linux-kernel - Re: [tip:perfcounters/core] perf record/report: Add call graph / call chain profiling

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Date:	Wed, 17 Jun 2009 09:29:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, penberg@...helsinki.fi,
	efault@....de, arjan@...radead.org, tglx@...utronix.de,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf record/report: Add call graph /
 call chain profiling

On Tue, 2009-06-16 at 04:57 +0200, Frederic Weisbecker wrote:
> > +struct ip_chain_event {
> > +     __u16 nr;
> 
> 
> 
> Is it needed to have the nr encoded in the ip_chain?
> We can already find it by doing kernel + user.

strictly speaking: hv+kernel+user
but yeah, we could possibly replace it with another context, guest
perhaps.

suggestions anyone?

> 
> > +     __u16 hv;
> > +     __u16 kernel;
> > +     __u16 user;
> > +     __u64 ips[];
> > +};

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