linux-kernel - Re: [PATCH v2] perf probe: Fix to delete multiple probe event

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Date:   Mon, 9 Mar 2020 10:43:22 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     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>,
        He Zhe <zhe.he@...driver.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2] perf probe: Fix to delete multiple probe event

Em Fri, Feb 28, 2020 at 04:57:42PM +0900, Masami Hiramatsu escreveu:
> 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

Thanks, tested and applied to perf/urgent.

- Arnaldo
 
> Fixes: 72363540c009 ("perf probe: Support multiprobe event")
> Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> Reported-by: He Zhe <zhe.he@...driver.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  v2:
>   - Forward port on the latest perf/urgent tree.
>   - Add Fixes and Reporters.
> ---
>  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 0f5fda11675f..8c852948513e 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;
>  	}
> 

-- 

- Arnaldo