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

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Date:	Fri, 11 Mar 2011 13:07:25 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Sam Liao <phyomh@...il.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...hat.com, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] Add inverted call graph report support to perf tool

On Fri, Mar 11, 2011 at 12:57:01PM +0100, Frederic Weisbecker wrote:
> On Thu, Mar 10, 2011 at 10:32:43PM +0800, Sam Liao wrote:
> >  the sysprof that Ingo mentioned.
> 
> sysprof does something like that?
> 
> Note, another reason to avoid abusing the event.ip to group
> per caller, is that we could be able to:
> 
> perf report -s caller,sym -g caller
> 
> If we limit callchains to start from a given foo.so, this may
> sort hists per caller and then per endpoint.
> 
> If your library offers function func1, func2, etc... It will sort
> them per usage (func1 has been first used, then func2, etc...)

I meant func1 has been the most used, then came func2, etc...

> then per endpoint overhead (func1 most often sticks in strcpy(),
> then on read(), etc....).
> 
> Right?
> 
> That may or may not be useful. I don't know. In fact I don't
> want to take the responsibility to judge whether it's useful
> or not. Thus I prefer caller and ip to be two different
> properties of hist entries and not having one absusing the
> other, so that we don't prevent this feature to exist (or many
> other sort combinations I haven't imagined).
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