Date: Fri, 10 Jan 2014 10:40:56 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Will Deacon <will.deacon@arm.com>,
        Chad Paradis <chad.paradis@umit.maine.edu>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Stephane Eranian <eranian@gmail.com>
Subject: Re: [patch/rfc] perf on raspberry-pi without overflow interrupt
Message-ID: <20140110094056.GK31570@twins.programming.kicks-ass.net>
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 <alpine.DEB.2.10.1401082245120.22965@vincent-weaver-1.um.maine.edu>
 <20140109101921.GA26435@mudshark.cambridge.arm.com>
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On Thu, Jan 09, 2014 at 11:08:47PM -0500, Vince Weaver wrote:
> On Thu, 9 Jan 2014, Will Deacon wrote:
> 
> > I'd rather see it in the generic code if at all possible. Maybe we could add
> > a flags field to perf_pmu_register?
> 
> I can look into adding the check in generic code.

Adding something like this to the generic code would mean adding a
struct pmu capabilities field and visiting all existing PMU
implementations to properly fill this out.

There's a number of hardware PMU implementations that do not have an
interrupt and would need to set this flag.
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