Hi!
> -void *thread_fn(void *val)
> +static int load_cpu(int max_freq_khz)
> {
> - 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);
> + int sum = 0, i = 0, total_time_ms;
> + struct timespec tv_start, tv_end;
>
> - do {
> - for (i = 1; i < 10000; ++i)
> - res += i * i;
> - gettimeofday(&tv_end, NULL);
> - sched_yield();
> - } while ((tv_end.tv_sec - tv_start.tv_sec) < timeout);
> -
> - tst_resm(TINFO, "CPU0 load done: insignificant value '%d'", res);
> + const int max_sum = max_freq_khz / 1000;
> + const int units = 1000000; /* Mhz */
>
> - return NULL;
> -}
> + clock_gettime(CLOCK_MONOTONIC_RAW, &tv_start);
>
> -static int load_cpu(intptr_t timeout)
> -{
> - pthread_t thread_id;
> + do {
> + for (i = 0; i < units; ++i)
> + asm ("" : : : "memory");
> + } while (++sum < max_sum);
>
> - if (pthread_create(&thread_id, 0, thread_fn,
> - (void *) timeout) != 0) {
> - tst_brkm(TBROK | TERRNO, cleanup,
> - "pthread_create failed at %s:%d",
> - __FILE__, __LINE__);
> - }
> + clock_gettime(CLOCK_MONOTONIC_RAW, &tv_end);
>
> - sleep(2 * timeout / 3);
> + total_time_ms = (tv_end.tv_sec - tv_start.tv_sec) * 1000 +
> + (tv_end.tv_nsec - tv_start.tv_nsec) / 1000000;
>
> - int cur_freq;
> - SAFE_FILE_SCANF(cleanup, curspeed, "%d", &cur_freq);
> - tst_resm(TINFO, "got cpu freq under load: %d", cur_freq);
> + if (!total_time_ms)
> + tst_brkm(TBROK, cleanup, "can't calc freq, time period is 0");
>
> - pthread_join(thread_id, NULL);
> + tst_resm(TINFO, "elapsed time is %d ms", total_time_ms);
>
> - return cur_freq;
> + return sum * 1000 / total_time_ms;
Is this conversion really necessary? I guess that we can also return
the elapsed time here and test that the time is shorted by a few
percents with boost enabled in the test_run() function.
Otherwise it looks good.
--
Cyril Hrubis
chru...@suse.cz
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