From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750773AbWFMRbl (ORCPT ); Tue, 13 Jun 2006 13:31:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750776AbWFMRbl (ORCPT ); Tue, 13 Jun 2006 13:31:41 -0400 Received: from mx2.suse.de ([195.135.220.15]:59881 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S1750773AbWFMRbl (ORCPT ); Tue, 13 Jun 2006 13:31:41 -0400 From: Andi Kleen To: rohitseth@google.com Subject: Re: [PATCH]: Adding a counter in vma to indicate the number =?iso-8859-15?q?of=09physical_pages_backing?= it Date: Tue, 13 Jun 2006 19:31:36 +0200 User-Agent: KMail/1.9.3 Cc: Nick Piggin , Andrew Morton , Linux-mm@kvack.org, Linux-kernel@vger.kernel.org References: <1149903235.31417.84.camel@galaxy.corp.google.com> <200606130551.23825.ak@suse.de> <1150217948.9576.67.camel@galaxy.corp.google.com> In-Reply-To: <1150217948.9576.67.camel@galaxy.corp.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200606131931.36165.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > This information is for user land applications to have the knowledge of > which virtual ranges are getting actively used and which are not. If you think the kernel needs better information on that wouldn't it be better to use the page accessed bits of the hardware more aggressively? Before giving up and adding hacks like you're proposing it would be better to explore fully automatic mechanisms fully. -Andi