13 | * limitations under the License. | |
14 | */ | |
15 | ||
16 | #include <config.h> | |
17 | ||
57c8677b BP |
18 | #include "system-stats.h" |
19 | ||
ce887677 BP |
20 | #include <ctype.h> |
21 | #include <dirent.h> | |
22 | #include <errno.h> | |
23 | #if HAVE_MNTENT_H | |
24 | #include <mntent.h> | |
25 | #endif | |
ce887677 BP |
26 | #include <stdint.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #if HAVE_SYS_STATVFS_H | |
30 | #include <sys/statvfs.h> | |
31 | #endif | |
32 | #include <unistd.h> | |
33 | ||
34 | #include "daemon.h" | |
35 | #include "dirs.h" | |
36 | #include "dynamic-string.h" | |
35a22d8c | 37 | #include "json.h" |
59987a62 | 38 | #include "latch.h" |
35a22d8c | 39 | #include "ofpbuf.h" |
59987a62 | 40 | #include "ovs-thread.h" |
35a22d8c | 41 | #include "poll-loop.h" |
ce887677 | 42 | #include "shash.h" |
57c8677b | 43 | #include "smap.h" |
ce887677 BP |
44 | #include "timeval.h" |
45 | #include "vlog.h" | |
46 | ||
d98e6007 | 47 | VLOG_DEFINE_THIS_MODULE(system_stats); |
ce887677 BP |
48 | |
49 | /* #ifdefs make it a pain to maintain code: you have to try to build both ways. | |
50 | * Thus, this file tries to compile as much of the code as possible regardless | |
361906b1 EJ |
51 | * of the target, by writing "if (LINUX_DATAPATH)" instead of "#ifdef |
52 | * __linux__" where this is possible. */ | |
53 | #ifdef LINUX_DATAPATH | |
ce887677 | 54 | #include <asm/param.h> |
ce887677 | 55 | #else |
361906b1 | 56 | #define LINUX_DATAPATH 0 |
ce887677 BP |
57 | #endif |
58 | ||
59 | static void | |
57c8677b | 60 | get_cpu_cores(struct smap *stats) |
ce887677 BP |
61 | { |
62 | long int n_cores = sysconf(_SC_NPROCESSORS_ONLN); | |
63 | if (n_cores > 0) { | |
57c8677b | 64 | smap_add_format(stats, "cpu", "%ld", n_cores); |
ce887677 BP |
65 | } |
66 | } | |
67 | ||
68 | static void | |
57c8677b | 69 | get_load_average(struct smap *stats OVS_UNUSED) |
ce887677 BP |
70 | { |
71 | #if HAVE_GETLOADAVG | |
72 | double loadavg[3]; | |
73 | ||
74 | if (getloadavg(loadavg, 3) == 3) { | |
57c8677b BP |
75 | smap_add_format(stats, "load_average", "%.2f,%.2f,%.2f", |
76 | loadavg[0], loadavg[1], loadavg[2]); | |
ce887677 BP |
77 | } |
78 | #endif | |
79 | } | |
80 | ||
81 | static unsigned int | |
82 | get_page_size(void) | |
83 | { | |
84 | static unsigned int cached; | |
85 | ||
86 | if (!cached) { | |
87 | long int value = sysconf(_SC_PAGESIZE); | |
88 | if (value >= 0) { | |
89 | cached = value; | |
90 | } | |
91 | } | |
92 | ||
93 | return cached; | |
94 | } | |
95 | ||
96 | static void | |
57c8677b | 97 | get_memory_stats(struct smap *stats) |
ce887677 | 98 | { |
361906b1 | 99 | if (!LINUX_DATAPATH) { |
ce887677 | 100 | unsigned int pagesize = get_page_size(); |
a0e21f58 | 101 | #ifdef _SC_PHYS_PAGES |
ce887677 | 102 | long int phys_pages = sysconf(_SC_PHYS_PAGES); |
a0e21f58 YT |
103 | #else |
104 | long int phys_pages = 0; | |
105 | #endif | |
6ca00f6f | 106 | #ifdef _SC_AVPHYS_PAGES |
