linux-kernel - Re: [PATCH] slab: initialize unused alien cache entry as NULL at alloc_alien

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Message-ID: <alpine.DEB.2.00.0912220945250.12048@router.home>
Date:	Tue, 22 Dec 2009 09:47:39 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Haicheng Li <haicheng.li@...ux.intel.com>
cc:	linux-mm@...ck.org, Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slab: initialize unused alien cache entry as NULL at
 alloc_alien_cache().

On Tue, 22 Dec 2009, Haicheng Li wrote:

>  	struct array_cache **ac_ptr;
> -	int memsize = sizeof(void *) * nr_node_ids;
> +	int memsize = sizeof(void *) * MAX_NUMNODES;
>  	int i;

Why does the alien cache pointer array size have to be increased? node ids
beyond nr_node_ids cannot be used.


>
>  	if (limit > 1)
>  		limit = 12;
>  	ac_ptr = kmalloc_node(memsize, gfp, node);

Use kzalloc to ensure zeroed memory.

>  	if (ac_ptr) {
> +		memset(ac_ptr, 0, memsize);
>  		for_each_node(i) {
> -			if (i == node || !node_online(i)) {
> -				ac_ptr[i] = NULL;
> +			if (i == node || !node_online(i))
>  				continue;
> -			}
>  			ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d,
> gfp);
>  			if (!ac_ptr[i]) {
>  				for (i--; i >= 0; i--)
>
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