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

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Date:   Wed, 8 Jan 2020 11:36:50 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Sandipan Das <sandipan@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf probe: Fix to delete multiple probe event

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@...nel.org> wrote:

> On Tue,  3 Dec 2019 17:01:54 +0900
> Masami Hiramatsu <mhiramat@...nel.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@...l/machine.c in
> >     probe_perf:map__map_ip (on unwind_entry:19@...l/machine.c in /
> >     probe_perf:map__map_ip (on map__map_ip@...l/map.h in /home/mhi
> >     probe_perf:map__map_ip (on map__map_ip@...l/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@...nel.org>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.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@...nel.org>


-- 
Masami Hiramatsu <mhiramat@...nel.org>