linux-kernel - Re: [PATCH v8 09/13] perf stat: implement control commands handling

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Date:   Tue, 23 Jun 2020 16:54:58 +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 v8 09/13] perf stat: implement control commands handling

On Wed, Jun 17, 2020 at 11:41:30AM +0300, Alexey Budankov wrote:
> 
> Implement handling of 'enable' and 'disable' control commands
> coming from control file descriptor. process_evlist() function
> checks for events on control fds and makes required operations.
> If poll event splits initiated timeout interval then the reminder
> is calculated and still waited in the following poll() syscall.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/builtin-stat.c | 67 +++++++++++++++++++++++++++++----------
>  1 file changed, 50 insertions(+), 17 deletions(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index f88d5ee55022..cc56d71a3ed5 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -492,6 +492,31 @@ static bool process_timeout(int timeout, unsigned int interval, int *times)
>  	return print_interval(interval, times);
>  }
>  
> +static bool process_evlist(struct evlist *evlist, unsigned int interval, int *times)
> +{
> +	bool stop = false;
> +	enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
> +
> +	if (evlist__ctlfd_process(evlist, &cmd) > 0) {
> +		switch (cmd) {
> +		case EVLIST_CTL_CMD_ENABLE:
> +			pr_info(EVLIST_ENABLED_MSG);
> +			stop = print_interval(interval, times);

why is interval printed in here?

> +			break;
> +		case EVLIST_CTL_CMD_DISABLE:
> +			stop = print_interval(interval, times);

and here?

it should be called from the main loop when the interval time is elapsed no?

jirka