From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753368AbXGIEjz (ORCPT ); Mon, 9 Jul 2007 00:39:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750788AbXGIEjs (ORCPT ); Mon, 9 Jul 2007 00:39:48 -0400 Received: from smtp105.mail.mud.yahoo.com ([209.191.85.215]:23204 "HELO smtp105.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750750AbXGIEjs (ORCPT ); Mon, 9 Jul 2007 00:39:48 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=bBlUP+ly+PYkfStrNUC07ZU8dbElNdlxVjeEp8mU1/s8vFbqiw2NCF0G4ctp+yusurD07dqFy3ajQVToXabASN8sc9g2ICUoNx41Aif7gmJh46Bol9Ub7KvuYz4oJrg+p13FIqmFUHDPXnCOxgZwNDYBHws0IKiuahXKFzqiqr0= ; X-YMail-OSG: vxPoX9MVM1mPMBXespjUqLBJDoIL2z5om9Pe_eDy0l1QTa7DDoa6dYiAICYYgZGuXo4fBogQDwWL97c7W_pHIq0sa_4KItnJ9bPnwGgbx.82m77rntQ- Message-ID: <4691BC0F.8050909@yahoo.com.au> Date: Mon, 09 Jul 2007 14:39:43 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 CC: Jeremy Maitin-Shepard , Al Boldi , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: Hibernation Redesign References: <200707081737.21932.a1426z@gawab.com> <87tzsew712.fsf@jbms.ath.cx> <4691B9A5.6060203@yahoo.com.au> In-Reply-To: <4691B9A5.6060203@yahoo.com.au> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Nick Piggin wrote: > Jeremy Maitin-Shepard wrote: > >> Al Boldi writes: >> >> >>> Pavel Machek wrote: >>> >>>> We are stuck with refrigerator for now, and at least for hibernation, >>>> I don't see any feasible alternative. >> >> >> >>> Feasible alternative? >> >> >> >> I posted such an alternative to the list a short time ago: hibenrating >> from a *new* kernel space/user space that is created by loading a new >> kernel in a manner similar to what is done for kexec crashdumps. Unlike >> kexec crashdumps, however, it would not require reserving any memory at >> boot, because the necessary memory (maybe 16MB or 64MB) can be freed >> just before hibernating, and device drivers can be properly stopped so >> that DMAs don't stomp over certain memory. > > > This is the Morton method, isn't it? :) I remember it sounding like a > very good idea when he brought it up, but I can't remember the details > of why it was rejected or what the problems were. Hmm, and it seems like I won't get to know without reliving what looks like an epic flamewar starting.... here: http://thread.gmane.org/gmane.linux.kernel/374889 However from a quick look it seems like the only reason is the RAM overhead of a reserve area. It seems unfortunate that it was dismissed so quickly because of that problem (which could be improved). -- SUSE Labs, Novell Inc.