src/plugin_idlejitter.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <pthread.h>
   5 #include <sys/time.h>
   6 #include <sys/resource.h>
   7 #include <strings.h>
   8 #include <unistd.h>
   9
  10 #include "global_statistics.h"
  11 #include "common.h"
  12 #include "appconfig.h"
  13 #include "log.h"
  14 #include "rrd.h"
  15 #include "plugin_idlejitter.h"
  16
  17 #define CPU_IDLEJITTER_SLEEP_TIME_MS 20
  18
  19 void *cpuidlejitter_main(void *ptr)
  20 {
  21         if(ptr) { ; }
  22
  23         info("CPU Idle Jitter thread created with task id %d", gettid());
  24
  25         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
  26                 error("Cannot set pthread cancel type to DEFERRED.");
  27
  28         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
  29                 error("Cannot set pthread cancel state to ENABLE.");
  30
  31         int sleep_ms = config_get_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS);
  32         if(sleep_ms <= 0) {
  33                 config_set_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS);
  34                 sleep_ms = CPU_IDLEJITTER_SLEEP_TIME_MS;
  35         }
  36
  37         RRDSET *st = rrdset_find("system.idlejitter");
  38         if(!st) {
  39                 st = rrdset_create("system", "idlejitter", NULL, "cpu", "CPU Idle Jitter", "microseconds lost/s", 9999, rrd_update_every, RRDSET_TYPE_LINE);
  40                 rrddim_add(st, "jitter", NULL, 1, 1, RRDDIM_ABSOLUTE);
  41         }
  42
  43         struct timeval before, after;
  44         unsigned long long counter;
  45         for(counter = 0; 1 ;counter++) {
  46                 unsigned long long usec = 0, susec = 0;
  47
  48                 while(susec < (rrd_update_every * 1000000ULL)) {
  49
  50                         gettimeofday(&before, NULL);
  51                         usleep(sleep_ms * 1000);
  52                         gettimeofday(&after, NULL);
  53
  54                         // calculate the time it took for a full loop
  55                         usec = usecdiff(&after, &before);
  56                         susec += usec;
  57                 }
  58                 usec -= (sleep_ms * 1000);
  59
  60                 if(counter) rrdset_next_usec(st, susec);
  61                 rrddim_set(st, "jitter", usec);
  62                 rrdset_done(st);
  63         }
  64
  65         return NULL;
  66 }
  67