linux-kernel - [PATCH] sched/fair: updates weight of cfs_rq before update_cfs_group() in enqueue

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Date: Fri, 31 May 2024 11:08:33 +0800
From: pugaowei <pugaowei@...o.com>
To: mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	bristot@...hat.com,
	vschneid@...hat.com
Cc: linux-kernel@...r.kernel.org,
	pugaowei <pugaowei@...o.com>
Subject: [PATCH] sched/fair: updates weight of cfs_rq before update_cfs_group() in enqueue_entity()

we should update the weight of cfs_rq before update_cfs_group().
Ensure that we can get accurate shares of the cfs_rq when its
weights changes. we can find this work was done correctly in
dequeue_entity(). so fix it.

Signed-off-by: pugaowei <pugaowei@...o.com>
---
 kernel/sched/fair.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8a5b1ae0aa55..395840f3fa1d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5304,6 +5304,12 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	 */
 	update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH);
 	se_update_runnable(se);
+
+	/*
+	 * we should update the weight of cfs_rq before update_cfs_group.
+	 * Ensure we can get accurate shares of the cfs_rq when its weights changes.
+	 */
+	account_entity_enqueue(cfs_rq, se);
 	/*
 	 * XXX update_load_avg() above will have attached us to the pelt sum;
 	 * but update_cfs_group() here will re-adjust the weight and have to
@@ -5318,8 +5324,6 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	if (!curr)
 		place_entity(cfs_rq, se, flags);
 
-	account_entity_enqueue(cfs_rq, se);
-
 	/* Entity has migrated, no longer consider this task hot */
 	if (flags & ENQUEUE_MIGRATED)
 		se->exec_start = 0;
-- 
2.17.1