[PATCH 07/66] libtraceevent: Round up in tep_print_event() time precision

[PATCH 07/66] libtraceevent: Round up in tep_print_event() time precision

[Arnaldo Carvalho de Melo]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

When testing the output of the old trace-cmd compared to the one that
uses the updated tep_print_event() logic, it was different in that the
time stamp precision in the old format would round up to the nearest
precision, where as the new logic truncates. Bring back the old method
of rounding up.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: linux trace devel <linux-trace-devel@vger.kernel.org>
Link: http://lore.kernel.org/lkml/20190919165119.5efa5de6@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/event-parse.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 6f842af4550b..d948475585ce 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5527,8 +5527,10 @@ static void print_event_time(struct tep_handle *tep, struct trace_seq *s,
 	if (divstr && isdigit(*(divstr + 1)))
 		div = atoi(divstr + 1);
 	time = record->ts;
-	if (div)
+	if (div) {
+		time += div / 2;
 		time /= div;
+	}
 	pr = prec;
 	while (pr--)
 		p10 *= 10;
-- 
2.21.0

[PATCH 08/66] libtraceevent: Man pages for libtraceevent event print related API

[Arnaldo Carvalho de Melo]

From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

Added new man page, describing tep_print_event() libtraceevent API.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190801075012.22098-1-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190919212541.553160178@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 .../libtraceevent-event_print.txt             | 130 ++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-event_print.txt

diff --git a/tools/lib/traceevent/Documentation/libtraceevent-event_print.txt b/tools/lib/traceevent/Documentation/libtraceevent-event_print.txt
new file mode 100644
index 000000000000..2c6a61811118
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-event_print.txt
@@ -0,0 +1,130 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_print_event - Writes event information into a trace sequence.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *tep_print_event*(struct tep_handle pass:[*]_tep_, struct trace_seqpass:[*]_s_, struct tep_record pass:[*]_record_, const char pass:[*]_fmt_, _..._)
+--
+
+DESCRIPTION
+-----------
+
+The _tep_print_event()_ function parses the event information of the given
+_record_ and writes it into the trace sequence _s_, according to the format
+string _fmt_. The desired information is specified after the format string.
+The _fmt_ is printf-like format string, following arguments are supported:
+[verse]
+--
+	TEP_PRINT_PID, "%d"  - PID of the event.
+	TEP_PRINT_CPU, "%d"  - Event CPU.
+	TEP_PRINT_COMM, "%s" - Event command string.
+	TEP_PRINT_NAME, "%s" - Event name.
+	TEP_PRINT_LATENCY, "%s" - Latency of the event. It prints 4 or more
+			fields - interrupt state, scheduling state,
+			current context, and preemption count.
+			Field 1 is the interrupt enabled state:
+				d : Interrupts are disabled
+				. : Interrupts are enabled
+				X : The architecture does not support this
+				    information
+			Field 2 is the "need resched" state.
+				N : The task is set to call the scheduler when
+				    possible, as another higher priority task
+				    may need to be scheduled in.
+				. : The task is not set to call the scheduler.
+			Field 3 is the context state.
+				. : Normal context
+				s : Soft interrupt context
+				h : Hard interrupt context
+				H : Hard interrupt context which triggered
+				    during soft interrupt context.
+				z : NMI context
+				Z : NMI context which triggered during hard
+				    interrupt context
+			Field 4 is the preemption count.
+				. : The preempt count is zero.
+			On preemptible kernels (where the task can be scheduled
+			out in arbitrary locations while in kernel context), the
+			preempt count, when non zero, will prevent the kernel
+			from scheduling out the current task. The preempt count
+			number is displayed when it is not zero.
+			Depending on the kernel, it may show other fields
+			(lock depth, or migration disabled, which are unique to
+			specialized kernels).
+	TEP_PRINT_TIME, %d - event time stamp. A divisor and precision can be
+			specified as part of this format string:
+			"%precision.divisord". Example:
+			"%3.1000d" - divide the time by 1000 and print the first
+			3 digits before the dot. Thus, the time stamp
+			"123456000" will be printed as "123.456"
+	TEP_PRINT_INFO, "%s" - event information.
+	TEP_PRINT_INFO_RAW, "%s" - event information, in raw format.
+
+--
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+struct tep_handle *tep = tep_alloc();
+...
+void print_my_event(struct tep_record *record)
+{
+	trace_seq_reset(&seq);
+	tep_print_event(tep, s, record, "%16s-%-5d [%03d] %s %6.1000d %s %s",
+			TEP_PRINT_COMM, TEP_PRINT_PID, TEP_PRINT_CPU,
+			TEP_PRINT_LATENCY, TEP_PRINT_TIME, TEP_PRINT_NAME,
+			TEP_PRINT_INFO);
+}
+...
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+	Trace sequences are used to allow a function to call several other functions
+	to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtraceevent(3)_, _trace-cmd(1)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
-- 
2.21.0

