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

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Date:	Thu, 21 Mar 2013 11:40:33 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Russ Anderson <rja@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com
Subject: Re: [patch] mm: speedup in __early_pfn_to_nid

On Thu, 21 Mar 2013, Ingo Molnar wrote:

> > Index: linux/mm/page_alloc.c
> > ===================================================================
> > --- linux.orig/mm/page_alloc.c	2013-03-18 10:52:11.510988843 -0500
> > +++ linux/mm/page_alloc.c	2013-03-18 10:52:14.214931348 -0500
> > @@ -4161,10 +4161,19 @@ int __meminit __early_pfn_to_nid(unsigne
> >  {
> >  	unsigned long start_pfn, end_pfn;
> >  	int i, nid;
> > +	static unsigned long last_start_pfn, last_end_pfn;
> > +	static int last_nid;
> 
> Please move these globals out of function local scope, to make it more 
> apparent that they are not on-stack. I only noticed it in the second pass.
> 

The way they're currently defined places these in meminit.data as 
appropriate; if they are moved out, please make sure to annotate their 
definitions with __meminitdata.
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