linux-kernel - Re: [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore

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Date:	Mon, 26 Nov 2012 20:22:38 +0800
From:	wujianguo <wujianguo106@...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 5/5] page_alloc: Bootmem limit with movablecore_map

On 2012-11-23 18:44, Tang Chen wrote:
> This patch make sure bootmem will not allocate memory from areas that
> may be ZONE_MOVABLE. The map info is from movablecore_map boot option.
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> Reviewed-by: Wen Congyang <wency@...fujitsu.com>
> Tested-by: Lin Feng <linfeng@...fujitsu.com>
> ---
>  include/linux/memblock.h |    1 +
>  mm/memblock.c            |   15 ++++++++++++++-
>  2 files changed, 15 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index d452ee1..6e25597 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -42,6 +42,7 @@ struct memblock {
>  
>  extern struct memblock memblock;
>  extern int memblock_debug;
> +extern struct movablecore_map movablecore_map;
>  
>  #define memblock_dbg(fmt, ...) \
>  	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 6259055..33b3b4d 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -101,6 +101,7 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
>  {
>  	phys_addr_t this_start, this_end, cand;
>  	u64 i;
> +	int curr = movablecore_map.nr_map - 1;
>  
>  	/* pump up @end */
>  	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
> @@ -114,13 +115,25 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
>  		this_start = clamp(this_start, start, end);
>  		this_end = clamp(this_end, start, end);
>  
> -		if (this_end < size)
> +restart:
> +		if (this_end <= this_start || this_end < size)
>  			continue;
>  
> +		for (; curr >= 0; curr--) {
> +			if (movablecore_map.map[curr].start < this_end)

movablecore_map[curr].start should be movablecore_map[curr].start << PAGE_SHIFT.
May be you can change movablecore_map[].start/end to movablecore_map[].start_pfn/end_pfn
to avoid confusion.

> +				break;
> +		}
> +
>  		cand = round_down(this_end - size, align);
> +		if (curr >= 0 && cand < movablecore_map.map[curr].end) {
> +			this_end = movablecore_map.map[curr].start;

Ditto.

> +			goto restart;
> +		}
> +
>  		if (cand >= this_start)
>  			return cand;
>  	}
> +
>  	return 0;
>  }
>  
> 

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