From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752456AbZHHP2t (ORCPT ); Sat, 8 Aug 2009 11:28:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752303AbZHHP2s (ORCPT ); Sat, 8 Aug 2009 11:28:48 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:52926 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752143AbZHHP2r (ORCPT ); Sat, 8 Aug 2009 11:28:47 -0400 Date: Sat, 8 Aug 2009 17:27:56 +0200 From: Ingo Molnar To: Darren Hart Cc: Peter Zijlstra , "lkml," , linux-rt-users , Thomas Gleixner , Steven Rostedt , John Kacur , Dinakar Guniguntala , John Stultz Subject: Re: [RFC][PATCH] fixup pi_state in futex_requeue on lock steal Message-ID: <20090808152756.GH28892@elte.hu> References: <4A7A1D48.7040309@us.ibm.com> <1249576660.32113.585.camel@twins> <4A7B5D46.7080109@us.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A7B5D46.7080109@us.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Darren Hart wrote: > So, I think we're fine with respect to the pi_state ownership! In > fact I finally managed to catch the lock steal in the requeue loop > in my tracing, and everything worked fine. Going to go rerun a > bunch more tests and see if I hit any other issues, if I do, I > suspect they are unrelated to this. > > Thanks for the help in thinking this through. i've got these queued up: 00235fe: futex: Update woken requeued futex_q lock_ptr 1bbf208: rtmutex: Avoid deadlock in rt_mutex_start_proxy_lock() should i drop them? Ingo