linux-kernel - Re: [PATCH 7/7] perf tools: Set attr.task bit for a tracking event

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Date:	Mon, 22 Dec 2014 11:49:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 7/7] perf tools: Set attr.task bit for a tracking event

Em Mon, Dec 22, 2014 at 01:44:15PM +0900, Namhyung Kim escreveu:
> The perf_event_attr.task bit is to track task (fork and exit) events
> but it missed to be set by perf_evsel__config().  While it was not a
> problem in practice since setting other bits (comm/mmap) ended up
> being in same result, it'd be good to set it explicitly anyway.

I didn't understand, so this isn't strictly needed? I.e. what is the
point of the attr->task bit then?

/me goes to check...

- Arnaldo
 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/evsel.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 1e90c8557ede..e17d2b1624bc 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -709,6 +709,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
>  	if (opts->sample_weight)
>  		perf_evsel__set_sample_bit(evsel, WEIGHT);
>  
> +	attr->task  = track;
>  	attr->mmap  = track;
>  	attr->mmap2 = track && !perf_missing_features.mmap2;
>  	attr->comm  = track;
> -- 
> 2.1.3
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