From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933247AbZHDSXv (ORCPT ); Tue, 4 Aug 2009 14:23:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933184AbZHDSXv (ORCPT ); Tue, 4 Aug 2009 14:23:51 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:41117 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933131AbZHDSXu (ORCPT ); Tue, 4 Aug 2009 14:23:50 -0400 Date: Tue, 4 Aug 2009 11:22:46 -0700 From: Andrew Morton To: Mel Gorman Cc: Larry Woodman , riel@redhat.com, Ingo Molnar , Peter Zijlstra , LKML , linux-mm@kvack.org Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events Message-Id: <20090804112246.4e6d0ab1.akpm@linux-foundation.org> In-Reply-To: <1249409546-6343-5-git-send-email-mel@csn.ul.ie> References: <1249409546-6343-1-git-send-email-mel@csn.ul.ie> <1249409546-6343-5-git-send-email-mel@csn.ul.ie> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 4 Aug 2009 19:12:26 +0100 Mel Gorman wrote: > This patch adds a simple post-processing script for the page-allocator-related > trace events. It can be used to give an indication of who the most > allocator-intensive processes are and how often the zone lock was taken > during the tracing period. Example output looks like > > find-2840 > o pages allocd = 1877 > o pages allocd under lock = 1817 > o pages freed directly = 9 > o pcpu refills = 1078 > o migrate fallbacks = 48 > - fragmentation causing = 48 > - severe = 46 > - moderate = 2 > - changed migratetype = 7 The usual way of accumulating and presenting such measurements is via /proc/vmstat. How do we justify adding a completely new and different way of doing something which we already do?