[PATCH 09/66] libtraceevent: Man pages fix, rename tep_ref_get() to tep_get_ref()

[Arnaldo Carvalho de Melo]

From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>

The tep_ref_get() was renamed to tep_get_ref(), to be more consistent
with the other tep_ref_* APIs. However, in the man pages the API is
still with the old name. The documentation is fixed to reflect the
actual name of the API.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190808113636.13299-2-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190919212541.697034573@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 .../lib/traceevent/Documentation/libtraceevent-handle.txt | 8 ++++----
 tools/lib/traceevent/Documentation/libtraceevent.txt      | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/lib/traceevent/Documentation/libtraceevent-handle.txt b/tools/lib/traceevent/Documentation/libtraceevent-handle.txt
index 8d568316847d..45b20172e262 100644
--- a/tools/lib/traceevent/Documentation/libtraceevent-handle.txt
+++ b/tools/lib/traceevent/Documentation/libtraceevent-handle.txt
@@ -3,7 +3,7 @@ libtraceevent(3)
 
 NAME
 ----
-tep_alloc, tep_free,tep_ref, tep_unref,tep_ref_get - Create, destroy, manage
+tep_alloc, tep_free,tep_ref, tep_unref,tep_get_ref - Create, destroy, manage
 references of trace event parser context.
 
 SYNOPSIS
@@ -16,7 +16,7 @@ struct tep_handle pass:[*]*tep_alloc*(void);
 void *tep_free*(struct tep_handle pass:[*]_tep_);
 void *tep_ref*(struct tep_handle pass:[*]_tep_);
 void *tep_unref*(struct tep_handle pass:[*]_tep_);
-int *tep_ref_get*(struct tep_handle pass:[*]_tep_);
+int *tep_get_ref*(struct tep_handle pass:[*]_tep_);
 --
 
 DESCRIPTION
@@ -57,9 +57,9 @@ EXAMPLE
 ...
 struct tep_handle *tep = tep_alloc();
 ...
-int ref = tep_ref_get(tep);
+int ref = tep_get_ref(tep);
 tep_ref(tep);
-if ( (ref+1) != tep_ref_get(tep)) {
+if ( (ref+1) != tep_get_ref(tep)) {
 	/* Something wrong happened, the counter is not incremented by 1 */
 }
 tep_unref(tep);
diff --git a/tools/lib/traceevent/Documentation/libtraceevent.txt b/tools/lib/traceevent/Documentation/libtraceevent.txt
index fbd977b47de1..00519503c8de 100644
--- a/tools/lib/traceevent/Documentation/libtraceevent.txt
+++ b/tools/lib/traceevent/Documentation/libtraceevent.txt
@@ -16,7 +16,7 @@ Management of tep handler data structure and access of its members:
 	void *tep_free*(struct tep_handle pass:[*]_tep_);
 	void *tep_ref*(struct tep_handle pass:[*]_tep_);
 	void *tep_unref*(struct tep_handle pass:[*]_tep_);
-	int *tep_ref_get*(struct tep_handle pass:[*]_tep_);
+	int *tep_get_ref*(struct tep_handle pass:[*]_tep_);
 	void *tep_set_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
 	void *tep_clear_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flag_);
 	bool *tep_test_flag*(struct tep_handle pass:[*]_tep_, enum tep_flag _flags_);
-- 
2.21.0

[PATCH 10/66] libtraceevent: Man pages fix, changes in event printing APIs

[Arnaldo Carvalho de Melo]

From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>

APIs for printing various trace event information were redesigned to be
more simple. However, the main libtraceevent man page was not updated
with those changes. The documentation is updated to describe the new
event print API.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190808113636.13299-3-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190919212541.869643036@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 .../lib/traceevent/Documentation/libtraceevent.txt  | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/tools/lib/traceevent/Documentation/libtraceevent.txt b/tools/lib/traceevent/Documentation/libtraceevent.txt
index 00519503c8de..d530a7ce8fb2 100644
--- a/tools/lib/traceevent/Documentation/libtraceevent.txt
+++ b/tools/lib/traceevent/Documentation/libtraceevent.txt
@@ -26,15 +26,12 @@ Management of tep handler data structure and access of its members:
 	void *tep_set_long_size*(struct tep_handle pass:[*]_tep_, int _long_size_);
 	int *tep_get_page_size*(struct tep_handle pass:[*]_tep_);
 	void *tep_set_page_size*(struct tep_handle pass:[*]_tep_, int _page_size_);
-	bool *tep_is_latency_format*(struct tep_handle pass:[*]_tep_);
-	void *tep_set_latency_format*(struct tep_handle pass:[*]_tep_, int _lat_);
 	int *tep_get_header_page_size*(struct tep_handle pass:[*]_tep_);
 	int *tep_get_header_timestamp_size*(struct tep_handle pass:[*]_tep_);
 	bool *tep_is_old_format*(struct tep_handle pass:[*]_tep_);
 	int *tep_strerror*(struct tep_handle pass:[*]_tep_, enum tep_errno _errnum_, char pass:[*]_buf_, size_t _buflen_);
 
