linux-kernel - Re: [PATCH v2 1/2] perf hists browser: Support horizontal scrolling with '<' and '>' key

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Date:	Tue, 11 Aug 2015 11:00:34 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v2 1/2] perf hists browser: Support horizontal scrolling
 with '<' and '>' key

Hi Arnaldo,

On Mon, Aug 10, 2015 at 07:58:22PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Aug 11, 2015 at 12:46:03AM +0200, Jiri Olsa escreveu:
> > On Mon, Aug 10, 2015 at 12:50:04PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Sun, Aug 09, 2015 at 01:21:39PM +0200, Jiri Olsa escreveu:
> > > > On Sun, Aug 09, 2015 at 07:35:42PM +0900, Namhyung Kim wrote:
> > > > > Jiri said that it'd be more eye-friendly if it can move by column
> > > > > widths.  So change the keys to do it rather than jumping 10 characters.
> > > > > Also add ',' and '.' keys which reside same position in the keyboard to
> > > > > move by 1 characters.
> > > > 
> > > > I like it ;-)
> > > 
> > > Humm, I don't, its not natural, I doubt anyone will think about using ,
> > > and . to move by one character right/left, ditto for <>, I think we
> > > should just recover <- and -> (left and right arrows) for navigation,
> > > leave ENTER to be what -> was doing and esc for what <- does, in fact it
> > > is already like that.
> > 
> > I would ;-) anyway I also think arrows are the best, but I thought we
> > dont want to break existing interface much
> 
> In this case I think we can, enter and esc are really well know keys for
> entering and escaping from a place, and we have them working forever
> doing that, its just that at some time I used <- as an alias for ESC and
> -> as alias for ENTER.
> 
> I.e. for people using ESC and ENTER, this will not be noticed :-)

Yes, but I guess many people use arrow keys more than ESC and ENTER
since we use up/down arrow keys anyway.  I do want to use left/right
arrow for scrolling, but I'm afraid that it'll bother existing users..

Thanks,
Namhyung


>  
> > > Probably using shift or control or alt + <- -> for moving one column at
> > > at time is enough, but humm, is there value in that?
> > 
> > it'd really help for perf mem output, which is quite wide.. and we probably
> > have more wide outputs, or users with narrow terminals ;-)
> 
> I'm not going against horizontal scrolling, it is needed, sure thing,
> its surprising we are doing this only now. What I am asking is this fine
> scrolling of one column per <- or -> keypress, but I really need to try
> it with things like 'perf mem', I thought that when you pressed '>', in
> this patch, it would move entire sort key columns, not just one vertical
> column one character wide, right?
> 
> - Arnaldo
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