From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753661AbXDCVA1 (ORCPT ); Tue, 3 Apr 2007 17:00:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753662AbXDCVA0 (ORCPT ); Tue, 3 Apr 2007 17:00:26 -0400 Received: from mx1.redhat.com ([66.187.233.31]:59981 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753651AbXDCVA0 (ORCPT ); Tue, 3 Apr 2007 17:00:26 -0400 Message-ID: <4612C059.8070702@redhat.com> Date: Tue, 03 Apr 2007 17:00:09 -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: Ulrich Drepper , Andi Kleen , Linux Kernel , Jakub Jelinek , linux-mm@kvack.org, Hugh Dickins 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> <20070403135154.61e1b5f3.akpm@linux-foundation.org> In-Reply-To: <20070403135154.61e1b5f3.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: > Oh. I was assuming that we'd want to unmap these pages from pagetables and > mark then super-easily-reclaimable. So a later touch would incur a minor > fault. > > But you think that we should leave them mapped into pagetables so no such > fault occurs. > Leaving the pages mapped into pagetables means that they are considerably > less likely to be reclaimed. If we move the pages to a place where they are very likely to be reclaimed quickly (end of the inactive list, or a separate reclaim list) and clear the dirty and referenced lists, we can both reclaim the page easily *and* avoid the page fault penalty. -- 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.