linux-kernel - RE: [PATCH] ia64 support for tools/perf/

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Date:	Wed, 18 Nov 2009 17:56:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ia64 support for tools/perf/

On Tue, 2009-11-17 at 09:25 -0800, Luck, Tony wrote:
> > Btw., are you planning HAVE_PERF_EVENTS support for IA64? (It's nice 
> > stuff, i can only recommend it! ;-)
> 
> My first goal is getting the s/w events hooked up and working.  I'm still
> wondering about how to get the h/w counters to co-exist with perfmon (which
> has been part of ia64 API for many years).

A first approach could be to make them mutually exclusive at runtime.
When there's a perf_event user, perfmon users get FAIL and vs.

This is basically the state for x86 perf_event vs oprofile atm.

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