those traces is done using the babeltrace(1) text viewer.
We introduce the notion of \fBtracing domains\fP which is essentially a type of
-tracer (kernel, user space or JUL for now). In the future, we could see more
-tracer like for instance an hypervisor. For some commands, you'll need to
-specify on which domain the command operates (\-u, \-k or \-j). For instance,
-the kernel domain must be specified when enabling a kernel event.
+tracer (kernel, user space, JUL, LOG4J or Python for now). In the future, we
+could see more tracer like for instance an hypervisor. For some commands,
+you'll need to specify on which domain the command operates (\-u, \-k, \-l, \-j
+or \-p). For instance, the kernel domain must be specified when enabling a
+kernel event.
In order to trace the kernel, the session daemon needs to be running as root.
LTTng provides the use of a \fBtracing group\fP (default: tracing). Whomever is
in overwrite mode and with mmap output (splice not supported).
.TP
.BR "\-\-live [USEC]"
-Set the session exclusively in live mode. The paremeter is the delay in micro
+Set the session exclusively in live mode. The parameter is the delay in micro
seconds before the data is flushed and streamed. The live mode allows you to
stream the trace and view it while it's being recorded by any tracer. For that,
you need a lttng-relayd and this session requires a network URL (\-U or
.BR "\-j, \-\-jul"
Apply for Java application using Java Util Logging interface (JUL)
.TP
+.BR "\-l, \-\-log4j"
+Apply for Java application using LOG4J
+.TP
+.BR "\-p, \-\-python"
+Apply for Python application using the logging module.
+.TP
.BR "\-\-tracepoint"
Tracepoint event (default). Userspace tracer supports wildcards at the end
of string. Don't forget to quote to deal with bash expansion.
Tracepoint loglevel range from 0 to loglevel. Listed in the help (\-h).
For the JUL domain, the loglevel ranges are detailed with the \-\-help
option thus starting from SEVERE to FINEST.
+For the LOG4J domain, loglevels range from FATAL to TRACE which are also
+detailed in the help.
+For the Python domain, loglevels range from CRITICAL to DEBUG which are
+detailed in the help as well.
.TP
.BR "\-\-loglevel-only NAME"
Tracepoint loglevel (only this loglevel).
.TP
.BR "\-j, \-\-jul"
Apply for Java application using Java Util Logging interface (JUL)
+.TP
+.BR "\-l, \-\-log4j"
+Apply for Java application using LOG4J
+.TP
+.BR "\-p, \-\-python"
+Apply for Python application using the logging module.
.RE
.PP
calls events).
With \-j alone, the available JUL event from registered application will be
list. The event corresponds to the Logger name in the Java JUL application.
+With \-l alone, the available LOG4J event from registered application will be
+list. The event corresponds to the Logger name in the Java LOG4J application.
+With \-p alone, the available Python event from registered application will be
+list. The event corresponds to the Logger name in the Python application.
With \-u alone, it will list all available user-space events from registered
applications. Here is an example of 'lttng list \-u':
.BR "\-j, \-\-jul"
Apply for Java application using JUL
.TP
+.BR "\-l, \-\-log4j"
+Apply for Java application using LOG4J
+.TP
+.BR "\-p, \-\-python"
+Apply for Python application using the logging module.
+.TP
.BR "\-f, \-\-fields"
List event fields
Name of the snapshot's output.
.TP
.BR "\-m, \-\-max-size SIZE"
-Maximum size in bytes of the snapshot. The maxium size does not include the
+Maximum size in bytes of the snapshot. The maximum size does not include the
metadata file. Human readable format is accepted: {+k,+M,+G}. For instance,
\-\-max-size 5M
.RE
.PP
-.SH "JUL DOMAIN"
-This section explains the JUL domain (\-j, \-\-jul) where JUL stands for Java
-Util Logging. You can use that feature by using the \fBliblttng-ust-jul.so\fP
-from the lttng-ust(3) project.
+.SH "JUL/LOG4J DOMAIN"
+
+This section explains the JUL and LOG4J domain where JUL stands for Java Util
+Logging. You can use these by using the \fBliblttng-ust-<domain>-jni.so\fP from
+the lttng-ust(3) project.
The LTTng Java Agent uses JNI to link the UST tracer to the Java application
that uses the agent. Thus, it behaves similarly to the UST domain (\-u). When
-enabling events with the JUL domain, you enable a Logger name that will then be
-mapped to a default UST tracepoint called \fBlttng_jul:jul_event\fP in the
-\fBlttng_jul_channel\fP. Using the lttng-ctl API, any JUL events must use the
-tracepoint event type (same as \-\-tracepoint).
+enabling events, you enable a Logger name that will then be mapped to a default
+UST tracepoint called \fBlttng_jul:<domain>_event\fP in the
+\fBlttng_<domain>_channel\fP. Using the lttng-ctl API, any JUL/LOG4J events
+must use the tracepoint event type (same as \-\-tracepoint).
-Because of the default immutable channel (\fBlttng_jul_channel\fP), the
-\fBenable-channel\fP command CAN NOT be used with the JUL domain thus not
-having any \-j option.
+Because of the default immutable channel, the \fBenable-channel\fP command CAN
+NOT be used with the JUL and LOG4J domain thus not having any options.
-For JUL event, loglevels are supported with the JUL ABI values. Use \fBlttng
-enable-event \-h\fP to list them. Wildcards are NOT supported except the "*"
-meaning all events (same as \-a).
+Also, loglevels are supported. Use \fBlttng enable-event \-h\fP to list them.
+Wildcards are NOT supported except the "*" meaning all events (same as \-a).
Exactly like the UST domain, if the Java application has the same UID as you,
you can trace it. Same goes for the tracing group accessing root applications.
-Finally, you can list every Logger name that are available from JUL registered
-applications to the session daemon by using \fBlttng list \-j\fP.
+Finally, you can list every Logger name that are available from registered
+applications to the session daemon by using \fBlttng list \-j\fP or \fB\-l\fP.
-Here is an example on how to use this domain.
+Here is an example on how to use the JUL domain.
.nf
$ lttng list -j
.PP
If you encounter any issues or usability problem, please report it on our
mailing list <lttng-dev@lists.lttng.org> to help improve this project or
-at https://bugs.lttng.org which is a bugtracker.
+at https://bugs.lttng.org which is a bug tracker.
.PP
.SH "CREDITS"
projects / lttng-tools.git / blobdiff