18 Mar
2016
18 Mar
'16
9:53 a.m.
On Fri, Mar 18, 2016 at 09:44:40AM +0000, Chris Wilson wrote:
On Thu, Mar 17, 2016 at 06:18:06PM -0300, Tiago Vignatti wrote:
+static void test_ioctl_errors(void) +{
- int i;
- int num_children = 8*sysconf(_SC_NPROCESSORS_ONLN);
- igt_fork_signal_helper();
- igt_fork(child, num_children) {
Actually there is a danger here in only using a fork-bomb, we may loose out on signal interruptions due to busyspins on the mutex (i.e. the contention hiding critical paths, since we crucially rely on timing).
For fun, I would use:
int ncpus = sysconf(_SC_NPROCESSORS_ONLN); int num_children;
igt_fork_signal_helper(); for (int num_children = 1; num_children <= 8 *ncpus; num_children <<= 1) { igt_fork(child, num_children) { struct timespec start = {}; while (igt_seconds_elapsed(&start) <= num_children) blit_and_cmp(); } } igt_waitchildren();
With the bug ofc! -Chris
--
Chris Wilson, Intel Open Source Technology Centre