linux-kernel - [RFC] NUMA : could we introduce virt_to

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Message-Id: <20070323121512.c287ddef.dada1@cosmosbay.com>
Date:	Fri, 23 Mar 2007 12:15:12 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <christoph@...eter.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: [RFC] NUMA : could we introduce virt_to_nid() ?

Hi Andi

Checking Christoph quicklist implementation, I found the same cache miss in free() than SLAB has.

/* common implementation *
int virt_to_nid(const void *addr)
{
	struct page *page = virt_to_page(addr); 
	return page_to_nid(page);
}

On some platforms (x86_64 for example), could we have a better implementation, not accessing struct page, but using phys_to_nid() ?

Thank you
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