Comment # 72 on bug 67051 from Alex

(In reply to comment #71)
> > echo nop > /sys/.../current_tracer (I forget the exact file, but it's on
> > that wiki page).
> 
> Speaking of that, I don't have '/sys/kernel/debug/'
> Looking around I do have
> DEBUG_KERNEL and DEBUG_DRIVER both on "yes".
> What gives?

I've figured it out.
Debug Filesystem: yes
CONFIG_DEBUG_FS --> /sys/kernel/debug/  !!!???

Who'd have thunk it?