From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ee0-f51.google.com (mail-ee0-f51.google.com [74.125.83.51]) by kanga.kvack.org (Postfix) with ESMTP id D72D56B0037 for ; Tue, 8 Apr 2014 12:06:13 -0400 (EDT) Received: by mail-ee0-f51.google.com with SMTP id c13so859943eek.38 for ; Tue, 08 Apr 2014 09:06:11 -0700 (PDT) Received: from mail.zytor.com (terminus.zytor.com. [2001:1868:205::10]) by mx.google.com with ESMTPS id 45si3346796eeh.243.2014.04.08.09.06.09 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Apr 2014 09:06:10 -0700 (PDT) Message-ID: <53441E19.8090004@zytor.com> Date: Tue, 08 Apr 2014 09:04:41 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org