| To: | Ralf Baechle <ralf@linux-mips.org> |
|---|---|
| Subject: | Re: [PATCH] 64K page size |
| From: | Peter Watkins <treestem@gmail.com> |
| Date: | Thu, 31 Aug 2006 11:12:02 -0400 |
| Cc: | linux-mips@linux-mips.org |
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Ralf Baechle wrote: The code in pgtable-64.h assumes TASK_SIZE is always bigger than a first level PGDIR_SIZE. This is not the case for 64K pages, where task size is 40 bits (1TB) and a pgd entry can map 42 bits. This leads to USER_PTRS_PER_PGD being zero for 64K pages.Do you actually need large address space? The kernel could allow 2, 3 and 4-level pagetables easily but doesn't give that choice currently. Yes, in some cases. I'd like to benchmark the performance difference between 2 and 3 level pagetables, so the choice is valuable. |
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