linux-kernel - Re: [PATCH] [3/4] SLAB: Set up the l3 lists for the memory of freshly added memory v2

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Date:	Thu, 11 Feb 2010 13:45:16 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	penberg@...helsinki.fi, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, haicheng.li@...el.com
Subject: Re: [PATCH] [3/4] SLAB: Set up the l3 lists for the memory of freshly
 added memory v2

On Thu, 11 Feb 2010, Andi Kleen wrote:

> Index: linux-2.6.32-memhotadd/mm/slab.c
> ===================================================================
> --- linux-2.6.32-memhotadd.orig/mm/slab.c
> +++ linux-2.6.32-memhotadd/mm/slab.c
> @@ -115,6 +115,7 @@
>  #include	<linux/reciprocal_div.h>
>  #include	<linux/debugobjects.h>
>  #include	<linux/kmemcheck.h>
> +#include	<linux/memory.h>
>  
>  #include	<asm/cacheflush.h>
>  #include	<asm/tlbflush.h>
> @@ -1554,6 +1555,23 @@ void __init kmem_cache_init(void)
>  	g_cpucache_up = EARLY;
>  }
>  
> +static int slab_memory_callback(struct notifier_block *self,
> +				unsigned long action, void *arg)
> +{
> +	struct memory_notify *mn = (struct memory_notify *)arg;
> +
> +	/*
> +	 * When a node goes online allocate l3s early.	 This way
> +	 * kmalloc_node() works for it.
> +	 */
> +	if (action == MEM_ONLINE && mn->status_change_nid >= 0) {
> +		mutex_lock(&cache_chain_mutex);
> +		slab_node_prepare(mn->status_change_nid);
> +		mutex_unlock(&cache_chain_mutex);
> +	}
> +	return NOTIFY_OK;
> +}
> +
>  void __init kmem_cache_init_late(void)
>  {
>  	struct kmem_cache *cachep;
> @@ -1577,6 +1595,8 @@ void __init kmem_cache_init_late(void)
>  	 */
>  	register_cpu_notifier(&cpucache_notifier);
>  
> +	hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
> +

Only needed for CONFIG_NUMA, but there's no side-effects for UMA kernels 
since status_change_nid will always be -1.

Acked-by: David Rientjes <rientjes@...gle.com>
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