linux-kernel - Re: [PATCH v4 3/4] perf-stat: introduce config stat.bpf-counter-events

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Message-ID: <YH8P5ol5JRr5JO5v@krava>
Date:   Tue, 20 Apr 2021 19:31:18 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <song@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, acme@...nel.org,
        acme@...hat.com, namhyung@...nel.org, jolsa@...nel.org,
        songliubraving@...com
Subject: Re: [PATCH v4 3/4] perf-stat: introduce config
 stat.bpf-counter-events

On Mon, Apr 19, 2021 at 01:36:48PM -0700, Song Liu wrote:

SNIP

>  	if (stat_config.initial_delay < 0) {
> @@ -784,11 +790,11 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
>  	if (affinity__setup(&affinity) < 0)
>  		return -1;
>  
> -	if (target__has_bpf(&target)) {
> -		evlist__for_each_entry(evsel_list, counter) {
> -			if (bpf_counter__load(counter, &target))
> -				return -1;
> -		}
> +	evlist__for_each_entry(evsel_list, counter) {
> +		if (bpf_counter__load(counter, &target))
> +			return -1;
> +		if (!evsel__is_bpf(counter))
> +			all_counters_use_bpf = false;

could be done in bpf_counter__load, check below:

>  	}
>  
>  	evlist__for_each_cpu (evsel_list, i, cpu) {
> diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
> index 5de991ab46af9..33b1888103dfa 100644
> --- a/tools/perf/util/bpf_counter.c
> +++ b/tools/perf/util/bpf_counter.c
> @@ -790,7 +790,8 @@ int bpf_counter__load(struct evsel *evsel, struct target *target)
>  {
>  	if (target->bpf_str)
>  		evsel->bpf_counter_ops = &bpf_program_profiler_ops;
> -	else if (target->use_bpf)
> +	else if (target->use_bpf ||
> +		 evsel__match_bpf_counter_events(evsel->name))
>  		evsel->bpf_counter_ops = &bperf_ops;

with:
	else
		all_counters_use_bpf = false;

I was also thinking of oving it to evlist, but it's sat specific,
so I think it's good as static.. thanks for changing the implementation

jirka

>  
>  	if (evsel->bpf_counter_ops)
> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
> index 6bcb5ef221f8c..63d472b336de2 100644
> --- a/tools/perf/util/config.c
> +++ b/tools/perf/util/config.c
> @@ -18,6 +18,7 @@
>  #include "util/hist.h"  /* perf_hist_config */
>  #include "util/llvm-utils.h"   /* perf_llvm_config */
>  #include "util/stat.h"  /* perf_stat__set_big_num */
> +#include "util/evsel.h"  /* evsel__hw_names, evsel__use_bpf_counters */
>  #include "build-id.h"
>  #include "debug.h"
>  #include "config.h"
> @@ -460,6 +461,9 @@ static int perf_stat_config(const char *var, const char *value)
>  	if (!strcmp(var, "stat.no-csv-summary"))
>  		perf_stat__set_no_csv_summary(perf_config_bool(var, value));
>  
> +	if (!strcmp(var, "stat.bpf-counter-events"))
> +		evsel__bpf_counter_events = strdup(value);
> +
>  	/* Add other config variables here. */
>  	return 0;
>  }

SNIP