src/plugin_idlejitter.c

   1 #include <pthread.h>
   2 #include <sys/time.h>
   3 #include <sys/resource.h>
   4 #include <strings.h>
   5 #include <unistd.h>
   6
   7 #include "global_statistics.h"
   8 #include "common.h"
   9 #include "config.h"
  10 #include "log.h"
  11 #include "rrd.h"
  12 #include "plugin_idlejitter.h"
  13
  14 #define CPU_IDLEJITTER_SLEEP_TIME_MS 20
  15
  16 void *cpuidlejitter_main(void *ptr)
  17 {
  18         if(ptr) { ; }
  19
  20         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  21                 error("Cannot set pthread cancel type to DEFERRED.");
  22
  23         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  24                 error("Cannot set pthread cancel state to ENABLE.");
  25
  26         int sleep_ms = config_get_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS);
  27         if(sleep_ms <= 0) {
  28                 config_set_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS);
  29                 sleep_ms = CPU_IDLEJITTER_SLEEP_TIME_MS;
  30         }
  31
  32         RRDSET *st = rrdset_find("system.idlejitter");
  33         if(!st) {
  34                 st = rrdset_create("system", "idlejitter", NULL, "cpu", "CPU Idle Jitter", "microseconds lost/s", 9999, rrd_update_every, RRDSET_TYPE_LINE);
  35                 rrddim_add(st, "jitter", NULL, 1, 1, RRDDIM_ABSOLUTE);
  36         }
  37
  38         struct timeval before, after;
  39         unsigned long long counter;
  40         for(counter = 0; 1 ;counter++) {
  41                 unsigned long long usec = 0, susec = 0;
  42
  43                 while(susec < (rrd_update_every * 1000000ULL)) {
  44
  45                         gettimeofday(&before, NULL);
  46                         usleep(sleep_ms * 1000);
  47                         gettimeofday(&after, NULL);
  48
  49                         // calculate the time it took for a full loop
  50                         usec = usecdiff(&after, &before);
  51                         susec += usec;
  52                 }
  53                 usec -= (sleep_ms * 1000);
  54
  55                 if(counter) rrdset_next_usec(st, susec);
  56                 rrddim_set(st, "jitter", usec);
  57                 rrdset_done(st);
  58         }
  59
  60         return NULL;
  61 }
  62