xen/blkback: don't keep persistent grants too long
Persistent grants are allocated until a threshold per ring is being reached. Those grants won't be freed until the ring is being destroyed meaning there will be resources kept busy which might no longer be used. Instead of freeing only persistent grants until the threshold is reached add a timestamp and remove all persistent grants not having been in use for a minute. Signed-off-by:Juergen Gross <jgross@suse.com> Reviewed-by:
Roger Pau Monné <roger.pau@citrix.com> Signed-off-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent
b86d865c
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