Hi!
> +void *thread_fn(void *val)
> +{
> + struct timeval tv_start;
> + struct timeval tv_end;
> + int i, res = 0;
> + intptr_t timeout = (intptr_t) val;
> +
> + gettimeofday(&tv_start, NULL);
> + tst_resm(TINFO, "load CPU0 for %ld sec...", timeout);
> +
> + do {
> + for (i = 1; i < 1000; ++i)
> + res += i * i;
> + gettimeofday(&tv_end, NULL);
One more thing, you should probably add sched_yield() here to make sure
the load_cpu() is executed after the sleep() has finished.
> + } while ((tv_end.tv_sec - tv_start.tv_sec) < timeout);
> +
> + tst_resm(TINFO, "CPU0 load done: insignificant value '%d'", res);
> +
> + return NULL;
> +}
> +
> +static int load_cpu(intptr_t timeout)
> +{
> + pthread_t thread_id;
> +
> + if (pthread_create(&thread_id, 0, thread_fn,
> + (intptr_t *) timeout) != 0) {
> + tst_brkm(TBROK | TERRNO, cleanup,
> + "pthread_create failed at %s:%d",
> + __FILE__, __LINE__);
> + }
> +
> + sleep(2 * timeout / 3);
> +
> + int cur_freq;
> + SAFE_FILE_SCANF(cleanup, curspeed, "%d", &cur_freq);
> + tst_resm(TINFO, "got cpu freq under load: %d", cur_freq);
> +
> + pthread_join(thread_id, NULL);
> +
> + return cur_freq;
> +}
--
Cyril Hrubis
[email protected]
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