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

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Message-Id: <200611101046.49806.dada1@cosmosbay.com>
Date:	Fri, 10 Nov 2006 10:46:49 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Amul Shah <amul.shah@...sys.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: Make the NUMA hash function nodemap allocation dynamic and remove NODEMAPSIZE

On Friday 10 November 2006 10:43, Eric Dumazet wrote:
>
> Therefore I suggest to use a structure like that :
>
> struct memnode {
>  	int shift;
> 	unsigned int mapsize; /* no need to use 8 bytes here */
> 	u8 *map;
> 	u8 embedded_map[64-8]; /* total size = 64 bytes */
>  } ____cacheline_aligned;
>

Arg... [64 - 16] sorry


> and make memnode.map point to memnode.embedded_map if mapsize <= 56 ?

mapsize <= 48

>
> This way, most AMD64 dual/quad processors wont waste a full PAGE to store
> few bytes in it, and should use only one cache line.
>
> Thank you
>
> Eric
>
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