From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753641Ab0E1SQZ (ORCPT ); Fri, 28 May 2010 14:16:25 -0400 Received: from casper.infradead.org ([85.118.1.10]:48175 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753450Ab0E1SQY (ORCPT ); Fri, 28 May 2010 14:16:24 -0400 Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8) From: Peter Zijlstra To: Zygo Blaxell Cc: Brian Swetland , Alan Cox , Matthew Garrett , Igor Stoppa , tytso@mit.edu, LKML , Florian Mickler , Linux PM , Thomas Gleixner , Linux OMAP Mailing List , "Balbi Felipe (Nokia-D/Helsinki)" In-Reply-To: <20100528172713.GA7444@gibbs.hungrycats.org> References: <20100528114123.GA22947@srcf.ucam.org> <4BFFB681.1000105@nokia.com> <4BFFC5DF.5030504@nokia.com> <20100528133900.GG26177@thunk.org> <4BFFCFC7.7070302@nokia.com> <20100528142124.GA26733@srcf.ucam.org> <20100528160628.7c121dab@lxorguk.ukuu.org.uk> <20100528172713.GA7444@gibbs.hungrycats.org> Content-Type: text/plain; charset="UTF-8" Date: Fri, 28 May 2010 20:16:20 +0200 Message-ID: <1275070580.1645.379.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2010-05-28 at 13:27 -0400, Zygo Blaxell wrote: > From my reading of this thread, there's a lot of overlap between > suspendblockers and constraints. Many use cases are served equally > well with one or the other, If using suspend-blockers, Please explain to me how: - I will avoid the cpu going into some idle state for which the wakeup latency is larger than my RT app fancies? - to avoid some tasks from being serviced by the filesystems whilst others are? (ionice on steroids). - does my sporadic task (with strict bandwidth budget) not suffer bandwidth inversion? suspend blockers do a bit of each of that, but none of it in a usable fashion.