Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757674AbZGHWOm (ORCPT ); Wed, 8 Jul 2009 18:14:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755183AbZGHWOe (ORCPT ); Wed, 8 Jul 2009 18:14:34 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:49074 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754191AbZGHWOd (ORCPT ); Wed, 8 Jul 2009 18:14:33 -0400 Subject: Re: [patch] perf_counter: Add p6 PMU From: Peter Zijlstra To: Vince Weaver Cc: Ingo Molnar , Paul Mackerras , linux-kernel@vger.kernel.org In-Reply-To: <1247089529.16156.27.camel@laptop> References: <1247051751.9777.49.camel@twins> <1247089529.16156.27.camel@laptop> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 09 Jul 2009 00:14:24 +0200 Message-Id: <1247091264.9777.311.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1084 Lines: 25 On Wed, 2009-07-08 at 23:45 +0200, Peter Zijlstra wrote: > On Wed, 2009-07-08 at 17:46 -0400, Vince Weaver wrote: > > On Wed, 8 Jul 2009, Peter Zijlstra wrote: > > > > > doesn't sound like the right kind of event.. but then, it doesn't > > > have anything better either. > > > > Is there a way to specify "invalid event"? Just setting it to 0 doesn't > > work, on the Pentium Pro event 0 returns what looks like essentially > > random numbers. > > Hmm, bugger. I was assuming writing 0 to the evensel would disable the > counter. Apparently that only works for eventsel1, which would mean we > cannot run counter1 without counter0. That means we'd need to do a > counter swap at times... :/ Ooh, we can instead use a counter that's specified to not count anything for 'disabling' the counter, like event 0x2E with unit mask 0. -- 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/