linux-kernel - [PATCH 0/4] block: account io: kill atomic operations

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Message-Id: <1437016607-375-1-git-send-email-tom.leiming@gmail.com>
Date:	Thu, 16 Jul 2015 11:16:43 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc:	Mike Snitzer <snitzer@...hat.com>, Tejun Heo <tj@...nel.org>
Subject: [PATCH 0/4] block: account io: kill atomic operations

Hi,

This patches kills two kinds of atomic operations in block
accounting I/O.

The 1st two patches convert atomic refcount of partition
into percpu refcount.

The 2nd two patches converts partition->in_flight[] into percpu
variable.

With this change, ~15% throughput improvement can be observed
when running fio(randread) over null blk in a dual-socket
environment.

 block/bio.c               |  4 ++--
 block/blk-core.c          |  5 ++--
 block/blk-merge.c         |  2 +-
 block/genhd.c             |  9 ++++---
 block/partition-generic.c | 17 ++++++-------
 drivers/md/dm.c           | 10 ++++----
 drivers/nvdimm/core.c     |  4 ++--
 include/linux/genhd.h     | 61 +++++++++++++++++++++++++++++++++--------------
 8 files changed, 72 insertions(+), 40 deletions(-)

Thanks,
Ming

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