Tell me about ZONE_DMA

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I'm trying to understand the differences between the three zones, ZONE_DMA,
ZONE_NORMAL,and ZONE_HIGHMEM. I've searched the source code (I'm getting pretty
good at understanding the kernel memory allocator), but I can't figure out what
physical regions of memory belong to each zone. Where is that determined?

Also, I get this eerie feeling that it's possible for a physical page to exist
in more than one zone. Is that true?

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