On Wed, 08 Feb 2017 17:28:50 -0600
Tom Zanussi [off-list ref] wrote:

On Wed, 2017-02-08 at 15:01 -0500, Steven Rostedt wrote:

quoted

On Wed,  8 Feb 2017 11:24:56 -0600
Tom Zanussi [off-list ref] wrote:
  

quoted

    # echo 'wakeup_latency lat=sched_switch:wakeup_lat \
                           pid=sched_switch:woken_pid \
                           prio=sched_switch:woken_prio' >> \
            /sys/kernel/debug/tracing/synthetic_events  

I applied all your patches, did the above and then:

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000034
 IP: free_synthetic_event+0x46/0xb0
 PGD 0 
   

OK, well, the problem is actually the '\' 'continuation' characters in
the above string.  I'll fix that properly, but in the meantime, removing
those chars in the documentation strings will let you try it out i.e.

# echo 'wakeup_latency lat=sched_switch:wakeup_lat pid=sched_switch:woken_pid prio=sched_switch:woken_prio' >> /sys/kernel/debug/tracing/synthetic_events

Ah, OK. Yeah, I did a cut and paste when entering it.

-- Steve