From: Philippe Gerum <rpm@xenomai.org>
To: Michael Haberler <haberlerm@gmail.com>, xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] Q: LTTNG & xenomai status
Date: Mon, 30 Mar 2015 11:17:16 +0200 [thread overview]
Message-ID: <5519149C.4030505@xenomai.org> (raw)
In-Reply-To: <CADvZd9af58_fHQYDMpQ+g3caew0_W144kCKGeCpFi7uGP3FD1A@mail.gmail.com>
On 03/30/2015 10:58 AM, Michael Haberler wrote:
> 2015-03-26 23:37 GMT+01:00 Michael Haberler <haberlerm@gmail.com>:
>
>> what is the status on using LTTNG tracepoints in an RT thread? the last
>> discussion has been a while back, like 2010ish
>>
>> LTTNG 2.5.1 is in the debian jessie stream. Can I use that as-is?
>>
>> Any special precautions I need to take, or do the stock instructions for
>> LTTNG apply?
>>
>
> noting that CONFIG_FTRACE was disabled for performance reasons:
> http://www.xenomai.org/pipermail/xenomai/2013-January/027272.html
>
> that would suggest *functionally* it is not an issue, and LTTng layers
> ontop of CONFIG_FTRACE for kernel tracing
>
> or am I overlooking something?
>
Functionally it is not an issue, but the LTT core for any given LTT
version might not be entirely safe for running over a kernel with
pipelined interrupts. Fixing this is part of the usual process of
merging LTTng and the I-pipe.
--
Philippe.
next prev parent reply other threads:[~2015-03-30 9:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 22:37 [Xenomai] Q: LTTNG & xenomai status Michael Haberler
2015-03-30 8:58 ` Michael Haberler
2015-03-30 9:17 ` Philippe Gerum [this message]
2015-03-30 9:51 ` Michael Haberler
2015-03-30 9:58 ` Philippe Gerum
2015-03-30 16:11 ` Jan Kiszka
2015-03-31 0:00 ` Michael Haberler
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