Re: sched/cputime: sig->prev_stime underflow

From: Dave Hansen
Date: Thu Apr 11 2013 - 14:47:42 EST

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?
>> 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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