linux-kernel - Re: [PATCH 2/2] xen/grant: introduce func gnttab_unmap_refs_async_wait

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Message-ID: <551892EC.6030209@oracle.com>
Date:	Mon, 30 Mar 2015 08:03:56 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Roger Pau Monné <roger.pau@...rix.com>,
	xen-devel@...ts.xenproject.org, boris.ostrovsky@...cle.com,
	jennifer.herbert@...rix.com, david.vrabel@...rix.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] xen/grant: introduce func gnttab_unmap_refs_async_wait_completion()


On 03/28/2015 08:44 AM, Konrad Rzeszutek Wilk wrote:
> On Thu, Mar 26, 2015 at 04:32:45PM +0100, Roger Pau Monné wrote:
>> El 26/03/15 a les 13.16, Bob Liu ha escrit:
>>> There are several place using gnttab async unmap and wait for
>>> completion, so move the common code to a function
>>> gnttab_unmap_refs_async_wait_completion().
>>>
>>> Signed-off-by: Bob Liu <bob.liu@...cle.com>
>>
>> For the blkback parts:
>>
>> Acked-by: Roger Pau Monné <roger.pau@...rix.com>
>>
>> Although, as David already said, I think we should do better than BUG_ON
>> on error.
> 

This patch only keeps the existing behaviour the same as before. I
prefer to make new patches(based on this one) if want to change the
behaviour.

> Have an 'stuck deferred pages' list and an timer to occasionally
> flush them out? Something similar to 569ca5b3f94cd0b3295ec5943aa457cf4a4f6a3a
> "xen/gnttab: add deferred freeing logic" ?

Sounds like a good idea.

-- 
Regards,
-Bob
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