Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging

[H. Peter Anvin]

On 12/17/2014 01:47 PM, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@xxxxxxxxx>
> 
> X86 32-bit machine and kernel use PAE paging, which currently wastes about
> 4K of memory per process on Linux where we have to reserve an entire page to
> support a single 256-byte PGD structure.  It would be a very good thing if
> we could eliminate that wastage.
> 

4*8 = 32 bytes, where did 256 bytes come from?

	-hpa


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