Re: [patch] Performance Counters for Linux, v2

[Andi Kleen]

On Wed, Dec 10, 2008 at 03:44:31PM +1100, Paul Mackerras wrote:
> Andi Kleen writes:
> 
> > When you say counting you should also include "event ring buffers with
> > metadata", like PEBS on Intel x86. 
> 
> I'm not familiar with PEBS.  Maybe it's something different again,
> neither sampling nor counting, but a third thing?

Yes it's a third thing. A CPU controlled ring event buffer. See Stephane's 
description.

There's also some crosses, e.g. AMD's IBS (which is essentially a counter +
some additional registers to give more details about the interrupted
instruction)

-Andi

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