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

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Message-ID: <87fvl4sl3p.fsf@sejong.aot.lge.com>
Date:	Wed, 23 Apr 2014 13:52:58 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
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

Hi Jiri,

On Tue, 22 Apr 2014 16:51:03 +0200, Jiri Olsa wrote:
> 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.

[SNIP]
>> +	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

Okay, so I changed it like below:

static void report__inc_stats(struct report *rep, struct hist_entry *he)
{
	/*
	 * The @he is either of a newly created one or an existing one
	 * merging current sample.  We only want to count a new one so
	 * checking ->nr_events being 1.
	 */
	if (he->stat.nr_events == 1)
		rep->nr_entries++;
}

This also eliminated the unneeded nr_samples field.

Thanks,
Namhyung
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