From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964987AbWFTJMq (ORCPT ); Tue, 20 Jun 2006 05:12:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965085AbWFTJMq (ORCPT ); Tue, 20 Jun 2006 05:12:46 -0400 Received: from omx1-ext.sgi.com ([192.48.179.11]:26062 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S964987AbWFTJMp (ORCPT ); Tue, 20 Jun 2006 05:12:45 -0400 Message-ID: <4497BBFE.6000703@sgi.com> Date: Tue, 20 Jun 2006 11:12:30 +0200 From: Jes Sorensen User-Agent: Thunderbird 1.5 (X11/20060317) MIME-Version: 1.0 To: Andi Kleen CC: Robin Holt , linux-kernel@vger.kernel.org, Nick Piggin , Hugh Dickins , Carsten Otte , bjorn_helgaas@hp.com Subject: Re: [patch] do_no_pfn References: <200606201013.10353.ak@suse.de> <4497B490.90303@sgi.com> <200606201048.10545.ak@suse.de> In-Reply-To: <200606201048.10545.ak@suse.de> X-Enigmail-Version: 0.94.0.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen wrote: >> Please go back and read the old threads on this for all the details, >> I would miss half the points if I was to try and restate it all from >> memory. > > Shouldn't these points be in the patch submission description? You expect people to go look for things on random mailing lists when you post it, but you don't care to search the archives yourself.... och well. http://www.gelato.unsw.edu.au/archives/linux-ia64/0603/index.html#17543 http://www.ussg.iu.edu/hypermail/linux/kernel/0604.2/index.html#0652 http://www.ussg.iu.edu/hypermail/linux/kernel/0604.3/index.html#0029 >> Doing this at mmap time does not work, you want NUMA node locality. >> It has to be done through first touch mappings. > > Then create struct page *s. One struct page for a random single page here, another for a single random page there. And the risk that someone will start walking the pages and dereference and cause data corruption. As explained before, it's a bad idea. Jes