linux-kernel - [PATCH 3/7] perf list: fix some inaccuracy problem when parsing the argument

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Message-ID: <1423833115-11199-4-git-send-email-yunlong.song@huawei.com>
Date:	Fri, 13 Feb 2015 21:11:51 +0800
From:	Yunlong Song <yunlong.song@...wei.com>
To:	<a.p.zijlstra@...llo.nl>, <paulus@...ba.org>, <mingo@...hat.com>,
	<acme@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <wangnan0@...wei.com>
Subject: [PATCH 3/7] perf list: fix some inaccuracy problem when parsing the argument

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>
---
 tools/perf/builtin-list.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index de5680e..003dec5 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -47,7 +47,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 	}

 	for (i = 0; i < argc; ++i) {
-		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)
-- 
1.8.5.5

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