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Message-Id: <20250107014605.52403-1-jameshongleiwang@126.com>
Date: Tue,  7 Jan 2025 09:46:05 +0800
From: Honglei Wang <jameshongleiwang@....com>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com,
	changwoo@...lia.com
Cc: 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,
	vschneid@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] sched_ext: switch class when preempted by higher priority scheduler

It might be helpful to give BPF Scheduler a chance to invoke
cpu_release() function, if defined, when preempted by a higher
priority scheduler class task.

Signed-off-by: Honglei Wang <jameshongleiwang@....com>
---
 kernel/sched/ext.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 19d2699cf638..ef0e3f2c1e6f 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -3034,7 +3034,7 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p,
 		 */
 		if (p->scx.slice && !scx_rq_bypassing(rq)) {
 			dispatch_enqueue(&rq->scx.local_dsq, p, SCX_ENQ_HEAD);
-			return;
+			goto switch_class;
 		}
 
 		/*
@@ -3051,6 +3051,7 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p,
 		}
 	}
 
+switch_class:
 	if (next && next->sched_class != &ext_sched_class)
 		switch_class(rq, next);
 }
-- 
2.45.2


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