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

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Message-ID: <20070323141633.GD20548@one.firstfloor.org>
Date:	Fri, 23 Mar 2007 15:16:33 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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: Re: [RFC] NUMA : could we introduce virt_to_nid() ?

On Fri, Mar 23, 2007 at 12:15:12PM +0100, Eric Dumazet wrote:
> 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() ?

Sure why not. Please send a patch.

-Andi
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