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

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Date:   Thu, 25 Jun 2020 14:12:18 +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 24, 2020 at 04:39:11PM +0300, Alexey Budankov wrote:
> 
> 
> On 23.06.2020 17:54, Jiri Olsa wrote:
> > 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?
> 
> It is called from the main loop too and it is also additionally called here
> to provide indication and counter values on commands processing times.

so it prints interval out of order?

jirka