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

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Message-ID: <20110616085547.GH4935@const.famille.thibault.fr>
Date:	Thu, 16 Jun 2011 10:55:47 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.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

Hello,

Vincent Guittot, le Thu 16 Jun 2011 10:49:13 +0200, a écrit :
> The affinity between Arm processors is defined in the MPIDR register.
> We can identify which processors are in the same cluster,
> and which ones have performance interdependency. The cpu topology
>  of an Arm platform can be set thanks to this register and this topology
> is then used by sched_mc and sched_smt.

Cool!  Could you check that the hwloc tool gets also gets this
information from userland through /sys, and/or send me the output of the
hwloc-gather-topology tool from hwloc so we can add an testcase for
this?

Samuel
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