Messages in this thread |  | | Subject | Re: Subtle MM bug | Date | Wed, 10 Jan 2001 19:36:43 +0000 (GMT) | From | Alan Cox <> |
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> I looked at it a year or two ago myself, and came to the conclusion that I > don't want to blow up our page table size by a factor of three or more, so > I'm not personally interested any more. Maybe somebody else comes up with > a better way to do it, or with a really compelling reason to.
There is only one reason I know for reverse page tables. That is ARM2/ARM3 support - which is still not fully merged because of this issue
The MMU on these systems is a CAM, and the mmu table is thus backwards to convention. (It also means you can notionally map two physical addresses to one virtual but thats undefined in the implementation ;))
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