>> I wasn't disagreeing with your case for separate large page
>> syscalls. Those syscalls certainly simplify implementation and,
>> as you point out, it well may be the case that a transparent
>> superpage scheme never will be able to replace the former.
Linus> Somebody already had patches for the transparent superpage
Linus> thing for alpha, which supports it. I remember seeing numbers
Linus> implying that helped noticeably.
Yes, I saw those. I still like the Rice work a _lot_ better. It's
just a thing of beauty, from a design point of view (disclaimer: I
haven't seen the implementation, so there may be ugly things
Linus> But yes, that definitely doesn't work for humongous pages (or
Linus> whatever we should call the multi-megabyte-special-case-thing
Yes, you're probably right. 2MB was reported to be fine in the Rice
experiments, but I doubt 256MB (and much less 4GB, as supported by
some CPUs) would fly.
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