Messages in this thread |  | | | Date | Fri, 04 Nov 2005 12:22:18 +1100 | | From | Nick Piggin <> | | Subject | Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 |
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Linus Torvalds wrote: > > On Fri, 4 Nov 2005, Nick Piggin wrote: > >>Looks like ppc64 is getting 64K page support, at which point higher >>order allocations (eg. for stacks) basically disappear don't they? > > > Yes and no, HOWEVER, nobody sane will ever use 64kB pages on a > general-purpose machine. > > 64kB pages are _only_ usable for databases, nothing else. > > Why? Do the math. Try to cache the whole kernel source tree in 4kB pages > vs 64kB pages. See how the memory usage goes up by a factor of _four_. >
Yeah that's true. But Martin's worried about future machines with massive memories - so maybe it is safe to assume those will be using big pages, I don't know.
Maybe the solution is to bloat the kernel sources enough to make 64KB pages worthwhile?
-- SUSE Labs, Novell Inc.
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