linux-kernel - [PATCH 7/8] bfq: reset entity->prio_changed in bfq_init

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Message-Id: <34c02f3525ed632ea1878591b41174aee50e953d.1618916839.git.brookxu@tencent.com>
Date:   Tue, 20 Apr 2021 19:20:24 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     paolo.valente@...aro.org, axboe@...nel.dk, tj@...nel.org
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/8] bfq: reset entity->prio_changed in bfq_init_entity()

From: Chunguang Xu <brookxu@...cent.com>

Since weight, ioprio, ioprio_class will be updated in bfq_init_entity(),
st->wsum will be updated in __bfq_activate_entity(), so when it is first
active, it seems that __bfq_entity_update_weight_prio() has nothing to
do. By resetting entity->prio_change in bfq_init_entity(), we can avoid
unnecessary logic calls.

Signed-off-by: Chunguang Xu <brookxu@...cent.com>
---
 block/bfq-cgroup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index c8c68dc..79a5aaa 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -426,6 +426,7 @@ void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg)
 
 	entity->weight = entity->new_weight;
 	entity->orig_weight = entity->new_weight;
+	entity->prio_changed = 0;
 	if (bfqq) {
 		bfqq->ioprio = bfqq->new_ioprio;
 		bfqq->ioprio_class = bfqq->new_ioprio_class;
-- 
1.8.3.1