linux-kernel - Re: [PATCH v4 2/2] perf stat: add interval printing

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Message-ID: <87txq9kdw3.fsf@sejong.aot.lge.com>
Date:	Tue, 22 Jan 2013 14:03:40 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo\@elte.hu" <mingo@...e.hu>,
	"ak\@linux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH v4 2/2] perf stat: add interval printing

Hi Stephane,

On Mon, 21 Jan 2013 13:38:29 +0100, Stephane Eranian wrote:
> On Mon, Jan 21, 2013 at 3:53 AM, Namhyung Kim <namhyung@...nel.org> wrote:
>> AFAICS the only caller of print_stat() is cmd_stat() and it'll call this
>> only if interval is 0.  So why not just setting prefix to NULL then?
>>
> I don't understand your point here. Prefix is set ONLY when interval
> is non zero. Prefix is setup before print_counter() so that each counter
> for each interval is timestamped with the same value.

Please see below.


>>> -     if (status != -1)
>>> +     if (status != -1 && !interval)
>>>               print_stat(argc, argv);

Here, print_stat() is called only if interval is 0.  So no need to check
the interval inside the print_stat(), right?

Thanks,
Namhyung
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