linux-kernel - Re: [PATCH V2 07/14] perf tools: Add evsel->own

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Message-ID: <20150908064508.GA20530@krava.brq.redhat.com>
Date:	Tue, 8 Sep 2015 08:45:08 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>, mingo@...nel.org,
	kan.liang@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 07/14] perf tools: Add evsel->own_cpus

On Mon, Sep 07, 2015 at 05:27:49PM +0300, Adrian Hunter wrote:
> perf_evlist__propagate_maps() cannot easily tell if an evsel
> has its own cpu map.  To make that simpler, keep a copy of
> the PMU cpu map and adjust the propagation logic accordingly.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/evlist.c       | 5 ++++-
>  tools/perf/util/evsel.c        | 1 +
>  tools/perf/util/evsel.h        | 1 +
>  tools/perf/util/parse-events.c | 4 ++--
>  4 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index c959c42080e3..6764e0eff849 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1111,9 +1111,12 @@ static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
>  		 * We already have cpus for evsel (via PMU sysfs) so
>  		 * keep it, if there's no target cpu list defined.
>  		 */
> -		if (!evsel->cpus || evlist->has_user_cpus) {
> +		if (!evsel->own_cpus || evlist->has_user_cpus) {
>  			cpu_map__put(evsel->cpus);
>  			evsel->cpus = cpu_map__get(evlist->cpus);
> +		} else if (evsel->cpus != evsel->own_cpus) {
> +			cpu_map__put(evsel->cpus);
> +			evsel->cpus = cpu_map__get(evsel->own_cpus);

hum, so (evsel->cpus != evsel->own_cpus) could happen only when:
  - evsel->own_cpus != NULL
  - we overloaded evsel->cpus with evlist->cpus via perf_evlist__propagate_maps
  - we changed evlist->has_user_cpus = false
  - we recall perf_evlist__propagate_maps

I'm missing usecase for that, or something else ;-)

thanks,
jirka
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