Re: [Xen-devel] [RFC PATCH 0/2] x86: fix Xen PV regression caused by NUMA page migration

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 21/03/14 18:18, David Vrabel wrote:
> This series should properly fix the Xen PV guest regression introduced
> by 1667918b6483 (mm: numa: clear numa hinting information on
> mprotect).  The previous fix a9c8e4beeeb6 (xen: properly account for
> _PAGE_NUMA during xen pte translations) breaks save/restore
> (migration) and needs to be reverted.
> 
> I've only given this series a minimal amount of testing and would
> appreciate testing by someone who experienced/reproduced the original
> regression.

Attached is a simple test program that triggers the bug.

Patch #2 fixes the regression and I think that it is the correct fix but
I need to confirm it doesn't cause any measurable performance problems
on native x86 (I think it should not).

I don't have any more time to work on this until next week.

David

Attachment: mprotect.c
Description: Text Data

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