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

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Message-ID: <1486596530.2871.22.camel@tzanussi-mobl.amr.corp.intel.com>
Date:   Wed, 08 Feb 2017 17:28:50 -0600
From:   Tom Zanussi <tom.zanussi@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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, 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

Tom