linux-kernel - Re: [PATCH 3/3] perf-probe: Do not show the skipped events

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Date:   Thu, 23 Apr 2020 11:01:39 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH 3/3] perf-probe: Do not show the skipped events

Em Thu, Apr 23, 2020 at 08:01:22PM +0900, Masami Hiramatsu escreveu:
> When a probe point is expanded to several places (like inlined) and
> if some of them are skipped because of blacklisted or __init function,
> those trace_events has no event name. It must be skipped while showing
> results.
> 
> Without this fix, you can see "(null):(null)" on the list,
> ===========

Ok, you broke the patch in two, I think its better to combine both, ok?

- Arnaldo

>   # ./perf probe request_resource
>   reserve_setup is out of .text, skip it.
>   Added new events:
>     (null):(null)        (on request_resource)
>     probe:request_resource (on request_resource)
> 
>   You can now use it in all perf tools, such as:
> 
>   	perf record -e probe:request_resource -aR sleep 1
> 
> ===========
> 
> With this fix, it is ignored.
> ===========
>   # ./perf probe request_resource
>   reserve_setup is out of .text, skip it.
>   Added new events:
>     probe:request_resource (on request_resource)
> 
>   You can now use it in all perf tools, such as:
> 
>   	perf record -e probe:request_resource -aR sleep 1
> 
> ===========
> 
> Fixes: 5a51fcd1f30c ("perf probe: Skip kernel symbols which is out of .text")
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: stable@...r.kernel.org
> ---
>  tools/perf/builtin-probe.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
> index 70548df2abb9..6b1507566770 100644
> --- a/tools/perf/builtin-probe.c
> +++ b/tools/perf/builtin-probe.c
> @@ -364,6 +364,9 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
>  
>  		for (k = 0; k < pev->ntevs; k++) {
>  			struct probe_trace_event *tev = &pev->tevs[k];
> +			/* Skipped events have no event name */
> +			if (!tev->event)
> +				continue;
>  
>  			/* We use tev's name for showing new events */
>  			show_perf_probe_event(tev->group, tev->event, pev,
> 

-- 

- Arnaldo