linux-kernel - [RFC PATCH 3/5] sched/fair: Don't use parked cpu for load balancing

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Message-ID: <20250523181448.3777233-4-sshegde@linux.ibm.com>
Date: Fri, 23 May 2025 23:44:46 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, tglx@...utronix.de, yury.norov@...il.com,
        maddy@...ux.ibm.com
Cc: sshegde@...ux.ibm.com, vschneid@...hat.com, dietmar.eggemann@....com,
        rostedt@...dmis.org, jstultz@...gle.com, kprateek.nayak@....com,
        huschle@...ux.ibm.com, srikar@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux@...musvillemoes.dk
Subject: [RFC PATCH 3/5] sched/fair: Don't use parked cpu for load balancing

While doing load balance, don't consider the parked CPUs. As far as load
balance is considered, a parked CPU is as good as offline CPU. 

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 125912c0e9dd..f48f55ca1522 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -11761,6 +11761,7 @@ static int sched_balance_rq(int this_cpu, struct rq *this_rq,
 	};
 
 	cpumask_and(cpus, sched_domain_span(sd), cpu_active_mask);
+	cpumask_andnot(cpus, cpus, cpu_parked_mask);
 
 	schedstat_inc(sd->lb_count[idle]);
 
-- 
2.39.3