From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751837Ab3KSCRq (ORCPT ); Mon, 18 Nov 2013 21:17:46 -0500 Received: from mail-pd0-f182.google.com ([209.85.192.182]:55183 "EHLO mail-pd0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751416Ab3KSCRn (ORCPT ); Mon, 18 Nov 2013 21:17:43 -0500 Message-ID: <528ACA41.4030202@gmail.com> Date: Mon, 18 Nov 2013 19:17:37 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Namhyung Kim CC: Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, jolsa@redhat.com, Frederic Weisbecker , Mike Galbraith , Stephane Eranian Subject: Re: [PATCH 4/5] perf record: mmap output file - v5 References: <1384267617-3446-1-git-send-email-dsahern@gmail.com> <1384267617-3446-5-git-send-email-dsahern@gmail.com> <20131112145707.GV5056@laptop.programming.kicks-ass.net> <20131112150751.GA19321@ghostprotocols.net> <20131112151944.GX5056@laptop.programming.kicks-ass.net> <52824AE3.4050207@gmail.com> <20131112211121.GC25913@gmail.com> <20131113113439.GI21461@twins.programming.kicks-ass.net> <52864ED1.1080607@gmail.com> <20131118090117.GE3866@twins.programming.kicks-ass.net> <20131118094036.GA26251@gmail.com> <877gc5utkf.fsf@sejong.aot.lge.com> <528AB229.6030603@gmail.com> <87wqk5t9yd.fsf@sejong.aot.lge.com> In-Reply-To: <87wqk5t9yd.fsf@sejong.aot.lge.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/18/13, 7:13 PM, Namhyung Kim wrote: > I think it should be > > perf record -e cycles -F 4000 -e faults -c 1 --call-graph dwarf,8192 -a -- sleep 1 > > (at least to generate the feedback spiral more efficiently..) you don't need the cycles. faults by itself works. Each event contains > 2 pages of data in the sample. With mmap-based output a single sample (1 page fault in any process) generates 2-3 page faults by perf which cause 2-3 >8k samples to be generated, which generates faults, .... David