linux-kernel - Re: [patch/rfc] perf on raspberry-pi without overflow interrupt

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Message-ID: <20140110094056.GK31570@twins.programming.kicks-ass.net>
Date:	Fri, 10 Jan 2014 10:40:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Will Deacon <will.deacon@....com>,
	Chad Paradis <chad.paradis@...t.maine.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Stephane Eranian <eranian@...il.com>
Subject: Re: [patch/rfc] perf on raspberry-pi without overflow interrupt

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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