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

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Message-ID: <86802c440904031448yc6d499ckd9cb969ce136f477@mail.gmail.com>
Date:	Fri, 3 Apr 2009 14:48:31 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	David Rientjes <rientjes@...gle.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, Apr 3, 2009 at 2:43 PM, David Rientjes <rientjes@...gle.com> wrote:
>
> Yinghai, can you elaborate on exactly what type of interface you can
> imagine for modifying the distance for nodes through sysfs?  It seems like
> you'd have to report the entire physical topology in one write, for which
> we currently don't have an interface for beyond pxms, instead of per-node
> distances to remote nodes.

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.

YH
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