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

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Message-ID: <alpine.DEB.2.20.1707151033130.29924@macbook-air>
Date:   Sat, 15 Jul 2017 10:37:43 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...il.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: perf: bisected sampling bug in Linux 4.11-rc1

On Sat, 15 Jul 2017, Ingo Molnar wrote:

> 
> * Vince Weaver <vincent.weaver@...ne.edu> wrote:
> 
> > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit
> > 
> > commit 487f05e18aa4efacee6357480f293a5afe6593b5
> > Author: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > 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