Commit 664c98d4 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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perf stat record: Add pipe support for record command 



Allowing storing stat record data into pipe, so report tools
(report/script) could read data directly from record.

Committer note:

Before this patch:

  $ perf stat record -o - usleep 1 | perf report -i -
  incompatible file format (rerun with -v to learn more)
  $ perf stat record -o - usleep 1 | perf script -i -
  incompatible file format (rerun with -v to learn more)
  $ ls -la perf.data
  ls: cannot access perf.data: No such file or directory
  $

After:

  $ perf stat record -o - usleep 1 | perf report -i -
  # To display the perf.data header info, please use
  # --header/--header-only options.
  #
  Error:
  The - file has no samples!
  $ perf stat record -o - usleep 1 | perf script -i -
  Display of symbols requested but neither sample IP nor sample address
  is selected. Hence, no addresses to convert to symbols.
  0 [0x80]: failed to process type: 64
  $ ls -la perf.data
  ls: cannot access perf.data: No such file or directory
  $

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: default avatarKan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-7-git-send-email-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 2af4646d

tools/perf/builtin-stat.c

+28 −11
Original line number Diff line number Diff line
@@ -317,10 +317,19 @@ static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *inf 
	workload_exec_errno = info->si_value.sival_int;

}



static int perf_stat_synthesize_config(void)

static int perf_stat_synthesize_config(bool is_pipe)

{

	int err;



	if (is_pipe) {

		err = perf_event__synthesize_attrs(NULL, perf_stat.session,

						   process_synthesized_event);

		if (err < 0) {

			pr_err("Couldn't synthesize attrs.\n");

			return err;

		}

	}



	err = perf_event__synthesize_thread_map2(NULL, evsel_list->threads,

						process_synthesized_event,

						NULL);
@@ -388,6 +397,7 @@ static int __run_perf_stat(int argc, const char **argv) 
	size_t l;

	int status = 0;

	const bool forks = (argc > 0);

	bool is_pipe = STAT_RECORD ? perf_stat.file.is_pipe : false;



	if (interval) {

		ts.tv_sec  = interval / 1000;
@@ -398,7 +408,7 @@ static int __run_perf_stat(int argc, const char **argv) 
	}



	if (forks) {

		if (perf_evlist__prepare_workload(evsel_list, &target, argv, false,

		if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,

						  workload_exec_failed_signal) < 0) {

			perror("failed to prepare workload");

			return -1;
@@ -457,12 +467,17 @@ static int __run_perf_stat(int argc, const char **argv) 
	if (STAT_RECORD) {

		int err, fd = perf_data_file__fd(&perf_stat.file);



		if (is_pipe) {

			err = perf_header__write_pipe(perf_data_file__fd(&perf_stat.file));

		} else {

			err = perf_session__write_header(perf_stat.session, evsel_list,

							 fd, false);

		}



		if (err < 0)

			return err;



		err = perf_stat_synthesize_config();

		err = perf_stat_synthesize_config(is_pipe);

		if (err < 0)

			return err;

	}
@@ -970,6 +985,10 @@ static void print_counters(struct timespec *ts, int argc, const char **argv) 
	struct perf_evsel *counter;

	char buf[64], *prefix = NULL;



	/* Do not print anything if we record to the pipe. */

	if (STAT_RECORD && perf_stat.file.is_pipe)

		return;



	if (interval)

		print_interval(prefix = buf, ts);

	else
@@ -1402,10 +1421,6 @@ static int __cmd_record(int argc, const char **argv) 
		return -1;

	}



	/* No pipe support ATM */

	if (perf_stat.file.is_pipe)

		return -EINVAL;



	init_features(session);



	session->evlist   = evsel_list;
@@ -1636,8 +1651,10 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused) 
				   "older tools may produce warnings about this file\n.");

		}



		if (!perf_stat.file.is_pipe) {

			perf_stat.session->header.data_size += perf_stat.bytes_written;

			perf_session__write_header(perf_stat.session, evsel_list, fd, true);

		}



		perf_session__delete(perf_stat.session);

	}

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