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

Yunlong Song
2015-02-13T13:11:43Z

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@huawei.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