Re: [PATCH] process cputimer is moving faster than its corresponding clock

Olivier Langlois
2013-04-27T01:51:20Z

On Fri, 2013-04-26 at 15:08 -0400, KOSAKI Motohiro wrote:
> > I need to add that I can only confirm that to be true with
> > sum_exec_runtime.
> >
> > To affirm it to be true for stime and utime would require more
> > investigation. I didn't look them at all. I was only concerned with
> > sum_exec_runtime.
> >
> > I will prepare a v2 of the patch accounting all the feedbacks that I
> > received from KOSAKI Motohiro, Frederic Weisbecker and Peter Zijlstra
> > and send it back here for further discussion.
> >
> > Thank you very much all!
>
> Do you mean your utime test case still failure? If you share your test-case,
> I'm going to look at your issue too.
>
Sure with pleasure. My testcase is glibc-2.17/rt/tst-cputimer1.c

That being said, it strictly test CPUCLOCK_SCHED timers. Hence my focus
when modifying the code was strictly on sum_exec_runtime.

If utime and stime components of cputimer are moving faster than their
associated clock, this is something that I did not address.