linux-kernel - [PATCH v2 3/3] sched/fair: Use rq in update_blocked

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Date: Mon, 15 Jan 2024 15:34:26 +0100
From: Pierre Gondois <pierre.gondois@....com>
To: linux-kernel@...r.kernel.org
Cc: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>,
	Pierre Gondois <pierre.gondois@....com>,
	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>,
	Huang Ying <ying.huang@...el.com>
Subject: [PATCH v2 3/3] sched/fair: Use rq in update_blocked_averages()

update_blocked_averages() could receive a 'struct rq' instead of a
CPU number to avoid converting the CPU number to a 'struct rq'
multiple times.

Suggested-by: Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>
Signed-off-by: Pierre Gondois <pierre.gondois@....com>
---
 kernel/sched/fair.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 97d9e0d32337..c70bb993f473 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9349,10 +9349,9 @@ static unsigned long task_h_load(struct task_struct *p)
 }
 #endif
 
-static void update_blocked_averages(int cpu)
+static void update_blocked_averages(struct rq *rq)
 {
 	bool decayed = false, done = true;
-	struct rq *rq = cpu_rq(cpu);
 	struct rq_flags rf;
 
 	rq_lock_irqsave(rq, &rf);
@@ -12026,7 +12025,7 @@ static bool update_nohz_stats(struct rq *rq)
 	if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
 		return true;
 
-	update_blocked_averages(cpu);
+	update_blocked_averages(rq);
 
 	return rq->has_blocked_load;
 }
@@ -12286,7 +12285,7 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
 	raw_spin_rq_unlock(this_rq);
 
 	t0 = sched_clock_cpu(this_cpu);
-	update_blocked_averages(this_cpu);
+	update_blocked_averages(this_rq);
 
 	rcu_read_lock();
 	for_each_domain(this_cpu, sd) {
@@ -12376,7 +12375,7 @@ static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
 		return;
 
 	/* normal load balance */
-	update_blocked_averages(this_rq->cpu);
+	update_blocked_averages(this_rq);
 	rebalance_domains(this_rq, idle);
 }
 
-- 
2.25.1