linux-kernel - [PATCH] sched/topology: Covered all cpus of same node in asymmetric node setups

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Message-Id: <20230729222203.5601-1-huangbing775@126.com>
Date:   Sun, 30 Jul 2023 06:22:03 +0800
From:   Bing Huang <huangbing775@....com>
To:     dietmar.eggemann@....com
Cc:     rostedt@...dmis.org, brauner@...nel.org, bristot@...hat.com,
        bsegall@...gle.com, juri.lelli@...hat.com,
        linux-kernel@...r.kernel.org, mgorman@...e.de, mingo@...hat.com,
        peterz@...radead.org, vincent.guittot@...aro.org
Subject: [PATCH] sched/topology: Covered all cpus of same node in asymmetric node setups

in asymmetric node setups, if one cpu'sd spans is empty in some depth,
others in same node do

Signed-off-by: Bing Huang <huangbing@...inos.cn>
---
 kernel/sched/topology.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 7cfcfe5d27b9..8c5372ad7694 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1045,8 +1045,10 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
 		 * Domains should always include the CPU they're built on, so
 		 * check that.
 		 */
-		if (!cpumask_test_cpu(i, sched_domain_span(sibling)))
+		if (!cpumask_test_cpu(i, sched_domain_span(sibling))) {
+			cpumask_or(covered, covered, cpumask_of_node(cpu_to_node(i)));
 			continue;
+		}
 
 		/*
 		 * Usually we build sched_group by sibling's child sched_domain
-- 
2.25.1