Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934412AbXFFMyz (ORCPT ); Wed, 6 Jun 2007 08:54:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762162AbXFFMys (ORCPT ); Wed, 6 Jun 2007 08:54:48 -0400 Received: from 207.47.60.4.static.nextweb.net ([207.47.60.4]:62854 "EHLO rpc.xensource.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1761469AbXFFMyr (ORCPT ); Wed, 6 Jun 2007 08:54:47 -0400 User-Agent: Microsoft-Entourage/11.3.3.061214 Date: Wed, 06 Jun 2007 13:54:44 +0100 Subject: Re: [Xen-devel] [patch 14/33] xen: xen time implementation From: Keir Fraser To: Jan Beulich , Andi Kleen CC: Jeremy Fitzhardinge , Xen-devel , Andrew Morton , lkml , Chris Wright , , Ingo Molnar , Linus Torvalds , Thomas Gleixner Message-ID: Thread-Topic: [Xen-devel] [patch 14/33] xen: xen time implementation Thread-Index: AceoOdrAGSgBOhQtEdyEZAAX8io7RQ== In-Reply-To: <4666C8E3.76E4.0078.0@novell.com> Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1089 Lines: 27 On 6/6/07 13:46, "Jan Beulich" wrote: >> On the other hand some timing issues on throttling are probably >> the smallest of the users' problems when it really happens. > > Not if this results in your box hanging - I think throttling is exactly > intended > to keep the box alive as long as possible (and I've seen throttling in action, > with the box happily recovering from the situation - after having seen it a > few times I checked and found the fan covered with dust). Clamping to last returned timestamp value would be fine here. Time would go moderately haywire for a while (lurch forwards and then stop for a while), but wouldn't go backwards and should recover reasonably within the timescale of the thermal event itself. I don't see an issue with just implementing this clamping if it is needed. -- Keir - 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/