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

[Izumi, Taku]

Dear Tony, Xishi,

> >> 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?
> >
> 
> As I know, the kernel pages will not allocated from movable zone.

 Yes, kernel pages are not allocated from ZONE_MOVABLE.

 In this case administrator must review and reconfigure the mirror ratio via 
 "MirrorRequest" EFI variable.
 
  Sincerely,
  Taku Izumi

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