Re: enforcing page color matches

On May 25, 2011, at 8:11 AM, Eduardo Horvath wrote:

> On Wed, 25 May 2011, Matt Thomas wrote:
>
>> I'm using a MIPS 74K which needs strict page-coloring enforcement (4 colors for its Icache and 2 colors for its Dcache) so this is important to me.  If this can be enforced, the code to deal with bad colors can be removed and that will greatly simplify the mips pmap code.
>
> I don't think that you can get rid of the page coloring code.  What
> happens if you have two processes that have the same file mmap()ed to
> different page colors?  But reducing the need for it is good.

I think the mmap for one of those mappings should fail.