Messages in this thread | | | Date | Thu, 12 Feb 1998 11:00:09 +0100 (CET) | From | MOLNAR Ingo <> | Subject | Re: PPro: Global flag in page table |
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On Wed, 11 Feb 1998, Nat Friedman wrote:
> I was just reading through some Intel docs and noticed that the Pentium Pro > introduced a Global flag for for page table and page directory entries. When > this flag is set on an entry, and the PGE (Page Global Enable) flag is set > in register CR4, the entry is not invalidated in the TLB on a task switch. > My understanding of this is crude, so be gentle if I've misunderstood, but > I don't think that this is implemented for Linux and was wondering if the > benefits warranted implementing it.
Linus implemented PPro PGE support in ~2.1.30 or so. We use it to preserve kernel page table TLB entries across task switches.
-- mingo
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