linux-kernel - Re: [PATCH 14/14] perf script: show overhead events

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Date:   Thu, 24 Nov 2016 00:18:32 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     kan.liang@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        tglx@...utronix.de, namhyung@...nel.org, jolsa@...nel.org,
        adrian.hunter@...el.com, wangnan0@...wei.com, mark.rutland@....com,
        andi@...stfloor.org
Subject: Re: [PATCH 14/14] perf script: show overhead events

On Wed, Nov 23, 2016 at 04:44:52AM -0500, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> Introduce a new option --show-overhead to show overhead events in perf
> script
> 
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
>  tools/perf/builtin-script.c | 36 ++++++++++++++++++++++++++++++++++++
>  tools/perf/util/event.c     | 37 +++++++++++++++++++++++++++++++++++++
>  tools/perf/util/event.h     |  1 +
>  3 files changed, 74 insertions(+)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index e1daff3..76d9747 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -829,6 +829,7 @@ struct perf_script {
>  	bool			show_task_events;
>  	bool			show_mmap_events;
>  	bool			show_switch_events;
> +	bool			show_overhead;
>  	bool			allocated;
>  	struct cpu_map		*cpus;
>  	struct thread_map	*threads;
> @@ -1264,6 +1265,37 @@ static int process_switch_event(struct perf_tool *tool,
>  	return 0;
>  }
>  
> +static int process_overhead_event(struct perf_tool *tool,
> +				  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;
> +
> +	if (perf_event__process_switch(tool, event, sample, machine) < 0)
> +		return -1;

process_switch event? copy&paste error?

jirka

> +	if (sample) {
> +		evsel = perf_evlist__id2evsel(session->evlist, sample->id);
> +		thread = machine__findnew_thread(machine, sample->pid, sample->tid);
> +		if (thread == NULL) {
> +			pr_debug("problem processing OVERHEAD event, skipping it.\n");
> +			return -1;
> +		}
> +
> +		print_sample_start(sample, thread, evsel);
> +		perf_event__fprintf(event, stdout);
> +		thread__put(thread);
> +	} else {
> +		/* USER OVERHEAD event */
> +		perf_event__fprintf(event, stdout);
> +	}
> +
> +	return 0;
> +}
> +

SNIP