ce887677 | 107 | long int avphys_pages = sysconf(_SC_AVPHYS_PAGES); |
6ca00f6f ETN |
108 | #else |
109 | long int avphys_pages = 0; | |
110 | #endif | |
ce887677 BP |
111 | int mem_total, mem_used; |
112 | ||
113 | if (pagesize <= 0 || phys_pages <= 0 || avphys_pages <= 0) { | |
114 | return; | |
115 | } | |
116 | ||
117 | mem_total = phys_pages * (pagesize / 1024); | |
118 | mem_used = (phys_pages - avphys_pages) * (pagesize / 1024); | |
57c8677b | 119 | smap_add_format(stats, "memory", "%d,%d", mem_total, mem_used); |
ce887677 BP |
120 | } else { |
121 | static const char file_name[] = "/proc/meminfo"; | |
122 | int mem_used, mem_cache, swap_used; | |
123 | int mem_free = 0; | |
124 | int buffers = 0; | |
125 | int cached = 0; | |
126 | int swap_free = 0; | |
127 | int mem_total = 0; | |
128 | int swap_total = 0; | |
129 | struct shash dict; | |
130 | char line[128]; | |
131 | FILE *stream; | |
132 | ||
133 | stream = fopen(file_name, "r"); | |
134 | if (!stream) { | |
10a89ef0 BP |
135 | VLOG_WARN_ONCE("%s: open failed (%s)", |
136 | file_name, ovs_strerror(errno)); | |
ce887677 BP |
137 | return; |
138 | } | |
139 | ||
140 | shash_init(&dict); | |
141 | shash_add(&dict, "MemTotal", &mem_total); | |
142 | shash_add(&dict, "MemFree", &mem_free); | |
143 | shash_add(&dict, "Buffers", &buffers); | |
144 | shash_add(&dict, "Cached", &cached); | |
145 | shash_add(&dict, "SwapTotal", &swap_total); | |
146 | shash_add(&dict, "SwapFree", &swap_free); | |
147 | while (fgets(line, sizeof line, stream)) { | |
148 | char key[16]; | |
149 | int value; | |
150 | ||
c2c28dfd | 151 | if (ovs_scan(line, "%15[^:]: %u", key, &value)) { |
ce887677 BP |
152 | int *valuep = shash_find_data(&dict, key); |
153 | if (valuep) { | |
154 | *valuep = value; | |
155 | } | |
156 | } | |
157 | } | |
158 | fclose(stream); | |
159 | shash_destroy(&dict); | |
160 | ||
161 | mem_used = mem_total - mem_free; | |
162 | mem_cache = buffers + cached; | |
163 | swap_used = swap_total - swap_free; | |
57c8677b BP |
164 | smap_add_format(stats, "memory", "%d,%d,%d,%d,%d", |
165 | mem_total, mem_used, mem_cache, swap_total, swap_used); | |
ce887677 BP |
166 | } |
167 | } | |
168 | ||
169 | /* Returns the time at which the system booted, as the number of milliseconds | |
170 | * since the epoch, or 0 if the time of boot cannot be determined. */ | |
171 | static long long int | |
172 | get_boot_time(void) | |
173 | { | |
174 | static long long int cache_expiration = LLONG_MIN; | |
175 | static long long int boot_time; | |
176 | ||
cb22974d | 177 | ovs_assert(LINUX_DATAPATH); |
ce887677 BP |
178 | |
179 | if (time_msec() >= cache_expiration) { | |
180 | static const char stat_file[] = "/proc/stat"; | |
181 | char line[128]; | |
182 | FILE *stream; | |
183 | ||
184 | cache_expiration = time_msec() + 5 * 1000; | |
185 | ||
186 | stream = fopen(stat_file, "r"); | |
187 | if (!stream) { | |
10a89ef0 BP |
188 | VLOG_ERR_ONCE("%s: open failed (%s)", |
