Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751066AbWC2Mcg (ORCPT ); Wed, 29 Mar 2006 07:32:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751078AbWC2Mcg (ORCPT ); Wed, 29 Mar 2006 07:32:36 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:706 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S1751066AbWC2Mcg (ORCPT ); Wed, 29 Mar 2006 07:32:36 -0500 Date: Wed, 29 Mar 2006 14:29:59 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: Esben Nielsen , linux-kernel@vger.kernel.org Subject: Re: PI patch against 2.6.16-rt9 Message-ID: <20060329122959.GA5175@elte.hu> References: <1143590363.5344.257.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1143590363.5344.257.camel@localhost.localdomain> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: -2.6 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.6 required=5.9 tests=ALL_TRUSTED,AWL,BAYES_50 autolearn=no SpamAssassin version=3.0.3 -3.3 ALL_TRUSTED Did not pass through any untrusted hosts 0.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60% [score: 0.5000] 0.7 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 642 Lines: 17 * Thomas Gleixner wrote: > Btw, your get/put_task proposal adds two atomic ops. Atomic ops are > implicit memory barriers and therefor you add two extra slow downs > into the non conflict case. i'm not that worried about this - the atomic ops are for already cached cachelines, any sane CPU ought to execute them close to full speed. (x86-ish cpus certainly do) Ingo - 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/