Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751236AbVKQVZi (ORCPT ); Thu, 17 Nov 2005 16:25:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751254AbVKQVZi (ORCPT ); Thu, 17 Nov 2005 16:25:38 -0500 Received: from smtprelay03.ispgateway.de ([80.67.18.15]:42960 "EHLO smtprelay03.ispgateway.de") by vger.kernel.org with ESMTP id S1751236AbVKQVZi (ORCPT ); Thu, 17 Nov 2005 16:25:38 -0500 From: Ingo Oeser To: linux-kernel@vger.kernel.org Subject: Re: [PATCH 09/11] unpaged: ZERO_PAGE in VM_UNPAGED Date: Thu, 17 Nov 2005 22:25:26 +0100 User-Agent: KMail/1.7.2 Cc: Hugh Dickins , Andrew Morton , Nick Piggin References: In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1256992.g7Bujoyvzu"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200511172225.31973.ioe-lkml@rameria.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1284 Lines: 46 --nextPart1256992.g7Bujoyvzu Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi Hugh, On Thursday 17 November 2005 20:38, Hugh Dickins wrote: > It's strange enough to be looking out for anonymous pages in VM_UNPAGED > areas, let's not insert the ZERO_PAGE there - though whether it would > matter will depend on what we decide about ZERO_PAGE refcounting. We do we refcount ZERO_PAGE at all? Ok, there may be multiple, but they exist always and always at the same physical addresses, right? So why do we care at all? Memory hotplug? Doesn't it suffice there, that they are reverse mappable? Aren't they a perfect candidate for a VM_UNPAGED from /dev/zero :-) Regards Ingo Oeser --nextPart1256992.g7Bujoyvzu Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQBDfPVLU56oYWuOrkARAmeTAJ9DGZB4AMmkeqx0k7u57qOEdkuqRQCdFNP5 EKP/7Pt2Hvv5NnbSVfsam2w= =gzyb -----END PGP SIGNATURE----- --nextPart1256992.g7Bujoyvzu-- - 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/