linux-kernel - Re: [RFC] Add Arm cpu topology definition

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Message-ID: <20110616132441.GJ14846@anthem.async.com.br>
Date:	Thu, 16 Jun 2011 10:24:41 -0300
From:	Christian Robottom Reis <kiko@...aro.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org
Subject: Re: [RFC] Add Arm cpu topology definition

On Thu, Jun 16, 2011 at 10:49:13AM +0200, Vincent Guittot wrote:
> @@ -219,6 +219,24 @@ source "kernel/Kconfig.freezer"
> 
>  menu "System Type"
> 
> +config SCHED_MC
> +	bool "Multi-core scheduler support"
> +	depends on SMP && ARM_CPU_TOPOLOGY
> +	default n
> +	help
> +	  Multi-core scheduler support improves the CPU scheduler's decision
> +	  making when dealing with multi-core CPU chips at a cost of slightly
> +	  increased overhead in some places. If unsure say N here.
> +
> +config SCHED_SMT
> +	bool "SMT scheduler support"
> +	depends on SMP && ARM_CPU_TOPOLOGY
> +	default n
> +	help
> +	  Improves the CPU scheduler's decision making when dealing with
> +	  MultiThreading at a cost of slightly increased overhead in some
> +	  places. If unsure say N here.
> +

Quick question: the patch doesn't actually seem to use the SCHED_MC and
SCHED_SMT config bits; is that actually correct?
-- 
Christian Robottom Reis   | [+55] 16 9112 6430 | http://launchpad.net/~kiko
Linaro Engineering VP     | [ +1] 612 216 4935 | http://async.com.br/~kiko
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