Re: [PATCH 1/3] perf probe: Set retprobe flag when probe in address-based alternative mode

Masami Hiramatsu
2015-04-13T15:43:04Z

(2015/04/13 20:41), He Kuang wrote:
> Perf probe misses to set retprobe flag back when falling back to
> address-based alternative mode.
>
> Can be reproduced as following:
>
> $ perf probe -v -k vmlinux --add='sys_write%return'
> ...
> Added new event:
> Writing event: p:probe/sys_write _stext+1584952
> probe:sys_write (on sys_write%return)
>
> $ cat /sys/kernel/debug/tracing/kprobe_events
> p:probe/sys_write _stext+1584952
>
> After this patch:
>
> $ perf probe -v -k vmlinux --add='sys_write%return'
> Added new event:
> Writing event: r:probe/sys_write SyS_write+0
> probe:sys_write (on sys_write%return)
>
> $ cat /sys/kernel/debug/tracing/kprobe_events
> r:probe/sys_write SyS_write
>
> Signed-off-by: He Kuang <hekuang@huawei.com>

Oops, I missed that!

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

Thank you!

> ---
> tools/perf/util/probe-event.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 30545ce..5483d98 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -332,6 +332,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo,
> else {
> result->offset += pp->offset;
> result->line += pp->line;
> + result->retprobe = pp->retprobe;
> ret = 0;
> }
>
>

--
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@hitachi.com