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SubjectRe: [patch] mm: speedup in __early_pfn_to_nid
On Sun, 24 Mar 2013 17:28:12 -0700 (PDT) David Rientjes <rientjes@google.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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