linux-kernel - Re: [PATCH v9 11/15] perf stat: implement control commands handling

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Date:   Mon, 6 Jul 2020 14:37:43 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 11/15] perf stat: implement control commands handling

On Fri, Jul 03, 2020 at 10:47:22AM +0300, Alexey Budankov wrote:

SNIP

>  
>  	while (1) {
>  		if (forks)
> @@ -574,11 +610,22 @@ static int dispatch_events(bool forks, int timeout, int interval, int *times, st
>  		if (done || stop || child_exited)
>  			break;
>  
> -		nanosleep(ts, NULL);
> -		if (timeout)
> -			stop = true;
> -		else
> -			stop = handle_interval(interval, times);
> +		clock_gettime(CLOCK_MONOTONIC, &time_start);
> +		if (!(evlist__poll(evsel_list, time_to_sleep) > 0)) { /* poll timeout or EINTR */
> +			if (timeout)
> +				stop = true;
> +			else
> +				stop = handle_interval(interval, times);
> +			time_to_sleep = sleep_time;
> +		} else { /* fd revent */
> +			stop = process_evlist(evsel_list, interval, times);
> +			clock_gettime(CLOCK_MONOTONIC, &time_stop);
> +			diff_timespec(&time_diff, &time_stop, &time_start);
> +			time_to_sleep -= time_diff.tv_sec * MSEC_PER_SEC +
> +					 time_diff.tv_nsec / NSEC_PER_MSEC;
> +			if (time_to_sleep < 0)
> +				time_to_sleep = 0;

could this computation go to a separate function? something like:

time_to_sleep = compute_tts(time_start, time_stop);

thanks,
jirka