From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f177.google.com (mail-ie0-f177.google.com [209.85.223.177]) by kanga.kvack.org (Postfix) with ESMTP id E01C36B0037 for ; Tue, 8 Apr 2014 12:12:16 -0400 (EDT) Received: by mail-ie0-f177.google.com with SMTP id rl12so1138153iec.22 for ; Tue, 08 Apr 2014 09:12:16 -0700 (PDT) Received: from merlin.infradead.org (merlin.infradead.org. [2001:4978:20e::2]) by mx.google.com with ESMTPS id ks1si3994455igb.3.2014.04.08.09.12.16 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Apr 2014 09:12:16 -0700 (PDT) Date: Tue, 8 Apr 2014 18:12:03 +0200 From: Peter Zijlstra Subject: Re: [RFC PATCH 0/5] Use an alternative to _PAGE_PROTNONE for _PAGE_NUMA v2 Message-ID: <20140408161203.GQ10526@twins.programming.kicks-ass.net> References: <1396962570-18762-1-git-send-email-mgorman@suse.de> <53440A5D.6050301@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds Cc: "H. Peter Anvin" , Mel Gorman , Linux-X86 , Cyrill Gorcunov , Ingo Molnar , Steven Noonan , Rik van Riel , David Vrabel , Andrew Morton , Andrea Arcangeli , Dave Hansen , Srikar Dronamraju , Linux-MM , LKML On Tue, Apr 08, 2014 at 08:22:15AM -0700, 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. Right; so initially when I started doing the numa scanning thing I implemented b. I've never quite understood why that wasn't chosen; but since Mel already got the PAGE_NUMA bits merged by the time I re-surfaced, I didn't want to argue too much about it. -- 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