From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261823AbULJVkR (ORCPT ); Fri, 10 Dec 2004 16:40:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261825AbULJVkG (ORCPT ); Fri, 10 Dec 2004 16:40:06 -0500 Received: from fw.osdl.org ([65.172.181.6]:23481 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S261816AbULJVjw (ORCPT ); Fri, 10 Dec 2004 16:39:52 -0500 Date: Fri, 10 Dec 2004 13:38:59 -0800 From: Andrew Morton To: Hugh Dickins Cc: clameter@sgi.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: pfault V12 : correction to tasklist rss Message-Id: <20041210133859.2443a856.akpm@osdl.org> In-Reply-To: References: 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 Hugh Dickins wrote: > > > We have no real way of establishing the ownership of shared pages > > anyways. Its counted when allocated. But the page may live on afterwards > > in another process and then not be accounted for although its only user is > > the new process. > > I didn't understand that bit. We did lose some accounting accuracy when the pagetable walk and the big tasklist walks were removed. Bill would probably have more details. Given that the code as it stood was a complete showstopper, the tradeoff seemed reasonable.