[ltt-dev] LTTng Trace Format

[ltt-dev] LTTng Trace Format

[Stadelmann Jérôme]

Hi Mathieu,

I'm currently looking at the trace format using the following document (http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/format.html) and I have some difficulties to retrieve the information.
I've found the magic number 0x00D6B7ED to early in the binary files (with an offset of 16 bytes) and the block start header is 24 bytes long. Does the format changed in a recent version or am I mistaken ?

Best regards,
J?r?me Stadelmann

[ltt-dev] LTTng Trace Format

[Mathieu Desnoyers]

* Stadelmann J?r?me (jerome.stadelmann at heig-vd.ch) wrote:
> Hi Mathieu,
> 
> I'm currently looking at the trace format using the following document (http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/format.html) and I have some difficulties to retrieve the information.
> I've found the magic number 0x00D6B7ED to early in the binary files (with an offset of 16 bytes) and the block start header is 24 bytes long. Does the format changed in a recent version or am I mistaken ?
> 
> Best regards,
> J?r?me Stadelmann
> 

Yes, the format has changed since this document has been updated. The
best information source would be

http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=blob;f=include/linux/ltt-tracer.h;h=2ae278cd4afd8d97e363e8d0a21449a20012575e;hb=HEAD

struct ltt_subbuffer_header (is also the trace header, repeated at each
subbuffer)

ltt_write_event_header() : writes the event header.

Mathieu

-- 
Mathieu Desnoyers
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