linux-kernel - Re: [RFC PATCH v2] SLUB: enhance slub to handle memory nodes without normal memory

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Message-ID: <alpine.DEB.2.00.1207240931560.29808@router.home>
Date:	Tue, 24 Jul 2012 09:45:57 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Jiang Liu <jiang.liu@...wei.com>
cc:	WuJianguo <wujianguo@...wei.com>, Tony Luck <tony.luck@...el.com>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mgorman@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Keping Chen <chenkeping@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Jiang Liu <liuj97@...il.com>
Subject: Re: [RFC PATCH v2] SLUB: enhance slub to handle memory nodes without
 normal memory

On Tue, 24 Jul 2012, Jiang Liu wrote:

>
> diff --git a/mm/slub.c b/mm/slub.c
> index 8c691fa..3976745 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2803,6 +2803,17 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
>
>  static struct kmem_cache *kmem_cache_node;
>
> +static bool node_has_normal_memory(int node)
> +{
> +	int i;
> +
> +	for (i = ZONE_NORMAL; i >= 0; i--)
> +		if (populated_zone(&NODE_DATA(node)->node_zones[i]))
> +			return true;
> +
> +	return false;
> +}

There is already a N_NORMAL_MEMORY node map that contains a list of node
that have *normal* memory usable by slab allocators etc. I think the
cleanest solution would be to clear the corresponding node bits for your
special movable only zones. Then you wont be needing to modify other
subsystems anymore.

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