/usr/src/openvswitch-1.4.0/vswitchd/system-stats.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#if HAVE_MNTENT_H
#include <mntent.h>
#endif
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#if HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#include <unistd.h>
#include "daemon.h"
#include "dirs.h"
#include "dynamic-string.h"
#include "shash.h"
#include "system-stats.h"
#include "timeval.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(system_stats);
/* #ifdefs make it a pain to maintain code: you have to try to build both ways.
* Thus, this file tries to compile as much of the code as possible regardless
* of the target, by writing "if (LINUX)" instead of "#ifdef __linux__" where
* this is possible. */
#ifdef __linux__
#include <asm/param.h>
#define LINUX 1
#else
#define LINUX 0
#endif
static void
get_cpu_cores(struct shash *stats)
{
long int n_cores = sysconf(_SC_NPROCESSORS_ONLN);
if (n_cores > 0) {
shash_add(stats, "cpu", xasprintf("%ld", n_cores));
}
}
static void
get_load_average(struct shash *stats OVS_UNUSED)
{
#if HAVE_GETLOADAVG
double loadavg[3];
if (getloadavg(loadavg, 3) == 3) {
shash_add(stats, "load_average",
xasprintf("%.2f,%.2f,%.2f",
loadavg[0], loadavg[1], loadavg[2]));
}
#endif
}
static unsigned int
get_page_size(void)
{
static unsigned int cached;
if (!cached) {
long int value = sysconf(_SC_PAGESIZE);
if (value >= 0) {
cached = value;
}
}
return cached;
}
static void
get_memory_stats(struct shash *stats)
{
if (!LINUX) {
unsigned int pagesize = get_page_size();
long int phys_pages = sysconf(_SC_PHYS_PAGES);
#ifdef _SC_AVPHYS_PAGES
long int avphys_pages = sysconf(_SC_AVPHYS_PAGES);
#else
long int avphys_pages = 0;
#endif
int mem_total, mem_used;
if (pagesize <= 0 || phys_pages <= 0 || avphys_pages <= 0) {
return;
}
mem_total = phys_pages * (pagesize / 1024);
mem_used = (phys_pages - avphys_pages) * (pagesize / 1024);
shash_add(stats, "memory", xasprintf("%d,%d", mem_total, mem_used));
} else {
static const char file_name[] = "/proc/meminfo";
int mem_used, mem_cache, swap_used;
int mem_free = 0;
int buffers = 0;
int cached = 0;
int swap_free = 0;
int mem_total = 0;
int swap_total = 0;
struct shash dict;
char line[128];
FILE *stream;
stream = fopen(file_name, "r");
if (!stream) {
VLOG_WARN_ONCE("%s: open failed (%s)", file_name, strerror(errno));
return;
}
shash_init(&dict);
shash_add(&dict, "MemTotal", &mem_total);
shash_add(&dict, "MemFree", &mem_free);
shash_add(&dict, "Buffers", &buffers);
shash_add(&dict, "Cached", &cached);
shash_add(&dict, "SwapTotal", &swap_total);
shash_add(&dict, "SwapFree", &swap_free);
while (fgets(line, sizeof line, stream)) {
char key[16];
int value;
if (sscanf(line, "%15[^:]: %u", key, &value) == 2) {
int *valuep = shash_find_data(&dict, key);
if (valuep) {
*valuep = value;
}
}
}
fclose(stream);
shash_destroy(&dict);
mem_used = mem_total - mem_free;
mem_cache = buffers + cached;
swap_used = swap_total - swap_free;
shash_add(stats, "memory",
xasprintf("%d,%d,%d,%d,%d", mem_total, mem_used, mem_cache,
swap_total, swap_used));
}
}
/* Returns the time at which the system booted, as the number of milliseconds
* since the epoch, or 0 if the time of boot cannot be determined. */
static long long int
get_boot_time(void)
{
static long long int cache_expiration = LLONG_MIN;
static long long int boot_time;
assert(LINUX);
if (time_msec() >= cache_expiration) {
static const char stat_file[] = "/proc/stat";
char line[128];
FILE *stream;
cache_expiration = time_msec() + 5 * 1000;
stream = fopen(stat_file, "r");
if (!stream) {
VLOG_ERR_ONCE("%s: open failed (%s)", stat_file, strerror(errno));
