linux-kernel - Re: [PATCH -v2] mm: SLAB Out-of-memory diagnostics

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Date:	Tue, 6 Mar 2012 19:41:55 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Rafael Aquini <aquini@...hat.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Rik van Riel <riel@...hat.com>,
	Josef Bacik <josef@...hat.com>
Subject: Re: [PATCH -v2] mm: SLAB Out-of-memory diagnostics

On Mon, 5 Mar 2012, Rafael Aquini wrote:

> diff --git a/mm/slab.c b/mm/slab.c
> index f0bd785..4aeb5e7 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -1731,6 +1731,52 @@ static int __init cpucache_init(void)
>  }
>  __initcall(cpucache_init);
>  
> +static noinline void
> +slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
> +{
> +	struct kmem_list3 *l3;
> +	struct slab *slabp;
> +	unsigned long flags;
> +	int node;
> +
> +	printk(KERN_WARNING
> +		"SLAB: Unable to allocate memory on node %d (gfp=0x%x)\n",
> +		nodeid, gfpflags);
> +	printk(KERN_WARNING "   cache: %s, object size: %d, order: %d\n",
> +		cachep->name, cachep->buffer_size, cachep->gfporder);
> +
> +	for_each_online_node(node) {
> +		unsigned long active_objs = 0, num_objs = 0, free_objects = 0;
> +		unsigned long active_slabs = 0, num_slabs = 0;
> +
> +		l3 = cachep->nodelists[node];
> +		if (!l3)
> +			continue;
> +
> +		spin_lock_irqsave(&l3->list_lock, flags);

Could be spin_lock_irq(&l3->list_lock);
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