linux-kernel - [tip: sched/core] sched/fair: Fix sched

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Message-ID: <176613221140.510.276814644472640242.tip-bot2@tip-bot2>
Date: Fri, 19 Dec 2025 08:16:51 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: kernel test robot <oliver.sang@...el.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Fix sched_avg fold

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

Commit-ID:     6ab7973f254071faf20fe5fcc502a3fe9ca14a47
Gitweb:        https://git.kernel.org/tip/6ab7973f254071faf20fe5fcc502a3fe9ca14a47
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Fri, 19 Dec 2025 09:04:45 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 19 Dec 2025 09:09:38 +01:00

sched/fair: Fix sched_avg fold

After the robot reported a regression wrt commit: 089d84203ad4 ("sched/fair:
Fold the sched_avg update"), Shrikanth noted that two spots missed a factor
se_weight().

Fixes: 089d84203ad4 ("sched/fair: Fold the sched_avg update")
Reported-by: kernel test robot <oliver.sang@...el.com>
Closes: https://lore.kernel.org/oe-lkp/202512181208.753b9f6e-lkp@intel.com
Debugged-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://patch.msgid.link/20251218102020.GO3707891@noisy.programming.kicks-ass.net
---
 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 76f5e4b..7377f91 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3775,13 +3775,15 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 static inline void
 enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	__update_sa(&cfs_rq->avg, load, se->avg.load_avg, se->avg.load_sum);
+	__update_sa(&cfs_rq->avg, load, se->avg.load_avg,
+		    se_weight(se) * se->avg.load_sum);
 }
 
 static inline void
 dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	__update_sa(&cfs_rq->avg, load, -se->avg.load_avg, -se->avg.load_sum);
+	__update_sa(&cfs_rq->avg, load, -se->avg.load_avg,
+		    se_weight(se) * -se->avg.load_sum);
 }
 
 static void place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags);