tree 7389d8656738b72cc7c8c7569247db31800d9246
parent 24f290466f79a6497f1654f64b9a841872cba3ca
author Tejun Heo <tj@kernel.org> 1439934918 -0700
committer Jens Axboe <axboe@fb.com> 1439938157 -0700

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>