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

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Message-ID: <20110615222402.GB18579@somewhere.redhat.com>
Date:	Thu, 16 Jun 2011 00:24:05 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Sam Liao <phyomh@...il.com>, Arun Sharma <asharma@...com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] [perf] Add inverted call graph report support.

On Wed, Jun 15, 2011 at 10:15:18AM +0200, Ingo Molnar wrote:
> 
> * Sam Liao <phyomh@...il.com> wrote:
> 
> > On Wed, Jun 15, 2011 at 6:15 AM, Arun Sharma <asharma@...com> wrote:
> > > Sam,
> > >
> > > $ perf report -g graph,0.5,caller --sort pid
> > >
> > > is a bit hard to type. Perhaps add a simpler command line option
> > > that has the same effect?
> > >
> > >  -Arun
> > >
> > >
> > 
> > How about perf report -g [caller/callee,][graph,0.1] -s pid
> > 
> > or remove the order of the options for "-g"
> 
> We could alias the -G flag to the inverse graph.

Agreed.
-g could map to fine tuning of callchain parameters like it does right now
and we can use -G as a shortcut for inverted callchain keeping the default
settings.
 
> Plus it would be nice to allow a .perfconfig flag for people to 
> configure their desired default reporting parameters.

Yeah.

It would be also nice to have a "caller" sorting mode:

	perf report -G -s caller

This can be useful to get the entire tree of calls for each callers.
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