tree 773a3ebe4289815e677ce2b357c665cba5292c0e
parent b54e5ed8f285d62c0d242c4ef9da90937994db02
author Ming Lei <tom.leiming@gmail.com> 1437016605 +0800
committer Jens Axboe <axboe@fb.com> 1437144113 -0600

block: partition: convert percpu ref

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>