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

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Message-ID: <20150810225822.GH2521@kernel.org>
Date:	Mon, 10 Aug 2015 19:58:22 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, 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

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:
> > > > Hi Jiri,
> > > > 
> > > > On Sun, Aug 09, 2015 at 11:30:24AM +0200, Jiri Olsa wrote:
> > > > > On Sun, Aug 09, 2015 at 05:21:01PM +0900, Namhyung Kim wrote:
> > > > > > Currently perf TUI report browser doesn't support horizontal scrolling.
> > > > > > So if terminal width is smaller than the actual contents, there's no way
> > > > > > to see them.  This patch adds support horizontal movement by '<' and '>'
> > > > > > keys.
> > > > > 
> > > > > nice, I wonder we could also have some way to scroll
> > > > > by the column width.. it might be more eye friendly?
> > > > > would need to try first ;-)
> > > > 
> > > > Good suggesion.  Please see below..
> > > > 
> > > > > 
> > > > > I also tried it with SKIP_COLS_STEP=1, and it wasn't bad
> > > > 
> > > > OK.
> > > > 
> > > > > 
> > > > > how about having several scroll step options? like:
> > > > >      , . - SKIP_COLS_STEP=1
> > > > >      < > - SKIP_COLS_STEP=10
> > > > > CTRL-< > - SKIP_COLS_STEP=columns width
> > > > 
> > > > I tried to use CTRL but it seems not working.
> > > > 
> > > > 
> > > > > 
> > > > > we could also bind some of this to regular arrows
> > > > > with SHIFT or CTRL, bacause it's probably the most
> > > > > convenient binding for this
> > > > 
> > > > Yes, I agree with you.  But I don't know how to bind the arrow keys
> > > > with SHIFT or CTRL to do the thing.  So I just changed that < > to
> > > > make SKIP_COLS_STEP = column width.
> > 
> > > > From 8e1f0a8be36895f9f37df133dcc8020e123b76e9 Mon Sep 17 00:00:00 2001
> > > > From: Namhyung Kim <namhyung@...nel.org>
> > > > Date: Sun, 9 Aug 2015 19:25:32 +0900
> > > > Subject: [PATCH] perf hists browser: Move to prev/next column start by '<' or
> > > >  '>' keys
> > > > 
> > > > 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 :-)
 
> > 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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