From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966331AbXDDMpU (ORCPT ); Wed, 4 Apr 2007 08:45:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S966333AbXDDMpU (ORCPT ); Wed, 4 Apr 2007 08:45:20 -0400 Received: from extu-mxob-2.symantec.com ([216.10.194.135]:42730 "EHLO extu-mxob-2.symantec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966331AbXDDMpT (ORCPT ); Wed, 4 Apr 2007 08:45:19 -0400 X-AuditID: d80ac287-91f24bb000000c42-90-46139dde5f6c Date: Wed, 4 Apr 2007 13:45:06 +0100 (BST) From: Hugh Dickins X-X-Sender: hugh@blonde.wat.veritas.com To: Nick Piggin cc: Andrew Morton , Linus Torvalds , Linux Memory Management List , tee@sgi.com, holt@sgi.com, Andrea Arcangeli , Linux Kernel Mailing List Subject: Re: [rfc] no ZERO_PAGE? In-Reply-To: <20070404102407.GA529@wotan.suse.de> Message-ID: References: <20070329075805.GA6852@wotan.suse.de> <20070330024048.GG19407@wotan.suse.de> <20070404033726.GE18507@wotan.suse.de> <20070404102407.GA529@wotan.suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-OriginalArrivalTime: 04 Apr 2007 12:45:12.0202 (UTC) FILETIME=[15E8CEA0:01C776B7] X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 4 Apr 2007, Nick Piggin wrote: > > No, you have a point, but if we have to ask people to recompile > with CONFIG_ZERO_PAGE, then it isn't much harder to ask them to > apply a patch first. > > But for a potential mainline merge, maybe starting with a CONFIG > option is a good idea -- defaulting to off, and we could start by > turning it on just in -rc kernels for a few releases, to get a bit > more confidence? I'm confused. CONFIG_ZERO_PAGE off is where we'd like to end up: how would turning CONFIG_ZERO_PAGE on in -rc kernels help us to get there? Hugh