linux-kernel - Re: [PATCH 1/1] perf report: newt callgraphs

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Message-ID: <20100322211147.GQ2873@ghostprotocols.net>
Date:	Mon, 22 Mar 2010 18:11:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/1] perf report: newt callgraphs

Em Mon, Mar 22, 2010 at 05:52:49PM -0300, Arnaldo Carvalho de Melo escreveu:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> Starts collapsed, allows annotating by pressing 'A' or 'a' on the symbol, be it
> the top level one or any of the symbols in the chains.
> 
> It (ab)uses the only tree widget in newt, that is actually a checkbox tree that
> we use with just one option ('.'), end result is usable but we really need to
> create a custom widget tree so that we can use the data structures we have
> (hist_entry rb_tree + callchain rb_tree + lists), so that we reduce the memory
> footprint by not creating a mirror set of data structures in the
> newtCheckboxTree widget.
> 
> Thanks to Frédéric Weisbacker for fixing the orphanage problem in
> 301fde2, without that we were tripping a newt bug (fix already sent to
> newt's maintainer).

For the curious, here is a screenshot:

http://tglx.de/~acme/perf-newt-callgraph.png

- Arnaldo
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