 Register / unregister APIs:
-	int *tep_register_trace_clock*(struct tep_handle pass:[*]_tep_, const char pass:[*]_trace_clock_);
 	int *tep_register_function*(struct tep_handle pass:[*]_tep_, char pass:[*]_name_, unsigned long long _addr_, char pass:[*]_mod_);
 	int *tep_register_event_handler*(struct tep_handle pass:[*]_tep_, int _id_, const char pass:[*]_sys_name_, const char pass:[*]_event_name_, tep_event_handler_func _func_, void pass:[*]_context_);
 	int *tep_unregister_event_handler*(struct tep_handle pass:[*]tep, int id, const char pass:[*]sys_name, const char pass:[*]event_name, tep_event_handler_func func, void pass:[*]_context_);
@@ -57,14 +54,7 @@ Event related APIs:
 	int *tep_get_events_count*(struct tep_handle pass:[*]_tep_);
 	struct tep_event pass:[*]pass:[*]*tep_list_events*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
 	struct tep_event pass:[*]pass:[*]*tep_list_events_copy*(struct tep_handle pass:[*]_tep_, enum tep_event_sort_type _sort_type_);
-
-Event printing:
-	void *tep_print_event*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, bool _use_trace_clock_);
-	void *tep_print_event_data*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, struct tep_record pass:[*]_record_);
-	void *tep_event_info*(struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, struct tep_record pass:[*]_record_);
-	void *tep_print_event_task*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, struct tep_record pass:[*]_record_);
-	void *tep_print_event_time*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_event pass:[*]_event_, struct tep_record pass:[*]record, bool _use_trace_clock_);
-	void *tep_set_print_raw*(struct tep_handle pass:[*]_tep_, int _print_raw_);
+	void *tep_print_event*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_, const char pass:[*]_fmt_, _..._);
 
 Event finding:
 	struct tep_event pass:[*]*tep_find_event*(struct tep_handle pass:[*]_tep_, int _id_);
@@ -116,7 +106,6 @@ Filter management:
 	int *tep_filter_compare*(struct tep_event_filter pass:[*]_filter1_, struct tep_event_filter pass:[*]_filter2_);
 
 Parsing various data from the records:
-	void *tep_data_latency_format*(struct tep_handle pass:[*]_tep_, struct trace_seq pass:[*]_s_, struct tep_record pass:[*]_record_);
 	int *tep_data_type*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
 	int *tep_data_pid*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
 	int *tep_data_preempt_count*(struct tep_handle pass:[*]_tep_, struct tep_record pass:[*]_rec_);
-- 
2.21.0

[PATCH 11/66] libtraceevent: Add tep_get_event() in event-parse.h

[Arnaldo Carvalho de Melo]

From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>

The tep_get_event() function is an official libtracevent API, described
in the library man pages. However, it cannot be used by the library users because
it is not declared in the event-parse.h file, where all libtracevent APIs are.
The function declaration is added in event-parse.h file.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190808113721.13539-1-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190919212542.058025937@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/event-parse.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index d438ee44289f..b77837f75a0d 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -441,6 +441,8 @@ int tep_register_print_string(struct tep_handle *tep, const char *fmt,
 			      unsigned long long addr);
 bool tep_is_pid_registered(struct tep_handle *tep, int pid);
 
+struct tep_event *tep_get_event(struct tep_handle *tep, int index);
+
 #define TEP_PRINT_INFO		"INFO"
 #define TEP_PRINT_INFO_RAW	"INFO_RAW"
 #define TEP_PRINT_COMM		"COMM"
-- 
2.21.0

[PATCH 12/66] libtraceevent: Move traceevent plugins in its own subdirectory

[Arnaldo Carvalho de Melo]

From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>

All traceevent plugins code is moved to tools/lib/traceevent/plugins
subdirectory. It makes traceevent implementation in trace-cmd and in
kernel tree consistent. There is no changes in the way libtraceevent and
plugins are compiled and installed.

Committer notes:

Applied fixup provided by Steven, fixing the tools/perf/Makefile.perf
target for the plugin dynamic list file. Problem noticed when cross
building to aarch64 from a Ubuntu 19.04 container.

Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20190923115929.453b68f1@oasis.local.home
Link: http://lore.kernel.org/lkml/20190919212542.377333393@goodmis.org
Link: http://lore.kernel.org/linux-trace-devel/20190917105055.18983-1-tz.stoyanov@gmail.com
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/traceevent/Build                    |  11 -
 tools/lib/traceevent/Makefile                 |  94 ++------
 tools/lib/traceevent/plugins/Build            |  10 +
 tools/lib/traceevent/plugins/Makefile         | 222 ++++++++++++++++++
 .../{ => plugins}/plugin_cfg80211.c           |   0
 .../{ => plugins}/plugin_function.c           |   0
 .../traceevent/{ => plugins}/plugin_hrtimer.c |   0
 .../traceevent/{ => plugins}/plugin_jbd2.c    |   0
 .../traceevent/{ => plugins}/plugin_kmem.c    |   0
 .../lib/traceevent/{ => plugins}/plugin_kvm.c |   0
 .../{ => plugins}/plugin_mac80211.c           |   0
 .../{ => plugins}/plugin_sched_switch.c       |   0
 .../traceevent/{ => plugins}/plugin_scsi.c    |   0
 .../lib/traceevent/{ => plugins}/plugin_xen.c |   0
 tools/perf/Makefile.perf                      |   4 +-
 15 files changed, 250 insertions(+), 91 deletions(-)
 create mode 100644 tools/lib/traceevent/plugins/Build
 create mode 100644 tools/lib/traceevent/plugins/Makefile
 rename tools/lib/traceevent/{ => plugins}/plugin_cfg80211.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_function.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_hrtimer.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_jbd2.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_kmem.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_kvm.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_mac80211.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_sched_switch.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_scsi.c (100%)
 rename tools/lib/traceevent/{ => plugins}/plugin_xen.c (100%)

diff --git a/tools/lib/traceevent/Build b/tools/lib/traceevent/Build
index ba54bfce0b0b..f9a5d79578f5 100644
--- a/tools/lib/traceevent/Build
+++ b/tools/lib/traceevent/Build
@@ -6,14 +6,3 @@ libtraceevent-y += parse-utils.o
 libtraceevent-y += kbuffer-parse.o
 libtraceevent-y += tep_strerror.o
 libtraceevent-y += event-parse-api.o
-
-plugin_jbd2-y         += plugin_jbd2.o
-plugin_hrtimer-y      += plugin_hrtimer.o
-plugin_kmem-y         += plugin_kmem.o
-plugin_kvm-y          += plugin_kvm.o
-plugin_mac80211-y     += plugin_mac80211.o
-plugin_sched_switch-y += plugin_sched_switch.o
-plugin_function-y     += plugin_function.o
-plugin_xen-y          += plugin_xen.o
-plugin_scsi-y         += plugin_scsi.o
-plugin_cfg80211-y     += plugin_cfg80211.o
diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
index a39cdd0d890d..5315f3787f8d 100644
--- a/tools/lib/traceevent/Makefile
+++ b/tools/lib/traceevent/Makefile
@@ -58,30 +58,6 @@ export man_dir man_dir_SQ INSTALL
 export DESTDIR DESTDIR_SQ
 export EVENT_PARSE_VERSION
 
-set_plugin_dir := 1
-
-# Set plugin_dir to preffered global plugin location
-# If we install under $HOME directory we go under
-# $(HOME)/.local/lib/traceevent/plugins
-#
-# We dont set PLUGIN_DIR in case we install under $HOME
-# directory, because by default the code looks under:
-# $(HOME)/.local/lib/traceevent/plugins by default.
-#
-ifeq ($(plugin_dir),)
-ifeq ($(prefix),$(HOME))
-override plugin_dir = $(HOME)/.local/lib/traceevent/plugins
-set_plugin_dir := 0
-else
-override plugin_dir = $(libdir)/traceevent/plugins
-endif
-endif
-
-ifeq ($(set_plugin_dir),1)
-PLUGIN_DIR = -DPLUGIN_DIR="$(plugin_dir)"
-PLUGIN_DIR_SQ = '$(subst ','\'',$(PLUGIN_DIR))'
-endif
-
 include ../../scripts/Makefile.include
 
 # copy a bit from Linux kbuild
@@ -105,7 +81,6 @@ export prefix libdir src obj
 # Shell quotes
 libdir_SQ = $(subst ','\'',$(libdir))
 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
-plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
 
 CONFIG_INCLUDES = 
 CONFIG_LIBS	=
@@ -151,29 +126,14 @@ MAKEOVERRIDES=
 export srctree OUTPUT CC LD CFLAGS V
 build := -f $(srctree)/tools/build/Makefile.build dir=. obj
 
