Date: Tue, 8 Apr 2014 12:02:50 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Steven Noonan <steven@uplinklabs.net>, Mel Gorman <mgorman@suse.de>,
        Cyrill Gorcunov <gorcunov@gmail.com>,
        David Vrabel <david.vrabel@citrix.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>, Rik van Riel <riel@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrea Arcangeli <aarcange@redhat.com>, Linux-MM <linux-mm@kvack.org>,
        Linux-X86 <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address
 bits PMD and PTE levels
Message-ID: <20140408160250.GE31554@phenom.dumpdata.com>
References: <5342C517.2020305@citrix.com>
 <20140407154935.GD7292@suse.de>
 <20140407161910.GJ1444@moon>
 <20140407182854.GH7292@suse.de>
 <5342FC0E.9080701@zytor.com>
 <20140407193646.GC23983@moon>
 <5342FFB0.6010501@zytor.com>
 <20140407212535.GJ7292@suse.de>
 <CAKbGBLhsWKVYnBqR0ZJ2kfaF_h=XAYkjq=v3RLoRBDkF_w=6ag@mail.gmail.com>
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.snip..
> >>> David Vrabel has a patchset which I presumed would be pulled through
> >the
> >>> Xen tree this merge window:
> >>>
> >>> [PATCHv5 0/8] x86/xen: fixes for mapping high MMIO regions (and
> >remove
> >>> _PAGE_IOMAP)
> >>>
> >>> That frees up this bit.
> >>>
> >>
> >> Thanks, I was not aware of that patch.  Based on it, I intend to
> >force
> >> automatic NUMA balancing to depend on !XEN and see what the reaction
> >is. If
> >> support for Xen is really required then it potentially be re-enabled
> >if/when
> >> that series is merged assuming they do not need the bit for something
> >else.
> >>
> >
> >Amazon EC2 does have large memory instance types with NUMA exposed to
> >the guest (e.g. c3.8xlarge, i2.8xlarge, etc), so it'd be preferable
> >(to me anyway) if we didn't require !XEN.

What about the patch that David Vrabel posted:

http://osdir.com/ml/general/2014-03/msg41979.html

Has anybody taken it for a spin?
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