linux-kernel - [tip: sched/core] sched/fair: Update comments in enqueue/dequeue

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Message-ID: <166124685390.401.5685584934311093072.tip-bot2@tip-bot2>
Date:   Tue, 23 Aug 2022 09:27:33 -0000
From:   "tip-bot2 for Chengming Zhou" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Chengming Zhou <zhouchengming@...edance.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Update comments in enqueue/dequeue_entity()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     859f206290f345c151a6005de639ba9677bf3e18
Gitweb:        https://git.kernel.org/tip/859f206290f345c151a6005de639ba9677bf3e18
Author:        Chengming Zhou <zhouchengming@...edance.com>
AuthorDate:    Thu, 18 Aug 2022 20:48:00 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 23 Aug 2022 11:01:18 +02:00

sched/fair: Update comments in enqueue/dequeue_entity()

When reading the sched_avg related code, I found the comments in
enqueue/dequeue_entity() are not updated with the current code.

We don't add/subtract entity's runnable_avg from cfs_rq->runnable_avg
during enqueue/dequeue_entity(), those are done only for attach/detach.

This patch updates the comments to reflect the current code working.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>
Link: https://lore.kernel.org/r/20220818124805.601-5-zhouchengming@bytedance.com
---
 kernel/sched/fair.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e4c0929..52de830 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4434,7 +4434,8 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	/*
 	 * When enqueuing a sched_entity, we must:
 	 *   - Update loads to have both entity and cfs_rq synced with now.
-	 *   - Add its load to cfs_rq->runnable_avg
+	 *   - For group_entity, update its runnable_weight to reflect the new
+	 *     h_nr_running of its group cfs_rq.
 	 *   - For group_entity, update its weight to reflect the new share of
 	 *     its group cfs_rq
 	 *   - Add its new weight to cfs_rq->load.weight
@@ -4519,7 +4520,8 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	/*
 	 * When dequeuing a sched_entity, we must:
 	 *   - Update loads to have both entity and cfs_rq synced with now.
-	 *   - Subtract its load from the cfs_rq->runnable_avg.
+	 *   - For group_entity, update its runnable_weight to reflect the new
+	 *     h_nr_running of its group cfs_rq.
 	 *   - Subtract its previous weight from cfs_rq->load.weight.
 	 *   - For group entity, update its weight to reflect the new share
 	 *     of its group cfs_rq.