MEAN_SAMPLE_INTERVAL  156 tools/testing/selftests/timers/freq-step.c 		usleep(1e6 * MEAN_SAMPLE_INTERVAL / 10);
MEAN_SAMPLE_INTERVAL  168 tools/testing/selftests/timers/freq-step.c 		usleep(rand() % 2000000 * MEAN_SAMPLE_INTERVAL);