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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

40
tools/lib/traceevent/event-parse-api.c
View File

@@ -302,33 +302,6 @@ void tep_set_local_bigendian(struct tep_handle *tep, enum tep_endian endian)
tep->host_bigendian = endian;
}
/**
* tep_is_latency_format - get if the latency output format is configured
* @tep: a handle to the tep_handle
*
* This returns true if the latency output format is configured
* If @tep is NULL, false is returned.
*/
bool tep_is_latency_format(struct tep_handle *tep)
{
if (tep)
return (tep->latency_format);
return false;
}
/**
* tep_set_latency_format - set the latency output format
* @tep: a handle to the tep_handle
* @lat: non zero for latency output format
*
* This sets the latency output format
*/
void tep_set_latency_format(struct tep_handle *tep, int lat)
{
if (tep)
tep->latency_format = lat;
}
/**
* tep_is_old_format - get if an old kernel is used
* @tep: a handle to the tep_handle
@@ -344,19 +317,6 @@ bool tep_is_old_format(struct tep_handle *tep)
return false;
}
/**
* tep_set_print_raw - set a flag to force print in raw format
* @tep: a handle to the tep_handle
* @print_raw: the new value of the print_raw flag
*
* This sets a flag to force print in raw format
*/
void tep_set_print_raw(struct tep_handle *tep, int print_raw)
{
if (tep)
tep->print_raw = print_raw;
}
/**
* tep_set_test_filters - set a flag to test a filter string
* @tep: a handle to the tep_handle