[tip: sched/urgent] sched/debug: Dump domains' level

[tip-bot2 for Vitalii Bursov]

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     287372fa39f579a61e17b000aa74c8418d230528
Gitweb:        https://git.kernel.org/tip/287372fa39f579a61e17b000aa74c8418d230528
Author:        Vitalii Bursov <vitaly@xxxxxxxxxx>
AuthorDate:    Tue, 30 Apr 2024 18:05:24 +03:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 17 May 2024 09:48:25 +02:00

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@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Tested-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Acked-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Reviewed-by: Valentin Schneider <vschneid@xxxxxxxxxx>
Link: https://lore.kernel.org/r/9489b6475f6dd6fbc67c617752d4216fa094da53.1714488502.git.vitaly@xxxxxxxxxx
---
 kernel/sched/debug.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 8d5d98a..c1eb9a1 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)