From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753936AbXDDScO (ORCPT ); Wed, 4 Apr 2007 14:32:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932096AbXDDSJo (ORCPT ); Wed, 4 Apr 2007 14:09:44 -0400 Received: from mx1.redhat.com ([66.187.233.31]:33939 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753936AbXDDSJf (ORCPT ); Wed, 4 Apr 2007 14:09:35 -0400 Message-ID: <4613E9AF.3030802@redhat.com> Date: Wed, 04 Apr 2007 14:08:47 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 1.5.0.7 (X11/20061008) MIME-Version: 1.0 To: Andrew Morton CC: Hugh Dickins , Jakub Jelinek , Ulrich Drepper , Andi Kleen , Linux Kernel , linux-mm@kvack.org Subject: Re: missing madvise functionality References: <46128051.9000609@redhat.com> <46128CC2.9090809@redhat.com> <20070403172841.GB23689@one.firstfloor.org> <20070403125903.3e8577f4.akpm@linux-foundation.org> <4612B645.7030902@redhat.com> <20070403202937.GE355@devserv.devel.redhat.com> <20070403144948.fe8eede6.akpm@linux-foundation.org> <20070403160231.33aa862d.akpm@linux-foundation.org> <20070404110406.c79b850d.akpm@linux-foundation.org> In-Reply-To: <20070404110406.c79b850d.akpm@linux-foundation.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: > There are other ways of doing it - I guess we could use a new page flag to > indicate that this is one-of-those-pages, and add new code to handle it in > all the right places. That's what I did. I'm currently working on the zap_page_range() side of things. > One thing which we haven't sorted out with all this stuff: once the > application has marked an address range (and some pages) as > whatever-were-going-call-this-feature, how does the application undo that > change? It doesn't have to do anything. Just access the page and the MMU will mark it dirty/accessed and the VM will not reclaim it. > What effect will things like mremap, madvise and mlock have upon > these pages? Good point. I had not thought about these. Would you mind if I sent an initial proof of concept patch that does not take these into account, before we decide on what should happen in these cases? :) -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic.