Regarding Memory models

Hi all,

While going through the Kernel memory management code, i came across the
few configuration options.
I would like to know more clearly about the following things.

1) What is FLAT MEMORY MODEL & SPARSE MEMORY MODEL & DISCONTIGEOUS memory?
Which cases you use each of them

2) What is Memory hot plugging?

and the relation between 1 & 2. Can u apply hotplugging feature to
Flat/Sparse?


-- 
With regards,
Sandeep Kumar Anantapalli,
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