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

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Date:	Fri, 6 May 2011 10:54:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Liao <phyomh@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] Add inverted call graph report support to perf tool


* Sam Liao <phyomh@...il.com> wrote:

> > It depends if you select reverse callchain or not:
> >
> > $ perf report -s caller
> >
> > That will report main and kernel_thread as hists, and regular callee -> caller callchains.
> > Hence under main hist, you'll a lot of callchain starting from random points and all
> > ending in main!
> >
> > $ perf report -s caller -g caller
> >
> > That will report main and kernel_thread as hists, with callchains starting from
> > main under main.
> >
> > It becomes interesting when you want more granularity with -s caller,dso if we bring a way
> > to push forward the entrypoint one day. I suspect even more sorting combinations are
> > going to be interesting.
> >
> 
> Thanks for clarification. I'll try to come up with patches as you talked.

I'm wondering, is there any progress with this feature? Having sysprof-alike 
reverse ordering for call chains is a really powerful form of visualization 
IMO.

Thanks,

	Ingo
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