mbcache2: limit cache size
So far number of entries in mbcache is limited only by the pressure from the shrinker. Since too many entries degrade the hash table and generally we expect that caching more entries has diminishing returns, limit number of entries the same way as in the old mbcache to 16 * hash table size. Once we exceed the desired maximum number of entries, we schedule a backround work to reclaim entries. If the background work cannot keep up and the number of entries exceeds two times the desired maximum, we reclaim some entries directly when allocating a new entry. Signed-off-by:Jan Kara <jack@suse.cz> Signed-off-by:
Theodore Ts'o <tytso@mit.edu>
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