Linux-Trace-Devel Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v3 0/2] libtracefs man pages
@ 2020-12-22  4:53 Tzvetomir Stoyanov (VMware)
  2020-12-22  4:53 ` [PATCH v3 1/2] libtracefs man pages: APIs for initializing a tep handler with trace events from the local system Tzvetomir Stoyanov (VMware)
  2020-12-22  4:53 ` [PATCH v3 2/2] libtracefs man pages: helper APIs for working with trace file system Tzvetomir Stoyanov (VMware)
  0 siblings, 2 replies; 3+ messages in thread
From: Tzvetomir Stoyanov (VMware) @ 2020-12-22  4:53 UTC (permalink / raw)
  To: rostedt; +Cc: linux-trace-devel

Initial implementation of libtracefs man pages.

v3 changes:
 - Removed accpeted patches from the set.
 - Fixed description of the tracing_dir parameter, to be the same
   in all man pages.
 - Removed "<event-parse.h>" includes.

v2 changes:
 - Removed tracefs_find_tracing_dir() API
 - Renamed tracefs_get_tracing_dir() to tracefs_tracing_dir()
 - Removed any references to "#include <event-parse.h>"
 - Rewrote some descriptions, as suggested by Steven.

Tzvetomir Stoyanov (VMware) (2):
  libtracefs man pages: APIs for initializing a tep handler with trace
    events from the local system.
  libtracefs man pages: helper APIs for working with trace file system.

 Documentation/libtracefs-events-tep.txt | 130 ++++++++++++++++++++++++
 Documentation/libtracefs-utils.txt      | 103 +++++++++++++++++++
 2 files changed, 233 insertions(+)
 create mode 100644 Documentation/libtracefs-events-tep.txt
 create mode 100644 Documentation/libtracefs-utils.txt

-- 
2.28.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH v3 1/2] libtracefs man pages: APIs for initializing a tep handler with trace events from the local system.
  2020-12-22  4:53 [PATCH v3 0/2] libtracefs man pages Tzvetomir Stoyanov (VMware)
@ 2020-12-22  4:53 ` Tzvetomir Stoyanov (VMware)
  2020-12-22  4:53 ` [PATCH v3 2/2] libtracefs man pages: helper APIs for working with trace file system Tzvetomir Stoyanov (VMware)
  1 sibling, 0 replies; 3+ messages in thread
From: Tzvetomir Stoyanov (VMware) @ 2020-12-22  4:53 UTC (permalink / raw)
  To: rostedt; +Cc: linux-trace-devel

Documented APIs:
tracefs_local_events()
tracefs_local_events_system()
tracefs_fill_local_events()

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 Documentation/libtracefs-events-tep.txt | 130 ++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 Documentation/libtracefs-events-tep.txt

diff --git a/Documentation/libtracefs-events-tep.txt b/Documentation/libtracefs-events-tep.txt
new file mode 100644
index 0000000..f7d7a61
--- /dev/null
+++ b/Documentation/libtracefs-events-tep.txt
@@ -0,0 +1,130 @@
+libtracefs(3)
+=============
+
+NAME
+----
+tracefs_local_events, tracefs_local_events_system, tracefs_fill_local_events -
+Initialize a tep handler with trace events from the local system.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <tracefs.h>*
+
+struct tep_handle pass:[*]*tracefs_local_events*(const char pass:[*]_tracing_dir_);
+struct tep_handle pass:[*]*tracefs_local_events_system*(const char pass:[*]_tracing_dir_, const char pass:[*] const pass:[*]_sys_names_);
+int *tracefs_fill_local_events*(const char pass:[*]_tracing_dir_, struct tep_handle pass:[*]_tep_, int pass:[*]_parsing_failures_);
+
+--
+
+DESCRIPTION
+-----------
+Functions for initializing a tep handler with trace events from the local system.
+
+The _tracefs_local_events()_ function allocates a new _tep_ handler and
+initializes it with events from all trace systems, located in the given
+_tracing_dir_ directory. This could be NULL or the location of the tracefs
+mount point for the trace systems of the local machine, or it may be a path
+to a copy of the tracefs directory from another machine.
+
+The _tracefs_local_events_system()_ function allocates a new _tep_ handler
+and initializes it with events from specified trace systems _sys_names_,
+located in the given _tracing_dir_ directory. This could be NULL or the
+location of the tracefs mount point for the trace systems of the local
+machine, or it may be a path to a copy of the tracefs directory from another
+machine. The _sys_names_ argument is an array of trace system names, that
+will be used for _tep_ handler initialization. The last element in that
+array must be a NULL pointer.
+
+The _tracefs_fill_local_events()_ function initializes already allocated _tep_
+handler with events from all trace systems, located in the given _tracing_dir_
+directory. This could be NULL or the location of the tracefs mount point
+for the trace systems of the local machine, or it may be a path to a copy
+of the tracefs directory from another machine. The _tep_ argument must be
+a pointer to already allocated tep handler, that is going to be initialized.
+The _parsing_failures_ argument could be NULL or a pointer to an integer,
+where the number of failures while parsing the event files are returned.
+
+RETURN VALUE
+------------
+The _tracefs_local_events()_ and _tracefs_local_events_system()_ functions
+return pointer to allocated and initialized _tep_ handler, or NULL in
+case of an error. The returned _tep_ handler must be freed with _tep_free(3)_.
+
+The _tracefs_fill_local_events()_ function returns -1 in case of an error or
+0 otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <tracefs.h>
+
+struct tep_event *tep;
+...
+	tep = tracefs_local_events(NULL);
+	if (!tep) {
+		/* Failed to initialise tep handler with local events from top instance */
+		...
+	}
+...
+	tep_free(tep);
+...
+	const char *systems[] = {"ftrace", "irq", NULL};
+	tep = tracefs_local_events_system(NULL, systems);
+	if (!tep) {
+		/* Failed to initialise tep handler with local events from
+		 * ftrace and irq systems in top instance.
+		 */
+		...
+	}
+...
+	tep_free(tep);
+...
+	int parsing_failures;
+	tep = tep_alloc();
+	if (!tep) {
+		/* Failed to allocate a tep handler */
+		...
+	}
+	if (tracefs_fill_local_events(NULL, tep, &parsing_failures) < 0) {
+		/* Failed to initialise tep handler with local events from top instance */
+	}
+...
+	tep_free(tep);
+--
+FILES
+-----
+[verse]
+--
+*tracefs.h*
+	Header file to include in order to have access to the library APIs.
+*-ltracefs*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtracefs(3)_,
+_libtraceevent(3)_,
+_trace-cmd(1)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtracefs is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/
\ No newline at end of file
-- 
2.28.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH v3 2/2] libtracefs man pages: helper APIs for working with trace file system.
  2020-12-22  4:53 [PATCH v3 0/2] libtracefs man pages Tzvetomir Stoyanov (VMware)
  2020-12-22  4:53 ` [PATCH v3 1/2] libtracefs man pages: APIs for initializing a tep handler with trace events from the local system Tzvetomir Stoyanov (VMware)
@ 2020-12-22  4:53 ` Tzvetomir Stoyanov (VMware)
  1 sibling, 0 replies; 3+ messages in thread
From: Tzvetomir Stoyanov (VMware) @ 2020-12-22  4:53 UTC (permalink / raw)
  To: rostedt; +Cc: linux-trace-devel

