linux-kernel - Re: [PATCH 17/22] perf cpumap: Refactor cpu_map__build

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Date:   Sat, 11 Dec 2021 20:25:10 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        "Paul A . Clarke" <pc@...ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vineet Singh <vineet.singh@...el.com>,
        James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, eranian@...gle.com
Subject: Re: [PATCH 17/22] perf cpumap: Refactor cpu_map__build_map

On Tue, Dec 07, 2021 at 06:46:02PM -0800, Ian Rogers wrote:

SNIP

> -			perror("cannot build core map");
> -			return -1;
> -		}
> -		stat_config.aggr_get_id = perf_stat__get_core_file;
> -		break;
> +		return perf_stat__get_core_file;
>  	case AGGR_NODE:
> -		if (perf_env__build_node_map(env, evsel_list->core.cpus, &stat_config.aggr_map)) {
> -			perror("cannot build core map");
> -			return -1;
> -		}
> -		stat_config.aggr_get_id = perf_stat__get_node_file;
> -		break;
> +		return perf_stat__get_node_file;
>  	case AGGR_NONE:
>  	case AGGR_GLOBAL:
>  	case AGGR_THREAD:
>  	case AGGR_UNSET:
>  	default:
> -		break;
> +		return NULL;
>  	}
> +}
> +
> +static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
> +{
> +	struct perf_env *env = &st->session->header.env;
>  
> +	aggr_cpu_id_get_t f = aggr_mode__get_aggr_file(stat_config.aggr_mode);

we use get_id for aggr_get_id_t, maybe we could use it instead of 'f' in
here as well

> +
> +	if (!f)
> +		return 0;
> +
> +	stat_config.aggr_map = cpu_aggr_map__new(evsel_list->core.cpus, f, env);
> +	if (!stat_config.aggr_map) {
> +		pr_err("cannot build %s map", aggr_mode__string[stat_config.aggr_mode]);
> +		return -1;
> +	}
> +	stat_config.aggr_get_id = aggr_mode__get_id_file(stat_config.aggr_mode);
>  	return 0;
>  }
>  
> diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
> index 32f9fc2dd389..ba4468f691c8 100644
> --- a/tools/perf/util/cpumap.c
> +++ b/tools/perf/util/cpumap.c
> @@ -140,7 +140,7 @@ struct aggr_cpu_id cpu_map__get_socket_aggr_by_cpu(int cpu, void *data __maybe_u
>  	return id;
>  }
>  
> -static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
> +static int aggr_cpu_id__cmp(const void *a_pointer, const void *b_pointer)
>  {
>  	struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
>  	struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
> @@ -157,37 +157,40 @@ static int cmp_aggr_cpu_id(const void *a_pointer, const void *b_pointer)
>  		return a->thread - b->thread;
>  }
>  
> -int cpu_map__build_map(struct perf_cpu_map *cpus, struct cpu_aggr_map **res,
> -		       struct aggr_cpu_id (*f)(int cpu, void *data),
> -		       void *data)
> +struct cpu_aggr_map *cpu_aggr_map__new(const struct perf_cpu_map *cpus,
> +				       aggr_cpu_id_get_t f,
> +				       void *data)

same here

thanks,
jirka

>  {
> -	int nr = cpus->nr;
> -	struct cpu_aggr_map *c = cpu_aggr_map__empty_new(nr);
> -	int cpu, s2;
> -	struct aggr_cpu_id s1;
> +	int cpu, idx;
> +	struct cpu_aggr_map *c = cpu_aggr_map__empty_new(cpus->nr);
>  
>  	if (!c)
> -		return -1;
> +		return NULL;
>  
>  	/* Reset size as it may only be partially filled */
>  	c->nr = 0;
>  
> -	for (cpu = 0; cpu < nr; cpu++) {
> -		s1 = f(cpu, data);
> -		for (s2 = 0; s2 < c->nr; s2++) {
> -			if (aggr_cpu_id__equal(&s1, &c->map[s2]))
> +	perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
> +		bool duplicate = false;
> +		struct aggr_cpu_id cpu_id = f(cpu, data);
> +
> +		for (int j = 0; j < c->nr; j++) {
> +			if (aggr_cpu_id__equal(&cpu_id, &c->map[j])) {
> +				duplicate = true;
>  				break;
> +			}
>  		}
> -		if (s2 == c->nr) {
> -			c->map[c->nr] = s1;
> +		if (!duplicate) {
> +			c->map[c->nr] = cpu_id;
>  			c->nr++;
>  		}
>  	}
> +
>  	/* ensure we process id in increasing order */
> -	qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), cmp_aggr_cpu_id);
> +	qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), aggr_cpu_id__cmp);
> +
> +	return c;
>  
> -	*res = c;
> -	return 0;
>  }
>  

SNIP