linux-kernel - Re: [PATCH RFC 1/5] sched,numa: build table of node hop distance

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Message-ID: <20141012131714.GE3015@worktop>
Date:	Sun, 12 Oct 2014 15:17:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, mgorman@...e.de, chegu_vinod@...com,
	mingo@...nel.org, efault@....de, vincent.guittot@...aro.org
Subject: Re: [PATCH RFC 1/5] sched,numa: build table of node hop distance

On Wed, Oct 08, 2014 at 03:37:26PM -0400, riel@...hat.com wrote:
> +	sched_domains_numa_hops = kzalloc(sizeof(int) * nr_node_ids * nr_node_ids, GFP_KERNEL);
> +	if (!sched_domains_numa_hops)
> +		return;

That's potentially a _BIG_ table (1M for a 512 node system).
The node_distance has magic allocations and is of u8 size, is there any
way we can re-use node_distance and avoid a second O(n^2) allocation?
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