linux-kernel - Re: [PATCH v1 3/5] perf, tools, script: Allow printing period for non freq mode groups

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Date:   Mon, 13 Nov 2017 10:11:58 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v1 3/5] perf, tools, script: Allow printing period for
 non freq mode groups

On Thu, Nov 09, 2017 at 06:55:26AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> When using leader sampling the values of the not sampled but counted
> events are shown by perf script in "period".
> 
> Currently printing period is only allowed when the main event
> has a period, that is it is in frequency mode.
> 
> This implies that we cannot dump the values of counted events
> when the leader event is not in frequency mode.
> 
> Just remove the check that the period must be set on all
> events. It will just be printed as 0 instead if it's not
> available.

it'll be the value of configured period, not 0

int perf_evsel__parse_sample(struct ...
  ...
  data->period = evsel->attr.sample_period;

  $ perf record -c 100000 
  $ perf script -F event,period | head -3
  Failed to open /tmp/perf-2048.map, continuing without symbols
      100000 cycles:ppp: 
      100000 cycles:ppp: 


other than that I think we can remove that check,
because we will have always sane number in period

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka