Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754229AbZGALYx (ORCPT ); Wed, 1 Jul 2009 07:24:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751013AbZGALYq (ORCPT ); Wed, 1 Jul 2009 07:24:46 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:44821 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750812AbZGALYq (ORCPT ); Wed, 1 Jul 2009 07:24:46 -0400 Date: Wed, 1 Jul 2009 13:24:06 +0200 From: Ingo Molnar To: Jaswinder Singh Rajput , Peter Zijlstra , Arjan van de Ven , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Arnaldo Carvalho de Melo , Paul Mackerras , Anton Blanchard Cc: Thomas Gleixner , Peter Zijlstra , x86 maintainers , LKML , Alan Cox Subject: Re: [PATCH 4/6 -tip] perf_counter: Add Generalized Hardware interrupt support for AMD Message-ID: <20090701112406.GE15958@elte.hu> References: <1246440815.3403.3.camel@hpdv5.satnam> <1246440909.3403.5.camel@hpdv5.satnam> <1246440977.3403.7.camel@hpdv5.satnam> <1246441043.3403.9.camel@hpdv5.satnam> <1246441094.3403.10.camel@hpdv5.satnam> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1246441094.3403.10.camel@hpdv5.satnam> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1092 Lines: 31 * Jaswinder Singh Rajput wrote: > > $ ./perf stat -e interrupts -e masked -e int-pending-mask-cycles -- ls -lR /usr/include/ > /dev/null > > Performance counter stats for 'ls -lR /usr/include/': > > 377 interrupts > 53429936 int-mask-cycles > 1119 int-pending-mask-cycles > > 0.371457539 seconds time elapsed Agreed, this is another useful generalization - and the 'cycles pending' metrics are not retrievable via any software means. We could and should probably add a software counter for hardirqs as wel. That would allow the vector/irqnr information to be passed in, and it would allow architectures without irq metrics in the PMU to have this counter too. This way we could profile based on a specific interrupt source only - say based on the networking card. 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/