netdev - Re: [PATCH 1/7] perf metricgroup: Change evlist

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Date:   Wed, 20 May 2020 15:14:22 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andriin@...com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        Paul Clarke <pc@...ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/7] perf metricgroup: Change evlist_used to a bitmap

On Wed, May 20, 2020 at 12:28:08AM -0700, Ian Rogers wrote:
> Use a bitmap rather than an array of bools.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  tools/perf/util/metricgroup.c | 18 ++++++++----------
>  1 file changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 6772d256dfdf..a16f60da06ab 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -95,7 +95,7 @@ struct egroup {
>  static struct evsel *find_evsel_group(struct evlist *perf_evlist,
>  				      struct expr_parse_ctx *pctx,
>  				      struct evsel **metric_events,
> -				      bool *evlist_used)
> +				      unsigned long *evlist_used)
>  {
>  	struct evsel *ev;
>  	bool leader_found;
> @@ -105,7 +105,7 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
>  	double *val_ptr;
>  
>  	evlist__for_each_entry (perf_evlist, ev) {
> -		if (evlist_used[j++])
> +		if (test_bit(j++, evlist_used))
>  			continue;
>  		if (hashmap__find(&pctx->ids, ev->name, (void **)&val_ptr)) {
>  			if (!metric_events[i])
> @@ -141,7 +141,7 @@ static struct evsel *find_evsel_group(struct evlist *perf_evlist,
>  			j++;
>  		}
>  		ev = metric_events[i];
> -		evlist_used[ev->idx] = true;
> +		set_bit(ev->idx, evlist_used);
>  	}
>  
>  	return metric_events[0];
> @@ -157,13 +157,11 @@ static int metricgroup__setup_events(struct list_head *groups,
>  	int ret = 0;
>  	struct egroup *eg;
>  	struct evsel *evsel;
> -	bool *evlist_used;
> +	unsigned long *evlist_used;
>  
> -	evlist_used = calloc(perf_evlist->core.nr_entries, sizeof(bool));
> -	if (!evlist_used) {
> -		ret = -ENOMEM;
> -		return ret;
> -	}
> +	evlist_used = bitmap_alloc(perf_evlist->core.nr_entries);
> +	if (!evlist_used)
> +		return -ENOMEM;
>  
>  	list_for_each_entry (eg, groups, nd) {
>  		struct evsel **metric_events;
> @@ -201,7 +199,7 @@ static int metricgroup__setup_events(struct list_head *groups,
>  		list_add(&expr->nd, &me->head);
>  	}
>  
> -	free(evlist_used);
> +	bitmap_free(evlist_used);
>  
>  	return ret;
>  }
> -- 
> 2.26.2.761.g0e0b3e54be-goog
>