Debugging with /proc or /sys

Instead of dumping messages in the kernel log, you can have your drivers make information available to user space

• Through a file in /proc or /sys, which contents are handled by callbacks defined and registered by your driver.

• Can be used to show any piece of information about your device or driver.

• Can also be used to send data to the driver or to control it.

• Caution: anybody can use these files. You should remove your debugging interface in production!

• Since the arrival of debugfs, no longer the preferred debugging mechanism