-PLUGINS  = plugin_jbd2.so
-PLUGINS += plugin_hrtimer.so
-PLUGINS += plugin_kmem.so
-PLUGINS += plugin_kvm.so
-PLUGINS += plugin_mac80211.so
-PLUGINS += plugin_sched_switch.so
-PLUGINS += plugin_function.so
-PLUGINS += plugin_xen.so
-PLUGINS += plugin_scsi.so
-PLUGINS += plugin_cfg80211.so
-
-PLUGINS    := $(addprefix $(OUTPUT),$(PLUGINS))
-PLUGINS_IN := $(PLUGINS:.so=-in.o)
-
 TE_IN      := $(OUTPUT)libtraceevent-in.o
 LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
-DYNAMIC_LIST_FILE := $(OUTPUT)libtraceevent-dynamic-list
 
-CMD_TARGETS = $(LIB_TARGET) $(PLUGINS) $(DYNAMIC_LIST_FILE)
+CMD_TARGETS = $(LIB_TARGET)
 
 TARGETS = $(CMD_TARGETS)
 
-all: all_cmd
+all: all_cmd plugins
 
 all_cmd: $(CMD_TARGETS)
 
@@ -188,17 +148,6 @@ $(OUTPUT)libtraceevent.so.$(EVENT_PARSE_VERSION): $(TE_IN)
 $(OUTPUT)libtraceevent.a: $(TE_IN)
 	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
 
-$(OUTPUT)libtraceevent-dynamic-list: $(PLUGINS)
-	$(QUIET_GEN)$(call do_generate_dynamic_list_file, $(PLUGINS), $@)
-
-plugins: $(PLUGINS)
-
-__plugin_obj = $(notdir $@)
-  plugin_obj = $(__plugin_obj:-in.o=)
-
-$(PLUGINS_IN): force
-	$(Q)$(MAKE) $(build)=$(plugin_obj)
-
 $(OUTPUT)%.so: $(OUTPUT)%-in.o
 	$(QUIET_LINK)$(CC) $(CFLAGS) -shared $(LDFLAGS) -nostartfiles -o $@ $^
 
@@ -258,25 +207,6 @@ define do_install
 	$(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
 endef
 
-define do_install_plugins
-	for plugin in $1; do				\
-	  $(call do_install,$$plugin,$(plugin_dir_SQ));	\
-	done
-endef
-
-define do_generate_dynamic_list_file
-	symbol_type=`$(NM) -u -D $1 | awk 'NF>1 {print $$1}' | \
-	xargs echo "U w W" | tr 'w ' 'W\n' | sort -u | xargs echo`;\
-	if [ "$$symbol_type" = "U W" ];then				\
-		(echo '{';						\
-		$(NM) -u -D $1 | awk 'NF>1 {print "\t"$$2";"}' | sort -u;\
-		echo '};';						\
-		) > $2;							\
-	else								\
-		(echo Either missing one of [$1] or bad version of $(NM)) 1>&2;\
-	fi
-endef
-
 PKG_CONFIG_FILE = libtraceevent.pc
 define do_install_pkgconfig_file
 	if [ -n "${pkgconfig_dir}" ]; then 					\
@@ -296,10 +226,6 @@ install_lib: all_cmd install_plugins install_headers install_pkgconfig
 		$(call do_install_mkdir,$(libdir_SQ)); \
 		cp -fpR $(LIB_INSTALL) $(DESTDIR)$(libdir_SQ)
 
-install_plugins: $(PLUGINS)
-	$(call QUIET_INSTALL, trace_plugins) \
-		$(call do_install_plugins, $(PLUGINS))
-
 install_pkgconfig:
 	$(call QUIET_INSTALL, $(PKG_CONFIG_FILE)) \
 		$(call do_install_pkgconfig_file,$(prefix))
@@ -313,7 +239,7 @@ install_headers:
 
 install: install_lib
 
-clean:
+clean: clean_plugins
 	$(call QUIET_CLEAN, libtraceevent) \
 		$(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd; \
 		$(RM) TRACEEVENT-CFLAGS tags TAGS; \
@@ -351,7 +277,19 @@ help:
 	@echo '  doc-install         - install the man pages'
 	@echo '  doc-uninstall       - uninstall the man pages'
 	@echo''
-PHONY += force plugins
+
+PHONY += plugins
+plugins:
+	$(call descend,plugins)
+
+PHONY += install_plugins
+install_plugins:
+	$(call descend,plugins,install)
+
+PHONY += clean_plugins
+clean_plugins:
+	$(call descend,plugins,clean)
+
 force:
 
