xen-blkfront: add a parameter for disabling of persistent grants
Persistent grants feature provides high scalability. On some small systems, however, it could incur data copy overheads[1] and thus it is required to be disabled. It can be disabled from blkback side using a module parameter, 'feature_persistent'. But, it is impossible from blkfront side. For the reason, this commit adds a blkfront module parameter for disabling of the feature. [1] https://wiki.xen.org/wiki/Xen_4.3_Block_Protocol_Scalability Signed-off-by:SeongJae Park <sjpark@amazon.de> Reviewed-by:
Juergen Gross <jgross@suse.com> Acked-by:
Roger Pau Monné <roger.pau@citrix.com> Link: https://lore.kernel.org/r/20200923061841.20531-3-sjpark@amazon.com Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com>
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