189 | stat_file, ovs_strerror(errno)); | |
ce887677 BP |
190 | return boot_time; |
191 | } | |
192 | ||
193 | while (fgets(line, sizeof line, stream)) { | |
194 | long long int btime; | |
c2c28dfd | 195 | if (ovs_scan(line, "btime %lld", &btime)) { |
ce887677 BP |
196 | boot_time = btime * 1000; |
197 | goto done; | |
198 | } | |
199 | } | |
200 | VLOG_ERR_ONCE("%s: btime not found", stat_file); | |
201 | done: | |
202 | fclose(stream); | |
203 | } | |
204 | return boot_time; | |
205 | } | |
206 | ||
207 | static unsigned long long int | |
208 | ticks_to_ms(unsigned long long int ticks) | |
209 | { | |
cb22974d | 210 | ovs_assert(LINUX_DATAPATH); |
ce887677 BP |
211 | |
212 | #ifndef USER_HZ | |
213 | #define USER_HZ 100 | |
214 | #endif | |
215 | ||
216 | #if USER_HZ == 100 /* Common case. */ | |
217 | return ticks * (1000 / USER_HZ); | |
218 | #else /* Alpha and some other architectures. */ | |
219 | double factor = 1000.0 / USER_HZ; | |
220 | return ticks * factor + 0.5; | |
221 | #endif | |
222 | } | |
223 | ||
224 | struct raw_process_info { | |
225 | unsigned long int vsz; /* Virtual size, in kB. */ | |
226 | unsigned long int rss; /* Resident set size, in kB. */ | |
227 | long long int uptime; /* ms since started. */ | |
228 | long long int cputime; /* ms of CPU used during 'uptime'. */ | |
229 | pid_t ppid; /* Parent. */ | |
230 | char name[18]; /* Name (surrounded by parentheses). */ | |
231 | }; | |
232 | ||
233 | static bool | |
234 | get_raw_process_info(pid_t pid, struct raw_process_info *raw) | |
235 | { | |
236 | unsigned long long int vsize, rss, start_time, utime, stime; | |
237 | long long int start_msec; | |
238 | unsigned long ppid; | |
239 | char file_name[128]; | |
240 | FILE *stream; | |
241 | int n; | |
242 | ||
cb22974d | 243 | ovs_assert(LINUX_DATAPATH); |
ce887677 BP |
244 | |
245 | sprintf(file_name, "/proc/%lu/stat", (unsigned long int) pid); | |
246 | stream = fopen(file_name, "r"); | |
247 | if (!stream) { | |
10a89ef0 BP |
248 | VLOG_ERR_ONCE("%s: open failed (%s)", |
249 | file_name, ovs_strerror(errno)); | |
ce887677 BP |
250 | return false; |
251 | } | |
252 | ||
253 | n = fscanf(stream, | |
254 | "%*d " /* (1. pid) */ | |
255 | "%17s " /* 2. process name */ | |
256 | "%*c " /* (3. state) */ | |
257 | "%lu " /* 4. ppid */ | |
258 | "%*d " /* (5. pgid) */ | |
259 | "%*d " /* (6. sid) */ | |
260 | "%*d " /* (7. tty_nr) */ | |
261 | "%*d " /* (8. tty_pgrp) */ | |
262 | "%*u " /* (9. flags) */ | |
263 | "%*u " /* (10. min_flt) */ | |
264 | "%*u " /* (11. cmin_flt) */ | |
265 | "%*u " /* (12. maj_flt) */ | |
266 | "%*u " /* (13. cmaj_flt) */ | |
267 | "%llu " /* 14. utime */ | |
268 | "%llu " /* 15. stime */ | |
269 | "%*d " /* (16. cutime) */ | |
270 | "%*d " /* (17. cstime) */ | |
271 | "%*d " /* (18. priority) */ | |
272 | "%*d " /* (19. nice) */ | |
273 | "%*d " /* (20. num_threads) */ | |
274 | "%*d " /* (21. always 0) */ | |
275 | "%llu " /* 22. start_time */ | |
276 | "%llu " /* 23. vsize */ | |
