Return-Path: <linux-kernel-owner+willy=40w.ods.org-S1751199AbWBUWpO@vger.kernel.org> Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751199AbWBUWpO (ORCPT <rfc822;willy@w.ods.org>); Tue, 21 Feb 2006 17:45:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751201AbWBUWpO (ORCPT <rfc822;linux-kernel-outgoing>); Tue, 21 Feb 2006 17:45:14 -0500 Received: from b3162.static.pacific.net.au ([203.143.238.98]:51102 "EHLO cust8446.nsw01.dataco.com.au") by vger.kernel.org with ESMTP id S1751199AbWBUWpM (ORCPT <rfc822;linux-kernel@vger.kernel.org>); Tue, 21 Feb 2006 17:45:12 -0500 From: Nigel Cunningham <ncunningham@cyclades.com> Organization: Cyclades Corporation To: "Rafael J. Wysocki" <rjw@sisk.pl> Subject: Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.) Date: Wed, 22 Feb 2006 07:00:50 +1000 User-Agent: KMail/1.9.1 Cc: Dmitry Torokhov <dtor_core@ameritech.net>, Andreas Happe <andreashappe@snikt.net>, linux-kernel@vger.kernel.org, Suspend2 Devel List <suspend2-devel@lists.suspend2.net> References: <20060201113710.6320.68289.stgit@localhost.localdomain> <200602202319.15018.dtor_core@ameritech.net> <200602212140.57566.rjw@sisk.pl> In-Reply-To: <200602212140.57566.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart27174856.oxOlyUKcOS"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200602220700.55207.ncunningham@cyclades.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2124 Lines: 59 --nextPart27174856.oxOlyUKcOS Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi Rafael. On Wednesday 22 February 2006 06:40, Rafael J. Wysocki wrote: > On Tuesday 21 February 2006 05:19, Dmitry Torokhov wrote: > > On Monday 20 February 2006 21:57, Nigel Cunningham wrote: > > > For the record, my thinking went: swsusp uses n (12?) bytes of meta > > > data for every page you save, where as using bitmaps makes that much > > > closer to a constant value (a small variable amount for recording whe= re > > > the image will be stored in extents). 12 bytes per page is 3MB/1GB. If > > > swsusp was to add support for multiple swap partitions or writing to > > > files, those requirements might be closer to 5MB/GB. > > > > 5MB/GB amounts to 0.5% overhead, I don't think you should be concerned > > here. Much more important IMHO is that IIRC swsusp requires to be able = to > > free 1/2 of the physical memory whuch is hard on low memory boxes. > > I see another point in using bitmaps: we could avoid modifying page flags > and use bitmaps to store all of the temporary information. I thought abo= ut > it for some time and I think it's doable. It is doable - I'm doing it now, but am thinking about reverting part of th= e=20 code to use pbes again. If you're going to look at using bitmaps in place o= f=20 pbes, me changing would be a waste of time. Do you want me to hold off for = a=20 while? (I'll happily do that, as I have far more than enough to keep me=20 occupied at the moment anyway). Regards, Nigel --nextPart27174856.oxOlyUKcOS Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQBD+3+HN0y+n1M3mo0RAumhAJ9m2XbVhCX0EJpL2sQEYXUamkGenwCg5/eV VzbxQV/zP9LwLsOFSL3wd40= =RYOc -----END PGP SIGNATURE----- --nextPart27174856.oxOlyUKcOS-- - 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/