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

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Date:	Fri, 30 Nov 2007 09:14:24 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...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, 29 Nov 2007 16:25:33 -0500
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> > -	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].  
> 
Thank you !

> 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.
> 
Yes. But...
I'll ask Goto-san how memory hotplug callback works and try it.

Thanks,
-Kame


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