From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932347AbZHGLT4 (ORCPT ); Fri, 7 Aug 2009 07:19:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751144AbZHGLT4 (ORCPT ); Fri, 7 Aug 2009 07:19:56 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:42856 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750856AbZHGLTz (ORCPT ); Fri, 7 Aug 2009 07:19:55 -0400 Date: Fri, 7 Aug 2009 13:19:49 +0200 From: Ingo Molnar To: "Metzger, Markus T" Cc: Peter Zijlstra , "tglx@linutronix.de" , "hpa@zytor.com" , "markus.t.metzger@gmail.com" , "linux-kernel@vger.kernel.org" Subject: Re: [patch] x86, perf_counter, bts: add bts to perf_counter Message-ID: <20090807111949.GA30014@elte.hu> References: <20090721155648.A17047@sedona.ch.intel.com> <1249381489.7924.186.camel@twins> <20090804111412.GA20942@elte.hu> <20090804113555.GA28198@elte.hu> <928CFBE8E7CB0040959E56B4EA41A77EC1BFEEE3@irsmsx504.ger.corp.intel.com> <1249633282.32113.613.camel@twins> <928CFBE8E7CB0040959E56B4EA41A77EC1BFEFEB@irsmsx504.ger.corp.intel.com> <20090807103127.GA23139@elte.hu> <20090807103610.GA23728@elte.hu> <928CFBE8E7CB0040959E56B4EA41A77EC1BFF02D@irsmsx504.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <928CFBE8E7CB0040959E56B4EA41A77EC1BFF02D@irsmsx504.ger.corp.intel.com> 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 note, i had this running in the background, as root: /home/mingo/bin/perf top >/dev/null 2>/dev/null& that is what interacted most likely. I killed that task and did a user-space only recording via: titan:~> perf record -f -e branches:u -c 1 ./loop_1b_instructions and that succeeded: ^C[ perf record: Captured and wrote 827.901 MB perf.data (~36171547 samples) ] to make BTS sampling really practical we need a 'flight data recorder' mode for the mmap buffer (overwrite mode), right? Peter sent you a patch for that some time ago - did anything good happen to that patch? Ingo