Commits on Aug 18, 2016

1. os/bluestore: add multiple finishers to bluestore …

   - The single finisher of a bluestore can be a bottleneck
   when using an SSD as a backend device. If too much load
   is given to the single finisher, client-side IO latency
   increases. So we add multiple finishers to the
   bluestore, which shows better performance.
   
   - 'bluestore_shard_finishers' option is added to
   be able to configure wheather finsihers is multiple or
   not.
   
   - a finisher is selected according to the shard id of a
   sequencer.
   
   - the number of finishers is decided by
   osd_op_num_shards.
   
   Signed-off-by: Ilsoo Byun <ilsoo.byun@sk.com>

   

   IlsooByun authored and liewegas committed Aug 18, 2016
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