From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anders Johansson <epkboan@gmail.com>
Subject: tracepoint_enabled returns true for disabled provider,
 event
Date: Sat, 7 Sep 2019 14:42:22 +0200
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Hi

I troubleshooting a huge application where i experience the problem that
even if tracepoint_enabled is used i get the huge overhead of formatting
the output even if then the message is not sent to the lttng buffers.

The tracepoint loglevel is set to TRACE_INFO using the TRACEPOINT_LOGLEVEL
macro. I managed to rebuild the application setting the level to
TRACE_DEBUG instead and then i could print continuously that the
tracepoint_enabled returned false. If i flip it back to TRACE_INFO
tracepoint_enabled always returns true, hence do lots of string building
but then no trace is actually sent off to lttng (which is correct since i
haven't enabled the tracepoint). Even if i explicitly do disable event on
the provider and tracepoint the TRACE_INFO tracepoints returns true in
tracepoint_enabled

Is this by design that tracepoint_enabled always returns true for
TRACE_INFO and lower values or is this configurable in any way?

I am using this inside a docker image running Wind River Linux
bash-4.3# lttng --version
lttng (LTTng Trace Control) 2.10.6 - KeKriek - v2.10.6-11-g8fcbf96
bash-4.3#

Any advice are welcome!
//Anders

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<div dir=3D"ltr">Hi<div><br></div><div>I troubleshooting a huge application=
 where i experience the problem that even if tracepoint_enabled is used i g=
et the huge overhead of formatting the output even if then the message is n=
ot sent to the lttng buffers.=C2=A0</div><div><br></div><div>The tracepoint=
 loglevel is set to TRACE_INFO using the TRACEPOINT_LOGLEVEL macro. I manag=
ed to rebuild the application setting the level to TRACE_DEBUG instead and =
then i could print continuously=C2=A0that the tracepoint_enabled returned f=
alse. If i flip it back to TRACE_INFO tracepoint_enabled always returns tru=
e, hence do lots of string building but then no trace is actually sent off =
to lttng (which is correct since i haven&#39;t enabled the tracepoint). Eve=
n if i explicitly do disable event on the provider and tracepoint the TRACE=
_INFO tracepoints returns true in tracepoint_enabled</div><div><br></div><d=
iv>Is this by design that tracepoint_enabled always returns true for TRACE_=
INFO and lower values or is this configurable=C2=A0in any way?</div><div><b=
r></div><div>I am using this inside a docker image running Wind River Linux=
=C2=A0</div><div>bash-4.3# lttng --version<br>lttng (LTTng Trace Control) 2=
.10.6 - KeKriek - v2.10.6-11-g8fcbf96<br>bash-4.3#=C2=A0<br></div><div><br>=
</div><div>Any advice are welcome!</div><div>//Anders</div><div><br></div><=
div>=C2=A0</div></div>

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