From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754435AbcJEIJX (ORCPT ); Wed, 5 Oct 2016 04:09:23 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60107 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752909AbcJEIJW (ORCPT ); Wed, 5 Oct 2016 04:09:22 -0400 Date: Wed, 5 Oct 2016 10:09:12 +0200 From: Peter Zijlstra To: Sebastian Andrzej Siewior Cc: mingo@kernel.org, tglx@linutronix.de, juri.lelli@arm.com, rostedt@goodmis.org, xlpang@redhat.com, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, jdesfossez@efficios.com, bristot@redhat.com Subject: Re: [RFC][PATCH 4/4] futex: Rewrite FUTEX_UNLOCK_PI Message-ID: <20161005080912.GF3142@twins.programming.kicks-ass.net> References: <20161003091234.879763059@infradead.org> <20161003091847.704255067@infradead.org> <20161005074147.qws2fx2n3o56y2r4@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161005074147.qws2fx2n3o56y2r4@linutronix.de> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 05, 2016 at 09:41:47AM +0200, Sebastian Andrzej Siewior wrote: > On 2016-10-03 11:12:38 [+0200], Peter Zijlstra wrote: > > There's a number of 'interesting' problems with FUTEX_UNLOCK_PI, all > > caused by holding hb->lock while doing the rt_mutex_unlock() > > equivalient. > > are those problems DL related? One of them, the other is that PI thing you did that ugly nodeboost thing for, right?