linux-kernel - Re: [PATCH 2/2] perf top: Handle 'z' key for toggle zeroing samples in TUI

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Date:	Tue, 19 Aug 2014 15:09:47 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Stephane Eranian <eranian@...gle.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>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 2/2] perf top: Handle 'z' key for toggle zeroing samples in TUI

On Wed, 13 Aug 2014 22:47:43 +0200, Stephane Eranian wrote:
> On Wed, Aug 13, 2014 at 10:37 PM, Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
>>
>> Em Wed, Aug 13, 2014 at 01:07:30AM +0200, Stephane Eranian escreveu:
>> > On Tue, Aug 12, 2014 at 10:16 AM, Namhyung Kim <namhyung@...nel.org> wrote:
>> > > The perf top TUI lacks 'z' key support to toggle sample zeroing.
>> > > Add it.
>> > >
>> > Works for me.
>> > Tested-by: Stephane Eranian <eranian@...gle.com>
>>
>> One thing that can be improved: Make it trigger a refresh in the right
>> after 'z' is pressed.
>>
>> Also, this toggles the zeroing before each sample, it would be nice to
>> have a visual cue that this is in effect, probably in the first line in
>> the screen, perhaps on the far right, something like [z] when this is in
>> effect and nothing when not.
>>
> I agree. Had to run a test on the side to verify that it was actually doing
> the right thing.
>
>>
>> Right now the way to figure this out is to observe the number of
>> samples, if it increases monotonically, zeroing before refresh is not in
>> effect, if it goes from a high number to a smaller or vice versa,
>> zeroing is in effect :-)
>>
>> Anyway, applied, people wanting this feature can figure this out, what I
>> suggested is just polishing.
>>
> We need to visual cue.

Got it.  Will add [z] on the header line.

Thanks,
Namhyung
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