linux-kernel - Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address bits PMD and PTE levels

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Message-ID: <20140408164744.GM7292@suse.de>
Date:	Tue, 8 Apr 2014 17:47:44 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Steven Noonan <steven@...inklabs.net>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linux-MM <linux-mm@...ck.org>, Linux-X86 <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH 2/3] x86: Define _PAGE_NUMA with unused physical address
 bits PMD and PTE levels

On Tue, Apr 08, 2014 at 09:16:49AM -0700, H. Peter Anvin wrote:
> 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.
> 

I posted an alternative to that patch that confines the damage to the
NUMA pte helpers.

-- 
Mel Gorman
SUSE Labs
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