From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934822AbXGLOQl (ORCPT ); Thu, 12 Jul 2007 10:16:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933048AbXGLOQX (ORCPT ); Thu, 12 Jul 2007 10:16:23 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:4627 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1763731AbXGLOQW (ORCPT ); Thu, 12 Jul 2007 10:16:22 -0400 Date: Thu, 12 Jul 2007 14:06:59 +0000 From: Pavel Machek To: david@lang.hm Cc: "Huang, Ying" , Andrew Morton , nigel@nigel.suspend2.net, "Rafael J. Wysocki" , Jeremy Maitin-Shepard , linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation Message-ID: <20070712140658.GA3881@ucw.cz> References: <1184167831.12556.13.camel@caritas-dev.intel.com> <20070711172243.ab44c4d4.akpm@linux-foundation.org> <1184251423.9346.55.camel@caritas-dev.intel.com> <1184260683.9346.91.camel@caritas-dev.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > >Maybe my usage of terminology has some problem. But, > >the "device > >hibernate" here means put device into quiescent state > >and save the > >device state, but do not put device into low power > >state. > > is there really enough savings (in time or otherwise) to > make it worth splitting this into two steps? for Yep. > but I suspect that the number of drivers where this is > worth doing is relativly small, and it may be a better > approach to start off with just putting everything into > the low-power state until some drive shows up that makes > it worth adding the intermediate state to the system We have had this flamewar before, and linus decided 'snapshot' and 'suspend' are different operations - and he's right. Disk takes 10 seconds to suspend/resume (spindown). Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html