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    SubjectRe: Subtle MM bug
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    Ralf Baechle <ralf@uni-koblenz.de> writes:

    > On Fri, Jan 12, 2001 at 09:11:43PM +0000, Russell King wrote:
    >
    > > Eric W. Biederman writes:
    > > > Hmm. I would think that increasing the logical page size in the kernel
    > > > would be the trivial way to handle virtual aliases. (i.e.) with a large
    > > > enough page size you can't actually have a virtual alias.
    > >
    > > There are types of caches out there that no matter how large the page size,
    > > you will always have alias issues. These are ones where the cache lines
    > > are indexed independent of virtual address (and therefore can have funny
    > > cache line replacement algorithms).
    > >
    > > And yes, you guessed which processor has it. ;)

    Odd. Does this affect correctness?

    > I recently spoke with some CPU architecture researcher at some university
    > about cache architectures; I suspect in the near future we'll see more
    > funny cache indexing and replacment algorithems ...

    But I doubt many of those will run incorrectly if just less efficiently if
    the OS doesn't help you avoid aliases.


    Eric
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