From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761485AbYDUOab (ORCPT ); Mon, 21 Apr 2008 10:30:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758814AbYDUOaW (ORCPT ); Mon, 21 Apr 2008 10:30:22 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:59593 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755790AbYDUOaW (ORCPT ); Mon, 21 Apr 2008 10:30:22 -0400 Date: Mon, 21 Apr 2008 16:29:48 +0200 From: Ingo Molnar To: Andrew Morton Cc: Arjan van de Ven , andi@firstfloor.org, joern@logfs.org, w@1wt.eu, lkml@rtr.ca, bunk@kernel.org, alan@lxorguk.ukuu.org.uk, shawn.bohrer@gmail.com, linux-kernel@vger.kernel.org, tglx@linutronix.de Subject: Re: x86: 4kstacks default Message-ID: <20080421142948.GV9554@elte.hu> References: <20080420124717.GH8474@1wt.eu> <480B44C4.4060104@rtr.ca> <20080420133857.GB26536@1wt.eu> <480B50F1.8040309@firstfloor.org> <20080420164133.GB20694@logfs.org> <480B7B1E.7010707@firstfloor.org> <20080420174249.GC20694@logfs.org> <480B8932.1090308@firstfloor.org> <20080420115053.7151ef8d@laptopd505.fenrus.org> <20080420145020.217ecdd4.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080420145020.217ecdd4.akpm@linux-foundation.org> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Andrew Morton wrote: > > On Sun, 20 Apr 2008 11:50:53 -0700 Arjan van de Ven wrote: > > On Sun, 20 Apr 2008 20:19:30 +0200 > > Andi Kleen wrote: > > > > > In theory if you e.g. convert a recursive algorithm > > > to iterative you might save some cache foot print, but I don't > > > think that really happens in kernel code. > > > > > > > this is what Al did for the symlink recursion thing, and Jens did > > for the block layer... so yes this conversion does happen for real. > > md got mostly-fixed too, via Neil's patch which sat in -mm for nearly > two years. had we done the de-obfuscate-4K-stacks Kconfig change earlier it might have gotten upstream faster. Ingo