linux-kernel - [PATCH 4/9] sched: Split up put_prev_task

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Message-Id: <20240813224015.943143811@infradead.org>
Date: Wed, 14 Aug 2024 00:25:52 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: mingo@...nel.org,
 tj@...nel.org,
 void@...ifault.com
Cc: 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,
 joelaf@...gle.com
Subject: [PATCH 4/9] sched: Split up put_prev_task_balance()

With the goal of pushing put_prev_task() after pick_task() / into
pick_next_task().

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/sched/core.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5841,8 +5841,8 @@ static inline void schedule_debug(struct
 	schedstat_inc(this_rq()->sched_count);
 }
 
-static void put_prev_task_balance(struct rq *rq, struct task_struct *prev,
-				  struct rq_flags *rf)
+static void prev_balance(struct rq *rq, struct task_struct *prev,
+			 struct rq_flags *rf)
 {
 #ifdef CONFIG_SMP
 	const struct sched_class *class;
@@ -5860,8 +5860,6 @@ static void put_prev_task_balance(struct
 	}
 #endif
 
-	put_prev_task(rq, prev);
-
 	/*
 	 * We've updated @prev and no longer need the server link, clear it.
 	 * Must be done before ->pick_next_task() because that can (re)set
@@ -5917,7 +5915,8 @@ __pick_next_task(struct rq *rq, struct t
 	}
 
 restart:
-	put_prev_task_balance(rq, prev, rf);
+	prev_balance(rq, prev, rf);
+	put_prev_task(rq, prev);
 
 	for_each_class(class) {
 		p = class->pick_next_task(rq);
@@ -6017,7 +6016,8 @@ pick_next_task(struct rq *rq, struct tas
 		goto out;
 	}
 
-	put_prev_task_balance(rq, prev, rf);
+	prev_balance(rq, prev, rf);
+	put_prev_task(rq, prev);
 
 	smt_mask = cpu_smt_mask(cpu);
 	need_sync = !!rq->core->core_cookie;