linux-kernel - Re: [PATCH] Add inverted call graph report support to perf tool

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Date:	Fri, 11 Mar 2011 11:45:08 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Sam Liao <phyomh@...il.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] Add inverted call graph report support to perf tool

Em Fri, Mar 11, 2011 at 11:51:22AM +0100, Frederic Weisbecker escreveu:
> On Thu, Mar 10, 2011 at 07:48:16AM +0100, Ingo Molnar wrote:
> > * Frederic Weisbecker <fweisbec@...il.com> wrote:

> > > But your idea of turning the callee into the caller would show us a very global 
> > > profiling. With reverse callchains it can be a very nice overview of the big 
> > > picture.

> > Very much agreed - i think that matches the sysprof display structure as well, 
> > right?

> Yeah indeed, IIRC.

> > This could then be propagated not just into perf report but perf top --tui as well.

> Probably yeah. Are callchains already supported by perf top?

No, they arent, the move to get 'struct hist_entry' (used by report) and 'struct
sym_entry' (used by top) is underway, I want to merge the hists browser
with the top browser, at that point it all becomes just one tool:

start with 'perf top'

press F -> freeze:

it becomes 'perf report'

in both modes press 'A' and you get annotation, if in top mode, live, if
in 'report' mode, static.

Having this all integrated and easily switched to/from various modes is
what, in my view, makes the TUI (and GUI at some point) compelling.

- Arnaldo
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