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

David Miller
2009-10-07T20:46:33Z

From: stephane eranian <eranian@googlemail.com>
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 :-)