diff options
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index ee342826fd98..e8f31069b379 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -606,20 +606,11 @@ static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg) return pd_to_cfqg(blkg_to_pd(blkg, &blkcg_policy_cfq)); } -/* - * Determine the parent cfqg for weight calculation. Currently, cfqg - * scheduling is flat and the root is the parent of everyone else. - */ -static inline struct cfq_group *cfqg_flat_parent(struct cfq_group *cfqg) +static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) { - struct blkcg_gq *blkg = cfqg_to_blkg(cfqg); - struct cfq_group *root; - - while (blkg->parent) - blkg = blkg->parent; - root = blkg_to_cfqg(blkg); + struct blkcg_gq *pblkg = cfqg_to_blkg(cfqg)->parent; - return root != cfqg ? root : NULL; + return pblkg ? blkg_to_cfqg(pblkg) : NULL; } static inline void cfqg_get(struct cfq_group *cfqg) @@ -722,7 +713,7 @@ static void cfq_pd_reset_stats(struct blkcg_gq *blkg) #else /* CONFIG_CFQ_GROUP_IOSCHED */ -static inline struct cfq_group *cfqg_flat_parent(struct cfq_group *cfqg) { return NULL; } +static inline struct cfq_group *cfqg_parent(struct cfq_group *cfqg) { return NULL; } static inline void cfqg_get(struct cfq_group *cfqg) { } static inline void cfqg_put(struct cfq_group *cfqg) { } @@ -1290,7 +1281,7 @@ cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg) * stops once an already activated node is met. vfraction * calculation should always continue to the root. */ - while ((parent = cfqg_flat_parent(pos))) { + while ((parent = cfqg_parent(pos))) { if (propagate) { propagate = !parent->nr_active++; parent->children_weight += pos->weight; @@ -1341,7 +1332,7 @@ cfq_group_service_tree_del(struct cfq_rb_root *st, struct cfq_group *cfqg) pos->children_weight -= pos->leaf_weight; while (propagate) { - struct cfq_group *parent = cfqg_flat_parent(pos); + struct cfq_group *parent = cfqg_parent(pos); /* @pos has 0 nr_active at this point */ WARN_ON_ONCE(pos->children_weight); |