From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760464AbXGEPUa (ORCPT ); Thu, 5 Jul 2007 11:20:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757497AbXGEPUX (ORCPT ); Thu, 5 Jul 2007 11:20:23 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:54071 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757448AbXGEPUW (ORCPT ); Thu, 5 Jul 2007 11:20:22 -0400 From: "Rafael J. Wysocki" To: Matthew Garrett Subject: Re: removing refrigerator does not help with s2ram vs. fuse deadlocks (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway) Date: Thu, 5 Jul 2007 17:27:35 +0200 User-Agent: KMail/1.9.5 Cc: Pavel Machek , Paul Mackerras , Alan Stern , Johannes Berg , Linux-pm mailing list , Kernel development list References: <18059.6726.218205.104212@cargo.ozlabs.ibm.com> <200707051704.48137.rjw@sisk.pl> <20070705150301.GB23647@srcf.ucam.org> In-Reply-To: <20070705150301.GB23647@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707051727.36715.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thursday, 5 July 2007 17:03, Matthew Garrett wrote: > On Thu, Jul 05, 2007 at 05:04:47PM +0200, Rafael J. Wysocki wrote: > > On Thursday, 5 July 2007 16:39, Matthew Garrett wrote: > > > Why? > > > > You have processes that don't react to signals, because some other user land > > task is misbehaving. I'd call that ugly at the very least. > > It already happens with, say, NFS. Don't think about it in terms of a > userland task misbehaving - think of it in terms of a resource becoming > unavailable. I think there's a difference between a userland task playing the role of a resource and a "real" external resource the kernel doesn't control. IMO, userland tasks should not have the power to affect each other as though they were parts of the kernel. Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth