linux-kernel - Re: [PATCH V3 1/1] perf hists: clear dummy entry accumulated period

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Date:	Mon, 25 Apr 2016 20:26:52 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	kan.liang@...el.com, namhyung@...nel.org, jolsa@...nel.org,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/1] perf hists: clear dummy entry accumulated period

Em Mon, Apr 25, 2016 at 08:15:00PM +0200, Jiri Olsa escreveu:
> On Sun, Apr 24, 2016 at 11:28:09PM -0700, kan.liang@...el.com wrote:
> > From: Kan Liang <kan.liang@...el.com>
> > 
> > The accumulated period for dummy entry should also be 0.
> > Otherwise, the total overhead could be overcounted.
> > [perf]$ perf record -e '{LLC-load-misses,cpu/instructions/}'
> > --call-graph=lbr ./tchain
> > [perf]$ perf report --stdio
> >  # To display the perf.data header info, please use
> >  --header/--header-only options.
> >  #
> >  #
> >  # Total Lost Samples: 0
> >  #
> >  # Samples: 21K of event 'anon group { LLC-load-misses,
> > cpu/instructions/
> >  }'
> >  # Event count (approx.): 16313667937
> >  #
> >  #         Children              Self  Command      Shared Object
> >  Symbol
> >  # ................  ................  ...........  ................
> >  ............................
> >  #
> >    4769.98%   0.01%     0.00%   0.01%  tchain_edit  [kernel.vmlinux]
> >  [k] update_fast_timekeeper
> >    4356.18%   0.01%     0.00%   0.01%  tchain_edit  [kernel.vmlinux]
> >  [k] trigger_load_balance
> >    3181.12%   0.01%     0.00%   0.01%  tchain_edit  [kernel.vmlinux]
> >  [k] irq_work_tick
> >    1592.37%   0.00%     0.00%   0.00%  tchain_edit  [kernel.vmlinux]
> >  [k] cpu_needs_another_gp
> > 
> > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > ---
> > 
> > Changes since V2:
> >  - Use symbol_conf.cumulate_callchain check for existance of he->stat_acc 
> > Changes since V1:
> >  - check he->stat_acc. Because it only be available when option children is set
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, applied.

- Arnaldo