On Friday 13 October 2006 01:29, John Richard Moser wrote:
> True. You can trick the MMU into faulting into the kernel (PaX does
> this to apply non-executable pages-- pages, not halves of VM-- on x86),
Oooh, that is a neat hack!
> but it's orders of magnitude slower as I understand and the petty gains
> you can get over the hardware MMU doing it are not going to outweigh it.
It's architecture-dependent; not all architectures are even capeable of
walking the page table trees in hardware. They compensate with
lightweight traps for TLB cache misses.
Andrew Wade
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