Messages in this thread | | | Date | Sat, 13 Mar 2004 17:10:10 +0100 | From | Andi Kleen <> | Subject | Re: [Lse-tech] Re: Hugetlbpages in very large memory machines....... |
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> > 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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