From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760218AbYECJFV (ORCPT ); Sat, 3 May 2008 05:05:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757125AbYECJFH (ORCPT ); Sat, 3 May 2008 05:05:07 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:55420 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1756088AbYECJFF (ORCPT ); Sat, 3 May 2008 05:05:05 -0400 Date: Sat, 03 May 2008 02:05:02 -0700 (PDT) Message-Id: <20080503.020502.226847930.davem@davemloft.net> To: mingo@elte.hu Cc: a.p.zijlstra@chello.nl, efault@gmx.de, elendil@planet.nl, parag.warudkar@gmail.com, linux-kernel@vger.kernel.org, guichaz@yahoo.fr, andi@firstfloor.org Subject: Re: 'global' rq->clock From: David Miller In-Reply-To: <20080503082849.GA29605@elte.hu> References: <20080502.144827.158329188.davem@davemloft.net> <1209766054.6929.29.camel@lappy> <20080503082849.GA29605@elte.hu> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ingo Molnar Date: Sat, 3 May 2008 10:28:50 +0200 > * Peter Zijlstra wrote: > > > Yeah, I was thinking of a way for architectures to signify how much > > help they need building the various clocks. Sparc, power and s390 > > would not need any help. > > there's already such a mechanism in sched-devel.git (and has been there > for a week or two): an architecture can set time_sync_thresh to -1LL > during early bootup and essentially disable all the synchronization > logic. Does it remove all of the code too? :-) Please give us a config boolean. The only platform for which a run-time knob is even necessary is x86. Thanks.