Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

Nick Piggin
2005-11-04T00:56:57Z

Martin J. Bligh wrote:

>>These days we have things like per-cpu lists in front of the buddy
>>allocator that will make fragmentation somewhat higher, but it's still
>>absolutely true that the page allocation layout is _not_ random.
>
>
> OK, well I'll quit torturing you with incorrect math if you'll concede
> that the situation gets much much worse as memory sizes get larger ;-)
>

Let me add that as memory sized get larger, people are also looking
for more tlb coverage and less per page overhead.

Looks like ppc64 is getting 64K page support, at which point higher
order allocations (eg. for stacks) basically disappear don't they?

x86-64 I thought were also getting 64K page support but I can't
find a reference to it right now - at the very least I know Andi
wants to support larger soft pages for it.

ia64 is obviously already well covered.

--
SUSE Labs, Novell Inc.

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