Re: large page patch (fwd) (fwd)

From: David Mosberger (
Date: Tue Aug 06 2002 - 00:19:24 EST

>>>>> On Mon, 05 Aug 2002 21:58:17 -0700 (PDT), "David S. Miller" <> said:

>> From: David Mosberger <> Date:
>> Mon, 5 Aug 2002 22:01:16 -0700

>> In my opinion, this is perhaps the strongest argument
>> *for* a separate "giant page" syscall interface. It will be
>> very hard (perhaps impossible) to optimize superpages to work
>> efficiently when the ratio of superpage/basepage grows huge
>> (as, by definition, the kernel would manage them as a set of
>> basepages).

  DaveM> Actually, this is one of the reasons there was a lot of
  DaveM> research into using sub-page clustering for large mappings in
  DaveM> the TLB. Basically how this worked is that for a superpage,
  DaveM> you could stick multiple sub-mappings into the entry such
  DaveM> that you didn't need a fully physically contiguous superpage.

Sounds great if you have the hardware that can do it. Not too many
CPUs I know of support it.

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