Re: [PATCH v3] mm: make expand_downwards symmetrical toexpand_upwards

[Christoph Lameter]

On Thu, 21 Apr 2011, David Rientjes wrote:

> I think we may want to just convert slub (and the memory controller) to
> use N_HIGH_MEMORY rather than N_NORMAL_MEMORY since nothing else uses it
> and the generic code seems to handle N_HIGH_MEMORY for all configs
> appropriately.

In 32 bit configurations some architectures (like x86) provide nodes
that have only high memory. Slab allocators only handle normal memory.
SLAB operates in a kind of degraded mode in that case by falling back for
each allocation to the nodes that have normal memory.

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