linux-kernel - Re: [RFC PATCH v3 1/3] sched: schedule balance map foundation

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Message-ID: <1361366720.10155.25.camel@laptop>
Date:	Wed, 20 Feb 2013 14:25:20 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>, alex.shi@...el.com,
	Ram Pai <linuxram@...ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [RFC PATCH v3 1/3] sched: schedule balance map foundation

On Tue, 2013-01-29 at 17:09 +0800, Michael Wang wrote:
> +struct sched_balance_map {
> +       struct sched_domain **sd[SBM_MAX_TYPE];
> +       int top_level[SBM_MAX_TYPE];
> +       struct sched_domain *affine_map[NR_CPUS];
> +};

Argh.. affine_map is O(n^2) in nr_cpus, that's not cool.

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