Re: [PATCH] perf probe: Fix to delete multiple probe event

Masami Hiramatsu
2020-01-08T02:36:56Z

Hi Arnaldo,

Could you pick this fix?

Sandipan, could you also test this?

Thank you,

On Wed, 4 Dec 2019 11:29:52 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> On Tue, 3 Dec 2019 17:01:54 +0900
> Masami Hiramatsu <mhiramat@kernel.org> wrote:
>
> > Fix to delete multiple probe event with filter correctly.
> >
> > When we put an event with multiple probes, perf-probe fails
> > to delete with filters. This comes from a failure to list
> > up the event name because of overwrapping its name.
> >
> > To fix this issue, skip to list up the event which has
> > same name.
> >
> > Without this patch:
> > # perf probe -l \*
> > probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:21@
> > probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:25@
> > probe_perf:map__map_ip (on append_inlines:12@util/machine.c in
> > probe_perf:map__map_ip (on unwind_entry:19@util/machine.c in /
> > probe_perf:map__map_ip (on map__map_ip@util/map.h in /home/mhi
> > probe_perf:map__map_ip (on map__map_ip@util/map.h in /home/mhi
> > # perf probe -d \*
> > "*" does not hit any event.
> > Error: Failed to delete events. Reason: No such file or directory (Code: -2)
> >
> > With this:
> > # perf probe -d \*
> > Removed event: probe_perf:map__map_ip
> >
>
> Oops, I missed Fixed tag.
>
> Fixes: 72363540c009 ("perf probe: Support multiprobe event")
>
> Thanks,
>
> > Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
> > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> > ---
> > tools/perf/util/probe-file.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> > index 5003ba403345..c03a591d41a4 100644
> > --- a/tools/perf/util/probe-file.c
> > +++ b/tools/perf/util/probe-file.c
> > @@ -206,6 +206,9 @@ static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
> > } else
> > ret = strlist__add(sl, tev.event);
> > clear_probe_trace_event(&tev);
> > + /* Skip if there is same name multi-probe event in the list */
> > + if (ret == -EEXIST)
> > + ret = 0;
> > if (ret < 0)
> > break;
> > }
> >
>
>
> --
> Masami Hiramatsu <mhiramat@kernel.org>

--
Masami Hiramatsu <mhiramat@kernel.org>