linux-kernel - Re: [PATCH v2] xen/gntdev: Use mempolicy instead of VM

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Message-ID: <20161117112843.GA19761@aepfle.de>
Date:   Thu, 17 Nov 2016 12:28:44 +0100
From:   Olaf Hering <olaf@...fle.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     david.vrabel@...rix.com, jgross@...e.com,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] xen/gntdev: Use mempolicy instead of VM_IO flag to
 avoid NUMA balancing

On Wed, Nov 16, Boris Ostrovsky wrote:

> Unfortunately I haven't been able to trigger NUMA balancing
> so while I tested this in general I am not sure I actually
> exercised the code path.

Thanks for the patch!

Would be nice to actually test the code path which caused the initial
addition of VM_IO. I think I lack the hardware to excersise them.

In my 4.4 based sources I get the following unresolved symbols. If that
happens to work in mainline the failures should at least be considered
during backporting of this proposed patch to the stable trees.

ERROR: "__mpol_dup" [drivers/xen/xen-gntdev.ko] undefined!
ERROR: "get_task_policy" [drivers/xen/xen-gntdev.ko] undefined!

Appearently these symbols lack just an EXPORT_SYMBOL_GPL.

Olaf

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