Re: [Xen-devel] [RFC PATCH 2/2] gnttab: refactor locking for better scalability

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

On Tue, Nov 12, 2013 at 7:04 AM, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> On 12/11/13 14:52, Konrad Rzeszutek Wilk wrote:
>>> I should also mention that some of the improvement I mentioned from
>>> 3,000 MB/s to 3,600 MB/s was due to avoiding the m2p override spinlock
>>> in dom0.
>>
>> Could you post said patch please? I presume its pretty simple but
>> I would like the credit to go to you guys.
>
> Roger already posted it.
>
> https://lkml.org/lkml/2013/11/5/121
>
> I think we're just waiting for a repost with a more detailed commit message.

Roger's patch isn't correct.  It doesn't actually restore the previous
mfn because it's storing the new mfn in page private not the old one.

I have a patch that I'll post this afternoon.

Regards,

Anthony Liguori

> David
>
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