Re: numa aware lmb and sparc stuff

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Mon, 2010-05-10 at 14:01 +0900, Paul Mundt wrote:
> On Mon, May 10, 2010 at 02:35:26PM +1000, Benjamin Herrenschmidt wrote:
> > So unless i'm missing something, I should be able to completely remove
> > lmb's reliance on that nid_range() callback and instead have lmb itself
> > use the various early_node_map[] accessors such as
> > for_each_active_range_index_in_nid() or similar.
> > 
> If you do this then you will also be coupling LMB with
> ARCH_POPULATES_NODE_MAP, which the nid_range() callback offers an
> alternative for (although since there aren't any architectures presently
> using LMB that don't also set ARCH_POPULATES_NODE_MAP perhaps this is
> ok). The nobootmem stuff also has a reliance on the early node map
> already.

Right, my tentative implementation indeed requires
ARCH_POPULATES_NODE_MAP for lmb_alloc_nid() to be available (I even
documented it). Do you see that as a limitation in the long run ?

> > If not, then I should be able to easily make that whole LMB numa thing
> > completely arch neutral.
> > 
> I've just started sorting out some of the LMB/NUMA bits on SH now as
> well, so I'd certainly be interested in any changes on top of Yinghai's
> work you're planning on doing.

I'm not sure I plan to change things on -top- of Yinghai work. I'm still
maintaining a patch series that is rooted before Yinghai current one, as
I very very much dislike pretty much everything in there. Though I plan
to provide all the functionality he needs for his x86 port and
NO_BOOTMEM implementation.

I'll post my WIP series later today after I got a chance to do some
tests.

Cheers,
Ben.


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