return boot_time;
}
while (fgets(line, sizeof line, stream)) {
long long int btime;
if (sscanf(line, "btime %lld", &btime) == 1) {
boot_time = btime * 1000;
goto done;
}
}
VLOG_ERR_ONCE("%s: btime not found", stat_file);
done:
fclose(stream);
}
return boot_time;
}
static unsigned long long int
ticks_to_ms(unsigned long long int ticks)
{
assert(LINUX);
#ifndef USER_HZ
#define USER_HZ 100
#endif
#if USER_HZ == 100 /* Common case. */
return ticks * (1000 / USER_HZ);
#else /* Alpha and some other architectures. */
double factor = 1000.0 / USER_HZ;
return ticks * factor + 0.5;
#endif
}
struct raw_process_info {
unsigned long int vsz; /* Virtual size, in kB. */
unsigned long int rss; /* Resident set size, in kB. */
long long int uptime; /* ms since started. */
long long int cputime; /* ms of CPU used during 'uptime'. */
pid_t ppid; /* Parent. */
char name[18]; /* Name (surrounded by parentheses). */
};
static bool
get_raw_process_info(pid_t pid, struct raw_process_info *raw)
{
unsigned long long int vsize, rss, start_time, utime, stime;
long long int start_msec;
unsigned long ppid;
char file_name[128];
FILE *stream;
int n;
assert(LINUX);
sprintf(file_name, "/proc/%lu/stat", (unsigned long int) pid);
stream = fopen(file_name, "r");
if (!stream) {
VLOG_ERR_ONCE("%s: open failed (%s)", file_name, strerror(errno));
return false;
}
n = fscanf(stream,
"%*d " /* (1. pid) */
"%17s " /* 2. process name */
"%*c " /* (3. state) */
"%lu " /* 4. ppid */
"%*d " /* (5. pgid) */
"%*d " /* (6. sid) */
"%*d " /* (7. tty_nr) */
"%*d " /* (8. tty_pgrp) */
"%*u " /* (9. flags) */
"%*u " /* (10. min_flt) */
"%*u " /* (11. cmin_flt) */
"%*u " /* (12. maj_flt) */
"%*u " /* (13. cmaj_flt) */
"%llu " /* 14. utime */
"%llu " /* 15. stime */
"%*d " /* (16. cutime) */
"%*d " /* (17. cstime) */
"%*d " /* (18. priority) */
"%*d " /* (19. nice) */
"%*d " /* (20. num_threads) */
"%*d " /* (21. always 0) */
"%llu " /* 22. start_time */
"%llu " /* 23. vsize */
"%llu " /* 24. rss */
#if 0
/* These are here for documentation but #if'd out to save
* actually parsing them from the stream for no benefit. */
"%*lu " /* (25. rsslim) */
"%*lu " /* (26. start_code) */
"%*lu " /* (27. end_code) */
"%*lu " /* (28. start_stack) */
"%*lu " /* (29. esp) */
"%*lu " /* (30. eip) */
"%*lu " /* (31. pending signals) */
"%*lu " /* (32. blocked signals) */
"%*lu " /* (33. ignored signals) */
"%*lu " /* (34. caught signals) */
"%*lu " /* (35. whcan) */
"%*lu " /* (36. always 0) */
"%*lu " /* (37. always 0) */
"%*d " /* (38. exit_signal) */
"%*d " /* (39. task_cpu) */
"%*u " /* (40. rt_priority) */
"%*u " /* (41. policy) */
"%*llu " /* (42. blkio_ticks) */
"%*lu " /* (43. gtime) */
"%*ld" /* (44. cgtime) */
#endif
, raw->name, &ppid, &utime, &stime, &start_time, &vsize, &rss);
fclose(stream);
if (n != 7) {
VLOG_ERR_ONCE("%s: fscanf failed", file_name);
return false;
}
start_msec = get_boot_time() + ticks_to_ms(start_time);
raw->vsz = vsize / 1024;
raw->rss = rss * (getpagesize() / 1024);
raw->uptime = time_wall_msec() - start_msec;
raw->cputime = ticks_to_ms(utime + stime);
raw->ppid = ppid;
return true;
}
static int
count_crashes(pid_t pid)
{
char file_name[128];
const char *paren;
char line[128];
int crashes = 0;
FILE *stream;
assert(LINUX);
sprintf(file_name, "/proc/%lu/cmdline", (unsigned long int) pid);
stream = fopen(file_name, "r");
if (!stream) {
VLOG_WARN_ONCE("%s: open failed (%s)", file_name, strerror(errno));
goto exit;
}
if (!fgets(line, sizeof line, stream)) {
VLOG_WARN_ONCE("%s: read failed (%s)", file_name,
feof(stream) ? "end of file" : strerror(errno));
