Re: [PATCH] ia64 support for tools/perf/

Ingo Molnar
2009-11-18T19:39:33Z

* Peter Zijlstra <peterz@infradead.org> wrote:

> 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.

Yep, this is probably the least intrusive approach. Mixing the
implementations beyond trivial exclusion would probably be pain.

Ingo