linux-kernel - Re: [Bugme-new] [Bug 13690] New: nodes_clear cause hugepage unusable on non-NUMA machine

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Message-Id: <1246850004.18539.87.camel@alexs-hp.sh.intel.com>
Date:	Mon, 06 Jul 2009 11:13:24 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"bugzilla-daemon@...zilla.kernel.org" 
	<bugzilla-daemon@...zilla.kernel.org>,
	"bugme-daemon@...zilla.kernel.org" <bugme-daemon@...zilla.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [Bugme-new] [Bug 13690] New: nodes_clear cause hugepage
 unusable on non-NUMA machine

Yinghai:

The 31-rc2 kernel still can not use hugepage on non-NUMA machine. And
this patch did not appear on rc2 kernel. Are there some concern about
this? 

BRG
Alex 


On Thu, 2009-07-02 at 16:50 +0800, Yinghai Lu wrote:
> Alex Shi wrote:
> > The new patch works for my stoakley i386 machine. But for x86_64 machine
> > the specjbb2005 still can not run with hugepage. The specjbb2005 use the
> > same java setting as i386 system. After apply your patch, the iomem of
> > x86_64 is:
> 
> please check
> 
> [PATCH] x86: don't clear nodes_states[N_NORMAL_MEMORY] when numa is not compiled in
> 
> Alex found:
> for x86_64 machine the specjbb2005 still can not run with hugepage
> 
> only happens when numa is not compiled in
> 
> the root cause: node_set_state will not set it back for us in that case
> 
> so don't clear that when numa is not select in config
> 
> Reported-by: Alex Shi <alex.shi@...el.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/x86/mm/init_64.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/arch/x86/mm/init_64.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/mm/init_64.c
> +++ linux-2.6/arch/x86/mm/init_64.c
> @@ -598,8 +598,14 @@ void __init paging_init(void)
>  
>  	sparse_memory_present_with_active_regions(MAX_NUMNODES);
>  	sparse_init();
> -	/* clear the default setting with node 0 */
> +#if MAX_NUMNODES > 1
> +	/*
> +	 * clear the default setting with node 0
> +	 * note: don't clear it, node_set_state will do nothing
> +	 *	 (aka set it back) when numa support is not compiled in
> +	 */
>  	nodes_clear(node_states[N_NORMAL_MEMORY]);
> +#endif
>  	free_area_init_nodes(max_zone_pfns);
>  }
>  

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