linux-kernel - Re: early_node_mem()'s memory allocation policy

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Date:	Wed, 27 Oct 2010 13:21:03 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: early_node_mem()'s memory allocation policy

 On 10/26/2010 10:49 PM, Yinghai Lu wrote:
> please check
>
> [PATCH] x86, memblock: Fix early_node_mem with big reserved region.
>
> Jeremy said Xen could reserve huge mem but still show as ram in e820.
>
> early_node_mem could not find range because of start/end adjusting.
>
> Let's use memblock_find_in_range instead ***_node. So get real top down in fallback path.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>

Yes, that works.  Could you queue it for upstream?  Without this we see
Xen crashes with certain memory configurations.

Thanks,
    J

> diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
> index 60f4985..7ffc9b7 100644
> --- a/arch/x86/mm/numa_64.c
> +++ b/arch/x86/mm/numa_64.c
> @@ -178,11 +178,8 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
>  
>  	/* extend the search scope */
>  	end = max_pfn_mapped << PAGE_SHIFT;
> -	if (end > (MAX_DMA32_PFN<<PAGE_SHIFT))
> -		start = MAX_DMA32_PFN<<PAGE_SHIFT;
> -	else
> -		start = MAX_DMA_PFN<<PAGE_SHIFT;
> -	mem = memblock_x86_find_in_range_node(nodeid, start, end, size, align);
> +	start = MAX_DMA_PFN << PAGE_SHIFT;
> +	mem = memblock_find_in_range(start, end, size, align);
>  	if (mem != MEMBLOCK_ERROR)
>  		return __va(mem);
>  
>

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