linux-kernel - Re: [PATCH v3 3/4] perf,x86: add Intel RAPL PMU support

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Message-ID: <20131025111359.GB1219@krava.redhat.com>
Date:	Fri, 25 Oct 2013 13:13:59 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, zheng.z.yan@...el.com,
	bp@...en8.de
Subject: Re: [PATCH v3 3/4] perf,x86: add Intel RAPL PMU support

On Wed, Oct 23, 2013 at 02:58:04PM +0200, Stephane Eranian wrote:

SNIP

> +			pmu = per_cpu(rapl_pmu, i);
> +			if (pmu) {
> +				per_cpu(rapl_pmu, cpu) = pmu;
> +				atomic_inc(&pmu->refcnt);
> +			}
> +			continue;
> +		}
> +		rapl_cpu_prepare(cpu);
> +		cpumask_set_cpu(cpu, &rapl_cpu_mask);
> +	}
> +
> +	perf_cpu_notifier(rapl_cpu_notifier);

hum, this should be rather called below only if we succeed
with the perf_pmu_register

> +
> +	ret = perf_pmu_register(&rapl_pmu_class, "power", -1);
> +	WARN_ON(ret);
> +	if (!ret) {
> +		pr_info("RAPL PMU detected, registration failed, RAPL PMU disabled\n");
> +		put_online_cpus();
> +		return -1;
> +	}
> +
> +	pmu = __get_cpu_var(rapl_pmu);
> +
> +	pr_info("RAPL PMU detected, hw unit 2^-%d Joules,"
> +		" API unit is 2^-32 Joules,"
> +		" %d fixed counters\n",
> +		pmu->hw_unit,
> +		hweight32(rapl_cntr_mask));
> +
> +	put_online_cpus();
> +
> +	return 0;
> +}
> +device_initcall(rapl_pmu_init);
> -- 
> 1.7.9.5
> 
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