linux-kernel - Re: Off topic: Numactl "distance" wrong

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Message-ID: <alpine.DEB.2.00.0904031448510.4329@chino.kir.corp.google.com>
Date:	Fri, 3 Apr 2009 14:52:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
cc:	Andi Kleen <andi@...stfloor.org>, Chris Worley <worleys@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Off topic: Numactl "distance" wrong

On Fri, 3 Apr 2009, Yinghai Lu wrote:

> acpi_numa_slit_init() in srat_64.c will have one copy (called
> acpi_slit) of SLIT, if there is SLIT from ACPI.
> 
> so if numa is enabled, could expose that acpi_slit via sysfs for the
> user to update it.
> 

Yeah, but in what format do you expect the user to update it?  There is no 
ACPI requirement that all nodes that have a remote distance of 20 to node 
0, for instance, are local to themselves.

So you'll have to report the entire physical topology in one write to a 
sysfs interface.  We don't currently have such a format unless we are to 
allow updating of the pxms.
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