linux-kernel - Re: [tip:sched/core] sched/numa: Rewrite the CONFIG

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Date:	Wed, 6 Jun 2012 15:43:29 +0800
From:	Alex Shi <lkml.alex@...il.com>
To:	mingo@...nel.org, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, cmetcalf@...era.com,
	tony.luck@...el.com, sivanich@....com, akpm@...ux-foundation.org,
	ralf@...ux-mips.org, greg.pearson@...com, ink@...assic.park.msu.ru,
	tglx@...utronix.de, rth@...ddle.net,
	kamezawa.hiroyu@...fujitsu.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, anton@...ba.org,
	lethal@...ux-sh.org, davem@...emloft.net, benh@...nel.crashing.org,
	dhowells@...hat.com, mattst88@...il.com, fenghua.yu@...el.com,
	Alex Shi <alex.shi@...el.com>
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/numa: Rewrite the CONFIG_NUMA sched domain support

> +       /*
> +        * O(nr_nodes^2) deduplicating selection sort -- in order to find the
> +        * unique distances in the node_distance() table.
> +        *
> +        * Assumes node_distance(0,j) includes all distances in
> +        * node_distance(i,j) in order to avoid cubic time.

Curious for other platforms node_distance number, actually, this
assumption is right for what I saw Intel platforms. but it is not
match acpispec50.pdf:

Table 6-152 Example Relative Distances Between Proximity Domains
Proximity Domain 0 1 2 3
0 10 15 20 18
1 15 10 16 24
2 20 16 10 12
3 18 24 12 10


Alex
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