linux-kernel - Re: [PATCH v5 5/5] perf stat: Report summary for interval mode

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Date:   Mon, 18 May 2020 14:47:32 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v5 5/5] perf stat: Report summary for interval mode

On Thu, May 14, 2020 at 01:36:38PM +0800, Jin Yao wrote:

SNIP

>  
>  	evlist__for_each_entry(evsel_list, counter) {
>  		if (counter->err)
> @@ -394,6 +403,7 @@ static void runtime_stat_reset(struct perf_stat_config *config)
>  static void process_interval(void)
>  {
>  	struct timespec ts, rs;
> +	struct stats walltime_nsecs_stats_bak;
>  
>  	clock_gettime(CLOCK_MONOTONIC, &ts);
>  	diff_timespec(&rs, &ts, &ref_time);
> @@ -407,9 +417,11 @@ static void process_interval(void)
>  			pr_err("failed to write stat round event\n");
>  	}
>  
> +	walltime_nsecs_stats_bak = walltime_nsecs_stats;
>  	init_stats(&walltime_nsecs_stats);
>  	update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
>  	print_counters(&rs, 0, NULL);
> +	walltime_nsecs_stats = walltime_nsecs_stats_bak;

could we instead of above initialize walltime_nsecs_stats
in the condition below, like:

	init_stats(&walltime_nsecs_stats);
	update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);

jirka

>  }
>  
>  static void enable_counters(void)
> @@ -765,6 +777,19 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
>  
>  	update_stats(&walltime_nsecs_stats, t1 - t0);
>  
> +	if (interval) {
> +		stat_config.interval = 0;
> +		stat_config.summary = true;
> +
> +		if (stat_config.aggr_mode == AGGR_GLOBAL)
> +			perf_evlist__save_aggr_prev_raw_counts(evsel_list);
> +
> +		perf_evlist__copy_prev_raw_counts(evsel_list);
> +		perf_evlist__reset_prev_raw_counts(evsel_list);
> +		runtime_stat_reset(&stat_config);
> +		perf_stat__reset_shadow_per_stat(&rt_stat);
> +	}
> +

SNIP