Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261597AbUCVAuf (ORCPT ); Sun, 21 Mar 2004 19:50:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261606AbUCVAuf (ORCPT ); Sun, 21 Mar 2004 19:50:35 -0500 Received: from ppp-217-133-42-200.cust-adsl.tiscali.it ([217.133.42.200]:1675 "EHLO dualathlon.random") by vger.kernel.org with ESMTP id S261597AbUCVAud (ORCPT ); Sun, 21 Mar 2004 19:50:33 -0500 Date: Mon, 22 Mar 2004 01:51:24 +0100 From: Andrea Arcangeli To: Andrew Morton Cc: m.c.p@wolk-project.de, linux-kernel@vger.kernel.org, torvalds@osdl.org Subject: Re: do we want to kill VM_RESERVED or not? [was Re: 2.6.5-rc1-aa3] Message-ID: <20040322005124.GG3649@dualathlon.random> References: <20040320210306.GA11680@dualathlon.random> <200403211105.05908@WOLK> <20040321114939.GA10787@dualathlon.random> <20040321152427.61d88cea.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040321152427.61d88cea.akpm@osdl.org> User-Agent: Mutt/1.4.1i X-GPG-Key: 1024D/68B9CB43 13D9 8355 295F 4823 7C49 C012 DFA1 686E 68B9 CB43 X-PGP-Key: 1024R/CB4660B9 CC A0 71 81 F4 A0 63 AC C0 4B 81 1D 8C 15 C8 E5 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 705 Lines: 13 On Sun, Mar 21, 2004 at 03:24:27PM -0800, Andrew Morton wrote: > I'd prefer to retain VM_RESERVED and work toward removing PageReserved(). > The latter has a real and measurable cost in put_page(). agreed. Unfortunately removing PageReserved won't be so trivial since it'll be a change to userspace API too, today a PageReserved page through fork() will act as a MAP_SHARED even if it's under a MAP_PRIVATE, so slightly subtle userspace stuff can break then. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/