Ceph » RADOS

With Sam's soon-to-be-merged patch adding a RWTracker, we are ordering operations more strictly than is necessary. In particular, if we wanted to become more efficient, we could let through all reads whose clients do not have a prior write whenever we let through a single read. This would let us satisfy reads more quickly and get them out of the queue for any writes in progress to also go through all at once, reducing the number of times the backing filesystem needs to update the data on disk (by keeping the updates closer together) and generally letting us pipeline more than we could before.