Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751236AbdGOOhw (ORCPT ); Sat, 15 Jul 2017 10:37:52 -0400 Received: from mail-io0-f193.google.com ([209.85.223.193]:33053 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751194AbdGOOhv (ORCPT ); Sat, 15 Jul 2017 10:37:51 -0400 From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Sat, 15 Jul 2017 10:37:43 -0400 (EDT) X-X-Sender: vince@macbook-air To: Ingo Molnar cc: Vince Weaver , linux-kernel@vger.kernel.org, Alexander Shishkin , Peter Zijlstra , Stephane Eranian , Jiri Olsa , Arnaldo Carvalho de Melo , Thomas Gleixner Subject: Re: perf: bisected sampling bug in Linux 4.11-rc1 In-Reply-To: <20170715110049.36jvxnidy2flh6ll@gmail.com> Message-ID: References: <20170715110049.36jvxnidy2flh6ll@gmail.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 912 Lines: 27 On Sat, 15 Jul 2017, Ingo Molnar wrote: > > * Vince Weaver wrote: > > > 487f05e18aa4efacee6357480f293a5afe6593b5 is the first bad commit > > > > commit 487f05e18aa4efacee6357480f293a5afe6593b5 > > Author: Alexander Shishkin > > 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