From mboxrd@z Thu Jan  1 00:00:00 1970
From: Frank Rowand <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node
 lifecyle
Date: Wed, 19 Apr 2017 21:47:56 -0700
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To: Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>, Tyrel Datwyler <turtle.in.the.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>, Tyrel Datwyler <tyreld-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nfont-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
List-Id: devicetree@vger.kernel.org

On 04/19/17 19:33, Steven Rostedt wrote:
> On Wed, 19 Apr 2017 16:27:10 -0700
> Tyrel Datwyler <turtle.in.the.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
>> # echo stacktrace > /sys/kernel/debug/tracing/trace_options
>> # cat trace | grep -A6 "/pci@800000020000018"
> 
> Just to let you know that there is now stacktrace event triggers, where
> you don't need to stacktrace all events, you can pick and choose. And
> even filter the stack trace on specific fields of the event.
> 
>  # cd /sys/kernel/debug/tracing
>  # echo "stacktrace if common_pid == $$ && reason == 3" \
>    > events/tlb/tlb_flush/trigger
> 
>  # cat trace
>             bash-1103  [003] ...1  1290.100133: tlb_flush: pages:-1 reason:local mm shootdown (3)
>             bash-1103  [003] ...2  1290.100140: <stack trace>
>  => copy_process.part.39
>  => _do_fork
>  => SyS_clone
>  => do_syscall_64
>  => return_from_SYSCALL_64
> 
> -- Steve
> .
> 

Thanks for chiming in.

The power and flexibility of the trace tools is quite amazing
I need to make room in my schedule to catch up on what has been
added in the last several years.

-Frank
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