Re: [PATCH] Subject: [PATCH] xen: Properly account for _PAGE_NUMAduring xen pte translations

[Konrad Rzeszutek Wilk]

On Tue, Feb 04, 2014 at 11:48:45AM +0000, David Vrabel wrote:
> 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@xxxxxxxxxx>

Thank you for fixing it!

Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

I can ingest it through the Xen tree for rc2. Or let Linus handle it
if he prefers it.

> 
> Thanks.
> 
> David
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