From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754109AbeDMJYr (ORCPT ); Fri, 13 Apr 2018 05:24:47 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:40506 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751776AbeDMJYq (ORCPT ); Fri, 13 Apr 2018 05:24:46 -0400 Date: Fri, 13 Apr 2018 10:24:41 +0100 From: Catalin Marinas To: Will Deacon Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, boqun.feng@gmail.com, longman@redhat.com, paulmck@linux.vnet.ibm.com, mingo@kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 00/13] kernel/locking: qspinlock improvements Message-ID: <20180413092441.cebb54suvjufw6m3@armageddon.cambridge.arm.com> References: <1523469680-17699-1-git-send-email-will.deacon@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1523469680-17699-1-git-send-email-will.deacon@arm.com> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 11, 2018 at 07:01:07PM +0100, Will Deacon wrote: > * Spin for a bounded duration while lock is observed in the > pending->locked transition FWIW, I updated my model [1] to include the bounded handover loop and, as expected, it passes the liveness check (well, assuming fairness of other operations like fetch_or, cmpxchg etc). [1] https://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/kernel-tla.git/tree/qspinlock.tla -- Catalin