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

[Xishi Qiu]

On 2015/12/10 5:59, Luck, Tony wrote:

>> 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.

Thanks,
Xishi Qiu

> -Tony
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