Robert P. J. Day wrote:
>> The comment above empty_zero_page and zero_page_mask
>> declarations at arch/mips/mm/init.c:508 sheds light on this ...
>
> well, it *sort of* does. at line 64 of that file:
>
> /*
> * We have up to 8 empty zeroed pages so we can map one of the right colour
> * when needed. This is necessary only on R4000 / R4400 SC and MC versions
> * where we have to avoid VCED / VECI exceptions for good performance at
> * any price. Since page is never written to after the initialization we
> * don't have to care about aliases on other CPUs.
> */
>
> although it's not clear where in the source tree are the invocations
> that would actually make a difference to a MIPS system, which is why
> i've CC'ed ralf on this. i'm sure he can clear this up. :-)
x86 could also benefit from coloured zeropages. In fact, I thought it
already had them (K8 wants as many as 8.)
-hpa
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