linux-kernel - Re: [RFC][PATCH 00/21] tracing: Inter-event (e.g. latency) support

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Message-ID: <20170208211431.467477f5@grimm.local.home>
Date:   Wed, 8 Feb 2017 21:14:31 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:     tglx@...utronix.de, mhiramat@...nel.org, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [RFC][PATCH 00/21] tracing: Inter-event (e.g. latency) support

On Wed, 08 Feb 2017 17:28:50 -0600
Tom Zanussi <tom.zanussi@...ux.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.zanussi@...ux.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