From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751346Ab0FWJLR (ORCPT ); Wed, 23 Jun 2010 05:11:17 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:57704 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750954Ab0FWJLQ convert rfc822-to-8bit (ORCPT ); Wed, 23 Jun 2010 05:11:16 -0400 Subject: Re: [PATCH RFC] reduce runqueue lock contention From: Peter Zijlstra To: Ingo Molnar Cc: Chris Mason , axboe@kernel.dk, linux-kernel@vger.kernel.org, Mike Galbraith , Oleg Nesterov , tglx In-Reply-To: <20100622211141.GC21149@elte.hu> References: <20100520204810.GA19188@think> <1277114522.1875.469.camel@laptop> <1277117647.1875.503.camel@laptop> <1277125479.1875.510.camel@laptop> <1277213586.1875.704.camel@laptop> <20100622211141.GC21149@elte.hu> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Wed, 23 Jun 2010 11:10:57 +0200 Message-ID: <1277284257.1875.820.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2010-06-22 at 23:11 +0200, Ingo Molnar wrote: > * Peter Zijlstra wrote: > > > So this one boots and builds a kernel on a dual-socket nehalem. > > > > there's still quite a number of XXXs to fix, but I don't think any of the > > races are crashing potential, mostly wrong accounting and scheduling iffies > > like. > > > > But give it a go.. see what it does for you (x86 only for now). > > > > Ingo, any comments other than, eew, scary? :-) > > None, other than a question: which future kernel do you aim it for? I'd prefer > v2.6.50 or later ;-) Well, assuming it all works out and actually reduces runqueue lock contention we still need to sort out all those XXXs in there, I'd say at the soonest somewhere near .38/.39 or so. Its definitely not something we should rush in.