Re: perf: bisected sampling bug in Linux 4.11-rc1

[Vince Weaver]

On Sat, 15 Jul 2017, Ingo Molnar wrote:

> 
> * Vince Weaver <vincent.weaver@xxxxxxxxx> wrote:
> 
> > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit
> > 
> > commit 487f05e18aa4efacee6357480f293a5afe6593b5
> > Author: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
> > Date:   Thu Jan 19 18:43:30 2017 +0200
> > 
> >     perf/core: Optimize event rescheduling on active contexts
> 
> BTW., just to prepare for the eventuality: below is a (completely untested...) 
> revert of this commit, against recent kernels, with conflicts fixed up.
> 
> Does this fix your testcase?

Yes, applying this to current git fixes the testcase and doesn't seem to 
break anything else.


Although there is a separate issue also introduced in 4.11-rc1 that still 
fails a different testcase.  I'm in the middle of bisecting that one and 
probably won't have the result of the bisect until Monday.

Vince