From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Philippe Gerum <rpm@xenomai.org>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] i-pipe tracer on in production kernels? (was Re: Altera Cyclone V)
Date: Sat, 11 Jan 2014 19:27:22 +0100 [thread overview]
Message-ID: <52D18D0A.8010905@xenomai.org> (raw)
In-Reply-To: <52D18B7D.5080705@xenomai.org>
On 01/11/2014 07:20 PM, Philippe Gerum wrote:
> On 01/11/2014 11:22 AM, Michael Haberler wrote:
>>
>> http://www.xenomai.org/index.php/I-pipe:Tracer describes the trace API, which could be useful to track down issues
>>
>> Q: does enabling the tracer incur significant overhead if compiled in but unused, or is it reasonable to leave it on in a production kernel?
>>
>> if the former, we might have to build/make available a second i-pipe tracer enabled kernel to track down issues 'in the field'; if the latter, it'd be less build/distribution chores
>>
>
> The I-pipe tracer is based on the ftrace infrastructure, so tracepoints
> are left out when the tracer is disabled. If you can live with the
> minimal overhead ftrace adds, then leaving the I-pipe tracer code built
> in may be an option.
That is less true without DYNAMIC_FTRACE than with DYNAMIC_FTRACE.
--
Gilles.
next prev parent reply other threads:[~2014-01-11 18:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-07 19:52 [Xenomai] Altera Cyclone V Lowell Gilbert
2014-01-07 20:25 ` Gilles Chanteperdrix
2014-01-08 22:45 ` Lowell Gilbert
2014-01-08 23:19 ` Gilles Chanteperdrix
2014-01-09 18:06 ` Lowell Gilbert
2014-01-10 0:14 ` Gilles Chanteperdrix
2014-01-14 0:15 ` Lowell Gilbert
2014-01-07 22:19 ` Charles Steinkuehler
2014-01-07 22:47 ` Gilles Chanteperdrix
2014-01-07 22:55 ` Charles Steinkuehler
2014-01-07 23:13 ` Gilles Chanteperdrix
2014-01-08 0:51 ` Charles Steinkuehler
2014-01-08 4:04 ` Charles Steinkuehler
2014-01-08 8:21 ` Gilles Chanteperdrix
2014-01-08 8:58 ` Gilles Chanteperdrix
2014-01-11 10:22 ` [Xenomai] i-pipe tracer on in production kernels? (was Re: Altera Cyclone V) Michael Haberler
2014-01-11 12:16 ` Gilles Chanteperdrix
2014-01-11 18:11 ` Gilles Chanteperdrix
2014-01-11 18:20 ` Philippe Gerum
2014-01-11 18:27 ` Gilles Chanteperdrix [this message]
2014-01-11 19:01 ` Philippe Gerum
2014-01-11 19:11 ` Gilles Chanteperdrix
2014-01-08 3:21 ` [Xenomai] Altera Cyclone V Lowell Gilbert
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