Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752169AbZLZQke (ORCPT ); Sat, 26 Dec 2009 11:40:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751806AbZLZQkd (ORCPT ); Sat, 26 Dec 2009 11:40:33 -0500 Received: from one.firstfloor.org ([213.235.205.2]:51017 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751803AbZLZQkc (ORCPT ); Sat, 26 Dec 2009 11:40:32 -0500 Date: Sat, 26 Dec 2009 17:40:29 +0100 From: Andi Kleen To: Arjan van de Ven Cc: Andi Kleen , Linus Torvalds , Mark Hounschell , "Pallipadi, Venkatesh" , "dmarkh@cfl.rr.com" , Alain Knaff , Linux Kernel Mailing List , "fdutils@fdutils.linux.lu" , "Li, Shaohua" , Ingo Molnar Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28 Message-ID: <20091226164029.GA10256@basil.fritz.box> References: <4B3214EC.6020308@compro.net> <6598A4E21F1DB24D80BF72956484F59802EFD1C6@orsmsx001.amr.corp.intel.com> <4B32386B.2060509@compro.net> <87bphpd4rt.fsf@basil.nowhere.org> <20091223170832.GH20539@basil.fritz.box> <20091225132116.6c9089f2@infradead.org> <20091225203304.GA22306@basil.fritz.box> <20091226103835.68479100@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091226103835.68479100@infradead.org> 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: 831 Lines: 25 > > Does pmqos work with apci=off etc.? > > yes > > > I didn't think it shut down > > the classic "HLT" idle, does it? > > it does if you specify a latency of 0; it will then go into the > spin-only state until you give up your latency requirement I looked at it this evening, but it seems like pm_qos is not interrupt safe (e.g. calls blocking notifiers) and floppy currently does enable/disable_hlt from interrupts and bottom halves. Would need some more infrastructure work or restructuring of the floppy driver. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/