Re: [Xen-devel] [PATCH 3/3] xen-bus / xen-block: add support for event channel polling

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Mon, Apr 08, 2019 at 04:16:17PM +0100, Paul Durrant wrote:
> This patch introduces a poll callback for event channel fd-s and uses
> this to invoke the channel callback function.
> 
> To properly support polling, it is necessary for the event channel callback
> function to return a boolean saying whether it has done any useful work or
> not. Thus xen_block_dataplane_event() is modified to directly invoke
> xen_block_handle_requests() and the latter only returns true if it actually
> processes any requests. This also means that the call to qemu_bh_schedule()
> is moved into xen_block_complete_aio(), which is more intuitive since the
> only reason for doing a deferred poll of the shared ring should be because
> there were previously insufficient resources to fully complete a previous
> poll.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> ---

Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Thanks,

-- 
Anthony PERARD

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