linux-kernel - Re: [PATCH 1/3] x86: provide CPU topology information for multi-node processors

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Date:	Tue, 2 Jun 2009 18:19:44 +0200
From:	Bert Wesarg <bert.wesarg@...glemail.com>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86: provide CPU topology information for multi-node 
	processors

On Tue, Jun 2, 2009 at 17:58, Andreas Herrmann
<andreas.herrmann3@....com> wrote:
> On Tue, Jun 02, 2009 at 05:05:07PM +0200, Bert Wesarg wrote:
>> On Fri, May 29, 2009 at 20:42, Andreas Herrmann
>> <andreas.herrmann3@....com> wrote:
>> > This support can be switched off/on using a new config option
>> > MULTI_NODE_CPU. If the option is set the CPU topology information is
>> > extended with cpu_node information. This includes a cpu_node_id,
>> > cpu_node_siblings and cpu_node_siblings_list.
>
>> I think this would be a step back after commit
>> c50cbb05a05cf1f9ca3592272eff053c847727d8. Which exported default
>> topology information, in case the architecture does not provide these
>> information.
>
> I am fine with exporting default topology information for all
> architectures.
>
> I just wanted to avoid pollution of sysfs with useless information
> when this information is not provided on an architecture.
>
> Further thoughts -- e.g. concerning the MULTI_NODE_CPU config option?
>
> If I provide defaults for cpu_node_id, cpu_node_siblings etc. the
> config option becomes rather useless and I'll remove it.
Exactly ;-)

The interface to the exported API should not depend on config options.
Only the kernel version number should indicate, whether the cpu_node
information is available or not.

Thanks,
Bert
>
>
> Regards,
> Andreas
>
>
>
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