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

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Date:   Mon, 6 Jul 2020 16:10:14 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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 06.07.2020 15:37, Jiri Olsa wrote:
> 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);

Accepted. In v10.

Alexey