Zach Brown 736d5765fc Add a shrinker for the segment cache
After segments have finished IO and while they're in the rbtree we track
them with an LRU.  Under memory pressure we can remove the oldest
segments from the rbtree and free them.

Signed-off-by: Zach Brown <zab@versity.com>
2017-04-18 13:44:54 -07:00
2017-04-18 13:44:54 -07:00
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