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libtraceevent, perf tools: Changes in tep_print_event_* APIs

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Libtraceevent APIs for printing various trace events information are
complicated, there are complex extra parameters. To control the way
event information is printed, the user should call a set of functions in
a specific sequence.

These APIs are reimplemented to provide a more simple interface for
printing event information.

Removed APIs:

 	tep_print_event_task()
	tep_print_event_time()
	tep_print_event_data()
	tep_event_info()
	tep_is_latency_format()
	tep_set_latency_format()
	tep_data_latency_format()
	tep_set_print_raw()

A new API for printing event information is introduced:
   void tep_print_event(struct tep_handle *tep, struct trace_seq *s,
		        struct tep_record *record, const char *fmt, ...);
where "fmt" is a printf-like format string, followed by the event
fields to be printed. Supported fields:
 TEP_PRINT_PID, "%d" - event PID
 TEP_PRINT_CPU, "%d" - event CPU
 TEP_PRINT_COMM, "%s" - event command string
 TEP_PRINT_NAME, "%s" - event name
 TEP_PRINT_LATENCY, "%s" - event latency
 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:
  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);
Output:
	ls-11314 [005] d.h. 185207.366383 function __wake_up

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
Cc: Patrick McLean <chutzpah@gentoo.org>
Link: http://lore.kernel.org/linux-trace-devel/20190801074959.22023-2-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/lkml/20190805204355.041132030@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tzvetomir Stoyanov
2019-08-05 16:43:13 -04:00
committed by Arnaldo Carvalho de Melo
parent 4cb3c6d546
commit 38847db974
7 changed files with 215 additions and 212 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
tools/perf/builtin-kmem.c
View File

@@ -750,7 +750,8 @@ static int parse_gfp_flags(struct evsel *evsel, struct perf_sample *sample,
}
trace_seq_init(&seq);
tep_event_info(&seq, evsel->tp_format, &record);
tep_print_event(evsel->tp_format->tep,
&seq, &record, "%s", TEP_PRINT_INFO);
str = strtok_r(seq.buffer, " ", &pos);
while (str) {

3
tools/perf/util/sort.c
View File

@@ -709,7 +709,8 @@ static char *get_trace_output(struct hist_entry *he)
tep_print_fields(&seq, he->raw_data, he->raw_size,
evsel->tp_format);
} else {
tep_event_info(&seq, evsel->tp_format, &rec);
tep_print_event(evsel->tp_format->tep,
&seq, &rec, "%s", TEP_PRINT_INFO);
}
/*
* Trim the buffer, it starts at 4KB and we're not going to

2
tools/perf/util/trace-event-parse.c
View File

@@ -109,7 +109,7 @@ void event_format__fprintf(struct tep_event *event,
record.data = data;
trace_seq_init(&s);
tep_event_info(&s, event, &record);
tep_print_event(event->tep, &s, &record, "%s", TEP_PRINT_INFO);
trace_seq_do_fprintf(&s, fp);
trace_seq_destroy(&s);
}