On Wed, 08 Feb 2017 17:28:50 -0600 Tom Zanussi <tom.zanu...@linux.intel.com> wrote:
> On Wed, 2017-02-08 at 15:01 -0500, Steven Rostedt wrote: > > On Wed, 8 Feb 2017 11:24:56 -0600 > > Tom Zanussi <tom.zanu...@linux.intel.com> wrote: > > > > > # 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
