[PATCH 1/9] writeback: plug writeback at a high level

From: Dave Chinner Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially causes imeediate dispatch of IO for each mapping, regardless of the context in which writeback is occurring. IOWs, running a concurrent

[PATCH 1/9] writeback: plug writeback at a high level

From: Dave Chinner dchin...@redhat.com Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially causes imeediate dispatch of IO for each mapping, regardless of the context in which writeback is occurring. IOWs,