linux-kernel - [PATCH v4 2/3] sched/debug: dump domains' level

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Date: Tue, 30 Apr 2024 18:05:24 +0300
From: Vitalii Bursov <vitaly@...sov.com>
To: 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>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Vitalii Bursov <vitaly@...sov.com>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: [PATCH v4 2/3] sched/debug: dump domains' level

Knowing domain's level exactly can be useful when setting
relax_domain_level or cpuset.sched_relax_domain_level

Usage:
cat /debug/sched/domains/cpu0/domain1/level
to dump cpu0 domain1's level.

SDM macro is not used because sd->level is int and
it would hide the type mismatch between int and u32.

Signed-off-by: Vitalii Bursov <vitaly@...sov.com>
Acked-by: Vincent Guittot <vincent.guittot@...aro.org>
Tested-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/debug.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 8d5d98a5834d..c1eb9a1afd13 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -425,6 +425,7 @@ static void register_sd(struct sched_domain *sd, struct dentry *parent)
 
 	debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
 	debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops);
+	debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level);
 }
 
 void update_sched_domain_debugfs(void)
-- 
2.20.1