linux-kernel - Re: [PATCH 1/5] perf/sdt: Show proper hint

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Date:   Thu, 2 Feb 2017 14:40:48 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     acme@...hat.com, alexis.berlemont@...il.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        mpe@...erman.id.au, naveen.n.rao@...ux.vnet.ibm.com,
        mhiramat@...nel.org, maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH 1/5] perf/sdt: Show proper hint


* Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> After patch:
>   $ perf record -e sdt_glib:main__after_check
>     event syntax error: 'sdt_glib:idle__add'
>                      \___ unknown tracepoint
> 
>     Error:  File /sys/kernel/debug/tracing/events/sdt_glib/idle__add ...
>     Hint:   SDT event has to be probed before recording it.

So what is the command line option to 'probe' an SDT event? Could you give an 
example that would make the above command work?

Thanks,

	Ingo