linux-kernel - Re: [PATCH 03/21] perf hists: Add support for accumulated stat of hist entry

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Date:	Mon, 06 Jan 2014 17:10:45 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arun Sharma <asharma@...com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rodrigo Campos <rodrigo@...g.com.ar>
Subject: Re: [PATCH 03/21] perf hists: Add support for accumulated stat of hist entry

On Sun, 5 Jan 2014 17:45:46 +0100, Jiri Olsa wrote:
> On Tue, Dec 24, 2013 at 05:22:09PM +0900, Namhyung Kim wrote:
>> From: Namhyung Kim <namhyung.kim@....com>
>> 
>> Maintain accumulated stat information in hist_entry->stat_acc if
>> symbol_conf.cumulate_callchain is set.  Fields in ->stat_acc have same
>> vaules initially, and will be updated as callchain is processed later.
>> 
>> Cc: Arun Sharma <asharma@...com>
>> Cc: Frederic Weisbecker <fweisbec@...il.com>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>>  tools/perf/util/hist.c   | 18 ++++++++++++++++++
>>  tools/perf/util/sort.h   |  1 +
>>  tools/perf/util/symbol.h |  1 +
>>  3 files changed, 20 insertions(+)
>> 
>> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
>> index 283aa1972b4f..b61e2fa42412 100644
>> --- a/tools/perf/util/hist.c
>> +++ b/tools/perf/util/hist.c
>> @@ -237,6 +237,8 @@ static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
>>  		return true;
>>  
>>  	he_stat__decay(&he->stat);
>> +	if (symbol_conf.cumulate_callchain)
>> +		he_stat__decay(he->stat_acc);
>>  
>>  	if (!he->filtered)
>>  		hists->stats.total_period -= prev_period - he->stat.period;
>> @@ -284,6 +286,15 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template)
>
> there's callchain size computation in here:
>         size_t callchain_size = symbol_conf.use_callchain ?  sizeof(struct callchain_root) : 0;
>
> I wonder we could make it zero for symbol_conf.cumulate_callchain

The plan is to support callchain with --children enabled. :)

Thanks,
Namhyung
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