From: Vince Weaver <vincent.weaver@maine.edu>
To: Ingo Molnar <mingo@kernel.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>,
linux-kernel@vger.kernel.org,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@gmail.com>,
Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: perf: bisected sampling bug in Linux 4.11-rc1
Date: Sat, 15 Jul 2017 10:37:43 -0400 (EDT) [thread overview]
Message-ID: <alpine.DEB.2.20.1707151033130.29924@macbook-air> (raw)
In-Reply-To: <20170715110049.36jvxnidy2flh6ll@gmail.com>
On Sat, 15 Jul 2017, Ingo Molnar wrote:
>
> * Vince Weaver <vincent.weaver@maine.edu> wrote:
>
> > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit
> >
> > commit 487f05e18aa4efacee6357480f293a5afe6593b5
> > Author: Alexander Shishkin <alexander.shishkin@linux.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
next prev parent reply other threads:[~2017-07-15 14:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 18:05 Vince Weaver
2017-07-14 18:25 ` Vince Weaver
2017-07-14 20:07 ` Alexander Shishkin
2017-07-14 20:14 ` Vince Weaver
2017-07-15 11:00 ` Ingo Molnar
2017-07-15 14:37 ` Vince Weaver [this message]
2017-07-16 3:03 ` Vince Weaver
2017-07-18 10:39 ` [tip:perf/urgent] Revert "perf/core: Optimize event rescheduling on active contexts" tip-bot for Ingo Molnar
2017-07-18 11:08 ` perf: bisected sampling bug in Linux 4.11-rc1 Alexander Shishkin
2017-07-18 12:13 ` Ingo Molnar
2017-07-20 3:30 ` Vince Weaver
2017-07-20 8:34 ` [tip:perf/urgent] perf/core: Fix scheduling regression of pinned groups tip-bot for Alexander Shishkin
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