blkcg: remove blkio_group->stats_lock

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With recent plug merge updates, all non-percpu stat updates happen
under queue_lock making stats_lock unnecessary to synchronize stat
updates.  The only synchronization necessary is stat reading, which
can be done using u64_stats_sync instead.

This patch removes blkio_group->stats_lock and adds
blkio_group_stats->syncp for reader synchronization.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Tejun Heo 2012-03-08 10:54:00 -08:00 • committed by Jens Axboe

parent c4c76a0538

commit edf1b879e3

2 changed files with 103 additions and 109 deletions

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209

block/blk-cgroup.c

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3

block/blk-cgroup.h

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