linux-kernel - Re: [PATCH 3/6] perf tools: Save column length in perf_hpp

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Date:	Fri, 25 Jul 2014 00:46:25 +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>
Subject: Re: [PATCH 3/6] perf tools: Save column length in perf_hpp_fmt

On Thu, Jul 24, 2014 at 9:10 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Wed, Jul 09, 2014 at 02:28:11PM +0900, Namhyung Kim wrote:
>> Save column length in the hpp format and pass it to print functions.
>> This is a preparation for users to control column width in the output.
>
> SNIP
>
>> +
>> +void perf_hpp__reset_width(struct perf_hpp_fmt *fmt, struct hists *hists)
>> +{
>> +     int idx;
>> +
>> +     if (perf_hpp__is_sort_entry(fmt))
>> +             return perf_hpp__reset_sort_width(fmt, hists);
>> +
>> +     for (idx = 0; idx < PERF_HPP__MAX_INDEX; idx++) {
>> +             if (fmt == &perf_hpp__format[idx])
>> +                     break;
>> +     }
>> +
>> +     if (idx == PERF_HPP__MAX_INDEX)
>> +             return;
>> +
>> +     switch (idx) {
>> +     case PERF_HPP__OVERHEAD:
>> +     case PERF_HPP__OVERHEAD_SYS:
>> +     case PERF_HPP__OVERHEAD_US:
>> +     case PERF_HPP__OVERHEAD_ACC:
>> +             fmt->len = 8;
>> +             break;
>> +
>> +     case PERF_HPP__OVERHEAD_GUEST_SYS:
>> +     case PERF_HPP__OVERHEAD_GUEST_US:
>> +             fmt->len = 9;
>> +             break;
>
> just curious.. why is it 9 for guest %, while we use 8 for host?
> I understand that was the current state

It's the strlen of header - "guest sys". :)

Thanks,
Namhyung
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