From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id ACE496B004F for ; Tue, 4 Aug 2009 13:58:40 -0400 (EDT) Message-ID: <4A787D84.2030207@redhat.com> Date: Tue, 04 Aug 2009 14:27:16 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 4/4] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events References: <1249409546-6343-1-git-send-email-mel@csn.ul.ie> <1249409546-6343-5-git-send-email-mel@csn.ul.ie> <20090804112246.4e6d0ab1.akpm@linux-foundation.org> In-Reply-To: <20090804112246.4e6d0ab1.akpm@linux-foundation.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: Mel Gorman , Larry Woodman , Ingo Molnar , Peter Zijlstra , LKML , linux-mm@kvack.org List-ID: Andrew Morton wrote: > 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? Mel's tracing is more akin to BSD process accounting, where these statistics are kept on a per-process basis. Nothing in /proc allows us to see statistics on a per process basis on process exit. -- All rights reversed. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org