linux-kernel - Re: [PATCH v5 2/6] hwmon: (fam15h_power) Add compute unit accumulated power

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Message-ID: <20160329073158.GC3408@twins.programming.kicks-ass.net>
Date:	Tue, 29 Mar 2016 09:31:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Huang Rui <ray.huang@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <jdelvare@...e.de>, linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org, spg_linux_kernel@....com
Subject: Re: [PATCH v5 2/6] hwmon: (fam15h_power) Add compute unit
 accumulated power

On Mon, Mar 28, 2016 at 11:29:52AM +0200, Borislav Petkov wrote:
> I think you want something like this: iterate over each core and put one
> of them into the mask.
> 
> 	core = -1;
> 
> 	for_each_online_cpu(cpu) {
> 		this_core = topology_core_id(cpu);
> 
> 		if (this_core == core)
> 			continue;
> 
> 		core = this_core;
> 
> 		/* get any CPU on this compute unit */
> 		cpumask_set_cpu(cpumask_any(topology_sibling_cpumask(cpu)), mask);
> 	}

This will not in fact work for Intel, nor if I manage to one day
randomize our CPU numbers on AMD.