linux-kernel - Re: [Xen-devel] [PATCH 1/2] Revert "xen: properly account for _PAGE

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Message-ID: <5331CB50.9000306@citrix.com>
Date:	Tue, 25 Mar 2014 18:30:40 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<mgorman@...e.de>, <akpm@...ux-foundation.org>,
	<steven@...inklabs.net>, <boris.ostrovsky@...cle.com>,
	David Sutton <kantras@...il.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/2] Revert "xen: properly account for _PAGE_NUMA
 during xen pte translations"

On 25/03/14 18:19, Konrad Rzeszutek Wilk wrote:
> 
> With that in mind I was wondering whether it would be possible to revert 
> Mel's 1667918b6483 ("mm: numa: clear numa hinting information on mprotect")
> so there is a bit more time in 3.15 to re-introduce his patch and also a
> proper fix so that Xen guests won't fall flat on their face?

Unfortunately, I think this can only be safely reverted on architectures
with ARCH_WANTS_PROT_NUMA_PROT_NONE (x86) and would cause regressions on
other architectures with only ARCH_SUPPORTS_NUMA_BALANCING (powerpc).

David
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