[PATCH 0/7] Adjust hybrid polling sleep time

[Pavel Begunkov (Silence)]

From: Pavel Begunkov <asml.silence@xxxxxxxxx>

Sleep time for adaptive hybrid polling is coarse and can be improved to
decrease CPU load. Use variation of the 3-sigma rule and runtime
tuning.

This approach gives up to 2x CPU load reduction keeping the same latency
distribution and throughput.

Pavel Begunkov (7):
  blk-iolatency: Fix zero mean in previous stats
  blk-stats: Introduce explicit stat staging buffers
  blk-mq: Fix disabled hybrid polling
  blk-stats: Add left mean deviation to blk_stats
  blk-mq: Precalculate hybrid polling time
  blk-mq: Track num of overslept by hybrid poll rqs
  blk-mq: Adjust hybrid poll sleep time

 block/blk-core.c          |   7 +-
 block/blk-iolatency.c     |  60 ++++++++++----
 block/blk-mq-debugfs.c    |  14 ++--
 block/blk-mq.c            | 163 ++++++++++++++++++++++++++++----------
 block/blk-stat.c          |  67 +++++++++++++---
 block/blk-stat.h          |  15 +++-
 include/linux/blk_types.h |   9 +++
 include/linux/blkdev.h    |  17 +++-
 8 files changed, 271 insertions(+), 81 deletions(-)

-- 
2.21.0