ceph/ceph — pull request #2820 by dillaman (2014-10-28 17:50:21+00:00)
Title: osdc: Constrain max number of in-flight read requests

The ObjectCacher now keeps track of the number of in-flight
read-request bytes. If the number of in-flight read-request
bytes surpasses the cache size, the read request will be
delayed until previous read requests finish. This prevents
the cache usage from ballooning in size during read-heavy ops
such as copy-up from a cloned image parent.

Fixes: 9854
Signed-off-by: Jason Dillaman