From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755335Ab1IMQOO (ORCPT ); Tue, 13 Sep 2011 12:14:14 -0400 Received: from casper.infradead.org ([85.118.1.10]:39234 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755159Ab1IMQOM convert rfc822-to-8bit (ORCPT ); Tue, 13 Sep 2011 12:14:12 -0400 Subject: Re: [ANNOUNCE] 3.0.4-rt13 From: Peter Zijlstra To: Mike Galbraith Cc: Thomas Gleixner , LKML , linux-rt-users Date: Tue, 13 Sep 2011 18:13:50 +0200 In-Reply-To: <1315927699.6445.6.camel@marge.simson.net> References: <1315737307.6544.1.camel@marge.simson.net> <1315817948.26517.16.camel@twins> <1315835562.6758.3.camel@marge.simson.net> <1315839187.6758.8.camel@marge.simson.net> <1315926499.5977.19.camel@twins> <1315927699.6445.6.camel@marge.simson.net> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.0.3- Message-ID: <1315930430.5977.21.camel@twins> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2011-09-13 at 17:28 +0200, Mike Galbraith wrote: > On Tue, 2011-09-13 at 17:08 +0200, Peter Zijlstra wrote: > > On Tue, 2011-09-13 at 15:36 +0200, Peter Zijlstra wrote: > > > Does the below cure things? It breaks !rt builds, but we can cure that > > > if it works.. > > > > n/m its broken like hell.. > > Since this seems to be a legitimate need for a non-preemptive wakeup, > how about we [re]create one to get rid of abuse? (otoh, that would add > a branch everywhere.. btdt a couple times, always ended up tossing it) Nah, we absolutely need to kill that preempt_disable/enable stuff in there, it covers an O(n^2) loop, its complete crap. Just need to wrap my head around that code..