[tip: sched/core] sched/debug: Print the local group's asym_prefer_cpu

[tip-bot2 for K Prateek Nayak]

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

Commit-ID:     44671e21e3463f36f6c6e4b691216f60e85840e4
Gitweb:        https://git.kernel.org/tip/44671e21e3463f36f6c6e4b691216f60e85840e4
Author:        K Prateek Nayak <kprateek.nayak@xxxxxxx>
AuthorDate:    Wed, 09 Apr 2025 05:34:46 
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 16 Apr 2025 21:09:11 +02:00

sched/debug: Print the local group's asym_prefer_cpu

Add a file to read local group's "asym_prefer_cpu" from debugfs. This
information was useful when debugging issues where "asym_prefer_cpu" was
incorrectly set to a CPU with a lower asym priority.

Signed-off-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20250409053446.23367-5-kprateek.nayak@xxxxxxx
---
 kernel/sched/debug.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 56ae54e..5572468 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -588,6 +588,10 @@ 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);
+
+	if (sd->flags & SD_ASYM_PACKING)
+		debugfs_create_u32("group_asym_prefer_cpu", 0444, parent,
+				   (u32 *)&sd->groups->asym_prefer_cpu);
 }
 
 void update_sched_domain_debugfs(void)