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

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Date:	Mon, 25 Mar 2013 14:34:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Russ Anderson <rja@....com>, Ingo Molnar <mingo@...nel.org>,
	"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

On Sun, 24 Mar 2013 17:28:12 -0700 (PDT) David Rientjes <rientjes@...gle.com> wrote:

> On Sat, 23 Mar 2013, KOSAKI Motohiro wrote:
> 
> > > --- 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.
> > 
> 
> Um, defining them in a __meminit function places them in .meminit.data 
> already.

I wish it did, but it doesn't.
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