linux-kernel - Re: [patch] mm: speedup in __early_pfn_to

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Date:	Sat, 23 Mar 2013 18:24:04 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Russ Anderson <rja@....com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch] mm: speedup in __early_pfn_to_nid

> --- 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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