From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: David <david35k@gmail.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] filter ipipe tracing
Date: Tue, 14 Jan 2014 13:47:32 +0100 [thread overview]
Message-ID: <52D531E4.4040407@xenomai.org> (raw)
In-Reply-To: <CA+6vZpS6Mw7rfvHnNBkB-9Jd9C-UUjRJ_hD6Ket_f__8F8iaLg@mail.gmail.com>
On 01/14/2014 01:35 PM, David wrote:
> Dear,
>
> I'm actually tracing my Xenomai drivers/syscalls thanks to the ipipe trace
> facility. Actually, every "ipipe/xenomai/rtdm drivers" procedures are
> traced. I give a try with 5000 points, I'm able to trace about 5ms of
> execution. This is already a huge help for some problems but (a) it is too
> short for my new needs. The performance impact of tracing appears big
> (about x2 on performance ?), (b) it makes my application instable (100% of
> CPU usage).
>
> (a) Is it possible to trace about 1-10s of execution ? (any hint ?).
> (b) Could we reduce performance impact for tracing ? I used FTRACE in the
> past, it was possible to filter the events or procedure names traced but I
> don't know how to proceed with ipipe tracing.
If you are only interested in the events you generate, then you can
disable tracing of function entries and exit, and generate the events
you are interested in with ipipe_trace_special.
--
Gilles.
next prev parent reply other threads:[~2014-01-14 12:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-14 12:35 [Xenomai] filter ipipe tracing David
2014-01-14 12:47 ` Gilles Chanteperdrix [this message]
2014-01-14 17:30 ` David
2014-01-14 18:04 ` Jan Kiszka
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