Message-ID: <534420F1.3030301@zytor.com>
Date: Tue, 08 Apr 2014 09:16:49 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.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
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> <e9801da2-3aa4-4c23-9a64-90c890b9ebbc@email.android.com> <20140408160250.GE31554@phenom.dumpdata.com>
In-Reply-To: <20140408160250.GE31554@phenom.dumpdata.com>
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On 04/08/2014 09:02 AM, Konrad Rzeszutek Wilk wrote:
>>>
>>> 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?
> 

Oh lovely, more pvops in low level paths.  I'm so thrilled.

Incidentally, I wasn't even Cc:'d on that patch and was only added to
the thread by Linus, but never saw the early bits of the thread
including the actual patch.

	-hpa

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