Documented APIs:
tracefs_tracers()
tracefs_get_clock()
tracefs_list_free()

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 Documentation/libtracefs-utils.txt | 103 +++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 Documentation/libtracefs-utils.txt

diff --git a/Documentation/libtracefs-utils.txt b/Documentation/libtracefs-utils.txt
new file mode 100644
index 0000000..03bc39b
--- /dev/null
+++ b/Documentation/libtracefs-utils.txt
@@ -0,0 +1,103 @@
+libtracefs(3)
+=============
+
+NAME
+----
+tracefs_tracers, tracefs_get_clock, tracefs_list_free -
+Helper functions for working with trace file system.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <tracefs.h>*
+
+char pass:[*]pass:[*]*tracefs_tracers*(const char pass:[*]_tracing_dir_);
+char pass:[*]*tracefs_get_clock*(struct tracefs_instance pass:[*]_instance_);
+void *tracefs_list_free*(char pass:[*]pass:[*]_list_);
+--
+
+DESCRIPTION
+-----------
+Various useful functions for working with trace file system.
+
+The _tracefs_tracers()_ function returns array of strings with the
+names of supported tracer plugins, located in the given _tracing_dir_
+directory. This could be NULL or the location of the tracefs mount point
+for the trace systems of the local machine, or it may be a path to a copy
+of the tracefs directory from another machine. The last entry in the array
+as a NULL pointer. The array must be freed with _tracefs_list_free()_ API.
+
+The _tracefs_get_clock()_ function returns name of the current trace clock,
+used in the given _instance_. If _instance_ is NULL, the clock of the main
+trace instance is returned. The returned string must be freed with free().
+
+The _tracefs_list_free()_ function frees an array of strings, returned by
+_tracefs_event_systems()_, _tracefs_system_events()_ and _tracefs_tracers()_
+APIs.
+
+RETURN VALUE
+------------
+The _tracefs_tracers()_ returns array of strings. The last element in that
+array is a NULL pointer. The array must be freed with _tracefs_list_free()_ API.
+In case of an error, NULL is returned.
+
+The _tracefs_get_clock()_ returns string, that must be freed with free(), or NULL
+in case of an error.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <tracefs.h>
+
+char **tracers = tracefs_tracers(NULL);
+
+	if (tracers) {
+		/* Got tracer plugins from the top trace instance */
+		...
+		tracefs_list_free(tracers);
+	}
+....
+char *clock = tracefs_get_clock(NULL);
+
+	if (clock) {
+		/* Got current trace clock of the top trace instance */
+		...
+		free(clock);
+	}
+--
+FILES
+-----
+[verse]
+--
+*tracefs.h*
+	Header file to include in order to have access to the library APIs.
+*-ltracefs*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtracefs(3)_,
+_libtraceevent(3)_,
+_trace-cmd(1)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtracefs is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/
\ No newline at end of file
-- 
2.28.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, back to index

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-22  4:53 [PATCH v3 0/2] libtracefs man pages Tzvetomir Stoyanov (VMware)
2020-12-22  4:53 ` [PATCH v3 1/2] libtracefs man pages: APIs for initializing a tep handler with trace events from the local system Tzvetomir Stoyanov (VMware)
2020-12-22  4:53 ` [PATCH v3 2/2] libtracefs man pages: helper APIs for working with trace file system Tzvetomir Stoyanov (VMware)

Linux-Trace-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-trace-devel/0 linux-trace-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-trace-devel linux-trace-devel/ https://lore.kernel.org/linux-trace-devel \
		linux-trace-devel@vger.kernel.org
	public-inbox-index linux-trace-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-trace-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git