Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752345AbXITTtZ (ORCPT ); Thu, 20 Sep 2007 15:49:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750864AbXITTtS (ORCPT ); Thu, 20 Sep 2007 15:49:18 -0400 Received: from 1wt.eu ([62.212.114.60]:2590 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750793AbXITTtR (ORCPT ); Thu, 20 Sep 2007 15:49:17 -0400 Date: Thu, 20 Sep 2007 21:48:13 +0200 From: Willy Tarreau To: Mike Galbraith Cc: Tong Li , Ingo Molnar , dimm , linux-kernel@vger.kernel.org, Srivatsa Vaddagiri , Peter Zijlstra Subject: Re: [git] CFS-devel, group scheduler, fixes Message-ID: <20070920194813.GH10199@1wt.eu> References: <1190144190.5204.24.camel@earth> <20070918201622.GA1632@elte.hu> <1190183324.9737.7.camel@Homer.simpson.net> <1190188261.9185.21.camel@Homer.simpson.net> <1190191368.8687.5.camel@Homer.simpson.net> <1190264114.6411.4.camel@Homer.simpson.net> <1190272507.27867.20.camel@Homer.simpson.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1190272507.27867.20.camel@Homer.simpson.net> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1707 Lines: 40 On Thu, Sep 20, 2007 at 09:15:07AM +0200, Mike Galbraith wrote: > But, I did just manage to trigger some horrid behavior, and log it. I > modified the kernel to print task's actual tree key instead of their > current vruntime, and was watching that while make -j2 was running (and > not seeing anything very interesting), when on a lark, I restarted > SuSE's system updater thingy. That beast chews 100% CPU for so long at > startup that I long ago got annoyed, and changed it to run at nice 19. > Anyway, when it started, interactivity went to hell in the proverbial > hand-basket, and the sched_debug log shows some interesting results.. > like spread0 hitting -13659412644, and cc1 being keyed at -3867063305. > > cpu#0, 2992.608 MHz > .nr_running : 4 > .load : 4096 > .nr_switches : 1105882 > .nr_load_updates : 735146 > .nr_uninterruptible : 4294966399 (...) > cpu#1, 2992.608 MHz > .nr_running : 5 > .load : 6208 > .nr_switches : 1012995 > .nr_load_updates : 747540 > .nr_uninterruptible : 897 I don't know if this is relevant, but 4294966399 in nr_uninterruptible for cpu#0 equals -897, exactly the negation of cpu1.nr_uninterruptible. I don't know if this rings a bell for someone or if it's a completely useless comment, but just in case... HTH, Willy - 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/