Re: [PATCH] [8/13] Enable the mask allocator for x86
From: Christoph Lameter
Date: Mon Mar 10 2008 - 13:14:48 EST
On Sat, 8 Mar 2008, Andi Kleen wrote:
> What sparsemem reference do you mean?
Its just the use of MAX_DMA_ADDRESS in mm/sparse-vmemmap.c
> But the ZONE_DMA32 actually makes sense, but changing the semantics
> under such a large driver base isn't a good idea.
The driver base can only be the x86_64 only device drivers since the zone
is not used by any other architectures. That is fairly small AFAICT.
> It depends on the requirements of the bootmem user. Some do need
> memory <4GB, some do not. The mask allocator itself is a client in fact
> and it requires low memory of course.
The point is that it would be good to relocate as much memory allocated at
boot as possible beyond 4GB.
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