Re: [PATCH v2] xen-bus: reduce scope of backend watch

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Thu, Oct 01, 2020 at 09:15:00AM +0100, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> Currently a single watch on /local/domain/X/backend is registered by each
> QEMU process running in service domain X (where X is usually 0). The purpose
> of this watch is to ensure that QEMU is notified when the Xen toolstack
> creates a new device backend area.
> Such a backend area is specific to a single frontend area created for a
> specific guest domain and, since each QEMU process is also created to service
> a specfic guest domain, it is unnecessary and inefficient to notify all QEMU
> processes.
> Only the QEMU process associated with the same guest domain need
> receive the notification. This patch re-factors the watch registration code
> such that notifications are targetted appropriately.
> 
> Reported-by: Jerome Leseinne <jerome.leseinne@xxxxxxxxx>
> Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>

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

Thanks,

-- 
Anthony PERARD