Zach Brown 295bf6b73b scoutfs: return free extents to server ...

Freed file data extents are tracked in free extent items in each node.
They could only be re-used in the future for file data extent allocation
on that node.  Allocations on other nodes or, critically, segment
allocation on the server could never see those free extents.  With the
right allocation patterns, particularly allocating on node X and freeing
on node Y, all the free extents can build up on a node and starve other
allocations.

This adds a simple high water mark after which nodes start returning
free extents to the server.  From there they can satisfy segment
allocations or be sent to other nodes for file data extent allocation.

Signed-off-by: Zach Brown <zab@versity.com>

2018-07-05 16:19:31 -07:00

kmod

scoutfs: return free extents to server

2018-07-05 16:19:31 -07:00

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