From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751348AbaLZQwG (ORCPT ); Fri, 26 Dec 2014 11:52:06 -0500 Received: from mail-pd0-f172.google.com ([209.85.192.172]:50672 "EHLO mail-pd0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751173AbaLZQwE (ORCPT ); Fri, 26 Dec 2014 11:52:04 -0500 Message-ID: <549D922F.3020101@gmail.com> Date: Fri, 26 Dec 2014 09:51:59 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Namhyung Kim , Arnaldo Carvalho de Melo CC: Ingo Molnar , Peter Zijlstra , Jiri Olsa , LKML , Stephane Eranian , Adrian Hunter , Andi Kleen , Frederic Weisbecker Subject: Re: [PATCH 05/37] perf tools: Create separate mmap for dummy tracking event References: <1419405333-27952-1-git-send-email-namhyung@kernel.org> <1419405333-27952-6-git-send-email-namhyung@kernel.org> In-Reply-To: <1419405333-27952-6-git-send-email-namhyung@kernel.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/24/14 12:15 AM, Namhyung Kim wrote: > When multi file support is enabled, a dummy tracking event will be > used to track metadata (like task, comm and mmap events) for a session > and actual samples will be recorded in separate files. > > Provide separate mmap to the dummy tracking event. The size is fixed > to 128KiB (+ 1 page) as the event rate will be lower than samples. I Have you tried stress tests like a kernel compile with -j Ncpus (Ncpus = 16 or higher)? David