Re: [PATCH] sched/cputime: fix clock_nanosleep/clock_gettime inconsistency

[Stanislaw Gruszka]

On Wed, Nov 12, 2014 at 12:45:38PM +0100, Peter Zijlstra wrote:
> On Wed, Nov 12, 2014 at 12:37:37PM +0100, Peter Zijlstra wrote:
> 
> > Which would make the sample run ahead, making the sleep short. So would
> > something like the below not cure things?
> 
> Before anyone asks, yes I tried running that 'reproducer' it doesn't.

I'd be surprised if the patch would help. Issue here happen at start of
cputimer. We set sum_sched_runtime value of cputimer using not yet
accounted threads runtime and then add that runtime values again to
running cputimer on tick, making it's sum_exec_runtime bigger than
actual threads runtime.

Stanislaw
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