> 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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