linux-kernel - Re: [Patch / 002](memory hotplug) Callback function to create kmem_cache

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Message-ID: <Pine.LNX.4.64.0710011334090.19779@schroedinger.engr.sgi.com>
Date:	Mon, 1 Oct 2007 13:34:58 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
cc:	Andrew Morton <akpm@...l.org>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [Patch / 002](memory hotplug) Callback function to create
 kmem_cache_node.

On Mon, 1 Oct 2007, Yasunori Goto wrote:

> +#ifdef CONFIG_MEMORY_HOTPLUG
> +static void __slab_callback_offline(int nid)
> +{
> +	struct kmem_cache_node *n;
> +	struct kmem_cache *s;
> +
> +	list_for_each_entry(s, &slab_caches, list) {
> +		if (s->node[nid]) {
> +			n = get_node(s, nid);
> +			s->node[nid] = NULL;
> +			kmem_cache_free(kmalloc_caches, n);
> +		}
> +	}
> +}

I think we need to bug here if there are still objects on the node that 
are in use. This will silently discard the objects.

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