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From: Anders Johansson <epkboan@gmail.com>
To: lttng-dev@lists.lttng.org
Subject: tracepoint_enabled returns true for disabled provider, event
Date: Sat, 7 Sep 2019 14:42:22 +0200	[thread overview]
Message-ID: <CACU0Kcsfzct94bxY06DoQ4x=H+fuKN5JGi6og94YYptOCmz5FQ__19645.2761463419$1568037033$gmane$org@mail.gmail.com> (raw)


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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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             reply	other threads:[~2019-09-07 12:42 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-07 12:42 Anders Johansson [this message]
     [not found] <CACU0Kcsfzct94bxY06DoQ4x=H+fuKN5JGi6og94YYptOCmz5FQ@mail.gmail.com>
2019-09-16 20:48 ` tracepoint_enabled returns true for disabled provider, event Jonathan Rajotte-Julien

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