From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750992Ab0CAGf0 (ORCPT ); Mon, 1 Mar 2010 01:35:26 -0500 Received: from ksp.mff.cuni.cz ([195.113.26.206]:60375 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750695Ab0CAGfY (ORCPT ); Mon, 1 Mar 2010 01:35:24 -0500 Date: Mon, 1 Mar 2010 07:35:08 +0100 From: Pavel Machek To: Alan Stern Cc: Jens Axboe , "Rafael J. Wysocki" , Maxim Levitsky , linux-pm , linux-kernel , Andrew Morton Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen? Message-ID: <20100301063508.GA1455@ucw.cz> References: <20100223123321.GA1025@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > > This is a matter for Jens. Is the bdi writeback task freezable? If it > > > is, should it be made unfreezable? > > > > I'm not a big expect on what tasks should be freezable or not. As it > > stands, the writeback tasks will attempt to freeze and thaw with the > > system. I guess that screws the sync from resume call, since it's not > > running and the sync will wait for it to retrieve and finish that work > > item. > > > > To the suspend experts - can we safely mark the writeback tasks as > > non-freezable? > > The reason for freezing those tasks is to avoid writebacks at random > times during a system sleep transition, when the underlying device may > already be suspended, right? It is also there to avoid inconsistency between in-filesystem data and snapshot in hibernation image. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html