linux-kernel - Re: [PATCH 4/4] perf tools: Support reading PERF_FORMAT

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Date:   Fri, 19 Aug 2022 12:53:18 +0200
From:   Jiri Olsa <olsajiri@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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
Subject: Re: [PATCH 4/4] perf tools: Support reading PERF_FORMAT_LOST

On Thu, Aug 18, 2022 at 05:36:44PM -0700, Namhyung Kim wrote:

SNIP

>  static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
> -			     u64 val, u64 ena, u64 run)
> +			     u64 val, u64 ena, u64 run, u64 lost)
>  {
>  	struct perf_counts_values *count;
>  
> @@ -1550,6 +1550,7 @@ static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
>  	count->val    = val;
>  	count->ena    = ena;
>  	count->run    = run;
> +	count->lost   = lost;
>  
>  	perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
>  }
> @@ -1558,7 +1559,7 @@ static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int
>  {
>  	u64 read_format = leader->core.attr.read_format;
>  	struct sample_read_value *v;
> -	u64 nr, ena = 0, run = 0, i;
> +	u64 nr, ena = 0, run = 0, lost = 0;
>  
>  	nr = *data++;
>  
> @@ -1571,18 +1572,18 @@ static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int
>  	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
>  		run = *data++;
>  
> -	v = (struct sample_read_value *) data;
> -
> -	evsel__set_count(leader, cpu_map_idx, thread, v[0].value, ena, run);
> -
> -	for (i = 1; i < nr; i++) {
> +	v = (void *)data;

nit, we could leave the 'v' assignment above right?

jirka

> +	sample_read_group__for_each(v, nr, read_format) {
>  		struct evsel *counter;
>  
> -		counter = evlist__id2evsel(leader->evlist, v[i].id);
> +		counter = evlist__id2evsel(leader->evlist, v->id);
>  		if (!counter)
>  			return -EINVAL;
>  
> -		evsel__set_count(counter, cpu_map_idx, thread, v[i].value, ena, run);
> +		if (read_format & PERF_FORMAT_LOST)
> +			lost = v->lost;
> +
> +		evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);

SNIP