Re: [PATCH 06/12] perf report/top: Add 'k' hotkey to zoom directly into the kernel map

[Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>]

Em Fri, Dec 20, 2019 at 03:48:23PM +0900, Namhyung Kim escreveu:
> On Tue, Dec 17, 2019 at 11:49 PM Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > As a convenience, equivalent to pressing Enter in a line with a kernel
> > symbol and then selecting "Zoom" into the kernel DSO.
 
> We already have 'd' key for 'zoom into current dso'.

Right, current DSO, 'k' is equivalent to:

1. Navigate to a kernel map entry
2. Press 'd'

And also to:

1. Navigate to a kernel map entry
2. Press ENTER
3. Navigate to "Zoom into Kernel DSO"
4. Press ENTER

One key versus 2 or four.

> Do you really want 'k' for kernel specially?

I thought kernel hackers would like the convenience, doing:

  perf top + k

To get the main kernel samples looks faster than:

  perf top -e cycles:k

And those are not even equivalent, as cycles:k will show everything in
ring 0, while 'perf top + k' will show just what is in the kernel _and_
in the main kernel map.

- Arnaldo