tree 4cd9da2b11616ee1a38bb1ac677ca7ec90bef2b7
parent 624d0f1dd7c80d2bac4fc3066b2ff3947f890883
author Jan Kara <jack@suse.cz> 1416934524 -0500
committer Theodore Ts'o <tytso@mit.edu> 1416934524 -0500

ext4: introduce aging to extent status tree

Introduce a simple aging to extent status tree. Each extent has a
REFERENCED bit which gets set when the extent is used. Shrinker then
skips entries with referenced bit set and clears the bit. Thus
frequently used extents have higher chances of staying in memory.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>