block: partition: convert percpu ref

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Percpu refcount is the perfect match for partition's case,
and the conversion is quite straight.

With the convertion, one pair of atomic inc/dec can be saved
for accounting block I/O, which is run in hot path of block I/O.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

...

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Ming Lei 2015-07-16 11:16:45 +08:00 • committed by Jens Axboe

parent b54e5ed8f2

commit 6c71013ecb

3 changed files with 27 additions and 15 deletions

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27

include/linux/genhd.h

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