linux-kernel - Re: [RFC 0/7] perf report/gtk: Add support for hierarchy view

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Date:	Wed, 22 May 2013 11:45:11 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 0/7] perf report/gtk: Add support for hierarchy view

On 05/21/2013 10:26 AM, Namhyung Kim wrote:
> On Tue, 21 May 2013 10:04:05 +0300, Pekka Enberg wrote:
>> Hello,
>>
>> On Tue, May 21, 2013 at 9:14 AM, Namhyung Kim <namhyung@...nel.org> wrote:
>>> This patchset implements a new feature that collects hist entries in a
>>> hierachical manner.  That means lower-level entries are belonged to an
>>> upper-level entry.  The entry hierachy is built on the sort keys
>>> given, so users can set it whatever they want.  It only shows
>>> top-level entries first, and user can expand/collapse it dynamically.
>>>
>>> This is only implemented in --gtk currently, since it's well-matched
>>> to the GTK tree view widget and I didn't want to be bothered with the
>>> TUI browser code at this stage. :)
>>
>> Can use this infrastructure to support call-graphs in the GTK UI?
>
> Yes, I think it's doable.  I don't have an idea how to use both of the
> features at the same time though.  Anyway, I'll try to add support for
> callchains later.

So I think hierarchy view makes tons of sense but it needs to be 
orthogonal with call-graphs. Preferably in such a way that if you have 
both hierarchy view and call-graphs enabled, you can seamlessly drill 
down from process level all the way to call-graph leaf nodes.

			Pekka
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