Mercurial > archived > louis > perso > liblxcstats

annotate probes/cpuacct.c @ 3:2cb8a6cbe468

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cpuacct: convert per cpu usage from nanoseconds to jiffies
author Louis Opter <louis@dotcloud.com>
date Fri, 31 Dec 2010 20:04:25 +0100
parents 6ce4443e7545
children e2b88f50e136
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1 #include <sys/types.h>
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2
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3 #include <assert.h>
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4 #include <errno.h>
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5 #include <limits.h>
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6 #include <stdlib.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <unistd.h>
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10
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11 #include "lxcstats.h"
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12 #include "_lxcstats.h"
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13
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14 static inline uint32_t
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15 nsecs_to_user_hz(uint64_t counter)
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16 {
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17 /*
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18 * XXX I don't know if it will work for custom values of HZ in the kernel.
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19 */
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20 return (counter / (NSEC_PER_SEC / sysconf(_SC_CLK_TCK)));
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21 }
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22
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23 static int
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24 read_stat(struct lxcst *c)
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25 {
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26 char path[PATH_MAX];
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27 char *values;
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28 int ret;
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29
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30 _lxcst_join_path(path, sizeof(path), c->cgroup_dir, "cpuacct.stat");
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31 ret = _lxcst_read_file(path, &values);
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32 if (ret > 0) {
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33 values[ret - 1] = '\0'; /* Replace the last \n by a \0 */
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34 ret = sscanf(values, "user %u\nsystem %u", &c->cpuacct.user, &c->cpuacct.system);
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35 free(values);
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36 if (ret == 2)
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37 return (0);
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38 }
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39
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40 c->cpuacct.user = 0;
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41 c->cpuacct.system = 0;
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42 return (1);
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43 }
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44
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45 static int
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46 read_usage_percpu(struct lxcst *c)
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47 {
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48 char path[PATH_MAX];
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49 char *values;
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50 int ret;
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51 char *p;
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52 int ncpus;
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53 int i;
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54
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55 _lxcst_join_path(path, sizeof(path), c->cgroup_dir, "cpuacct.usage_percpu");
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56 ret = _lxcst_read_file(path, &values);
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57 if (ret > 0) {
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58 values[ret - 1] = '\0';
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59
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60 p = values;
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61 for (ncpus = 0; ; ncpus++) {
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62 p = strchr(p + 1, ' ');
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63 if (!p)
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64 break ;
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65 }
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66
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67 if (ncpus)
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68 c->cpuacct.percpu = calloc(ncpus + 1, sizeof(*c->cpuacct.percpu));
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69
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70 if (c->cpuacct.percpu) {
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71 errno = 0;
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72 p = values;
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73 for (i = 0; i != ncpus && *p; ++i) {
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74 c->cpuacct.percpu[i] = nsecs_to_user_hz(strtoll(p, &p, 10));
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75 if (errno)
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76 goto err;
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77 p += strcspn(p, "0123456789");
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78 }
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79
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80 free(values);
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81 return (0);
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82 }
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83
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84 err:
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85 free(c->cpuacct.percpu);
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86 c->cpuacct.percpu = NULL;
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87 free(values);
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88 }
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89
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90 return (1);
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91 }
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92
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93 int
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94 _lxcst_probe_cpuacct(struct lxcst *c)
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95 {
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96 assert(c);
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97
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98 return (read_stat(c)
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99 || read_usage_percpu(c));
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100 }