Robin> For the 4-level case with 64k pages, what about just using Robin> 16k page tables? That leaves us with 60 bits of addressable Robin> space which is fairly close to the full space.
David> You're kidding, right? If getting "fairly close" to 64 bits was good David> enough, there would be no point for 64KB pages. User space will only end up with just over 63.5 bits since the kernel has grabbed regions 5, 6, 7 for itself. Unless someone comes up with a 16EB+16EB patch analogous to the 4G+4G ia32 patch :-) We also lose some space out of each region for the VHPT. Region 4 is reserved for hugetlb pages. Page 0 of region 0 is a NaT page. So we fall short of a full, flat 64-bit address space for a variety of reasons. Nonetheless, I agree with David that reducing available virtual space by a factor of 16 sounds like a poor idea. -Tony - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