 # Declare the contents of the .PHONY variable as phony.  We keep that
diff --git a/tools/lib/traceevent/plugins/Build b/tools/lib/traceevent/plugins/Build
new file mode 100644
index 000000000000..210d26910613
--- /dev/null
+++ b/tools/lib/traceevent/plugins/Build
@@ -0,0 +1,10 @@
+plugin_jbd2-y         += plugin_jbd2.o
+plugin_hrtimer-y      += plugin_hrtimer.o
+plugin_kmem-y         += plugin_kmem.o
+plugin_kvm-y          += plugin_kvm.o
+plugin_mac80211-y     += plugin_mac80211.o
+plugin_sched_switch-y += plugin_sched_switch.o
+plugin_function-y     += plugin_function.o
+plugin_xen-y          += plugin_xen.o
+plugin_scsi-y         += plugin_scsi.o
+plugin_cfg80211-y     += plugin_cfg80211.o
diff --git a/tools/lib/traceevent/plugins/Makefile b/tools/lib/traceevent/plugins/Makefile
new file mode 100644
index 000000000000..f440989fa55e
--- /dev/null
+++ b/tools/lib/traceevent/plugins/Makefile
@@ -0,0 +1,222 @@
+# SPDX-License-Identifier: GPL-2.0
+
+#MAKEFLAGS += --no-print-directory
+
+
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+$(call allow-override,AR,$(CROSS_COMPILE)ar)
+$(call allow-override,NM,$(CROSS_COMPILE)nm)
+$(call allow-override,PKG_CONFIG,pkg-config)
+
+EXT = -std=gnu99
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
+ifeq ($(LP64), 1)
+  libdir_relative = lib64
+else
+  libdir_relative = lib
+endif
+
+prefix ?= /usr/local
+libdir = $(prefix)/$(libdir_relative)
+
+set_plugin_dir := 1
+
+# Set plugin_dir to preffered global plugin location
+# If we install under $HOME directory we go under
+# $(HOME)/.local/lib/traceevent/plugins
+#
+# We dont set PLUGIN_DIR in case we install under $HOME
+# directory, because by default the code looks under:
+# $(HOME)/.local/lib/traceevent/plugins by default.
+#
+ifeq ($(plugin_dir),)
+ifeq ($(prefix),$(HOME))
+override plugin_dir = $(HOME)/.local/lib/traceevent/plugins
+set_plugin_dir := 0
+else
+override plugin_dir = $(libdir)/traceevent/plugins
+endif
+endif
+
+ifeq ($(set_plugin_dir),1)
+PLUGIN_DIR = -DPLUGIN_DIR="$(plugin_dir)"
+PLUGIN_DIR_SQ = '$(subst ','\'',$(PLUGIN_DIR))'
+endif
+
+include ../../../scripts/Makefile.include
+
+# copy a bit from Linux kbuild
+
+ifeq ("$(origin V)", "command line")
+  VERBOSE = $(V)
+endif
+ifndef VERBOSE
+  VERBOSE = 0
+endif
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+#$(info Determined 'srctree' to be $(srctree))
+endif
+
+export prefix libdir src obj
+
+# Shell quotes
+plugin_dir_SQ = $(subst ','\'',$(plugin_dir))
+
+CONFIG_INCLUDES =
+CONFIG_LIBS    =
+CONFIG_FLAGS   =
+
+OBJ            = $@
+N              =
+
+INCLUDES = -I. -I.. -I $(srctree)/tools/include $(CONFIG_INCLUDES)
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+  CFLAGS := $(EXTRA_CFLAGS)
+else
+  CFLAGS := -g -Wall
+endif
+
+# Append required CFLAGS
+override CFLAGS += -fPIC
+override CFLAGS += $(CONFIG_FLAGS) $(INCLUDES) $(PLUGIN_DIR_SQ)
+override CFLAGS += $(udis86-flags) -D_GNU_SOURCE
+
+ifeq ($(VERBOSE),1)
+  Q =
+else
+  Q = @
+endif
+
+# Disable command line variables (CFLAGS) override from top
+# level Makefile (perf), otherwise build Makefile will get
+# the same command line setup.
+MAKEOVERRIDES=
+
+export srctree OUTPUT CC LD CFLAGS V
+
+build := -f $(srctree)/tools/build/Makefile.build dir=. obj
+
+DYNAMIC_LIST_FILE := $(OUTPUT)libtraceevent-dynamic-list
+
+PLUGINS  = plugin_jbd2.so
+PLUGINS += plugin_hrtimer.so
+PLUGINS += plugin_kmem.so
+PLUGINS += plugin_kvm.so
+PLUGINS += plugin_mac80211.so
+PLUGINS += plugin_sched_switch.so
+PLUGINS += plugin_function.so
+PLUGINS += plugin_xen.so
+PLUGINS += plugin_scsi.so
+PLUGINS += plugin_cfg80211.so
+
+PLUGINS    := $(addprefix $(OUTPUT),$(PLUGINS))
+PLUGINS_IN := $(PLUGINS:.so=-in.o)
+
+plugins: $(PLUGINS) $(DYNAMIC_LIST_FILE)
+
+__plugin_obj = $(notdir $@)
+  plugin_obj = $(__plugin_obj:-in.o=)
+
+$(PLUGINS_IN): force
+	$(Q)$(MAKE) $(build)=$(plugin_obj)
+
+$(OUTPUT)libtraceevent-dynamic-list: $(PLUGINS)
+	$(QUIET_GEN)$(call do_generate_dynamic_list_file, $(PLUGINS), $@)
+
+$(OUTPUT)%.so: $(OUTPUT)%-in.o
+	$(QUIET_LINK)$(CC) $(CFLAGS) -shared $(LDFLAGS) -nostartfiles -o $@ $^
+
+define update_dir
+  (echo $1 > $@.tmp;                           \
+   if [ -r $@ ] && cmp -s $@ $@.tmp; then      \
+     rm -f $@.tmp;                             \
+   else                                                \
