From 89ed6c9ac69ec398ccb648f5f675b43e8ca679ca Mon Sep 17 00:00:00 2001 From: Xiu Jianfeng Date: Tue, 16 Jul 2024 13:30:58 +0000 Subject: [PATCH] blk-cgroup: move congestion_count to struct blkcg The congestion_count was introduced into the struct cgroup by commit d09d8df3a294 ("blkcg: add generic throttling mechanism"), but since it is closely related to the blkio subsys, it is not appropriate to put it in the struct cgroup, so let's move it to struct blkcg. There should be no functional changes because blkcg is per cgroup. Signed-off-by: Xiu Jianfeng Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20240716133058.3491350-1-xiujianfeng@huawei.com Signed-off-by: Jens Axboe --- block/blk-cgroup.c | 7 ++++--- block/blk-cgroup.h | 10 ++++++---- include/linux/cgroup-defs.h | 3 --- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 37e6cc91d576..69e70964398c 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -2182,12 +2182,13 @@ void blk_cgroup_bio_start(struct bio *bio) bool blk_cgroup_congested(void) { - struct cgroup_subsys_state *css; + struct blkcg *blkcg; bool ret = false; rcu_read_lock(); - for (css = blkcg_css(); css; css = css->parent) { - if (atomic_read(&css->cgroup->congestion_count)) { + for (blkcg = css_to_blkcg(blkcg_css()); blkcg; + blkcg = blkcg_parent(blkcg)) { + if (atomic_read(&blkcg->congestion_count)) { ret = true; break; } diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index bd472a30bc61..864fad4a850b 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -95,6 +95,8 @@ struct blkcg { struct cgroup_subsys_state css; spinlock_t lock; refcount_t online_pin; + /* If there is block congestion on this cgroup. */ + atomic_t congestion_count; struct radix_tree_root blkg_tree; struct blkcg_gq __rcu *blkg_hint; @@ -374,7 +376,7 @@ static inline void blkcg_use_delay(struct blkcg_gq *blkg) if (WARN_ON_ONCE(atomic_read(&blkg->use_delay) < 0)) return; if (atomic_add_return(1, &blkg->use_delay) == 1) - atomic_inc(&blkg->blkcg->css.cgroup->congestion_count); + atomic_inc(&blkg->blkcg->congestion_count); } static inline int blkcg_unuse_delay(struct blkcg_gq *blkg) @@ -399,7 +401,7 @@ static inline int blkcg_unuse_delay(struct blkcg_gq *blkg) if (old == 0) return 0; if (old == 1) - atomic_dec(&blkg->blkcg->css.cgroup->congestion_count); + atomic_dec(&blkg->blkcg->congestion_count); return 1; } @@ -418,7 +420,7 @@ static inline void blkcg_set_delay(struct blkcg_gq *blkg, u64 delay) /* We only want 1 person setting the congestion count for this blkg. */ if (!old && atomic_try_cmpxchg(&blkg->use_delay, &old, -1)) - atomic_inc(&blkg->blkcg->css.cgroup->congestion_count); + atomic_inc(&blkg->blkcg->congestion_count); atomic64_set(&blkg->delay_nsec, delay); } @@ -435,7 +437,7 @@ static inline void blkcg_clear_delay(struct blkcg_gq *blkg) /* We only want 1 person clearing the congestion count for this blkg. */ if (old && atomic_try_cmpxchg(&blkg->use_delay, &old, 0)) - atomic_dec(&blkg->blkcg->css.cgroup->congestion_count); + atomic_dec(&blkg->blkcg->congestion_count); } /** diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index ea48c861cd36..ec82c4b7ed4d 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -534,9 +534,6 @@ struct cgroup { /* used to store eBPF programs */ struct cgroup_bpf bpf; - /* If there is block congestion on this cgroup. */ - atomic_t congestion_count; - /* Used to store internal freezer state */ struct cgroup_freezer_state freezer;