From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: Re: [patch 1/3] ipc/sem: fix -rt livelock Date: Fri, 04 Oct 2013 13:28:51 +0200 Message-ID: <524EA673.5050400@linutronix.de> References: <1379051751.5455.112.camel@marge.simpson.net> <1379052760.5455.127.camel@marge.simpson.net> <5234D94D.8010608@colorfullife.com> <1379220340.5545.93.camel@marge.simpson.net> <20131004104450.GB19953@linutronix.de> <1380885410.5432.5.camel@marge.simpson.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Manfred Spraul , linux-rt-users , Steven Rostedt , Thomas Gleixner , Peter Zijlstra To: Mike Galbraith Return-path: Received: from www.linutronix.de ([62.245.132.108]:53203 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751371Ab3JDL2y (ORCPT ); Fri, 4 Oct 2013 07:28:54 -0400 In-Reply-To: <1380885410.5432.5.camel@marge.simpson.net> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 10/04/2013 01:16 PM, Mike Galbraith wrote: > Manfred's race fix also kills loop, and thereby the -rt livelock, so the > only question is does -rt want to use his completion wakeup scheme, and > does it want to do something about spin_unlock_wait() unconditionally > grabbing/releasing every lock in the array. So his patches went into v3.11 or so right? So all -RT released post this point will have it fixed right? However if this is something that bugs people using -RT it might worth looking at it. > -Mike > Sebastian