/sys/kernel/debug

/sys/kernel/debug is the directory on which debugfs is typically mounted.

The purpose of this file system is to make information available to user space.

It differs from /proc in that /proc makes process related information information available.

It also differs from the sysfs file system (/sys) because sysfs allows one value per file only and /sys/kernel/debug explicitely does not state any rule on the format of its files.