linux-kernel - Re: [PATCH -tip tracing/kprobes 0/9] tracing/kprobes, perf: perf probe and kprobe-tracer bugfixes

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Message-ID: <ad7a95ae0910191859l6e0246b8u8634fac5b8ec0770@mail.gmail.com>
Date:	Mon, 19 Oct 2009 21:59:42 -0400
From:	Ashwin Chaugule <ashbertslists@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Mackerras <paulus@...ba.org>, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH -tip tracing/kprobes 0/9] tracing/kprobes, perf: perf 
	probe and kprobe-tracer bugfixes

On Mon, Oct 19, 2009 at 8:30 PM, Masami Hiramatsu <mhiramat@...hat.com> wrote:
>
> Actually, perf-probe can add tracepoint-like events. It will allow you
> to probe function inside by both C-source-line level and address level.
> perf-probe already supports inline function too.
>
> Currently, even its syntax is unstable, but you can add an event inside
> some function which is at cfile.c line 100, as below;
>
>  perf probe -P 'p:probe1 cfile.c:100'
>
> and you can trace it by using perf record as same as other tracepoints
>
>  perf record -f -e kprobes:myprobe:record -F 1 -a ls
>
>
>> Alternately, I think even dynamic trace could provide similar insight
>> with perfevents ? If none of this is already done, I plan to work on
>> this in my spare time and would like to team up with anyone else
>> interested.
>
> Yes, it's done as I said above.
> But it still has long TODO list, including support type of arguments,
> arrays, fields of structures and so on (of course, defining useful
> syntax too). So any comments and contributes are welcome :-)
>
Excellent ! Time to give it a spin :)

Cheers,
Ashwin
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