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Date:	Wed, 26 Dec 2012 15:53:09 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	<jiang.liu@...wei.com>, <wujianguo@...wei.com>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <wency@...fujitsu.com>,
	<laijs@...fujitsu.com>, <linfeng@...fujitsu.com>,
	<yinghai@...nel.org>, <rob@...dley.net>,
	<kosaki.motohiro@...fujitsu.com>, <minchan.kim@...il.com>,
	<mgorman@...e.de>, <rientjes@...gle.com>,
	<guz.fnst@...fujitsu.com>, <rusty@...tcorp.com.au>,
	<lliubbo@...il.com>, <jaegeuk.hanse@...il.com>,
	<tony.luck@...el.com>, <glommer@...allels.com>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v4 3/6] ACPI: Restructure movablecore_map with memory
 info from SRAT.

Hi Tang,

I don't think it can work well.
The patch gets memory range of hotpluggable memory by
acpi_numa_memory_affinity_init(). But it too late.
For example, if we use log_buf_len boot options, memblock allocator
runs before getting SRAT information. In this case, this movablecore_map
boot option does not work well.

Thanks,
Yasuaki Ishimatsu

2012/12/19 18:11, Tang Chen wrote:
> The Hot Plugable bit in SRAT flags specifys if the memory range
> could be hotplugged.
> 
> If user specified movablecore_map=nn[KMG]@ss[KMG], reset
> movablecore_map.map to the intersection of hotpluggable ranges from
> SRAT and old movablecore_map.map.
> Else if user specified movablecore_map=acpi, just use the hotpluggable
> ranges from SRAT.
> Otherwise, do nothing. The kernel will use all the memory in all nodes
> evenly.
> 
> The idea "getting info from SRAT" was from Liu Jiang <jiang.liu@...wei.com>.
> And the idea "do more limit for memblock" was from Wu Jianguo <wujianguo@...wei.com>
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Tested-by: Gu Zheng <guz.fnst@...fujitsu.com>
> ---
>   arch/x86/mm/srat.c |   55 +++++++++++++++++++++++++++++++++++++++++++++++++--
>   1 files changed, 52 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
> index 4ddf497..a8856d2 100644
> --- a/arch/x86/mm/srat.c
> +++ b/arch/x86/mm/srat.c
> @@ -146,7 +146,12 @@ int __init
>   acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>   {
>   	u64 start, end;
> +	u32 hotpluggable;
>   	int node, pxm;
> +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> +	int overlap;
> +	unsigned long start_pfn, end_pfn;
> +#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>   
>   	if (srat_disabled())
>   		return -1;
> @@ -157,8 +162,10 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>   	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
>   		return -1;
>   
> -	if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
> +	hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
> +	if (hotpluggable && !save_add_info())
>   		return -1;
> +
>   	start = ma->base_address;
>   	end = start + ma->length;
>   	pxm = ma->proximity_domain;
> @@ -178,9 +185,51 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>   
>   	node_set(node, numa_nodes_parsed);
>   
> -	printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
> +	printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx] %s\n",
>   	       node, pxm,
> -	       (unsigned long long) start, (unsigned long long) end - 1);
> +	       (unsigned long long) start, (unsigned long long) end - 1,
> +	       hotpluggable ? "Hot Pluggable": "");
> +
> +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> +	start_pfn = PFN_DOWN(start);
> +	end_pfn = PFN_UP(end);
> +
> +	if (!hotpluggable) {
> +		/* Clear the range overlapped in movablecore_map.map */
> +		remove_movablecore_map(start_pfn, end_pfn);
> +		goto out;
> +	}
> +
> +	if (!movablecore_map.acpi) {
> +		for (overlap = 0; overlap < movablecore_map.nr_map; overlap++) {
> +			if (start_pfn < movablecore_map.map[overlap].end_pfn)
> +				break;
> +		}
> +
> +		/*
> +		 * If there is no overlapped range, or the end of the overlapped
> +		 * range is higher than end_pfn, then insert nothing.
> +		 */
> +		if (end_pfn <= movablecore_map.map[overlap].end_pfn)
> +			goto out;
> +
> +		/*
> +		 * Otherwise, insert the rest of this range to prevent memblock
> +		 * from allocating memory in it.
> +		 */
> +		start_pfn = movablecore_map.map[overlap].end_pfn;
> +		start = start_pfn >> PAGE_SHIFT;
> +	}
> +
> +	/* If user chose to use SRAT info, insert the range anyway. */
> +	if (insert_movablecore_map(start_pfn, end_pfn))
> +		pr_err("movablecore_map: too many entries;"
> +			" ignoring [mem %#010llx-%#010llx]\n",
> +			(unsigned long long) start,
> +			(unsigned long long) (end - 1));
> +
> +out:
> +#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>   	return 0;
>   }
>   
> 


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