ceph/ceph — pull request #668 by liewegas (2013-10-01 16:27:54+00:00)
Title: osdc/ObjectCacher: limit writeback IOs generated while holding lock

While analyzing a log from Mike Dawson I saw a long stall while librbd's
objectcacher was starting lots (many hundreds) of IOs. Limit the amount of
time we spend doing this at a time to allow IO replies to be processed so
that the cache remains responsive.

Signed-off-by: Sage Weil