277 | "%llu " /* 24. rss */ | |
278 | #if 0 | |
279 | /* These are here for documentation but #if'd out to save | |
280 | * actually parsing them from the stream for no benefit. */ | |
281 | "%*lu " /* (25. rsslim) */ | |
282 | "%*lu " /* (26. start_code) */ | |
283 | "%*lu " /* (27. end_code) */ | |
284 | "%*lu " /* (28. start_stack) */ | |
285 | "%*lu " /* (29. esp) */ | |
286 | "%*lu " /* (30. eip) */ | |
287 | "%*lu " /* (31. pending signals) */ | |
288 | "%*lu " /* (32. blocked signals) */ | |
289 | "%*lu " /* (33. ignored signals) */ | |
290 | "%*lu " /* (34. caught signals) */ | |
291 | "%*lu " /* (35. whcan) */ | |
292 | "%*lu " /* (36. always 0) */ | |
293 | "%*lu " /* (37. always 0) */ | |
294 | "%*d " /* (38. exit_signal) */ | |
295 | "%*d " /* (39. task_cpu) */ | |
296 | "%*u " /* (40. rt_priority) */ | |
297 | "%*u " /* (41. policy) */ | |
298 | "%*llu " /* (42. blkio_ticks) */ | |
299 | "%*lu " /* (43. gtime) */ | |
300 | "%*ld" /* (44. cgtime) */ | |
301 | #endif | |
302 | , raw->name, &ppid, &utime, &stime, &start_time, &vsize, &rss); | |
303 | fclose(stream); | |
304 | if (n != 7) { | |
305 | VLOG_ERR_ONCE("%s: fscanf failed", file_name); | |
306 | return false; | |
307 | } | |
308 | ||
309 | start_msec = get_boot_time() + ticks_to_ms(start_time); | |
310 | ||
311 | raw->vsz = vsize / 1024; | |
312 | raw->rss = rss * (getpagesize() / 1024); | |
313 | raw->uptime = time_wall_msec() - start_msec; | |
314 | raw->cputime = ticks_to_ms(utime + stime); | |
315 | raw->ppid = ppid; | |
316 | ||
317 | return true; | |
318 | } | |
319 | ||
320 | static int | |
321 | count_crashes(pid_t pid) | |
322 | { | |
323 | char file_name[128]; | |
324 | const char *paren; | |
325 | char line[128]; | |
326 | int crashes = 0; | |
327 | FILE *stream; | |
328 | ||
cb22974d | 329 | ovs_assert(LINUX_DATAPATH); |
ce887677 BP |
330 | |
331 | sprintf(file_name, "/proc/%lu/cmdline", (unsigned long int) pid); | |
332 | stream = fopen(file_name, "r"); | |
333 | if (!stream) { | |
10a89ef0 | 334 | VLOG_WARN_ONCE("%s: open failed (%s)", file_name, ovs_strerror(errno)); |
ce887677 BP |
335 | goto exit; |
336 | } | |
337 | ||
338 | if (!fgets(line, sizeof line, stream)) { | |
339 | VLOG_WARN_ONCE("%s: read failed (%s)", file_name, | |
10a89ef0 | 340 | feof(stream) ? "end of file" : ovs_strerror(errno)); |
ce887677 BP |
341 | goto exit_close; |
342 | } | |
343 | ||
344 | paren = strchr(line, '('); | |
345 | if (paren) { | |
346 | int x; | |
c2c28dfd | 347 | if (ovs_scan(paren + 1, "%d", &x)) { |
ce887677 BP |
348 | crashes = x; |
349 | } | |
350 | } | |
351 | ||
352 | exit_close: | |
353 | fclose(stream); | |
354 | exit: | |
355 | return crashes; | |
356 | } | |
357 | ||
358 | struct process_info { | |
359 | unsigned long int vsz; /* Virtual size, in kB. */ | |
360 | unsigned long int rss; /* Resident set size, in kB. */ | |
361 | long long int booted; /* ms since monitor started. */ | |
362 | int crashes; /* # of crashes (usually 0). */ | |