+     echo '  UPDATE                 $@';       \
+     mv -f $@.tmp $@;                          \
+   fi);
+endef
+
+tags:	force
+	$(RM) tags
+	find . -name '*.[ch]' | xargs ctags --extra=+f --c-kinds=+px \
+	--regex-c++='/_PE\(([^,)]*).*/TEP_ERRNO__\1/'
+
+TAGS:	force
+	$(RM) TAGS
+	find . -name '*.[ch]' | xargs etags \
+	--regex='/_PE(\([^,)]*\).*/TEP_ERRNO__\1/'
+
+define do_install_mkdir
+	if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
+	fi
+endef
+
+define do_install
+	$(call do_install_mkdir,$2);                    \
+	$(INSTALL) $(if $3,-m $3,) $1 '$(DESTDIR_SQ)$2'
+endef
+
+define do_install_plugins
+       for plugin in $1; do                            \
+         $(call do_install,$$plugin,$(plugin_dir_SQ)); \
+       done
+endef
+
+define do_generate_dynamic_list_file
+	symbol_type=`$(NM) -u -D $1 | awk 'NF>1 {print $$1}' | \
+	xargs echo "U w W" | tr 'w ' 'W\n' | sort -u | xargs echo`;\
+	if [ "$$symbol_type" = "U W" ];then				\
+		(echo '{';                                              \
+		$(NM) -u -D $1 | awk 'NF>1 {print "\t"$$2";"}' | sort -u;\
+		echo '};';                                              \
+		) > $2;                                                 \
+	else                                                            \
+		(echo Either missing one of [$1] or bad version of $(NM)) 1>&2;\
+		fi
+endef
+
+install: $(PLUGINS)
+	$(call QUIET_INSTALL, trace_plugins) \
+	$(call do_install_plugins, $(PLUGINS))
+
+clean:
+	$(call QUIET_CLEAN, trace_plugins) \
+		$(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d .*.cmd; \
+		$(RM) $(OUTPUT)libtraceevent-dynamic-list \
+		$(RM) TRACEEVENT-CFLAGS tags TAGS;
+
+PHONY += force plugins
+force:
+
+# Declare the contents of the .PHONY variable as phony.  We keep that
+# information in a variable so we can use it in if_changed and friends.
+.PHONY: $(PHONY)
diff --git a/tools/lib/traceevent/plugin_cfg80211.c b/tools/lib/traceevent/plugins/plugin_cfg80211.c
similarity index 100%
rename from tools/lib/traceevent/plugin_cfg80211.c
rename to tools/lib/traceevent/plugins/plugin_cfg80211.c
diff --git a/tools/lib/traceevent/plugin_function.c b/tools/lib/traceevent/plugins/plugin_function.c
similarity index 100%
rename from tools/lib/traceevent/plugin_function.c
rename to tools/lib/traceevent/plugins/plugin_function.c
diff --git a/tools/lib/traceevent/plugin_hrtimer.c b/tools/lib/traceevent/plugins/plugin_hrtimer.c
similarity index 100%
rename from tools/lib/traceevent/plugin_hrtimer.c
rename to tools/lib/traceevent/plugins/plugin_hrtimer.c
diff --git a/tools/lib/traceevent/plugin_jbd2.c b/tools/lib/traceevent/plugins/plugin_jbd2.c
similarity index 100%
rename from tools/lib/traceevent/plugin_jbd2.c
rename to tools/lib/traceevent/plugins/plugin_jbd2.c
diff --git a/tools/lib/traceevent/plugin_kmem.c b/tools/lib/traceevent/plugins/plugin_kmem.c
similarity index 100%
rename from tools/lib/traceevent/plugin_kmem.c
rename to tools/lib/traceevent/plugins/plugin_kmem.c
diff --git a/tools/lib/traceevent/plugin_kvm.c b/tools/lib/traceevent/plugins/plugin_kvm.c
similarity index 100%
rename from tools/lib/traceevent/plugin_kvm.c
rename to tools/lib/traceevent/plugins/plugin_kvm.c
diff --git a/tools/lib/traceevent/plugin_mac80211.c b/tools/lib/traceevent/plugins/plugin_mac80211.c
similarity index 100%
rename from tools/lib/traceevent/plugin_mac80211.c
rename to tools/lib/traceevent/plugins/plugin_mac80211.c
diff --git a/tools/lib/traceevent/plugin_sched_switch.c b/tools/lib/traceevent/plugins/plugin_sched_switch.c
similarity index 100%
rename from tools/lib/traceevent/plugin_sched_switch.c
rename to tools/lib/traceevent/plugins/plugin_sched_switch.c
diff --git a/tools/lib/traceevent/plugin_scsi.c b/tools/lib/traceevent/plugins/plugin_scsi.c
similarity index 100%
rename from tools/lib/traceevent/plugin_scsi.c
rename to tools/lib/traceevent/plugins/plugin_scsi.c
diff --git a/tools/lib/traceevent/plugin_xen.c b/tools/lib/traceevent/plugins/plugin_xen.c
similarity index 100%
rename from tools/lib/traceevent/plugin_xen.c
rename to tools/lib/traceevent/plugins/plugin_xen.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 2ccc12f3730b..902c792f326a 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -292,7 +292,7 @@ endif
 LIBTRACEEVENT = $(TE_PATH)libtraceevent.a
 export LIBTRACEEVENT
 
