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// SPDX-License-Identifier: GPL-3.0-or-later
#include "daemon/common.h"
#define CPU_IDLEJITTER_SLEEP_TIME_MS 20
static void cpuidlejitter_main_cleanup(void *pptr) {
struct netdata_static_thread *static_thread = CLEANUP_FUNCTION_GET_PTR(pptr);
if(!static_thread) return;
static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
collector_info("cleaning up...");
worker_unregister();
static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
}
void *cpuidlejitter_main(void *ptr) {
CLEANUP_FUNCTION_REGISTER(cpuidlejitter_main_cleanup) cleanup_ptr = ptr;
worker_register("IDLEJITTER");
worker_register_job_name(0, "measurements");
usec_t sleep_ut = config_get_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS) * USEC_PER_MS;
if(sleep_ut <= 0) {
config_set_number("plugin:idlejitter", "loop time in ms", CPU_IDLEJITTER_SLEEP_TIME_MS);
sleep_ut = CPU_IDLEJITTER_SLEEP_TIME_MS * USEC_PER_MS;
}
RRDSET *st = rrdset_create_localhost(
"system"
, "idlejitter"
, NULL
, "idlejitter"
, NULL
, "CPU Idle Jitter"
, "microseconds lost/s"
, "idlejitter.plugin"
, NULL
, NETDATA_CHART_PRIO_SYSTEM_IDLEJITTER
, localhost->rrd_update_every
, RRDSET_TYPE_AREA
);
RRDDIM *rd_min = rrddim_add(st, "min", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
RRDDIM *rd_max = rrddim_add(st, "max", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
RRDDIM *rd_avg = rrddim_add(st, "average", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
usec_t update_every_ut = localhost->rrd_update_every * USEC_PER_SEC;
struct timeval before, after;
while (service_running(SERVICE_COLLECTORS)) {
int iterations = 0;
usec_t error_total = 0,
error_min = 0,
error_max = 0,
elapsed = 0;
while (elapsed < update_every_ut) {
now_monotonic_high_precision_timeval(&before);
worker_is_idle();
sleep_usec(sleep_ut);
worker_is_busy(0);
now_monotonic_high_precision_timeval(&after);
usec_t dt = dt_usec(&after, &before);
elapsed += dt;
usec_t error = dt - sleep_ut;
error_total += error;
if(unlikely(!iterations || error < error_min))
error_min = error;
if(error > error_max)
error_max = error;
iterations++;
}
if(iterations) {
rrddim_set_by_pointer(st, rd_min, error_min);
rrddim_set_by_pointer(st, rd_max, error_max);
rrddim_set_by_pointer(st, rd_avg, error_total / iterations);
rrdset_done(st);
}
}
return NULL;
}
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