From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751131AbVHKRO4 (ORCPT ); Thu, 11 Aug 2005 13:14:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751132AbVHKRO4 (ORCPT ); Thu, 11 Aug 2005 13:14:56 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:45482 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1751131AbVHKROz (ORCPT ); Thu, 11 Aug 2005 13:14:55 -0400 Date: Thu, 11 Aug 2005 18:14:51 +0100 From: Christoph Hellwig To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, dipankar@in.ibm.com, rusty@au1.ibm.com, bmark@us.ibm.com Subject: Re: [RFC,PATCH] Use RCU to protect tasklist for unicast signals Message-ID: <20050811171451.GA5108@infradead.org> Mail-Followup-To: Christoph Hellwig , "Paul E. McKenney" , linux-kernel@vger.kernel.org, mingo@elte.hu, dipankar@in.ibm.com, rusty@au1.ibm.com, bmark@us.ibm.com References: <20050810171145.GA1945@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050810171145.GA1945@us.ibm.com> User-Agent: Mutt/1.4.2.1i X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 10, 2005 at 10:11:45AM -0700, Paul E. McKenney wrote: > Hello! > > This patch is an experiment in use of RCU for individual code paths that > read-acquire the tasklist lock, in this case, unicast signal delivery. > It passes five kernbenches on 4-CPU x86, but obviously needs much more > testing before it is considered for serious use, let alone inclusion. I think we should switch over tasklist_lock to RCU completely instead of adding suck hacks. I've started lots of preparation work to get rid of tasklist_lock users outside of kernel/, especialy getting rid of any use in modules.