From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754309AbcFGLU7 (ORCPT ); Tue, 7 Jun 2016 07:20:59 -0400 Received: from mx2.suse.de ([195.135.220.15]:46135 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751669AbcFGLU6 (ORCPT ); Tue, 7 Jun 2016 07:20:58 -0400 Date: Tue, 7 Jun 2016 12:20:54 +0100 From: Mel Gorman To: Mike Galbraith Cc: lkml , Thomas Gleixner , Sebastian Andrzej Siewior , dbueso@suse.de Subject: Re: [patch] futex: Fix v4.6+ ltp futex_wait04 regression Message-ID: <20160607112054.GI2469@suse.de> References: <1465206041.6397.14.camel@gmail.com> <20160607105056.GH2469@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20160607105056.GH2469@suse.de> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 07, 2016 at 11:50:56AM +0100, Mel Gorman wrote: > On Mon, Jun 06, 2016 at 11:40:41AM +0200, Mike Galbraith wrote: > > Hi Mel (who is out of the office today), > > > > Adding Davidlohr who did a lot of the work debugging my initial > prototype. > > > I initially reported this on the rt-users list, thinking at the time > > that it was only showing up in -rt kernels, but that turned out to not > > be the case, it just requires an enterprise config for some reason mm > > folks will likely recognize instantly. I just happen to use same when > > building devel -rt trees to at least get some build warning coverage. > > > > Can you post the exact config? I used an enterprise config and was unable > to reproduce the problem on 4.6. I'll be trying 4.7-rc1 after finishing > this mail even though the optimisation was introduced before 4.6. > Never mind, I reproduced the problem and reckon I know where the problem is. I'll keep poking at it. -- Mel Gorman SUSE Labs