Re: [Lse-tech] Re: Hugetlbpages in very large memory machines.......

From: Andi Kleen
Date: Sat Mar 13 2004 - 11:13:26 EST

> > fall back to smaller pages if possible (I was told it isn't easily
> > possible on IA64)
> That's not entirely true. Whether it's feasible depends on how the
> MMU is used. The HPW (Hardware Pagetable Walker) and short mode of the
> VHPT insist upon pagesize being a per-region attribute, where regions
> are something like 60-bit areas of virtualspace, which is likely what
> they're referring to. The VHPT in long mode should be capable of
> arbitrary virtual placement (modulo alignment of course).

Redesigning the low level TLB fault handling for this would not count as
"easily" in my book.

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