From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932964AbXCMHxo (ORCPT ); Tue, 13 Mar 2007 03:53:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932997AbXCMHxn (ORCPT ); Tue, 13 Mar 2007 03:53:43 -0400 Received: from smtp.osdl.org ([65.172.181.24]:36583 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932964AbXCMHxm (ORCPT ); Tue, 13 Mar 2007 03:53:42 -0400 Date: Tue, 13 Mar 2007 00:53:34 -0800 From: Andrew Morton To: Christoph Lameter Cc: linux-mm@vger.kernel.org, clameter@sgi.com, linux-kernel@vger.kernel.org Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2 Message-Id: <20070313005334.853559ca.akpm@linux-foundation.org> In-Reply-To: <20070313071325.4920.82870.sendpatchset@schroedinger.engr.sgi.com> References: <20070313071325.4920.82870.sendpatchset@schroedinger.engr.sgi.com> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.19; i686-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 > On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter wrote: > Page table pages have the characteristics that they are typically zero > or in a known state when they are freed. Well if they're zero then perhaps they should be released to the page allocator to satisfy the next __GFP_ZERO request. If that request is for a pagetable page, we break even (except we get to remove special-case code). If that __GFP_ZERO allocation was or some application other than for a pagetable, we win. iow, can we just nuke 'em? (Will require some work in the page allocator) (That work will open the path to using the idle thread to prezero pages)