linux-kernel - [PATCH 3/5] sched_ext: idle: introduce SCX_PICK_IDLE_IN

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Message-ID: <20250206202109.384179-4-arighi@nvidia.com>
Date: Thu,  6 Feb 2025 21:15:33 +0100
From: Andrea Righi <arighi@...dia.com>
To: Tejun Heo <tj@...nel.org>,
	David Vernet <void@...ifault.com>,
	Changwoo Min <changwoo@...lia.com>
Cc: 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>,
	Valentin Schneider <vschneid@...hat.com>,
	Ian May <ianm@...dia.com>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] sched_ext: idle: introduce SCX_PICK_IDLE_IN_NODE

Introduce a new flag to restrict the selection of an idle CPU to a
single specific NUMA node.

Signed-off-by: Andrea Righi <arighi@...dia.com>
---
 kernel/sched/ext.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 0063a646124bc..8dbe22167c158 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -775,6 +775,7 @@ enum scx_deq_flags {
 
 enum scx_pick_idle_cpu_flags {
 	SCX_PICK_IDLE_CORE	= 1LLU << 0,	/* pick a CPU whose SMT siblings are also idle */
+	SCX_PICK_IDLE_IN_NODE	= 1LLU << 1,	/* pick a CPU in the same target NUMA node */
 };
 
 enum scx_kick_flags {
-- 
2.48.1