The 'mq' policy is no longer the default policy, and the default policy,
'smq', does not store hit counts.
Signed-off-by: mulhern <amulhern@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
dirty flags this data is lost if there's a crash so a safe fallback
value should always be possible.
-For instance, the 'mq' policy, which is currently the default policy,
-uses this facility to store the hit count of the cache blocks. If
-there's a crash this information will be lost, which means the cache
-may be less efficient until those hit counts are regenerated.
-
Policy hints affect performance, not correctness.
Policy messaging