From: compudj@krystal.dyndns.org (Mathieu Desnoyers)
Subject: [ltt-dev] Problems on usage of markers in combination with tracepoint probes
Date: Sat, 19 Jun 2010 11:50:54 -0400 [thread overview]
Message-ID: <20100619155054.GB22882@Krystal> (raw)
In-Reply-To: <AANLkTikvutGze72UC6tyuVUDhk3UG5n6QTpA7BJ--thF@mail.gmail.com>
* jerome zh (jeromezhr at gmail.com) wrote:
> Hi Mathieu,
>
> I did some read on the paper of lttng project, especially your Ph.D thesis.
> I have got some questions:
>
> 1. Why and when should the marker be used in combination with tracepoint probes?
LTTng is not aware of tracepoints at the moment. So a marker
"declaration" is required to declare the event type and fields. A
tracepoint probe needs to be connected on the tracepoint to write the
event data into the trace stream. See ltt/ltt-type-serializer.c for
details.
> 2. If I want to insert tracepoints in kernel files, such as
> net/ipv4/ip_input.c, can I implement the tracepoints as module?
> Since samples given in samples/tracepoint do NOT show this.
The tracepoint itself must be inserted into the kernel code.
The tracepoint probes, alongside with marker type declaration, must go
into ltt/probes/, which are basically kernel modules.
Thanks,
Mathieu
>
> --
> Regards,
>
> Jerome
>
> _______________________________________________
> ltt-dev mailing list
> ltt-dev at lists.casi.polymtl.ca
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
>
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
parent reply other threads:[~2010-06-19 15:50 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <AANLkTikvutGze72UC6tyuVUDhk3UG5n6QTpA7BJ--thF@mail.gmail.com>]
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