363 | long long int uptime; /* ms since last (re)started by monitor. */ | |
364 | long long int cputime; /* ms of CPU used during 'uptime'. */ | |
365 | }; | |
366 | ||
367 | static bool | |
368 | get_process_info(pid_t pid, struct process_info *pinfo) | |
369 | { | |
370 | struct raw_process_info child; | |
371 | ||
cb22974d | 372 | ovs_assert(LINUX_DATAPATH); |
ce887677 BP |
373 | if (!get_raw_process_info(pid, &child)) { |
374 | return false; | |
375 | } | |
376 | ||
377 | pinfo->vsz = child.vsz; | |
378 | pinfo->rss = child.rss; | |
379 | pinfo->booted = child.uptime; | |
380 | pinfo->crashes = 0; | |
381 | pinfo->uptime = child.uptime; | |
382 | pinfo->cputime = child.cputime; | |
383 | ||
384 | if (child.ppid) { | |
385 | struct raw_process_info parent; | |
386 | ||
387 | get_raw_process_info(child.ppid, &parent); | |
388 | if (!strcmp(child.name, parent.name)) { | |
389 | pinfo->booted = parent.uptime; | |
390 | pinfo->crashes = count_crashes(child.ppid); | |
391 | } | |
392 | } | |
393 | ||
394 | return true; | |
395 | } | |
396 | ||
397 | static void | |
57c8677b | 398 | get_process_stats(struct smap *stats) |
ce887677 BP |
399 | { |
400 | struct dirent *de; | |
401 | DIR *dir; | |
402 | ||
b43c6fe2 | 403 | dir = opendir(ovs_rundir()); |
ce887677 | 404 | if (!dir) { |
10a89ef0 BP |
405 | VLOG_ERR_ONCE("%s: open failed (%s)", |
406 | ovs_rundir(), ovs_strerror(errno)); | |
ce887677 BP |
407 | return; |
408 | } | |
409 | ||
410 | while ((de = readdir(dir)) != NULL) { | |
411 | struct process_info pinfo; | |
ce887677 BP |
412 | char *file_name; |
413 | char *extension; | |
57c8677b | 414 | char *key; |
ce887677 BP |
415 | pid_t pid; |
416 | ||
417 | #ifdef _DIRENT_HAVE_D_TYPE | |
418 | if (de->d_type != DT_UNKNOWN && de->d_type != DT_REG) { | |
419 | continue; | |
420 | } | |
421 | #endif | |
422 | ||
423 | extension = strrchr(de->d_name, '.'); | |
424 | if (!extension || strcmp(extension, ".pid")) { | |
425 | continue; | |
426 | } | |
427 | ||
b43c6fe2 | 428 | file_name = xasprintf("%s/%s", ovs_rundir(), de->d_name); |
ce887677 BP |
429 | pid = read_pidfile(file_name); |
430 | free(file_name); | |
8da7ca87 | 431 | if (pid < 0) { |
ce887677 BP |
432 | continue; |
433 | } | |
434 | ||
435 | key = xasprintf("process_%.*s", | |
436 | (int) (extension - de->d_name), de->d_name); | |
57c8677b | 437 | if (!smap_get(stats, key)) { |
361906b1 | 438 | if (LINUX_DATAPATH && get_process_info(pid, &pinfo)) { |
57c8677b BP |
439 | smap_add_format(stats, key, "%lu,%lu,%lld,%d,%lld,%lld", |
440 | pinfo.vsz, pinfo.rss, pinfo.cputime, | |
441 | pinfo.crashes, pinfo.booted, pinfo.uptime); | |
442 | } else { | |
443 | smap_add(stats, key, ""); | |
444 | } | |
ce887677 | 445 | } |
57c8677b | 446 | free(key); |
ce887677 BP |
447 | } |
448 | ||
449 | closedir(dir); | |
450 | } | |
451 | ||
452 | static void | |
57c8677b | 453 | get_filesys_stats(struct smap *stats OVS_UNUSED) |
ce887677 | 454 | { |
