linux-kernel - Re: sched/cputime: sig->prev

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Message-ID: <51670549.70205@sr71.net>
Date:	Thu, 11 Apr 2013 11:47:37 -0700
From:	Dave Hansen <dave@...1.net>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: sched/cputime: sig->prev_stime underflow

On 04/11/2013 12:45 AM, Stanislaw Gruszka wrote:
> On Mon, Apr 08, 2013 at 08:57:16AM -0700, Dave Hansen wrote:
>> On 04/04/2013 04:41 PM, Frederic Weisbecker wrote:
>>> Does this patch fix the issue for you?
>>> https://lkml.org/lkml/2013/4/4/112
>>
>> Nope, that doesn't seem to make a difference.  I'm still seeing the
>> underflow.  I'm pretty sure it's already gone to hell by the time it
>> gets in to the loop that's patched there.
> 
> Perhaps this is glich introduced by commit 
> 62188451f0d63add7ad0cd2a1ae269d600c1663d "cputime: Avoid multiplication
> overflow on utime scaling" . Could you try to revert it and see if that
> helps. If it does not, can you check if problem happen on 3.8 ?

I'll run a bit longer, but reverting
62188451f0d63add7ad0cd2a1ae269d600c1663d _does_ seem to make it happier.

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