Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946064AbXBPTAn (ORCPT ); Fri, 16 Feb 2007 14:00:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946050AbXBPTAn (ORCPT ); Fri, 16 Feb 2007 14:00:43 -0500 Received: from 207.47.60.150.static.nextweb.net ([207.47.60.150]:44350 "EHLO webmail.xensource.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946064AbXBPTAm (ORCPT ); Fri, 16 Feb 2007 14:00:42 -0500 User-Agent: Microsoft-Entourage/11.2.5.060620 Date: Fri, 16 Feb 2007 19:00:39 +0000 Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. From: Keir Fraser To: Jeremy Fitzhardinge , Keir Fraser CC: , Andi Kleen , , Ian Pratt , Chris Wright , , Andrew Morton , Steven Hand , Christian Limpach Message-ID: Thread-Topic: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options. Thread-Index: AcdR/L+D/d7q+L3vEduRUwAX8io7RQ== In-Reply-To: <45D5EDDB.7050404@goop.org> 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: 1241 Lines: 25 On 16/2/07 17:46, "Jeremy Fitzhardinge" wrote: > Keir Fraser wrote: >> This initial patchset does not include save/restore support anyway, so in >> fact it would be consistent to have CONFIG_PREEMPT configurable. I'm sure >> that we are going to have some nasty bugs to fix up as a result, but we >> can't fix them until we find them! Then we can convert our save/restore code >> to use the freezer before submitting it for inclusion. > OK. So that makes the only config restriction the 100Hz ticks. We can extend the Xen timer interface quite easily and get rid of this one too. In fact it doesn't *much* matter if the CONFIG_HZ differs from the Xen ticker rate -- we modified the Linux timer ISR to handle timer interrupts at arbitrary times already. The only drawback is that jiffies updates in burts if CONFIG_HZ is higher than the actual tick rate, and this can affect some calibration constants and cause Linux to print out some weird values at start-of-day. -- 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/