linux-kernel - Re: [PATCH] Don't export sched_mc_power_savings on multi-socket single core system

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Date:	Wed, 8 Apr 2009 13:42:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	svaidy@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	dipankar@...ibm.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] Don't export sched_mc_power_savings on multi-socket
	single core system


* Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com> wrote:

> Fix to prevent sched_mc_power_saving from being exported through 
> sysfs for multi-scoket single core system. Max cores should be 
> always greater than one (1). My earlier patch that introduced fix 
> for not exporting 'sched_mc_power_saving' on laptops broke it on 
> multi-socket single core system. This fix addresses issue on both 
> laptop and multi-socket single core system. Below are the Test 
> results:

> +#define mc_capable()   (boot_cpu_data.x86_max_cores > 1) && \
> +                       (cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids)
> #define smt_capable()                  (smp_num_siblings > 1)

patch looks good but is whitespace damaged (all tabs were converted 
to spaces). See Documentation/email-clients.txt about how to set up 
your client.

	Ingo
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