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authorTejun Heo <tj@kernel.org>2015-08-18 14:55:18 -0700
committerJens Axboe <axboe@fb.com>2015-08-18 15:49:17 -0700
commit85b6bc9db6d5ab6980b43c38b5cbd11d24414ce4 (patch)
tree7389d8656738b72cc7c8c7569247db31800d9246 /block/blk-throttle.c
parent24f290466f79a6497f1654f64b9a841872cba3ca (diff)
downloadlinux-85b6bc9db6d5ab6980b43c38b5cbd11d24414ce4.tar.bz2
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.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index c2c75477a6b2..1f63fc834dc3 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));
}