linux-kernel - [tip: sched/core] sched/fair: Update min_vruntime for reweight

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Date:   Wed, 29 Nov 2023 14:55:31 -0000
From:   "tip-bot2 for Yiwei Lin" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yiwei Lin <s921975628@...il.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Abel Wu <wuyun.abel@...edance.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Update min_vruntime for
 reweight_entity() correctly

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

Commit-ID:     5068d84054b766efe7c6202fc71b2350d1c326f1
Gitweb:        https://git.kernel.org/tip/5068d84054b766efe7c6202fc71b2350d1c326f1
Author:        Yiwei Lin <s921975628@...il.com>
AuthorDate:    Fri, 17 Nov 2023 16:01:06 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 29 Nov 2023 15:43:52 +01:00

sched/fair: Update min_vruntime for reweight_entity() correctly

Since reweight_entity() may have chance to change the weight of
cfs_rq->curr entity, we should also update_min_vruntime() if
this is the case

Fixes: eab03c23c2a1 ("sched/eevdf: Fix vruntime adjustment on reweight")
Signed-off-by: Yiwei Lin <s921975628@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Abel Wu <wuyun.abel@...edance.com>
Link: https://lore.kernel.org/r/20231117080106.12890-1-s921975628@gmail.com
---
 kernel/sched/fair.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 34fe6e9..bcea3d5 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3815,17 +3815,17 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
 	enqueue_load_avg(cfs_rq, se);
 	if (se->on_rq) {
 		update_load_add(&cfs_rq->load, se->load.weight);
-		if (!curr) {
-			/*
-			 * The entity's vruntime has been adjusted, so let's check
-			 * whether the rq-wide min_vruntime needs updated too. Since
-			 * the calculations above require stable min_vruntime rather
-			 * than up-to-date one, we do the update at the end of the
-			 * reweight process.
-			 */
+		if (!curr)
 			__enqueue_entity(cfs_rq, se);
-			update_min_vruntime(cfs_rq);
-		}
+
+		/*
+		 * The entity's vruntime has been adjusted, so let's check
+		 * whether the rq-wide min_vruntime needs updated too. Since
+		 * the calculations above require stable min_vruntime rather
+		 * than up-to-date one, we do the update at the end of the
+		 * reweight process.
+		 */
+		update_min_vruntime(cfs_rq);
 	}
 }