RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option

[Luck, Tony]

> How about add some comment, if mirrored memroy is too small, then the
> normal zone is small, so it may be oom.
> The mirrored memory is at least 1/64 of whole memory, because struct
> pages usually take 64 bytes per page.

1/64th is the absolute lower bound (for the page structures as you say). I
expect people will need to configure 10% or more to run any real workloads.

I made the memblock boot time allocator fall back to non-mirrored memory
if mirrored memory ran out.  What happens in the run time allocator if the
non-movable zones run out of pages? Will we allocate kernel pages from movable
memory?

-Tony
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