Re: [PATCH 18/21] x86, numa: Synchronize nid info inmemblock.reserve with numa_meminfo.

From: Tejun Heo
Date: Thu Jul 25 2013 - 11:06:11 EST

Hello, Tang.

On Thu, Jul 25, 2013 at 12:09:29PM +0800, Tang Chen wrote:
> And as in [patch 14/21], when reserving hotpluggable memory, we use
> pxm. So my

Which is kinda nasty.

> idea was to do a nid sync in numa_init(). After this, memblock will
> set nid when
> it allocates memory.

Sure, that's the only place we can set the numa node IDs but my point
is that you don't need to add another interface. Jet let
memblock_set_node() handle both memblock.memory and .reserved ranges.
That way, you can make memblock simpler to use and less error-prone.

> If we want to let memblock_set_node() and alloc functions set nid on
> the reserved
> regions, we should setup nid <-> pxm mapping when we parst SRAT for
> the first time.

I don't follow why it has to be different. Why do you need to do
anything differently? What am I missing here?


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