[ltt-dev] [UST] Instrumentation API changes done

[ltt-dev] [UST] Instrumentation API changes done

[Mathieu Desnoyers]

Hi,

I would appreciate if you could have a look at the API change
implementation I pushed into UST. For now, it should cover the most
critical parts. In its current state, I think the ust_marker() API is
pretty much final, so people can start using it for debug-only in their
application and expect it not to change. For the Tracepoints, the
DECLARE/DEFINE_TRACEPOINT will eventually become internal to
TRACEPOINT_EVENT(). We can expect further changes to the
TRACEPOINT_EVENT() API, as we will very likely need to change the other
macros that come with it.

While we are there, I am tempted to kill TRACEPOINT_EVENT_FN(), because
it was only needed for specific syscall tracing, and I don't really
expect to let the instrumentation to be controlled so closely by the
application code in user-space. Thoughts ?

Also, I'd really like to push a UST 0.13 out the door with the new
instrumentation ASAP. At least people will be able to start using
ust_mark() without fear that the carpet will be removed from under their
feet. ;-)

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com

[ltt-dev] [UST] Instrumentation API changes done

[Nils Carlson]

Hi,

On Fri, 22 Apr 2011, Mathieu Desnoyers wrote:

> Hi,
>
> I would appreciate if you could have a look at the API change
> implementation I pushed into UST. For now, it should cover the most
> critical parts. In its current state, I think the ust_marker() API is
> pretty much final, so people can start using it for debug-only in their
> application and expect it not to change. For the Tracepoints, the
> DECLARE/DEFINE_TRACEPOINT will eventually become internal to
> TRACEPOINT_EVENT(). We can expect further changes to the
> TRACEPOINT_EVENT() API, as we will very likely need to change the other
> macros that come with it.
>

The changes look good to me. No real comments. I'll have a look at the 
documentation when I can.

> While we are there, I am tempted to kill TRACEPOINT_EVENT_FN(), because
> it was only needed for specific syscall tracing, and I don't really
> expect to let the instrumentation to be controlled so closely by the
> application code in user-space. Thoughts ?

Nope. No thoughts, just emptiness here... ;-)

> Also, I'd really like to push a UST 0.13 out the door with the new
> instrumentation ASAP. At least people will be able to start using
> ust_mark() without fear that the carpet will be removed from under their
> feet. ;-)

I think it will have to wait a few days at least, but then we should be 
ready.

/Nils

> Thanks,
>
> Mathieu
>
> -- 
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com
>
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