src/plugin_idlejitter.c

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