-LIBTRACEEVENT_DYNAMIC_LIST = $(TE_PATH)libtraceevent-dynamic-list
+LIBTRACEEVENT_DYNAMIC_LIST = $(TE_PATH)plugins/libtraceevent-dynamic-list
 
 #
 # The static build has no dynsym table, so this does not work for
@@ -737,7 +737,7 @@ libtraceevent_plugins: FORCE
 	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) plugins
 
 $(LIBTRACEEVENT_DYNAMIC_LIST): libtraceevent_plugins
-	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)libtraceevent-dynamic-list
+	$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) $(OUTPUT)plugins/libtraceevent-dynamic-list
 
 $(LIBTRACEEVENT)-clean:
 	$(call QUIET_CLEAN, libtraceevent)
-- 
2.21.0

[PATCH 13/66] libtraceevent: Man pages for tep plugins APIs

[Arnaldo Carvalho de Melo]

From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

Create man pages for libtraceevent APIs:

  tep_load_plugins(),
  tep_unload_plugin()

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190903133434.30417-1-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190919212542.216189588@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 .../Documentation/libtraceevent-plugins.txt   | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-plugins.txt

diff --git a/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
new file mode 100644
index 000000000000..596032ade31f
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
@@ -0,0 +1,99 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_load_plugins, tep_unload_plugins - Load / unload traceevent plugins.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+struct tep_plugin_list pass:[*]*tep_load_plugins*(struct tep_handle pass:[*]_tep_);
+void *tep_unload_plugins*(struct tep_plugin_list pass:[*]_plugin_list_, struct tep_handle pass:[*]_tep_);
+--
+
+DESCRIPTION
+-----------
+The _tep_load_plugins()_ function loads all plugins, located in the plugin
+directories. The _tep_ argument is trace event parser context.
+The plugin directories are :
+[verse]
+--
+	- System's plugin directory, defined at the library compile time. It
+	  depends on the library installation prefix and usually is
+	  _(install_preffix)/lib/traceevent/plugins_
+	- Directory, defined by the environment variable _TRACEEVENT_PLUGIN_DIR_
+	- User's plugin directory, located at _~/.local/lib/traceevent/plugins_
+--
+Loading of plugins can be controlled by the _tep_flags_, using the
+_tep_set_flag()_ API:
+[verse]
+--
+	_TEP_DISABLE_SYS_PLUGINS_	- do not load plugins, located in
+					the system's plugin directory.
+	_TEP_DISABLE_PLUGINS_		- do not load any plugins.
+--
+The _tep_set_flag()_ API needs to be called before _tep_load_plugins()_, if
+loading of all plugins is not the desired case.
+
+The _tep_unload_plugins()_ function unloads the plugins, previously loaded by
+_tep_load_plugins()_. The _tep_ argument is trace event parser context. The
+_plugin_list_ is the list of loaded plugins, returned by
+the _tep_load_plugins()_ function.
+
+RETURN VALUE
+------------
+The _tep_load_plugins()_ function returns a list of successfully loaded plugins,
+or NULL in case no plugins are loaded.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct tep_plugin_list *plugins = tep_load_plugins(tep);
+if (plugins == NULL) {
+	/* no plugins are loaded */
+}
+...
+tep_unload_plugins(plugins, tep);
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtraceevent(3)_, _trace-cmd(1)_, _tep_set_flag(3)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
-- 
2.21.0