Mercurial > archived > louis > perso > liblxcstats

annotate probes/cpuacct.c @ 6:e2b88f50e136

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cpuacct: replace strtoll by strtoul and replace sscanf by strsplit + strtoul
author Louis Opter <louis@dotcloud.com>
date Sat, 01 Jan 2011 16:18:17 +0100
parents 2cb8a6cbe468
children 6f2e13f5fcfd
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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 <string.h>
3
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8 #include <unistd.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
3
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13 static inline uint32_t
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14 nsecs_to_user_hz(uint64_t counter)
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15 {
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16 /*
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17 * XXX I don't know if it will work for custom values of HZ in the kernel.
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18 */
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19 return (counter / (NSEC_PER_SEC / sysconf(_SC_CLK_TCK)));
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20 }
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21
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22 static int
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23 read_stat(struct lxcst *c)
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24 {
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25 char path[PATH_MAX];
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26 char *values;
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27 char *fields[4];
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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 if (_lxcst_strsplit(values, fields, ARRAY_SIZE(fields)) == ARRAY_SIZE(fields)) {
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35 errno = 0;
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36 c->cpuacct.user = strtoul(fields[1], NULL, 10);
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37 c->cpuacct.system = strtoul(fields[3], NULL, 10);
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38 if (!errno) {
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39 free(values);
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40 return (0);
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41 }
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42 }
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43 free(values);
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44 }
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45
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46 c->cpuacct.user = 0;
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47 c->cpuacct.system = 0;
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48 return (1);
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49 }
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50
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51 static int
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52 read_usage_percpu(struct lxcst *c)
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53 {
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54 char path[PATH_MAX];
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55 char *values;
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56 int ret;
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57 char *p;
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58 int ncpus;
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59 int i;
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60
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61 _lxcst_join_path(path, sizeof(path), c->cgroup_dir, "cpuacct.usage_percpu");
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62 ret = _lxcst_read_file(path, &values);
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63 if (ret > 0) {
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64 values[ret - 1] = '\0';
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65
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66 p = values;
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67 for (ncpus = 0; ; ncpus++) {
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68 p = strchr(p + 1, ' ');
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69 if (!p)
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70 break ;
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71 }
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72
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73 if (ncpus)
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74 c->cpuacct.percpu = calloc(ncpus + 1, sizeof(*c->cpuacct.percpu));
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75
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76 if (c->cpuacct.percpu) {
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77 errno = 0;
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78 p = values;
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79 for (i = 0; i != ncpus && *p; ++i) {
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80 c->cpuacct.percpu[i] = nsecs_to_user_hz(strtoul(p, &p, 10));
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81 if (errno)
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82 goto err;
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83 p += strcspn(p, "0123456789");
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84 }
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85
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86 free(values);
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87 return (0);
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88 }
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89
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90 err:
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91 free(c->cpuacct.percpu);
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92 c->cpuacct.percpu = NULL;
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93 free(values);
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94 }
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95
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96 return (1);
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97 }
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98
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99 int
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100 _lxcst_probe_cpuacct(struct lxcst *c)
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101 {
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102 assert(c);
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103
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104 return (read_stat(c)
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105 || read_usage_percpu(c));
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106 }