----- On Nov 17, 2016, at 12:21 PM, Mark E. Dawson, Jr. <[email protected]>
wrote:
> Mathieu,
> My query appears to be getting dropped by the mailing list, forcing me to ask
> you directly which I understand is both inefficient and a nuisance. We met
> when
> I spoke (along with Christoph Lameter) at the Tracing Summit a couple years
> back.
Hi Mark,
Not sure why the mailing list would have dropped your email. Everything looks
fine in the
admin interface. Adding it in CC. (Michael, can you check if lttng-dev has
issues with emails
from yahoo domains ?)
> Anyway, my question is as follows:
> If I want to remove a ton of compiled-in calls to an "rdtsc-based" C timing
> function and make them all conditionally-enabled based on whether or not I
> enable a tracing session, I can do so by adding the aforementioned "rdtsc"
> call
> as one of the arguments to tracepoint() along with our defined provider and
> event name, correct?
You can take a few approaches there:
1) Use if (tracepoint_enabled()) { ..read tsc... do_tracepoint(...); }
2) do this function call or static inline invocation as an argument of
tracepoint().
3) do the function call/static inline invocation within the tracepoint probe
provider
(TRACEPOINT_EVENT() code).
Let me know if I somehow misunderstood the intent of your question.
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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