linux-kernel - [PATCH] sched_ext: Take NUMA node into account when allocating per-CPU cpumasks

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Message-ID: <20250210085225.3272-1-lirongqing@baidu.com>
Date: Mon, 10 Feb 2025 16:52:25 +0800
From: lirongqing <lirongqing@...du.com>
To: <tj@...nel.org>, <void@...ifault.com>, <arighi@...dia.com>,
	<changwoo@...lia.com>, <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>
CC: Li RongQing <lirongqing@...du.com>
Subject: [PATCH] sched_ext: Take NUMA node into account when allocating per-CPU cpumasks

From: Li RongQing <lirongqing@...du.com>

per-CPU cpumasks are dominantly accessed from their own local CPUs,
so allocate them node-local to improve performance.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 kernel/sched/ext.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 8857c07..3fe5a2e 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -6325,15 +6325,16 @@ void __init init_sched_ext_class(void)
 
 	for_each_possible_cpu(cpu) {
 		struct rq *rq = cpu_rq(cpu);
+		int  n = cpu_to_node(cpu);
 
 		init_dsq(&rq->scx.local_dsq, SCX_DSQ_LOCAL);
 		INIT_LIST_HEAD(&rq->scx.runnable_list);
 		INIT_LIST_HEAD(&rq->scx.ddsp_deferred_locals);
 
-		BUG_ON(!zalloc_cpumask_var(&rq->scx.cpus_to_kick, GFP_KERNEL));
-		BUG_ON(!zalloc_cpumask_var(&rq->scx.cpus_to_kick_if_idle, GFP_KERNEL));
-		BUG_ON(!zalloc_cpumask_var(&rq->scx.cpus_to_preempt, GFP_KERNEL));
-		BUG_ON(!zalloc_cpumask_var(&rq->scx.cpus_to_wait, GFP_KERNEL));
+		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_kick, GFP_KERNEL, n));
+		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_kick_if_idle, GFP_KERNEL, n));
+		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_preempt, GFP_KERNEL, n));
+		BUG_ON(!zalloc_cpumask_var_node(&rq->scx.cpus_to_wait, GFP_KERNEL, n));
 		init_irq_work(&rq->scx.deferred_irq_work, deferred_irq_workfn);
 		init_irq_work(&rq->scx.kick_cpus_irq_work, kick_cpus_irq_workfn);
 
-- 
2.9.4