From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932369AbaDHQGa (ORCPT ); Tue, 8 Apr 2014 12:06:30 -0400 Received: from terminus.zytor.com ([198.137.202.10]:33115 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756329AbaDHQG1 (ORCPT ); Tue, 8 Apr 2014 12:06:27 -0400 Message-ID: <53441E19.8090004@zytor.com> Date: Tue, 08 Apr 2014 09:04:41 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Linus Torvalds CC: Mel Gorman , Linux-X86 , Cyrill Gorcunov , Ingo Molnar , Steven Noonan , Rik van Riel , David Vrabel , Andrew Morton , Peter Zijlstra , Andrea Arcangeli , Dave Hansen , Srikar Dronamraju , Linux-MM , LKML Subject: Re: [RFC PATCH 0/5] Use an alternative to _PAGE_PROTNONE for _PAGE_NUMA v2 References: <1396962570-18762-1-git-send-email-mgorman@suse.de> <53440A5D.6050301@zytor.com> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/08/2014 08:22 AM, Linus Torvalds wrote: > On Tue, Apr 8, 2014 at 7:40 AM, H. Peter Anvin wrote: >> >> David, is your patchset going to be pushed in this merge window as expected? > > Apparently aiming for 3.16 right now. > >> That being said, these bits are precious, and if this ends up being a >> case where "only Xen needs another bit" once again then Xen should >> expect to get kicked to the curb at a moment's notice. > > Quite frankly, I don't think it's a Xen-only issue. The code was hard > to figure out even without the Xen issues. For example, nobody ever > explained to me why it > > (a) could be the same as PROTNONE on x86 > (b) could not be the same as PROTNONE in general > > I think the best explanation for it so far was from the little voices > in my head that sang "It's a kind of Magic", and that isn't even > remotely the best song by Queen. > Yes, I was hoping that the timing would work out so we could evict bit 10 (which *is* a Xen-only issue) and then reuse it. I don't think the NUMA bit is Xen-only. -hpa