goto exit_close;
}
paren = strchr(line, '(');
if (paren) {
int x;
if (sscanf(paren + 1, "%d", &x) == 1) {
crashes = x;
}
}
exit_close:
fclose(stream);
exit:
return crashes;
}
struct process_info {
unsigned long int vsz; /* Virtual size, in kB. */
unsigned long int rss; /* Resident set size, in kB. */
long long int booted; /* ms since monitor started. */
int crashes; /* # of crashes (usually 0). */
long long int uptime; /* ms since last (re)started by monitor. */
long long int cputime; /* ms of CPU used during 'uptime'. */
};
static bool
get_process_info(pid_t pid, struct process_info *pinfo)
{
struct raw_process_info child;
assert(LINUX);
if (!get_raw_process_info(pid, &child)) {
return false;
}
pinfo->vsz = child.vsz;
pinfo->rss = child.rss;
pinfo->booted = child.uptime;
pinfo->crashes = 0;
pinfo->uptime = child.uptime;
pinfo->cputime = child.cputime;
if (child.ppid) {
struct raw_process_info parent;
get_raw_process_info(child.ppid, &parent);
if (!strcmp(child.name, parent.name)) {
pinfo->booted = parent.uptime;
pinfo->crashes = count_crashes(child.ppid);
}
}
return true;
}
static void
get_process_stats(struct shash *stats)
{
struct dirent *de;
DIR *dir;
dir = opendir(ovs_rundir());
if (!dir) {
VLOG_ERR_ONCE("%s: open failed (%s)", ovs_rundir(), strerror(errno));
return;
}
while ((de = readdir(dir)) != NULL) {
struct process_info pinfo;
char *key, *value;
char *file_name;
char *extension;
pid_t pid;
#ifdef _DIRENT_HAVE_D_TYPE
if (de->d_type != DT_UNKNOWN && de->d_type != DT_REG) {
continue;
}
#endif
extension = strrchr(de->d_name, '.');
if (!extension || strcmp(extension, ".pid")) {
continue;
}
file_name = xasprintf("%s/%s", ovs_rundir(), de->d_name);
pid = read_pidfile(file_name);
free(file_name);
if (pid < 0) {
continue;
}
key = xasprintf("process_%.*s",
(int) (extension - de->d_name), de->d_name);
if (shash_find(stats, key)) {
free(key);
continue;
}
if (LINUX && get_process_info(pid, &pinfo)) {
value = xasprintf("%lu,%lu,%lld,%d,%lld,%lld",
pinfo.vsz, pinfo.rss, pinfo.cputime,
pinfo.crashes, pinfo.booted, pinfo.uptime);
} else {
value = xstrdup("");
}
shash_add_nocopy(stats, key, value);
}
closedir(dir);
}
static void
get_filesys_stats(struct shash *stats OVS_UNUSED)
{
#if HAVE_SETMNTENT && HAVE_STATVFS
static const char file_name[] = "/etc/mtab";
struct mntent *me;
FILE *stream;
struct ds s;
stream = setmntent(file_name, "r");
if (!stream) {
VLOG_ERR_ONCE("%s: open failed (%s)", file_name, strerror(errno));
return;
}
ds_init(&s);
while ((me = getmntent(stream)) != NULL) {
unsigned long long int total, free;
struct statvfs vfs;
char *p;
/* Skip non-local and read-only filesystems. */
if (strncmp(me->mnt_fsname, "/dev", 4)
|| !strstr(me->mnt_opts, "rw")) {
continue;
}
/* Given the mount point we can stat the file system. */
if (statvfs(me->mnt_dir, &vfs) && vfs.f_flag & ST_RDONLY) {
/* That's odd... */
continue;
}
/* Now format the data. */
if (s.length) {
ds_put_char(&s, ' ');
}
for (p = me->mnt_dir; *p != '\0'; p++) {
ds_put_char(&s, *p == ' ' || *p == ',' ? '_' : *p);
}
total = (unsigned long long int) vfs.f_frsize * vfs.f_blocks / 1024;
free = (unsigned long long int) vfs.f_frsize * vfs.f_bfree / 1024;
ds_put_format(&s, ",%llu,%llu", total, total - free);
}
endmntent(stream);
if (s.length) {
shash_add(stats, "file_systems", ds_steal_cstr(&s));
}
ds_destroy(&s);
#endif /* HAVE_SETMNTENT && HAVE_STATVFS */
}
void
get_system_stats(struct shash *stats)
{
get_cpu_cores(stats);
get_load_average(stats);
get_memory_stats(stats);
get_process_stats(stats);
get_filesys_stats(stats);
}
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