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

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Date:	Fri, 27 Mar 2015 20:44:59 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Roger Pau Monné <roger.pau@...rix.com>
Cc:	Bob Liu <bob.liu@...cle.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 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.

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