From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760967AbXGNJkw (ORCPT ); Sat, 14 Jul 2007 05:40:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753765AbXGNJkp (ORCPT ); Sat, 14 Jul 2007 05:40:45 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:35033 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751438AbXGNJko (ORCPT ); Sat, 14 Jul 2007 05:40:44 -0400 From: "Rafael J. Wysocki" To: Joseph Fannin Subject: Re: Hibernating To Swap Considered Harmful Date: Sat, 14 Jul 2007 11:48:17 +0200 User-Agent: KMail/1.9.5 Cc: david@lang.hm, "Huang, Ying" , Andrew Morton , Pavel Machek , nigel@nigel.suspend2.net, Jeremy Maitin-Shepard , linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org References: <1184167831.12556.13.camel@caritas-dev.intel.com> <200707131130.51279.rjw@sisk.pl> <20070714004517.GA18336@nineveh.local> In-Reply-To: <20070714004517.GA18336@nineveh.local> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707141148.18279.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday, 14 July 2007 02:45, Joseph Fannin wrote: > On Fri, Jul 13, 2007 at 11:30:50AM +0200, Rafael J. Wysocki wrote: > > On Friday, 13 July 2007 07:42, Joseph Fannin wrote: > > > On Thu, Jul 12, 2007 at 08:06:43PM -0700, david@lang.hm wrote: > > > > On Thu, 12 Jul 2007, Rafael J. Wysocki wrote: > > > > > > > > Plus we need to figure out how to avoid corrupting filesystems and > > > > > swap in use by the "old" kernel and its processes (hint: a separate > > > > > "hibernation partition" is a no-go). > > > > > > > > I thought the existing hibernation wrote to the swap partition as it's > > > > dedicated space? > > > > > > > > I didn't know that anyone was suggesting writing the hibernation image to > > > > a filesystem that the kernel was activly accessing. > > > > > > I'm suggesting a dedicated, preallocated hibernation *file*, right > > > now. There's no way around it, if hibernation is to be reliable -- > > > otherwise hibernation can fail if the system has used enough of its > > > swap space, so that there isn't enough room to write the hibernate > > > image. > > > > > > Even if it's desirable to allow hibernation to fail if the system is > > > too deep into swap, it's a moot point. > > > > If you're afraid of that, use a dedicated swap file. > > I don't understand what you mean. A dedicated swap file for what? Sorry, I should have been more precise. For hibernation (ie. a swap file that you activate right befor the hibernation). Also tuxonice (formerly known as suspend2) allows you to use regular files hibernation. Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth