Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754994Ab0HXNI3 (ORCPT ); Tue, 24 Aug 2010 09:08:29 -0400 Received: from casper.infradead.org ([85.118.1.10]:49963 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752677Ab0HXNI1 convert rfc822-to-8bit (ORCPT ); Tue, 24 Aug 2010 09:08:27 -0400 Subject: Re: [PATCH 0/4] Finer granularity and task/cgroup irq time accounting From: Peter Zijlstra To: balbir@linux.vnet.ibm.com Cc: Venkatesh Pallipadi , Martin Schwidefsky , Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner , Paul Menage , linux-kernel@vger.kernel.org, Paul Turner , Heiko Carstens , Paul Mackerras , Tony Luck In-Reply-To: <20100824124726.GQ4684@balbir.in.ibm.com> References: <1279583835-22854-1-git-send-email-venki@google.com> <20100720095546.2f899e04@mschwide.boeblingen.de.ibm.com> <20100722131239.208d9501@mschwide.boeblingen.de.ibm.com> <1282636286.2605.2307.camel@laptop> <20100824080515.GK4684@balbir.in.ibm.com> <1282640953.2605.2428.camel@laptop> <20100824113801.GO4684@balbir.in.ibm.com> <1282650835.2605.2629.camel@laptop> <20100824124726.GQ4684@balbir.in.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Tue, 24 Aug 2010 15:08:14 +0200 Message-ID: <1282655294.2605.2716.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 945 Lines: 23 On Tue, 2010-08-24 at 18:17 +0530, Balbir Singh wrote: > > "There are usecases where reporting this time against task > or task groups or cgroups will be useful for user/administrator > in terms of resource planning and utilization charging" Or confusing, what happens if you attribute the IRQ overhead of a ping-flood to your tasks? By not providing these numbers per task/group people will have to actually think about what it is that is causing these high irq loads and have a chance of actually doing better than random attribution. So no, providing random numbers on the slight chance that they might possibly make sense for your workload doesn't seem like a sound reason to provide them. -- 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/