linux-kernel - Re: [PATCH] of: introduce event tracepoints for dynamic device

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Date:   Thu, 20 Apr 2017 09:37:04 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tyrel Datwyler <turtle.in.the.kernel@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Frank Rowand <frowand.list@...il.com>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>, robh+dt@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nfont@...ux.vnet.ibm.com,
        mingo@...hat.com
Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node
 lifecyle

On Wed, 19 Apr 2017 22:24:58 -0700
Tyrel Datwyler <turtle.in.the.kernel@...il.com> wrote:

> On 04/19/2017 07:33 PM, Steven Rostedt wrote:
> > On Wed, 19 Apr 2017 16:27:10 -0700
> > Tyrel Datwyler <turtle.in.the.kernel@...il.com> wrote:
> >   
> >> # echo stacktrace > /sys/kernel/debug/tracing/trace_options
> >> # cat trace | grep -A6 "/pci@...000020000018"  
> > 
> > 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.  
> 
> This is great, and I did figure that out this afternoon. One thing I was
> still trying to determine though was whether its possible to set these
> triggers at boot? As far as I could tell I'm still limited to
> "trace_options=stacktrace" as a kernel boot parameter to get the stack
> for event tracepoints.

No not yet. But I'll add that to the todo list.

Thanks,

-- Steve