linux-kernel - Re: [PATCH 1/9] perf report: Count number of entries and samples separately

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Date:	Tue, 22 Apr 2014 16:51:03 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 1/9] perf report: Count number of entries and samples
 separately

On Tue, Apr 22, 2014 at 05:49:43PM +0900, Namhyung Kim wrote:
> Those stats are counted counted in multiple places so that they can
> confuse readers of the code.  This is a preparation of later change
> and do not intend any functional difference.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-report.c | 37 ++++++++++++++++++++++---------------
>  1 file changed, 22 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 76e2bb6cf571..375fc504386e 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -57,6 +57,8 @@ struct report {
>  	const char		*cpu_list;
>  	const char		*symbol_filter_str;
>  	float			min_percent;
> +	u64			nr_entries;
> +	u64			nr_samples;
>  	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
>  };
>  
> @@ -121,6 +123,12 @@ static int report__add_mem_hist_entry(struct report *rep, struct addr_location *
>  			goto out;
>  	}
>  
> +	rep->nr_samples++;
> +	if (he->stat.nr_events == 1) {
> +		/* count new entries only */
> +		rep->nr_entries++;
> +	}
> +
>  	evsel->hists.stats.total_period += cost;
>  	hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
>  	if (!he->filtered)
> @@ -176,6 +184,12 @@ static int report__add_branch_hist_entry(struct report *rep, struct addr_locatio
>  					goto out;
>  			}
>  
> +			rep->nr_samples++;
> +			if (he->stat.nr_events == 1) {
> +				/* count new entries only */
> +				rep->nr_entries++;
> +			}
> +
>  			evsel->hists.stats.total_period += 1;
>  			hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
>  			if (!he->filtered)
> @@ -212,6 +226,12 @@ static int report__add_hist_entry(struct report *rep, struct perf_evsel *evsel,
>  	if (ui__has_annotation())
>  		err = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
>  
> +	rep->nr_samples++;
> +	if (he->stat.nr_events == 1) {
> +		/* count new entries only */
> +		rep->nr_entries++;
> +	}

smeels like we could use function for this ^^^

also it took me a while to figure out the reason for the condition,
maybe there could be more comment about that

thanks,
jirka
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