From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267223AbUG2JFV (ORCPT ); Thu, 29 Jul 2004 05:05:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267321AbUG2JFV (ORCPT ); Thu, 29 Jul 2004 05:05:21 -0400 Received: from fw.osdl.org ([65.172.181.6]:28847 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S267223AbUG2JFK (ORCPT ); Thu, 29 Jul 2004 05:05:10 -0400 Date: Thu, 29 Jul 2004 02:02:52 -0700 From: Andrew Morton To: Paul Jackson Cc: peter@chubb.wattle.id.au, viro@parcelfarce.linux.theplanet.co.uk, davem@redhat.com, cw@f00f.org, linux-kernel@vger.kernel.org Subject: Re: stat very inefficient Message-Id: <20040729020252.0eaed212.akpm@osdl.org> In-Reply-To: <20040729014940.7f1e3315.pj@sgi.com> References: <233602095@toto.iv> <16648.10711.200049.616183@wombat.chubb.wattle.id.au> <20040728154523.20713ef1.davem@redhat.com> <20040729000837.GA24956@taniwha.stupidest.org> <20040728171414.5de8da96.davem@redhat.com> <20040729002924.GK12308@parcelfarce.linux.theplanet.co.uk> <16648.42669.907048.112765@wombat.chubb.wattle.id.au> <20040729004242.7601f777.akpm@osdl.org> <20040729014940.7f1e3315.pj@sgi.com> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-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 X-Mailing-List: linux-kernel@vger.kernel.org Paul Jackson wrote: > > Andrew wrote: > > hmm. Here's a Pentium III profile ... > > What conclusion do your draw from this profile? At a quick squint: we spend about 10% of total system time in those copy functions. If we halve their runtime (which would be good), we don't gain much.