linux-kernel - Re: [PATCH 0/2] perf newt: Zoom operations

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Date:	Sun, 4 Apr 2010 21:05:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 0/2] perf newt: Zoom operations


* Arnaldo Carvalho de Melo <acme@...radead.org> wrote:

> Em Sun, Apr 04, 2010 at 11:58:27AM +0200, Ingo Molnar escreveu:
> > * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> > > Arnaldo Carvalho de Melo (2):
> > >   perf newt: Add a "Zoom into foo.so DSO" and reverse operations
> > >   perf TUI: Add a "Zoom into COMM(PID) thread" and reverse operations
> > 
> > Pulled, thanks Arnaldo!
> > 
> > There's still a few basic usability glitches that i've noticed:
> > 
> >  - it's not clear how to zoom out, once zoomed in
> 
> I'll use the title line to store the name of the DSO and Thread and the help 
> line to state that to zoom out, press -> + zoom out, and I think that it is 
> a good idea to use 'd' and 'D' to zoom in/out of DSOs and 't' and 'T' to 
> zoom in/out of DSOs.

Cool, a help line will do the trick i'm sure. The only problem situation is 
when there is zero information about how to proceed - some people exit and 
dont ever come back in that case :-)

> >  - there's no help screen and no help line for people to see what can be 
> >    done on a given screen. While it's good that the intuitive things work
> >    by default (arrow keys, escape, enter, etc.), there should also be additional
> >    visual information about what can be done.
> 
> F1 and textboxes with a short description of what can be done given for the 
> first time or till the user presses "Suppress these info boxes" will be 
> added.

Maybe we need 'h' and '?' in addition of F1, as F1 is often already mapped and 
caught by the terminal (it is so with gnome-terminal).

>  
> >  - i think double escape should exit, right now it stays at the 'are you sure'
> >    screen
> 
> Here I thought that something had to be done to avoid that accidentally 
> pressing ESC two times or having "Yes" as default option, trowing away 
> possibly a long processed session, what do others think about it?

Yeah, i think you are right.

> I think that ESC + "Yes" as a default may be ok, as two keys need to be 
> pressed (ESC + Enter), enough warning/confirmation, I gues, right?

Ok, that would work!

Thanks,

	Ingo
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