Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754535AbZGEBMS (ORCPT ); Sat, 4 Jul 2009 21:12:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752893AbZGEBMJ (ORCPT ); Sat, 4 Jul 2009 21:12:09 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:59312 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752822AbZGEBMI (ORCPT ); Sat, 4 Jul 2009 21:12:08 -0400 Date: Sun, 5 Jul 2009 03:11:23 +0200 From: Ingo Molnar To: Jaswinder Singh Rajput Cc: Peter Zijlstra , Arjan van de Ven , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Arnaldo Carvalho de Melo , Paul Mackerras , Anton Blanchard , 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: <20090705011123.GA31673@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> <20090701112406.GE15958@elte.hu> <1246622515.2322.30.camel@jaswinder.satnam> <20090704102230.GE2139@elte.hu> <1246717039.2329.26.camel@jaswinder.satnam> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1246717039.2329.26.camel@jaswinder.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: 1872 Lines: 48 * Jaswinder Singh Rajput wrote: > On Sat, 2009-07-04 at 12:22 +0200, Ingo Molnar wrote: > > * Jaswinder Singh Rajput wrote: > > > > > On Wed, 2009-07-01 at 13:24 +0200, Ingo Molnar wrote: > > > > * 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. > > > > > > > > > > Please let me know that addition of software counter will be > > > in this patch or we can do it incrementally after this patch. > > > > It should be in this series. That way we can cross-check whether > > the soft counts and the hard counts match up and find potential > > bugs that way, etc. > > > > You want to cross check performance counter events ? Yes. The events are also more complete if we add per IRQ source counts as well, not just summary counts. 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/