linux-kernel - [tip:perf/core] perf list: Allow listing events with 'tracepoint' prefix

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Message-ID: <tip-161149513b3570ebd7fe14fc2ddc42cb46557e37@git.kernel.org>
Date:	Sat, 28 Feb 2015 01:33:11 -0800
From:	tip-bot for Yunlong Song <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, acme@...hat.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org, paulus@...ba.org,
	wangnan0@...wei.com, yunlong.song@...wei.com, tglx@...utronix.de,
	a.p.zijlstra@...llo.nl, mingo@...nel.org
Subject: [tip:perf/core] perf list: Allow listing events with 'tracepoint'
  prefix

Commit-ID:  161149513b3570ebd7fe14fc2ddc42cb46557e37
Gitweb:     http://git.kernel.org/tip/161149513b3570ebd7fe14fc2ddc42cb46557e37
Author:     Yunlong Song <yunlong.song@...wei.com>
AuthorDate: Fri, 27 Feb 2015 18:21:26 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 27 Feb 2015 15:51:51 -0300

perf list: Allow listing events with 'tracepoint' prefix

If somebody happens to name an event with the beginning of 'tracepoint'
(e.g. tracepoint_foo), then it will never be showed with perf list
event_glob, thus we parse the argument 'tracepoint' more carefully for
accuracy.

Example:

Before this patch:

 $ perf list tracepoint_foo:*

   jbd2:jbd2_start_commit                             [Tracepoint event]
   jbd2:jbd2_commit_locking                           [Tracepoint event]
   jbd2:jbd2_run_stats                                [Tracepoint event]
   block:block_rq_issue                               [Tracepoint event]
   block:block_bio_complete                           [Tracepoint event]
   block:block_bio_backmerge                          [Tracepoint event]
   block:block_getrq                                  [Tracepoint event]
   ...                                                ...

As shown above, all of the tracepoint events are printed. In fact, the
command's real intention is to print the events of tracepoint_foo.

After this patch:

 $ perf list tracepoint_foo:*

   tracepoint_foo:tp_foo_enter                        [Tracepoint event]
   tracepoint_foo:tp_foo_exit                         [Tracepoint event]

As shown above, only the events of tracepoint_foo are printed.

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1425032491-20224-3-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-list.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index ad8018e..2acbcf0 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -50,9 +50,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 	}

 	for (i = 0; i < argc; ++i) {
-		if (i)
-			putchar('\n');
-		if (strncmp(argv[i], "tracepoint", 10) == 0)
+		if (strcmp(argv[i], "tracepoint") == 0)
 			print_tracepoint_events(NULL, NULL, false);
 		else if (strcmp(argv[i], "hw") == 0 ||
 			 strcmp(argv[i], "hardware") == 0)
--
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