xen-blkback: print stats about persistent grants
xen-blkback: print stats about persistent grants

Signed-off-by: Roger Pau Monné <1c35b25b17252e1e5021df00666589fc74f64580@citrix.com>
Cc: 196a79ea1bad81d8c954adf793448b0a45442f28@lists.xen.org
Cc: Konrad Rzeszutek Wilk <da3a51b335cef0eb0e2c329c5ef6bcd6acef687a@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <da3a51b335cef0eb0e2c329c5ef6bcd6acef687a@oracle.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs