linux-kernel - Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation dynamic and remove NODEMAPSIZE

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Message-Id: <200611100748.30889.ak@suse.de>
Date:	Fri, 10 Nov 2006 07:48:30 +0100
From:	Andi Kleen <ak@...e.de>
To:	Amul Shah <amul.shah@...sys.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation dynamic and remove NODEMAPSIZE


> diff -uprN linux-2.6.19-rc4/arch/x86_64/kernel/e820.c linux-2.6.19-rc4-az/arch/x86_64/kernel/e820.c
> --- linux-2.6.19-rc4/arch/x86_64/kernel/e820.c	2006-10-31 17:38:41.000000000 -0500
> +++ linux-2.6.19-rc4-az/arch/x86_64/kernel/e820.c	2006-11-08 17:55:48.000000000 -0500
> @@ -83,6 +83,12 @@ static inline int bad_addr(unsigned long
>  		return 1;
>  	}
>  
> +	/* NUMA memory to node map */
> +	if (last >= nodemap_addr && addr < nodemap_addr + nodemap_size) {
> +		*addrp = nodemap_addr + nodemap_size;
> +		return 1;
> +	}

Using the e820 allocator will now mean it's rounded up to pages.
That will waste a bit of memory, but i suppose it's ok.

> +	for (i=20; !(bitfield&(1UL << i)) && i<BITS_PER_LONG; i++);

That's find_first_bit() ?  Please use that

>  
> +	shift = extract_lsb_from_nodes(nodes, numnodes);
> +	if ( allocate_cachealigned_memnodemap() )

No extra spaces here please (and in some other places)


> +	u8 *map;
> +	u8 zero;

zero?

>  } ____cacheline_aligned;
>  extern struct memnode memnode;
>  #define memnode_shift memnode.shift
>  #define memnodemap memnode.map
> +#define memnodemapsize memnode.mapsize

Have you checked how much the code .text size changes because
of the pointer reference? If it's a lot phys_to_nid might need to 
be out of lined.

-Andi
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