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| author | Tejun Heo <tj@kernel.org> | 2015-08-18 14:55:18 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-08-18 15:49:17 -0700 |
| commit | 85b6bc9db6d5ab6980b43c38b5cbd11d24414ce4 (patch) | |
| tree | 7389d8656738b72cc7c8c7569247db31800d9246 /block/blk-throttle.c | |
| parent | 24f290466f79a6497f1654f64b9a841872cba3ca (diff) | |
| download | linux-0-day-85b6bc9db6d5ab6980b43c38b5cbd11d24414ce4.tar.gz linux-0-day-85b6bc9db6d5ab6980b43c38b5cbd11d24414ce4.tar.xz | |
blkcg: move root blkg lookup optimization from throtl_lookup_tg() to __blkg_lookup()
Currently, both throttle and cfq policies implement their own root
blkg (blkcg_gq) lookup fast path. This patch moves root blkg
optimization from throtl_lookup_tg() to __blkg_lookup(). cfq-iosched
currently doesn't use blkg_lookup() but will be converted and drop the
optimization too.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index c2c75477a6b20..1f63fc834dc3e 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -452,13 +452,6 @@ static void throtl_pd_reset_stats(struct blkg_policy_data *pd) static struct throtl_grp *throtl_lookup_tg(struct throtl_data *td, struct blkcg *blkcg) { - /* - * This is the common case when there are no blkcgs. Avoid lookup - * in this case - */ - if (blkcg == &blkcg_root) - return td_root_tg(td); - return blkg_to_tg(blkg_lookup(blkcg, td->queue)); } |