ffb1cfd1 | 455 | #if HAVE_GETMNTENT_R && HAVE_STATVFS |
ce887677 | 456 | static const char file_name[] = "/etc/mtab"; |
ffb1cfd1 | 457 | struct mntent mntent; |
ce887677 | 458 | struct mntent *me; |
ffb1cfd1 | 459 | char buf[4096]; |
ce887677 BP |
460 | FILE *stream; |
461 | struct ds s; | |
462 | ||
463 | stream = setmntent(file_name, "r"); | |
464 | if (!stream) { | |
10a89ef0 | 465 | VLOG_ERR_ONCE("%s: open failed (%s)", file_name, ovs_strerror(errno)); |
ce887677 BP |
466 | return; |
467 | } | |
468 | ||
469 | ds_init(&s); | |
ffb1cfd1 | 470 | while ((me = getmntent_r(stream, &mntent, buf, sizeof buf)) != NULL) { |
ce887677 BP |
471 | unsigned long long int total, free; |
472 | struct statvfs vfs; | |
473 | char *p; | |
474 | ||
475 | /* Skip non-local and read-only filesystems. */ | |
476 | if (strncmp(me->mnt_fsname, "/dev", 4) | |
477 | || !strstr(me->mnt_opts, "rw")) { | |
478 | continue; | |
479 | } | |
480 | ||
481 | /* Given the mount point we can stat the file system. */ | |
482 | if (statvfs(me->mnt_dir, &vfs) && vfs.f_flag & ST_RDONLY) { | |
483 | /* That's odd... */ | |
484 | continue; | |
485 | } | |
486 | ||
487 | /* Now format the data. */ | |
488 | if (s.length) { | |
489 | ds_put_char(&s, ' '); | |
490 | } | |
491 | for (p = me->mnt_dir; *p != '\0'; p++) { | |
492 | ds_put_char(&s, *p == ' ' || *p == ',' ? '_' : *p); | |
493 | } | |
494 | total = (unsigned long long int) vfs.f_frsize * vfs.f_blocks / 1024; | |
495 | free = (unsigned long long int) vfs.f_frsize * vfs.f_bfree / 1024; | |
496 | ds_put_format(&s, ",%llu,%llu", total, total - free); | |
497 | } | |
498 | endmntent(stream); | |
499 | ||
500 | if (s.length) { | |
57c8677b | 501 | smap_add(stats, "file_systems", ds_cstr(&s)); |
ce887677 BP |
502 | } |
503 | ds_destroy(&s); | |
ffb1cfd1 | 504 | #endif /* HAVE_GETMNTENT_R && HAVE_STATVFS */ |
ce887677 | 505 | } |
35a22d8c BP |
506 | \f |
507 | #define SYSTEM_STATS_INTERVAL (5 * 1000) /* In milliseconds. */ | |
ce887677 | 508 | |
834d6caf | 509 | static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER; |
59987a62 | 510 | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
97be1538 | 511 | static struct latch latch OVS_GUARDED_BY(mutex); |
59987a62 | 512 | static bool enabled; |
97be1538 EJ |
513 | static bool started OVS_GUARDED_BY(mutex); |
514 | static struct smap *system_stats OVS_GUARDED_BY(mutex); | |
59987a62 BP |
515 | |
516 | static void *system_stats_thread_func(void *); | |
517 | static void discard_stats(void); | |
35a22d8c | 518 | |
5a13f2f4 | 519 | /* Enables or disables system stats collection, according to 'enable'. */ |
ce887677 | 520 | void |
5a13f2f4 | 521 | system_stats_enable(bool enable) |
35a22d8c | 522 | { |
59987a62 | 523 | if (enabled != enable) { |
97be1538 | 524 | ovs_mutex_lock(&mutex); |
59987a62 BP |
525 | if (enable) { |
526 | if (!started) { | |
527 | xpthread_create(NULL, NULL, system_stats_thread_func, NULL); | |
528 | latch_init(&latch); | |
529 | started = true; | |
530 | } | |
531 | discard_stats(); | |
532 | xpthread_cond_signal(&cond); | |
533 | } | |
534 | enabled = enable; | |
97be1538 | 535 | ovs_mutex_unlock(&mutex); |
35a22d8c BP |
536 | } |
537 | } | |
538 | ||
539 | /* Tries to obtain a new snapshot of system stats every SYSTEM_STATS_INTERVAL | |
540 | * milliseconds. | |
541 | * | |
542 | * When a new snapshot is available (which only occurs if system stats are | |
543 | * enabled), returns it as an smap owned by the caller. The caller must use | |
5a13f2f4 | 544 | * both smap_destroy() and free() to completely free the returned data. |
35a22d8c BP |
545 | * |
546 | * When no new snapshot is available, returns NULL. */ | |
547 | struct smap * | |
548 | system_stats_run(void) | |
ce887677 | 549 | { |
59987a62 | 550 | struct smap *stats = NULL; |
5a13f2f4 | 551 | |
97be1538 | 552 | ovs_mutex_lock(&mutex); |
59987a62 BP |
553 | if (system_stats) { |
554 | latch_poll(&latch); | |
5a13f2f4 | 555 | |
59987a62 BP |
556 | if (enabled) { |
557 | stats = system_stats; | |
558 | system_stats = NULL; | |
559 | } else { | |
560 | discard_stats(); | |
561 | } | |
35a22d8c | 562 | } |
97be1538 | 563 | ovs_mutex_unlock(&mutex); |
35a22d8c | 564 | |
59987a62 | 565 | return stats; |
35a22d8c BP |
566 | } |
567 | ||
568 | /* Causes poll_block() to wake up when system_stats_run() needs to be | |
569 | * called. */ | |
570 | void | |
571 | system_stats_wait(void) | |
572 | { | |
59987a62 BP |
573 | if (enabled) { |
574 | latch_wait(&latch); | |
575 | } | |
576 | } | |
577 | ||
578 | static void | |
344e21d4 | 579 | discard_stats(void) OVS_REQUIRES(mutex) |
59987a62 BP |
580 | { |
581 | if (system_stats) { | |
582 | smap_destroy(system_stats); | |
583 | free(system_stats); | |
584 | system_stats = NULL; | |
585 | } | |
586 | } | |
587 | ||
588 | static void * NO_RETURN | |
589 | system_stats_thread_func(void *arg OVS_UNUSED) | |
590 | { | |
591 | pthread_detach(pthread_self()); | |
592 | ||
593 | for (;;) { | |
594 | long long int next_refresh; | |
595 | struct smap *stats; | |
596 | ||
97be1538 | 597 | ovs_mutex_lock(&mutex); |
59987a62 | 598 | while (!enabled) { |
97be1538 | 599 | ovs_mutex_cond_wait(&cond, &mutex); |
59987a62 | 600 | } |
97be1538 | 601 | ovs_mutex_unlock(&mutex); |
59987a62 BP |
602 | |
603 | stats = xmalloc(sizeof *stats); | |
604 | smap_init(stats); | |
605 | get_cpu_cores(stats); | |
606 | get_load_average(stats); | |
607 | get_memory_stats(stats); | |
608 | get_process_stats(stats); | |
609 | get_filesys_stats(stats); | |
610 | ||
97be1538 | 611 | ovs_mutex_lock(&mutex); |
59987a62 BP |
612 | discard_stats(); |
613 | system_stats = stats; | |
614 | latch_set(&latch); | |
97be1538 | 615 | ovs_mutex_unlock(&mutex); |
59987a62 BP |
616 | |
617 | next_refresh = time_msec() + SYSTEM_STATS_INTERVAL; | |
618 | do { | |
619 | poll_timer_wait_until(next_refresh); | |
620 | poll_block(); | |
621 | } while (time_msec() < next_refresh); | |
35a22d8c BP |
622 | } |
623 | } |