From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934086AbcA0QGQ (ORCPT ); Wed, 27 Jan 2016 11:06:16 -0500 Received: from one.firstfloor.org ([193.170.194.197]:35492 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932265AbcA0QGO (ORCPT ); Wed, 27 Jan 2016 11:06:14 -0500 Date: Wed, 27 Jan 2016 17:06:12 +0100 From: Andi Kleen To: Namhyung Kim Cc: Arnaldo Carvalho de Melo , Ingo Molnar , Peter Zijlstra , Jiri Olsa , LKML , Andi Kleen , David Ahern , Frederic Weisbecker , Wang Nan , Taeung Song Subject: Re: [RFC/PATCH 10/10] perf tools: Change default calchain percent limit to 0.005% Message-ID: <20160127160611.GI31686@two.firstfloor.org> References: <1453909257-26015-1-git-send-email-namhyung@kernel.org> <1453909257-26015-11-git-send-email-namhyung@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1453909257-26015-11-git-send-email-namhyung@kernel.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 28, 2016 at 12:40:57AM +0900, Namhyung Kim wrote: > The current default limit of 0.5% is (mostly) for 'fractal' mode which > calculates the percentage relatively. As we changed the default > callchain mode to 'graph', the existing limit is too high IMHO. > Normally there're many entries under 0.5% overhead, it'd be supprising > that they don't show callchains. It's too small imho. On more complex workloads with a lot of user space code we often end up with default perf report --stdio callgraph output of several hundred KB, and most of it is useless as it is only very small. -Andi