[LTP] [PATCH] [RFC] syscalls/perf_event_open02: Fix failures

Cyril Hrubis chrubis@suse.cz
Fri May 11 13:48:40 CEST 2018

> > The testcase was failing randomly, it could be reproduced easily when
> > the machine is under load. To reproduce the issue just run a few
> > dd if=/dev/zero of=/dev/null to saturate your CPUs.
> > 
> > It has been sugessted that the reason for the failure are rounding
> > errors caused by a frequent preemption. I haven't got a definitive
> > answer from kernel devs for this but it's true that changing the process
> > pritority to realtime SCHED_FIFO for the measurement does fix the issue.
> > 
> > So we either delete the test or apply this patch.
> Any comments for this patch?
> I would like to have this sorted out before the release...

Since nobody commented I will apply this next week, if you are againts
this patch, or want to ack it, speak up now :-).

Cyril Hrubis

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