linux-kernel - Re: [PATCH 5/9] perf/x86/intel: Add Intel Cache QoS Monitoring support

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Message-ID: <20150125183455.GA15208@krava.brq.redhat.com>
Date:	Sun, 25 Jan 2015 19:34:55 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Kanaka Juvva <kanaka.d.juvva@...el.com>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 5/9] perf/x86/intel: Add Intel Cache QoS Monitoring
 support

On Fri, Jan 23, 2015 at 06:45:44PM +0000, Matt Fleming wrote:

SNIP

> +	int phys_id = topology_physical_package_id(cpu);
> +	int i;
> +
> +	for_each_cpu(i, &cqm_cpumask) {
> +		if (phys_id == topology_physical_package_id(i))
> +			return;	/* already got reader for this socket */
> +	}
> +
> +	cpumask_set_cpu(cpu, &cqm_cpumask);
> +}
> +
> +static void intel_cqm_cpu_prepare(unsigned int cpu)
> +{
> +	struct intel_cqm_state *state = &per_cpu(cqm_state, cpu);
> +	struct cpuinfo_x86 *c = &cpu_data(cpu);
> +
> +	raw_spin_lock_init(&state->lock);
> +	state->rmid = 0;

shouldn't you also init state->cnt?

jirka
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