linux-kernel - Re: 2.6.24-rc3-mm2 (bugfix for memory cgroup per-zone-struct allocation.)

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Date:	Thu, 29 Nov 2007 16:25:33 -0500
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc3-mm2 (bugfix for memory cgroup per-zone-struct
	allocation.)

On Thu, 2007-11-29 at 14:24 +0900, KAMEZAWA Hiroyuki wrote:
> On Thu, 29 Nov 2007 12:23:29 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > I noticed CONFIG_NUMA + CONFIG_CGROUP_MEM_CONT + CONFIG_SLUB cannot boot because of my patch.
> > (SLAB is ok.)
> > I'll post workaround soon.
> > 
> ==
> This is a fix. tested on my ia64/NUMA box both on SLAB/SLUB.
> This patch fixes kmalloc_node() is called against node-without-memory.
> 
> It's better to add memory hotplug callback for supporing possible nodes
> (memory hotplug) but here just uses kmalloc().
> 
> Should be revisited later.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
>  mm/memcontrol.c |   14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.24-rc3-mm2/mm/memcontrol.c
> ===================================================================
> --- linux-2.6.24-rc3-mm2.orig/mm/memcontrol.c
> +++ linux-2.6.24-rc3-mm2/mm/memcontrol.c
> @@ -1117,8 +1117,18 @@ static int alloc_mem_cgroup_per_zone_inf
>  	struct mem_cgroup_per_node *pn;
>  	struct mem_cgroup_per_zone *mz;
>  	int zone;
> -
> -	pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
> +	/*
> +	 * This routine is called against possible nodes.
> +	 * But it's BUG to call kmalloc() against offline node.
> +	 *
> +	 * TODO: this routine can waste much memory for nodes which will
> +	 *       never be onlined. It's better to use memory hotplug callback
> +	 *       function.
> +	 */
> +	if (node_state(node, N_HIGH_MEMORY))
> +		pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
> +	else
> +		pn = kmalloc(sizeof(*pn), GFP_KERNEL);
>  	if (!pn)
>  		return 1;
>  
> 

This worked for me.  Can boot 24-rc3-mm2 [if I turn off async scsi scan,
that is--not related to mem controller].  

Just FYI, on my ia64 platform, with NODES_SHIFT == 8 [RHEL & SLES ship
with 10, I believe], the size of the mem_cgroup structure is ~10KB.

Lee

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