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Message-ID: <tip-6dfe6849b6ee69975eb82181e0afb03fbd8b578f@git.kernel.org>
Date: Sat, 18 May 2019 02:13:11 -0700
From: tip-bot for Tzvetomir Stoyanov <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: akpm@...ux-foundation.org, tglx@...utronix.de, namhyung@...nel.org,
rostedt@...dmis.org, jolsa@...hat.com, tstoyanov@...are.com,
linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
mingo@...nel.org
Subject: [tip:perf/core] tools lib traceevent: Man pages for print field
APIs
Commit-ID: 6dfe6849b6ee69975eb82181e0afb03fbd8b578f
Gitweb: https://git.kernel.org/tip/6dfe6849b6ee69975eb82181e0afb03fbd8b578f
Author: Tzvetomir Stoyanov <tstoyanov@...are.com>
AuthorDate: Fri, 10 May 2019 15:56:26 -0400
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 15 May 2019 16:36:48 -0300
tools lib traceevent: Man pages for print field APIs
Create man pages for libtraceevent APIs:
tep_print_field(),
tep_print_fields(),
tep_print_num_field(),
tep_print_func_field()
Signed-off-by: Tzvetomir Stoyanov <tstoyanov@...are.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-trace-devel@...r.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190503091119.23399-20-tstoyanov@vmware.com
Link: http://lkml.kernel.org/r/20190510200109.054708419@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
.../Documentation/libtraceevent-field_print.txt | 126 +++++++++++++++++++++
1 file changed, 126 insertions(+)
diff --git a/tools/lib/traceevent/Documentation/libtraceevent-field_print.txt b/tools/lib/traceevent/Documentation/libtraceevent-field_print.txt
new file mode 100644
index 000000000000..9a9df98ac44d
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-field_print.txt
@@ -0,0 +1,126 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_print_field, tep_print_fields, tep_print_num_field, tep_print_func_field -
+Print the field content.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+*#include <trace-seq.h>*
+
+void *tep_print_field*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, struct tep_format_field pass:[*]_field_);
+void *tep_print_fields*(struct trace_seq pass:[*]_s_, void pass:[*]_data_, int _size_, struct tep_event pass:[*]_event_);
+int *tep_print_num_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+int *tep_print_func_field*(struct trace_seq pass:[*]_s_, const char pass:[*]_fmt_, struct tep_event pass:[*]_event_, const char pass:[*]_name_, struct tep_record pass:[*]_record_, int _err_);
+--
+
+DESCRIPTION
+-----------
+These functions print recorded field's data, according to the field's type.
+
+The _tep_print_field()_ function extracts from the recorded raw _data_ value of
+the _field_ and prints it into _s_, according to the field type.
+
+The _tep_print_fields()_ prints each field name followed by the record's field
+value according to the field's type:
+[verse]
+--
+"field1_name=field1_value field2_name=field2_value ..."
+--
+It iterates all fields of the _event_, and calls _tep_print_field()_ for each of
+them.
+
+The _tep_print_num_field()_ function prints a numeric field with given format
+string. A search is performed in the _event_ for a field with _name_. If such
+field is found, its value is extracted from the _record_ and is printed in the
+_s_, according to the given format string _fmt_. If the argument _err_ is
+non-zero, and an error occures - it is printed in the _s_.
+
+The _tep_print_func_field()_ function prints a function field with given format
+string. A search is performed in the _event_ for a field with _name_. If such
+field is found, its value is extracted from the _record_. The value is assumed
+to be a function address, and a search is perform to find the name of this
+function. The function name (if found) and its address are printed in the _s_,
+according to the given format string _fmt_. If the argument _err_ is non-zero,
+and an error occures - it is printed in _s_.
+
+RETURN VALUE
+------------
+The _tep_print_num_field()_ and _tep_print_func_field()_ functions return 1
+on success, -1 in case of an error or 0 if the print buffer _s_ is full.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+struct trace_seq seq;
+trace_seq_init(&seq);
+struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
+...
+void process_record(struct tep_record *record)
+{
+ struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid");
+
+ trace_seq_reset(&seq);
+
+ /* Print the value of "common_pid" */
+ tep_print_field(&seq, record->data, field_pid);
+
+ /* Print all fields of the "hrtimer_start" event */
+ tep_print_fields(&seq, record->data, record->size, event);
+
+ /* Print the value of "expires" field with custom format string */
+ tep_print_num_field(&seq, " timer expires in %llu ", event, "expires", record, 0);
+
+ /* Print the address and the name of "function" field with custom format string */
+ tep_print_func_field(&seq, " timer function is %s ", event, "function", record, 0);
+ }
+ ...
+--
+
+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@...dmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@...il.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to <linux-trace-devel@...r.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
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