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From: "Tzvetomir Stoyanov (VMware)" <>
Subject: [PATCH 4/8] trace-cmd library: Document the API for log levels
Date: Wed, 28 Apr 2021 10:41:45 +0300
Message-ID: <> (raw)
In-Reply-To: <>

Updated trace-cmd library man pages with description of the API for
setting the library log levels:

Signed-off-by: Tzvetomir Stoyanov (VMware) <>
 Documentation/libtracecmd/libtracecmd-log.txt | 78 +++++++++++++++++++
 Documentation/libtracecmd/libtracecmd.txt     |  3 +
 2 files changed, 81 insertions(+)
 create mode 100644 Documentation/libtracecmd/libtracecmd-log.txt

diff --git a/Documentation/libtracecmd/libtracecmd-log.txt b/Documentation/libtracecmd/libtracecmd-log.txt
new file mode 100644
index 00000000..de5c2776
--- /dev/null
+++ b/Documentation/libtracecmd/libtracecmd-log.txt
@@ -0,0 +1,78 @@
+tracecmd_set_loglevel - Set log level of the library
+*#include <trace-cmd.h>*
+int *tracecmd_set_loglevel*(enum tep_loglevel _level_);
+The _tracecmd_set_loglevel()_ function sets the level of the library logs that will be printed on
+the console. See _libtraceevent(3)_ for detailed desciription of the log levels. Setting the log
+level to specific value means that logs from the previous levels will be printed too. For example
+_TEP_LOG_WARNING_ will print any logs with severity _TEP_LOG_WARNING_, _TEP_LOG_ERROR_ and
+_TEP_LOG_CRITICAL_. The default log level is _TEP_LOG_CRITICAL_.  When a new level is set, it is
+also propagated to the libtracefs and libtraceevent.
+#include <trace-cmd.h>
+/* call libtracecmd, libtracefs or libtraceevent APIs and observe any logs they produce */
+	Header file to include in order to have access to the library APIs.
+	Linker switch to add when building a program that uses the library.
+*Steven Rostedt* <>
+*Tzvetomir Stoyanov* <>
+Report bugs to  <>
+libtracecmd is Free Software licensed under the GNU LGPL 2.1
+Copyright \(C) 2021 VMware, Inc. Free use of this software is granted under
+the terms of the GNU Public License (GPL).
diff --git a/Documentation/libtracecmd/libtracecmd.txt b/Documentation/libtracecmd/libtracecmd.txt
index adc9321c..dc528ce0 100644
--- a/Documentation/libtracecmd/libtracecmd.txt
+++ b/Documentation/libtracecmd/libtracecmd.txt
@@ -33,6 +33,9 @@ Read tracing instances from a trace file:
 Get traceing peer information from a trace file:
 	unsigned long long *tracecmd_get_traceid*(struct tracecmd_input pass:[*]_handle_);
 	int *tracecmd_get_guest_cpumap*(struct tracecmd_input pass:[*]_handle_, unsigned long long _trace_id_, const char pass:[*]pass:[*]_name_, int pass:[*]_vcpu_count_, const int pass:[*]pass:[*]_cpu_pid_);
+Control library logs:
+	int *tracecmd_set_loglevel*(enum tep_loglevel _level_);

  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-28  7:41 [PATCH 0/8] Changes to trace-cmd logs Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 1/8] trace-cmd library: Use tep_vprint() for logs Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 2/8] trace-cmd library: Add tracecmd_info() log function Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 3/8] trace-cmd library: Add log levels Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` Tzvetomir Stoyanov (VMware) [this message]
2021-04-28  7:41 ` [PATCH 5/8] trace-cmd library: Renamed tracecmd_fatal() to tracecmd_critical() Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 6/8] trace-cmd library: Set debug log level in debug mode Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 7/8] trace-cmd report: Set the log level with -V and -q options Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 8/8] trace-cmd: Add new function to set log level Tzvetomir Stoyanov (VMware)

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