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From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Date: Sat, 23 Mar 2013 18:24:04 -0400
Message-ID: <CAHGf_=qgsga4Juj8uNnfbmOZYtYhcQbqngbFDWg9=B-1nc1HSw@mail.gmail.com>
Subject: Re: [patch] mm: speedup in __early_pfn_to_nid
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Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Russ Anderson <rja@sgi.com>
Cc: Ingo Molnar <mingo@kernel.org>, David Rientjes <rientjes@google.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>

> --- linux.orig/mm/page_alloc.c  2013-03-19 16:09:03.736450861 -0500
> +++ linux/mm/page_alloc.c       2013-03-22 17:07:43.895405617 -0500
> @@ -4161,10 +4161,23 @@ int __meminit __early_pfn_to_nid(unsigne
>  {
>         unsigned long start_pfn, end_pfn;
>         int i, nid;
> +       /*
> +          NOTE: The following SMP-unsafe globals are only used early
> +          in boot when the kernel is running single-threaded.
> +        */
> +       static unsigned long last_start_pfn, last_end_pfn;
> +       static int last_nid;

Why don't you mark them __meminitdata? They seems freeable.

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