linux-kernel - Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not be subject to NUMA balancing

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Message-ID: <565745DF.8030008@citrix.com>
Date:	Thu, 26 Nov 2015 17:48:15 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<konrad.wilk@...cle.com>, <david.vrabel@...rix.com>
CC:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	<xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not
 be subject to NUMA balancing

On 10/11/15 20:10, Boris Ostrovsky wrote:
> Doing so will cause the grant to be unmapped and then, during
> fault handling, the fault to be mistakenly treated as NUMA hint
> fault.
> 
> In addition, even if those maps could partcipate in NUMA
> balancing, it wouldn't provide any benefit since we are unable
> to determine physical page's node (even if/when VNUMA is
> implemented).
> 
> Marking grant maps' VMAs as VM_IO will exclude them from being
> part of NUMA balancing.

Applied to for-linus-4.4, thanks.

David
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