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

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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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[PATCH 0/4] block: account io: kill atomic operations Ming Lei <tom.leiming@gmail.com> - 2015-07-16 05:20 +0200
  [PATCH 3/4] block: partition: introduce 'cpu' para to part_inc|dec_in_flight Ming Lei <tom.leiming@gmail.com> - 2015-07-16 05:30 +0200
  [PATCH 1/4] block: partition: introduce hd_free_part() Ming Lei <tom.leiming@gmail.com> - 2015-07-16 05:30 +0200
  [PATCH 2/4] block: partition: convert percpu ref Ming Lei <tom.leiming@gmail.com> - 2015-07-16 05:30 +0200
    Re: [PATCH 2/4] block: partition: convert percpu ref Tejun Heo <tj@kernel.org> - 2015-07-16 16:40 +0200
  [PATCH 4/4] block: account io: convert part->in_fligh[] into percpu variable Ming Lei <tom.leiming@gmail.com> - 2015-07-16 05:30 +0200
    Re: [PATCH 4/4] block: account io: convert part->in_fligh[] into  percpu variable Tejun Heo <tj@kernel.org> - 2015-07-16 16:50 +0200
  Re: [PATCH 0/4] block: account io: kill atomic operations Jens Axboe <axboe@kernel.dk> - 2015-07-16 16:50 +0200
    Re: [PATCH 0/4] block: account io: kill atomic operations Tejun Heo <tj@kernel.org> - 2015-07-16 17:00 +0200
      Re: [PATCH 0/4] block: account io: kill atomic operations Jens Axboe <axboe@kernel.dk> - 2015-07-16 17:10 +0200
    Re: [PATCH 0/4] block: account io: kill atomic operations Jens Axboe <axboe@kernel.dk> - 2015-07-16 17:10 +0200
    Re: [PATCH 0/4] block: account io: kill atomic operations Ming Lei <tom.leiming@gmail.com> - 2015-07-16 17:10 +0200

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