linux-kernel - Re: [PATCH] Subject: [PATCH] xen: Properly account for _PAGE

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Date:	Tue, 4 Feb 2014 11:48:45 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Ingo Molnar <mingo@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Steven Noonan <steven@...inklabs.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	George Dunlap <george.dunlap@...citrix.com>,
	Dario Faggioli <dario.faggioli@...rix.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Elena Ufimtseva <ufimtseva@...il.com>,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, Linux-X86 <x86@...nel.org>,
	xen-devel <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH] Subject: [PATCH] xen: Properly account for _PAGE_NUMA
 during xen pte translations

On 04/02/14 11:44, Mel Gorman wrote:
> Steven Noonan forwarded a users report where they had a problem starting
> vsftpd on a Xen paravirtualized guest, with this in dmesg:
> 
[...]
> 
> The issue could not be reproduced under an HVM instance with the same kernel,
> so it appears to be exclusive to paravirtual Xen guests. He bisected the
> problem to commit 1667918b (mm: numa: clear numa hinting information on
> mprotect) that was also included in 3.12-stable.
> 
> The problem was related to how xen translates ptes because it was not
> accounting for the _PAGE_NUMA bit. This patch splits pte_present to add
> a pteval_present helper for use by xen so both bare metal and xen use
> the same code when checking if a PTE is present.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

Thanks.

David
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