Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753282AbYFWHu1 (ORCPT ); Mon, 23 Jun 2008 03:50:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752562AbYFWHt5 (ORCPT ); Mon, 23 Jun 2008 03:49:57 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:42440 "EHLO gprs189-60.eurotel.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752235AbYFWHt5 (ORCPT ); Mon, 23 Jun 2008 03:49:57 -0400 Date: Mon, 23 Jun 2008 09:16:01 +0200 From: Pavel Machek To: Kyle Moffett Cc: "Rafael J. Wysocki" , Matthew Garrett , David Chinner , Jeremy Fitzhardinge , xfs-masters@oss.sgi.com, Linux Kernel Mailing List Subject: Re: freeze vs freezer Message-ID: <20080623071601.GA1553@elf.ucw.cz> References: <4744FD87.7010301@goop.org> <200711262253.35420.rjw@sisk.pl> <20071127053846.GA28884@srcf.ucam.org> <200711271840.24825.rjw@sisk.pl> <8B00F353-983F-40E7-931B-EA73CCD32F0A@mac.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8B00F353-983F-40E7-931B-EA73CCD32F0A@mac.com> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1240 Lines: 32 Hi! (replying to *very* old mail). >>>> We wait until they can continue. >>> >>> So if I have a process blocked on an unavilable NFS mount, I can't >>> suspend? >> >> That's correct, you can't. >> >> [And I know what you're going to say. ;-)] > > Why exactly does suspend/hibernation depend on "TASK_INTERRUPTIBLE" instead > of a zero preempt_count()? Really what we should do is just iterate over > all of the actual physical devices and tell each one "Block new IO requests > preemptably, finish pending DMA, put the hardware in low-power mode, and > prepare for suspend/hibernate". As long as each driver knows how to do > those simple things we can have an entirely consistent kernel image for > both suspend and for hibernation. Patch would be welcome, actually. It turns out blocking new IO-requests is not completely trivial. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/