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

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Date:	Fri, 23 Mar 2007 14:48:24 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Eric Dumazet" <dada1@...mosbay.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"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 3/23/07, Eric Dumazet <dada1@...mosbay.com> wrote:
> 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() ?

Sounds good to me. At least cache_free_alien() in mm/slab.c to should
be converted to use it.
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