linux-kernel - Re: [PATCH 3/9] perf hists: Add support for showing relative percentage

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Date:	Wed, 19 Mar 2014 00:18:00 +0000
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	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>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 3/9] perf hists: Add support for showing relative percentage

Hi Arnaldo,

On Tue, Mar 18, 2014 at 8:08 PM, Arnaldo Carvalho de Melo
<acme@...stprotocols.net> wrote:
> Em Mon, Mar 10, 2014 at 04:43:54PM +0900, Namhyung Kim escreveu:
>> @@ -695,12 +695,17 @@ static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h
>>       if (h->filtered)
>>               return;
>>
>> -     ++hists->nr_entries;
>> -     if (h->ms.unfolded)
>> +     hists->nr_entries++;
>> +     hists->nr_non_filtered_entries++;
>
> Why not keep existing practice? prefix or suffix generates the same
> code, changing it from prefix to suffix increment just adds noise to the
> patch :-\

Argh, sorry - I couldn't resist changing it.  Won't do that in the future. :-/

>
> Also, this is why I was asking about nr_entries and total_period being
> invariant, looking at this function we can see it is _not_ invariant, as
> when we apply/remove filters we touch them.
>
> This is why I made the comment (in a private conversation) about having
> a invariant_total_period invariant_nr_entries pair (I think I used some
> other naming) while knowing that the existing variables nr_entries and
> total_period are actually subjected to the filters being used.
>
> I.e. to avoid confusion we need to make total_entries and nr_entries
> never change when a filter is applied, touching only two new variables
> for non_filtered total_period and nr_entries.
>
> I'll try doing it if you don't do it first, but will first process some
> more patches and submit what I already processed.

Please see the next patch 4/9 ("perf report: Add --percentage option")
doing that.  What I did in this patch is just adding new
non_filtered_* fields and not changing existing behavior.  And in the
next patch, the total_period and nr_entries will become invariant.

Do you want to split the patch 4/9 or merge a part of it into this?

Thanks,
Namhyung
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