On Wed, Nov 12, 2014 at 01:27:53PM +0100, Stanislaw Gruszka wrote: > 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.
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