Re: [PATCH part5 0/7] Arrange hotpluggable memory as ZONE_MOVABLE.

From: Tejun Heo
Date: Tue Aug 13 2013 - 10:39:16 EST

Hello, Tang.

On Tue, Aug 13, 2013 at 05:56:46PM +0800, Tang Chen wrote:
> 1. Introduce a memblock.current_limit_low to limit the lowest address
> that memblock can use.
> 2. Make memblock be able to allocate memory from low to high.
> 3. Get kernel image address on x86, and set memblock.current_limit_low
> to it before SRAT is parsed. Then we achieve the goal.
> 4. Reset it to 0, and make memblock allocate memory form high to low.
> How do you think of this, or do you have any better idea ?

Yes, something like that. Maybe have something like
memblock_set_alloc_range(low, high, low_to_high) in memblock? Once
NUMA info is available arch code can call memblock_set_alloc_range(0,
0, false) to reset it to the default behavior.

> Thanks for your patient and help. :)

Heh, sorry about all the roundabouts. Your persistence is much
appreciated. :)

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