Re: [PATCH 2/2] perf_events: add event constraints support forIntel processors

[David Miller]

From: stephane eranian <eranian@xxxxxxxxxxxxxx>
Date: Wed, 7 Oct 2009 14:31:58 +0200

> What PPC does is probably the only way to do this given the interface between
> generic and machine-specific code. The one advantage I see is that it works
> inside an event group but also across event groups because that code does not
> look at group boundary, it only looks at the events and the number of available
> registers. The downside is that you duplicate state.
> 
> Did I get this right, Paul?

That's basically how his code works, yes.  I intend on duplicating
it to some extent on sparc64 since I'm operating in a similar
problem space.

So if at least some of this engine went to a generic place, there'd
be at least a 3rd user :-)
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