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author | Tejun Heo <tj@kernel.org> | 2015-08-18 14:55:22 -0700 |
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committer | Jens Axboe <axboe@fb.com> | 2015-08-18 15:49:17 -0700 |
commit | 24bdb8ef068ebdc2a57ce715f0ab22d5da32832a (patch) | |
tree | 466def9b935d1a40ce63cd07607e4a7be551f6bd /fs | |
parent | e6269c44546755094979ab53609e6e203a68c8ff (diff) | |
download | linux-24bdb8ef068ebdc2a57ce715f0ab22d5da32832a.tar.bz2 |
blkcg: make blkcg_[rw]stat per-cpu
blkcg_[rw]stat are used as stat counters for blkcg policies. It isn't
per-cpu by itself and blk-throttle makes it per-cpu by wrapping around
it. This patch makes blkcg_[rw]stat per-cpu and drop the ad-hoc
per-cpu wrapping in blk-throttle.
* blkg_[rw]stat->cnt is replaced with cpu_cnt which is struct
percpu_counter. This makes syncp unnecessary as remote accesses are
handled by percpu_counter itself.
* blkg_[rw]stat_init() can now fail due to percpu allocation failure
and thus are updated to return int.
* percpu_counters need explicit freeing. blkg_[rw]stat_exit() added.
* As blkg_rwstat->cpu_cnt[] can't be read directly anymore, reading
and summing results are stored in ->aux_cnt[] instead.
* Custom per-cpu stat implementation in blk-throttle is removed.
This makes all blkcg stat counters per-cpu without complicating policy
implmentations.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions