linux-kernel - Re: [PATCH 2/2] perf: SNB exclusive PMU access for INST_RETIRED:PREC

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Message-ID: <20121019154958.GY2095@tassilo.jf.intel.com>
Date:	Fri, 19 Oct 2012 08:49:58 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	acme@...hat.com, jolsa@...hat.com
Subject: Re: [PATCH 2/2] perf: SNB exclusive PMU access for
 INST_RETIRED:PREC_DIST

> +	/*
> +	 * for INST_RETIRED.PREC_DIST to work correctly with PEBS, it must
> +	 * be measured alone on SNB (exclusive PMU access) as per Intel SDM.
> +	 */
> +	if ((cfg & INTEL_ARCH_EVENT_MASK) == 0x01c0 && !event->attr.exclusive) {
> +		pr_info("perf: INST_RETIRED.PREC_DIST only works in exclusive mode\n");
> +		return -EINVAL;
> +	}


Strictly you have to check for precise too, right?

-Andi
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