Messages in this thread | | | Date | Thu, 16 Jan 2014 12:13:10 -0500 (EST) | From | Vince Weaver <> | Subject | Re: [patch/rfc] perf on raspberry-pi without overflow interrupt |
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On Tue, 14 Jan 2014, Peter Zijlstra wrote:
> On Mon, Jan 13, 2014 at 11:55:17PM -0500, Vince Weaver wrote:
> > I don't see an existing pmu capabilities struct... or do you mean > > coming up with one? > > Yeah, adding one.
So would it be a struct, or just an integer with flags?
> > Would it only hold an "overflow_interrupt_available" flag, or are > > there other generic capabilities it would be handy to know about? > > Possible (other) flags could be: > > PMU_HAS_INT -- would allow sampling events > PMU_HAS_PRECISE -- would allow any ::precise value > PMU_HAS_FILTER -- would allow all os/user/etc. flags
should we export these to userspace somehow?
It would be handy to be able to tell you're getting EOPNOTSUP because PMU_HAS_INT is not set for your pmu, rather than trying to guess why things are failing.
Vince
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