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

KOSAKI Motohiro
2013-04-27T02:16:05Z

On Fri, Apr 26, 2013 at 9:51 PM, Olivier Langlois
<olivier@trillion01.com> wrote:
> 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.

Hmm... Sorry. I'm confused. 1) I haven't seen any glibc test failure
after applying
my patch. 2) tst-cputimer1.c only have CLOCK_PROCESS_CPUTIME_ID test and
don't have any utime, stime tests.

Please let me know if you've seen any failure after applying my patch.