linux-kernel - Re: [PATCH v2 1/5] x86: get pg_data

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Date:	Sun, 02 Dec 2012 23:11:08 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	hpa@...or.com, akpm@...ux-foundation.org, rob@...dley.net,
	isimatu.yasuaki@...fujitsu.com, laijs@...fujitsu.com,
	wency@...fujitsu.com, linfeng@...fujitsu.com, jiang.liu@...wei.com,
	yinghai@...nel.org, kosaki.motohiro@...fujitsu.com,
	minchan.kim@...il.com, mgorman@...e.de, rientjes@...gle.com,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 1/5] x86: get pg_data_t's memory from other node

On 11/23/2012 06:44 PM, Tang Chen wrote:
> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> 
> If system can create movable node which all memory of the
> node is allocated as ZONE_MOVABLE, setup_node_data() cannot
> allocate memory for the node's pg_data_t.
> So when memblock_alloc_nid() fails, setup_node_data() retries
> memblock_alloc().
> 
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>  arch/x86/mm/numa.c |   11 ++++++++---
>  1 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 2d125be..734bbd2 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -224,9 +224,14 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
>  	} else {
>  		nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
>  		if (!nd_pa) {
> -			pr_err("Cannot find %zu bytes in node %d\n",
> -			       nd_size, nid);
> -			return;
> +			pr_warn("Cannot find %zu bytes in node %d\n",
> +				nd_size, nid);
> +			nd_pa = memblock_alloc(nd_size, SMP_CACHE_BYTES);
> +			if (!nd_pa) {
> +				pr_err("Cannot find %zu bytes in other node\n",
> +				       nd_size);
> +				return;
> +			}
Hi Tang,
	Seems memblock_alloc_try_nid() serves the same purpose, so you may just
simply replace memblock_alloc_nid() with memblock_alloc_try_nid().

Regards!
Gerry

>  		}
>  		nd = __va(nd_pa);
>  	}
> 

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