linux-kernel - [tip:perf/core] perf stat record: Do not allow record with multiple runs mode

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Date:	Fri, 18 Dec 2015 01:11:09 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	namhyung@...nel.org, acme@...hat.com, dsahern@...il.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, kan.liang@...el.com,
	jolsa@...nel.org
Subject: [tip:perf/core] perf stat record:
  Do not allow record with multiple runs mode

Commit-ID:  e9d6db8e8df42a38f79f264ab58c104e1678b12c
Gitweb:     http://git.kernel.org/tip/e9d6db8e8df42a38f79f264ab58c104e1678b12c
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 5 Nov 2015 15:40:53 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 17 Dec 2015 16:00:32 -0300

perf stat record: Do not allow record with multiple runs mode

We currently don't support storing multiple session in perf.data,
so we can't allow -r option in stat record.

  $ perf stat -e cycles -r 2 record ls
  Cannot use -r option with perf stat record.

Committer note:

Before this patch we would a perf.data file such as:

  $ perf stat -e cycles -r 2 record ls
  <SNIP>

   Performance counter stats for 'ls' (2 runs):

         3,935,236      cycles

       0.002353261 seconds time elapsed                                          ( +-  4.76% )

  $ perf report -D | grep PERF_RECORD | grep ROUND
  0xf0 [0]: failed to process type: 16
  Error:
  failed to process sample
  $

Reported-by: Kan Liang <kan.liang@...el.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-10-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index fcece42..10f86a6 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1449,6 +1449,11 @@ static int __cmd_record(int argc, const char **argv)
 	if (output_name)
 		file->path = output_name;
 
+	if (run_count != 1 || forever) {
+		pr_err("Cannot use -r option with perf stat record.\n");
+		return -1;
+	}
+
 	session = perf_session__new(file, false, NULL);
 	if (session == NULL) {
 		pr_err("Perf session creation failed.\n");
--
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