sparcemem or discontig?

[C Michael Sundius <Michael.sundius@sciatl.com>]

Hi,

I'm working on a 32bit mips 1 cpu platform that has 2 large banks of
memory that are discontiguous in the physical address space. That is to
say there is a large hole in between them. We are using the 2.6.24
kernel. In order to save memory on page tables, we'd like to employ the
use of either the CONFIG_SPARCEMEM, or CONFIG_DISCONTIG configuration
options, but I'm a bit unsure which I should use.

My understanding is that SPARCEMEM is the way of the future, and since
I don't really have a NUMA machine, maybe sparcemem is more appropriate,
yes? On the other hand I can't find much info about how it works or how
to add support for it on an architecture that has here-to-fore not
supported that option.

Is there anywhere that there is a paper or rfp that describes how the
spacemem (or discontig) features work (and/or the differences between
then)? Has anyone out there done this for MIPS32? has anyone had
experience with adding support for either sparcemem or discontig on an
arch before , that could give me a their thoughts the process or "gotchas"?

thanks
Mike



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