Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932233AbVKKKqL (ORCPT ); Fri, 11 Nov 2005 05:46:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932368AbVKKKqK (ORCPT ); Fri, 11 Nov 2005 05:46:10 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:24762 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S932233AbVKKKqJ (ORCPT ); Fri, 11 Nov 2005 05:46:09 -0500 Date: Fri, 11 Nov 2005 11:46:16 +0100 From: Ingo Molnar To: Christoph Hellwig , Christoph Lameter , Andrew Morton , hugh@veritas.com, linux-kernel@vger.kernel.org, torvalds@osdl.org Subject: Re: [PATCH 01/15] mm: poison struct page for ptlock Message-ID: <20051111104616.GA24238@elte.hu> References: <20051109181022.71c347d4.akpm@osdl.org> <20051109185645.39329151.akpm@osdl.org> <20051110120624.GB32672@elte.hu> <20051110042613.7a585dec.akpm@osdl.org> <20051110215255.GA25712@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051110215255.GA25712@infradead.org> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=disabled SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1037 Lines: 26 * Christoph Hellwig wrote: > On Thu, Nov 10, 2005 at 01:37:19PM -0800, Christoph Lameter wrote: > > On Thu, 10 Nov 2005, Andrew Morton wrote: > > > > > spinlock in struct page, and the size of the spinlock varies a lot according > > > to config. The only >wordsize version we really care about is > > > CONFIG_PREEMPT, NR_CPUS >= 4. (which distros don't ship...) > > > > Suse, Debian and Redhat ship such kernels. > > No. SuSE and Redhat have always been smart enough to avoid > CONFIG_PREEMPT like the plague, and even Debian finally noticed this a > few month ago. while you are right about CONFIG_PREEMPT, there is some movement in this area: CONFIG_PREEMPT_VOLUNTARY is now turned on in Fedora kernels, and PREEMPT_BKL is turned on for SMP kernels. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/