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

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Message-ID: <1361366462.10155.24.camel@laptop>
Date:	Wed, 20 Feb 2013 14:21:02 +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:
> +       for_each_possible_cpu(cpu) {
> +               sbm = &per_cpu(sbm_array, cpu);
> +               node = cpu_to_node(cpu);
> +               size = sizeof(struct sched_domain *) * sbm_max_level;
> +
> +               for (type = 0; type < SBM_MAX_TYPE; type++) {
> +                       sbm->sd[type] = kmalloc_node(size, GFP_KERNEL,
> node);
> +                       WARN_ON(!sbm->sd[type]);
> +                       if (!sbm->sd[type])
> +                               goto failed;
> +               }
> +       }

You can't readily use kmalloc_node() here, cpu_to_node() might return an
invalid node for offline cpus here.

Also see: 2ea45800d8e1c3c51c45a233d6bd6289a297a386

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