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

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


             reply	other threads:[~2015-07-16  3:19 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-16  3:16 Ming Lei [this message]
2015-07-16  3:16 ` [PATCH 1/4] block: partition: introduce hd_free_part() Ming Lei
2015-07-16  3:16 ` [PATCH 2/4] block: partition: convert percpu ref Ming Lei
2015-07-16 14:36   ` Tejun Heo
2015-07-16  3:16 ` [PATCH 3/4] block: partition: introduce 'cpu' para to part_inc|dec_in_flight Ming Lei
2015-07-16  3:16 ` [PATCH 4/4] block: account io: convert part->in_fligh[] into percpu variable Ming Lei
2015-07-16 14:40   ` Tejun Heo
2015-07-16 14:48 ` [PATCH 0/4] block: account io: kill atomic operations Jens Axboe
2015-07-16 14:59   ` Tejun Heo
2015-07-16 15:02     ` Jens Axboe
2015-07-16 15:01   ` Ming Lei
2015-07-16 15:09     ` Jens Axboe

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