linux-kernel - Re: [PATCH 1/2] perf x86: Make intel_pmu_enable

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Message-ID: <20130815135314.GE19750@two.firstfloor.org>
Date:	Thu, 15 Aug 2013 15:53:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/2] perf x86: Make intel_pmu_enable_all to enable only
 active events

> 
> I think its a NOP; this is the global ctrl register but
> intel_pmu_disable_event() writes PERFEVTSELx.EN = 0, so even if you
> enable it in the global mask, the event should still be disabled.

Yes the hardware ANDs the various enable bits in the different
registers.

-andi
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