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

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Date:	Tue, 22 Apr 2014 18:43:11 +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>
> ---

SNIP

>  
>  		/* Non-group events are considered as leader */
>  		if (symbol_conf.event_group &&
> @@ -526,7 +533,7 @@ static u64 report__collapse_hists(struct report *rep)
>  
>  	ui_progress__finish();
>  
> -	return nr_samples;
> +	return rep->nr_samples;

so this ^^^ is the only usage for rep->nr_samples right?

and the output from report__collapse_hists is used
as a bool if we have at least 1 sample:

        nr_samples = report__collapse_hists(rep);

        if (session_done())
                return 0;

        if (nr_samples == 0) {
                ui__error("The %s file has no samples!\n", file->path);
                return 0;
        }

I think report__collapse_hists does not need to return anything
and above code could use (rep->nr_entries > 0) instead, like:

        report__collapse_hists(rep);

        if (session_done())
                return 0;

        if (rep->nr_entries == 0) {
                ui__error("The %s file has no samples!\n", file->path);
                return 0;
        }

and we could get rid of rep->nr_samples

thanks,
jirka
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