Commits on Aug 8, 2017

1. rbd: parallelize rbd ls -l …

   When a cluster contains a large number of images, "rbd ls -l" takes a
   long time to finish. In my particular case, it took about 58s to
   process 3000 images.
   "rbd ls -l" opens each of image and that takes majority of time, so
   improve this by using aio_open() and aio_close() to do it
   asynchronously. This reduced total processing time down to around 15
   seconds when using default 10 concurrently opened images.
   
   Signed-off-by: Piotr Dałek <piotr.dalek@corp.ovh.com>
   (cherry picked from commit 8f76fc8)

   

   branch-predictor authored and Jason Dillaman committed Aug 8, 2017
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