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From: Vitalii Bursov <vitaly@bursov.com>
To: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>,
	Mel Gorman <mgorman@suse.de>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Valentin Schneider <vschneid@redhat.com>,
	linux-kernel@vger.kernel.org,
	Vitalii Bursov <vitaly@bursov.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>
Subject: [PATCH v4 2/3] sched/debug: dump domains' level
Date: Tue, 30 Apr 2024 18:05:24 +0300
Message-Id: <9489b6475f6dd6fbc67c617752d4216fa094da53.1714488502.git.vitaly@bursov.com>
In-Reply-To: <cover.1714488502.git.vitaly@bursov.com>
References: <cover.1714488502.git.vitaly@bursov.com>
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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@bursov.com>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.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