linux-kernel - [PATCH 1/6] sched_ext: Introduce SCX_OPS_NODE_BUILTIN

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Message-ID: <20241209230242.775225-2-arighi@nvidia.com>
Date: Mon,  9 Dec 2024 23:56:25 +0100
From: Andrea Righi <arighi@...dia.com>
To: Tejun Heo <tj@...nel.org>,
	David Vernet <void@...ifault.com>
Cc: Yury Norov <yury.norov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] sched_ext: Introduce SCX_OPS_NODE_BUILTIN_IDLE

Add a flag (SCX_OPS_NODE_BUILTIN_IDLE) to toggle between a global flat
idle cpumask and multiple per-node CPU masks.

Signed-off-by: Andrea Righi <arighi@...dia.com>
---
 kernel/sched/ext.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 71342f3719c1..3d13e7975abd 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -122,6 +122,12 @@ enum scx_ops_flags {
 	 */
 	SCX_OPS_SWITCH_PARTIAL	= 1LLU << 3,
 
+	/*
+	 * If set, enable per-node idle cpumasks. If clear, use a single global
+	 * flat idle cpumask.
+	 */
+	SCX_OPS_BUILTIN_IDLE_PER_NODE = 1LLU << 4,
+
 	/*
 	 * CPU cgroup support flags
 	 */
@@ -131,6 +137,7 @@ enum scx_ops_flags {
 				  SCX_OPS_ENQ_LAST |
 				  SCX_OPS_ENQ_EXITING |
 				  SCX_OPS_SWITCH_PARTIAL |
+				  SCX_OPS_BUILTIN_IDLE_PER_NODE |
 				  SCX_OPS_HAS_CGROUP_WEIGHT,
 };
 
-- 
2.47.1