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

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Date:	Fri, 26 Apr 2013 21:51:16 -0400
From:	Olivier Langlois <olivier@...llion01.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, schwidefsky@...ibm.com,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] process cputimer is moving faster than its
 corresponding clock

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.


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