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SubjectRe: [PATCH] perf-probe: Accept the instance number of kretprobe event
Em Wed, May 06, 2020 at 11:29:12PM +0900, Masami Hiramatsu escreveu:
> Since the commit 6a13a0d7b4d1 ("ftrace/kprobe: Show the
> maxactive number on kprobe_events") introduced to show the
> instance number of kretprobe events, the length of the 1st
> format of the kprobe event will not 1, but it can be longer.
> This caused a parser error in perf-probe.

Thanks for the quick fix!

I'll add this right after the Fixes tag:

Reported-by: yshuiv7@gmail.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207587

Ok?

yshuiv, can I have your name to add to that Reported-by tag? And if you
test it, please, I can add a Tested-by: tag as well, credits where
credits are due!

Thanks!

- Arnaldo

> Skip the length check the 1st format of the kprobe event
> to accept this instance number.
>
> Without this fix:
>
> # perf probe -a vfs_read%return
> Added new event:
> probe:vfs_read__return (on vfs_read%return)
>
> You can now use it in all perf tools, such as:
>
> perf record -e probe:vfs_read__return -aR sleep 1
>
> # perf probe -l
> Semantic error :Failed to parse event name: r16:probe/vfs_read__return
> Error: Failed to show event list.
>
> And with this fixes:
>
> # perf probe -a vfs_read%return
> ...
> # perf probe -l
> probe:vfs_read__return (on vfs_read%return)
>
>
> Fixes: 6a13a0d7b4d1 ("ftrace/kprobe: Show the maxactive number on kprobe_events")
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: stable@vger.kernel.org
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=207587
> ---
> tools/perf/util/probe-event.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index eea132f512b0..c6bcf5709564 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -1765,8 +1765,7 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
> fmt1_str = strtok_r(argv0_str, ":", &fmt);
> fmt2_str = strtok_r(NULL, "/", &fmt);
> fmt3_str = strtok_r(NULL, " \t", &fmt);
> - if (fmt1_str == NULL || strlen(fmt1_str) != 1 || fmt2_str == NULL
> - || fmt3_str == NULL) {
> + if (fmt1_str == NULL || fmt2_str == NULL || fmt3_str == NULL) {
> semantic_error("Failed to parse event name: %s\n", argv[0]);
> ret = -EINVAL;
> goto out;
>

--

- Arnaldo

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