Re: [RFC 2/2] x86_64, mm: Reinsert the absent memory

[H. Peter Anvin]

On 06/24/2013 12:39 PM, Ingo Molnar wrote:
> 
> That might be a bit too granular: if we hit such an uninitialized block of 
> memory we'd have to process 262,144 pages - potentially from an IRQ 
> handler that does GFP_ATOMIC... or other latency critical code.
> 
> With 2MB we'd have to on-demand initialize 512 pages, which shouldn't show 
> up during normal use.
> 

No... you split the gigabyte page into 511 2M pages and 512 4K pages.

	-hpa


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