Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757095Ab3ILUtQ (ORCPT ); Thu, 12 Sep 2013 16:49:16 -0400 Received: from mail-ee0-f54.google.com ([74.125.83.54]:54736 "EHLO mail-ee0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753198Ab3ILUtO (ORCPT ); Thu, 12 Sep 2013 16:49:14 -0400 Date: Thu, 12 Sep 2013 22:49:10 +0200 From: Ingo Molnar To: Linus Torvalds Cc: Linux Kernel Mailing List , Arnaldo Carvalho de Melo , Peter Zijlstra , Thomas Gleixner , Andrew Morton Subject: Re: [GIT PULL] perf fixes Message-ID: <20130912204910.GB3262@gmail.com> References: <20130912133855.GA23780@gmail.com> <20130912203358.GE32644@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1304 Lines: 35 * Linus Torvalds wrote: > On Thu, Sep 12, 2013 at 1:33 PM, Ingo Molnar wrote: > > > > Hm, just to make sure, are you running a (very fresh) kernel that has this > > fix included: > > > > d008d5258e9c perf: Fix up MMAP2 buffer space reservation > > I've rebooted about five times since that report, so I'm not sure.. > > [ Short time passes ] > > Hmm. That "reproducible" error is no longer reproducible for me on > current git (68f0d9d92e54). So if you fixed something recently, it's > possible I was running a pre-perf-pull kernel and an after-perf-pull > "perf" binary. Yeah, so I think prior merging d008d5258e9c you'd see those artifacts with new, MMAP2-aware perf tooling. Both older kernels would work fine with any version of the tooling, and old tooling would work fine. Only new tooling used on a kernel within the breakage window would be exposed to this. I think the window of breakage is relatively small (you managed to hit it), but should we add a quirk for this? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/