• Jan Kara's avatar
    mbcache2: limit cache size · c2f3140f
    Jan Kara authored
    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: default avatarJan Kara <jack@suse.cz>
    Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    c2f3140f
mbcache2.c 11.3 KB