linux-kernel - Re: [PATCH 2/5] memory-hotplug: x86_32: suitable memory should go to ZONE

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Message-ID: <53C8EE4C.1000204@huawei.com>
Date:	Fri, 18 Jul 2014 17:52:12 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Ingo Molnar <mingo@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	"Mel Gorman" <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pei Feiyue <peifeiyue@...wei.com>, <linux-mm@...ck.org>,
	<x86@...nel.org>, <linux-ia64@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-sh@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] memory-hotplug: x86_32: suitable memory should go
 to ZONE_MOVABLE

On 2014/7/18 15:56, Wang Nan wrote:
> This patch add new memory to ZONE_MOVABLE if movable zone is setup
> and lower than newly added memory for x86_32.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
>  arch/x86/mm/init_32.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> index e395048..dd69833 100644
> --- a/arch/x86/mm/init_32.c
> +++ b/arch/x86/mm/init_32.c
> @@ -826,9 +826,15 @@ int arch_add_memory(int nid, u64 start, u64 size)
>  {
>  	struct pglist_data *pgdata = NODE_DATA(nid);
>  	struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM;
> +	struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;

Sorry. pgdat should be pgdata.

>  	unsigned long start_pfn = start >> PAGE_SHIFT;
>  	unsigned long nr_pages = size >> PAGE_SHIFT;
>  
> +	if (!zone_is_empty(movable_zone))
> +		if (zone_spans_pfn(movable_zone, start_pfn) ||
> +				(zone_end_pfn(movable_zone) <= start_pfn))
> +			zone = movable_zone;
> +
>  	return __add_pages(nid, zone, start_pfn, nr_pages);
>  }
>  
> 


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