linux-kernel - Re: [RFC, PATCH] SLAB : [NUMA] keep nodeid in struct page instead of struct slab

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Message-ID: <20070321160846.GA25583@one.firstfloor.org>
Date:	Wed, 21 Mar 2007 17:08:46 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <christoph@...eter.com>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC, PATCH] SLAB : [NUMA] keep nodeid in struct page instead of struct slab

On Wed, Mar 21, 2007 at 10:22:31AM +0100, Eric Dumazet wrote:
> In order to avoid a cache miss in kmem_cache_free() on NUMA and reduce hot path length, we could exploit the following common facts.
> 
> 1) MAX_NUMNODES <= 64
> 
> 2) alignment of 'struct kmem_cache *' can be >= 64
> 
> The following patch changes the page->lru.next to contain not only the 'struct kmem_cache *' pointer, but also the nodeid in the low order bits.
> 

It might be cleaner to just put it into flags on 64bit. There is enough
space there and we don't really care about 32bit NUMA machines.

-Andi
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