linux-kernel - Re: [PATCH 10/12] perf script: Add --show-bpf-events to show eBPF related events

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Message-ID: <20190507081759.GB17416@krava>
Date:   Tue, 7 May 2019 10:18:00 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Stanislav Fomichev <sdf@...ichev.me>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 10/12] perf script: Add --show-bpf-events to show eBPF
 related events

On Mon, May 06, 2019 at 09:42:44PM +0000, Song Liu wrote:

SNIP

> > +static int
> > +process_bpf_events(struct perf_tool *tool __maybe_unused,
> > +		   union perf_event *event,
> > +		   struct perf_sample *sample,
> > +		   struct machine *machine)
> > +{
> > +	struct thread *thread;
> > +	struct perf_script *script = container_of(tool, struct perf_script, tool);
> > +	struct perf_session *session = script->session;
> > +	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
> > +
> > +	if (machine__process_ksymbol(machine, event, sample) < 0)
> > +		return -1;
> > +
> > +	if (!evsel->attr.sample_id_all) {
> > +		perf_event__fprintf(event, stdout);
> > +		return 0;
> > +	}
> > +
> > +	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
> > +	if (thread == NULL) {
> > +		pr_debug("problem processing MMAP event, skipping it.\n");
> > +		return -1;
> > +	}
> > +
> > +	if (!filter_cpu(sample)) {
> > +		perf_sample__fprintf_start(sample, thread, evsel,
> > +					   event->header.type, stdout);
> > +		perf_event__fprintf(event, stdout);
> > +	}
> > +
> > +	thread__put(thread);
> > +	return 0;
> > +}
> > +
> > static void sig_handler(int sig __maybe_unused)
> > {
> > 	session_done = 1;
> > @@ -2420,6 +2456,10 @@ static int __cmd_script(struct perf_script *script)
> > 		script->tool.ordered_events = false;
> > 		script->tool.finished_round = process_finished_round_event;
> > 	}
> > +	if (script->show_bpf_events) {
> > +		script->tool.ksymbol   = process_bpf_events;
> > +		script->tool.bpf_event = process_bpf_events;
> 
> Why do we need both set to process_bpf_events?

--show-*-events option is there to display all the related events for given '*'

we want to display both ksymbol and bpf_event in here,
process_bpf_events takes care of it for both of them

thanks,
jirka