linux-kernel - Re: [PATCH 1/5] libperf: Populate system-wide evsel maps

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Date:   Tue, 27 Sep 2022 09:56:06 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH 1/5] libperf: Populate system-wide evsel maps

On 24/09/22 19:57, Namhyung Kim wrote:
> Setting proper cpu and thread maps for system wide evsels regardless of
> user requested cpu in __perf_evlist__propagate_maps().  Those evsels
> need to be active on all cpus always.  Do it in the libperf so that we
> can guarantee it has proper maps.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/lib/perf/evlist.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
> index 6b1bafe267a4..187129652ab6 100644
> --- a/tools/lib/perf/evlist.c
> +++ b/tools/lib/perf/evlist.c
> @@ -40,11 +40,11 @@ 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->own_cpus ||
> -	    (!evsel->system_wide && evlist->has_user_cpus) ||
> -	    (!evsel->system_wide &&
> -	     !evsel->requires_cpu &&
> -	     perf_cpu_map__empty(evlist->user_requested_cpus))) {
> +	if (evsel->system_wide) {
> +		perf_cpu_map__put(evsel->cpus);
> +		evsel->cpus = perf_cpu_map__new(NULL);
> +	} else if (!evsel->own_cpus || evlist->has_user_cpus ||
> +		   (!evsel->requires_cpu && perf_cpu_map__empty(evlist->user_requested_cpus))) {
>  		perf_cpu_map__put(evsel->cpus);
>  		evsel->cpus = perf_cpu_map__get(evlist->user_requested_cpus);
>  	} else if (evsel->cpus != evsel->own_cpus) {
> @@ -52,7 +52,10 @@ static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
>  		evsel->cpus = perf_cpu_map__get(evsel->own_cpus);
>  	}
>  
> -	if (!evsel->system_wide) {
> +	if (evsel->system_wide) {
> +		perf_thread_map__put(evsel->threads);
> +		evsel->threads = perf_thread_map__new_dummy();
> +	} else {
>  		perf_thread_map__put(evsel->threads);
>  		evsel->threads = perf_thread_map__get(evlist->threads);
>  	}