Re: Hugetlb demanding paging for -mm tree

From: William Lee Irwin III <wli_at_holomorphy.com>
Date: 2004-08-10 05:12:49
William Lee Irwin III wrote on Friday, August 06, 2004 2:08 PM
>> update_mmu_cache() does not appear to check the size of the translation
>> to be established in many architectures. e.g. on arch/ia64/ it does
>> flush_icache_range(addr, addr + PAGE_SIZE) unconditionally, and only
>> sets PG_arch_1 on a single struct page. Similar comments apply to
>> sparc64 and ppc64; I didn't check any others.

On Mon, Aug 09, 2004 at 11:19:04AM -0700, Chen, Kenneth W wrote:
> I suppose this is fixable in update_mmu_cache() where it can check the
> type of pte and do appropriate sizing and other things.  ia64 would have
> to check the address instead of looking at the pte.

Yes, it's just a fair amount of document-hunting since there isn't
always easily cut-and-pasteable stuff (e.g. ITAG_MASK for larger page
sizes was omitted from the #ifdefs on sparc64).

As for ia64 checking addresses... ew, can't we just use long format
VHPT? The virtual placement constraints are nasty.


-- wli
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Received on Mon Aug 9 15:32:22 2004

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