Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261168AbUKVWpT (ORCPT ); Mon, 22 Nov 2004 17:45:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261171AbUKVWnA (ORCPT ); Mon, 22 Nov 2004 17:43:00 -0500 Received: from fw.osdl.org ([65.172.181.6]:64665 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S261168AbUKVWlI (ORCPT ); Mon, 22 Nov 2004 17:41:08 -0500 Date: Mon, 22 Nov 2004 14:45:07 -0800 From: Andrew Morton To: Christoph Lameter Cc: hugh@veritas.com, torvalds@osdl.org, benh@kernel.crashing.org, nickpiggin@yahoo.com.au, linux-mm@kvack.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: deferred rss update instead of sloppy rss Message-Id: <20041122144507.484a7627.akpm@osdl.org> In-Reply-To: References: <20041122141148.1e6ef125.akpm@osdl.org> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i586-pc-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 Content-Length: 731 Lines: 18 Christoph Lameter wrote: > > > just to prevent transient gross inaccuracies. For some value of "16". > > The page fault code only increments rss. For larger transactions that > increase / decrease rss significantly the page_table_lock is taken and > mm->rss is updated directly. So no > gross inaccuracies can result. Sure. Take a million successive pagefaults and mm->rss is grossly inaccurate. Hence my suggestion that it be spilled into mm->rss periodically. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/