From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1425467AbWLHMHn (ORCPT ); Fri, 8 Dec 2006 07:07:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1425446AbWLHMHa (ORCPT ); Fri, 8 Dec 2006 07:07:30 -0500 Received: from sp604002mt.neufgp.fr ([84.96.92.61]:61081 "EHLO sMtp.neuf.fr" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1425461AbWLHMHR (ORCPT ); Fri, 8 Dec 2006 07:07:17 -0500 Date: Fri, 08 Dec 2006 13:04:15 +0100 From: Eric Dumazet Subject: Re: [patch 01/13] io-accounting: core statistics In-reply-to: <200612081152.kB8BqOkh019750@shell0.pdx.osdl.net> To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, balbir@in.ibm.com, csturtiv@sgi.com, daw@sgi.com, guillaume.thouvenin@bull.net, jlan@sgi.com, nagar@watson.ibm.com, tee@sgi.com Message-id: <457954BF.7040707@cosmosbay.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 8BIT References: <200612081152.kB8BqOkh019750@shell0.pdx.osdl.net> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org akpm@osdl.org a écrit : > From: Andrew Morton > > The present per-task IO accounting isn't very useful. It simply counts the > number of bytes passed into read() and write(). So if a process reads 1MB > from an already-cached file, it is accused of having performed 1MB of I/O, > which is wrong. Any chance we can report some io accounting values in getresource()/wait4()... too ? # /usr/bin/time find /usr -name 'foo' 0.24user 0.22system 0:00.70elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+222minor)pagefaults 0swaps