linux-kernel - [PATCH 0/7] Adjust hybrid polling sleep time

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Date:   Tue, 30 Apr 2019 10:34:12 +0300
From:   "Pavel Begunkov (Silence)" <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH 0/7] Adjust hybrid polling sleep time

From: Pavel Begunkov <asml.silence@...il.com>

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(-)

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2.21.0