linux-kernel - Re: [patch V2 26/28] x86/perf/intel/rapl: Convert it to a per package facility

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Message-ID: <20160222120818.GD6357@twins.programming.kicks-ass.net>
Date:	Mon, 22 Feb 2016 13:08:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Borislav Petkov <bp@...en8.de>,
	Stephane Eranian <eranian@...gle.com>,
	Harish Chegondi <harish.chegondi@...el.com>,
	Kan Liang <kan.liang@...el.com>,
	Andi Kleen <andi.kleen@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [patch V2 26/28] x86/perf/intel/rapl: Convert it to a per
 package facility

On Mon, Feb 22, 2016 at 11:07:02AM -0000, Thomas Gleixner wrote:
> +static inline struct rapl_pmu *cpu_to_rapl_pmu(unsigned int cpu)
> +{
> +	return rapl_pmus->pmus[topology_logical_package_id(cpu)];
> +}

> @@ -370,6 +378,7 @@ static int rapl_pmu_event_init(struct pe
>  		return -EINVAL;
>  
>  	/* must be done before validate_group */
> +	pmu = cpu_to_rapl_pmu(event->cpu);
>  	event->cpu = pmu->cpu;
>  	event->pmu_private = pmu;

This again looks like pmu_private is 'trivially' replacable with
something like:

static inline struct rapl_pmu *event_to_rapl_pmu(struct perf_event *event)
{
	return cpu_to_rapl_pmu(event->cpu);
}