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

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Message-ID: <20140105162650.GC10018@krava.brq.redhat.com>
Date:	Sun, 5 Jan 2014 17:26:50 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
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 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)
>  	if (he != NULL) {
>  		*he = *template;
>  
> +		if (symbol_conf.cumulate_callchain) {
> +			he->stat_acc = malloc(sizeof(he->stat));
> +			if (he->stat_acc == NULL) {
> +				free(he);
> +				return NULL;
> +			}
> +			memcpy(he->stat_acc, &he->stat, sizeof(he->stat));
> +		}
> +
>  		if (he->ms.map)
>  			he->ms.map->referenced = true;
>  
> @@ -295,6 +306,7 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template)
>  			 */
>  			he->branch_info = malloc(sizeof(*he->branch_info));
>  			if (he->branch_info == NULL) {
> +				free(he->stat_acc);

probably not big deal but above free should be under
symbol_conf.cumulate_callchain check..

jirka
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