[PATCH RFC 0/4] xen-block: prevent blkfront for hoarding grants

[Roger Pau Monne]

The following patches prevent blkfront from hoarding all grants in the 
system by allowing blkfront to request blkback to unmap certain grants 
so they can be freed by blkfront. This is done periodically by 
blkfront, unmapping a certain amount of unused persistent grants.

This series also includes a bug fix for the grant table free callback 
implementation.

According to my tests, this series don't introduce any performance 
regressions, results can be seen at:

http://xenbits.xen.org/people/royger/persistent_unmap/
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