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annotate probes/cpuacct.c @ 0:6ce4443e7545

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Add the draft of an API to collect statistics on LXC
author Louis Opter <kalessin@kalessin.fr>
date Wed, 29 Dec 2010 23:28:14 +0100
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children 2cb8a6cbe468
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6ce4443e7545 Add the draft of an API to collect statistics on LXC
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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
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10 #include "lxcstats.h"
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11 #include "_lxcstats.h"
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12
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13 static int
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14 read_stat(struct lxcst *c)
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15 {
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16 char path[PATH_MAX];
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17 char *values;
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18 int ret;
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19
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20 _lxcst_join_path(path, sizeof(path), c->cgroup_dir, "cpuacct.stat");
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21 ret = _lxcst_read_file(path, &values);
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22 if (ret > 0) {
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23 values[ret - 1] = '\0'; /* Replace the last \n by a \0 */
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24 ret = sscanf(values, "user %u\nsystem %u", &c->cpuacct.user, &c->cpuacct.system);
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25 free(values);
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26 if (ret == 2)
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27 return (0);
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28 }
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29
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30 c->cpuacct.user = 0;
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31 c->cpuacct.system = 0;
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32 return (1);
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33 }
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34
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35 static int
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36 read_usage_percpu(struct lxcst *c)
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37 {
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38 char path[PATH_MAX];
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39 char *values;
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40 int ret;
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41 char *p;
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42 int ncpus;
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43 int i;
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44
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45 _lxcst_join_path(path, sizeof(path), c->cgroup_dir, "cpuacct.usage_percpu");
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46 ret = _lxcst_read_file(path, &values);
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47 if (ret > 0) {
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48 values[ret - 1] = '\0';
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49
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50 p = values;
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51 for (ncpus = 0; ; ncpus++) {
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52 p = strchr(p + 1, ' ');
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53 if (!p)
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54 break ;
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55 }
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56
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57 if (ncpus)
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58 c->cpuacct.percpu = calloc(ncpus + 1, sizeof(*c->cpuacct.percpu));
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59
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60 if (c->cpuacct.percpu) {
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61 errno = 0;
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62 p = values;
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63 for (i = 0; i != ncpus && *p; ++i) {
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64 c->cpuacct.percpu[i] = strtoll(p, &p, 10);
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65 if (errno)
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66 goto err;
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67 p += strcspn(p, "0123456789");
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68 }
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69
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70 free(values);
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71 return (0);
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72 }
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73
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74 err:
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75 free(c->cpuacct.percpu);
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76 c->cpuacct.percpu = NULL;
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77 free(values);
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78 }
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79
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80 return (1);
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81 }
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82
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83 int
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84 _lxcst_probe_cpuacct(struct lxcst *c)
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85 {
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86 assert(c);
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87
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88 return (read_stat(c)
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89 || read_usage_percpu(c));
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90 }