From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755310AbaCELK0 (ORCPT ); Wed, 5 Mar 2014 06:10:26 -0500 Received: from merlin.infradead.org ([205.233.59.134]:47842 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753553AbaCELKY (ORCPT ); Wed, 5 Mar 2014 06:10:24 -0500 Date: Wed, 5 Mar 2014 12:10:06 +0100 From: Peter Zijlstra To: Andi Kleen Cc: Thomas Gleixner , Khalid Aziz , One Thousand Gnomes , "H. Peter Anvin" , Ingo Molnar , akpm@linux-foundation.org, viro@zeniv.linux.org.uk, oleg@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [RFC] [PATCH] Pre-emption control for userspace Message-ID: <20140305111006.GT9987@twins.programming.kicks-ass.net> References: <1393870033-31076-1-git-send-email-khalid.aziz@oracle.com> <531641A8.40306@zytor.com> <53164824.3000704@oracle.com> <20140304222356.41c55bbc@alan.etchedpixels.co.uk> <5316574F.6040105@oracle.com> <8738ix5uyk.fsf@tassilo.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8738ix5uyk.fsf@tassilo.jf.intel.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 04, 2014 at 04:51:15PM -0800, Andi Kleen wrote: > Anything else? Proxy execution; its a form of PI that works for arbitrary scheduling policies (thus also very much including fair). With that what you effectively end up with is the lock holder running 'boosted' by the runtime of its blocked chain until the entire chain runs out of time, at which point preemption doesn't matter anyhow.