linux-kernel - [PATCH v2 1/2] sched/eevdf: Always update V if se->on

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Date: Wed,  6 Mar 2024 10:21:32 +0800
From: Tianchen Ding <dtcccc@...ux.alibaba.com>
To: linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Abel Wu <wuyun.abel@...edance.com>
Subject: [PATCH v2 1/2] sched/eevdf: Always update V if se->on_rq when reweighting

reweight_eevdf() needs the latest V to do accurate calculation for new
ve and vd. So update V unconditionally when se is runnable.

Fixes: eab03c23c2a1 ("sched/eevdf: Fix vruntime adjustment on reweight")
Suggested-by: Abel Wu <wuyun.abel@...edance.com>
Signed-off-by: Tianchen Ding <dtcccc@...ux.alibaba.com>
---
 kernel/sched/fair.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 03be0d1330a6..5551ce2af73e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3790,9 +3790,8 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
 
 	if (se->on_rq) {
 		/* commit outstanding execution time */
-		if (curr)
-			update_curr(cfs_rq);
-		else
+		update_curr(cfs_rq);
+		if (!curr)
 			__dequeue_entity(cfs_rq, se);
 		update_load_sub(&cfs_rq->load, se->load.weight);
 	}
-- 
2.39.3