Messages in this thread | | | Subject | Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE) | From | Dave Hansen <> | Date | Thu, 12 Jul 2007 09:34:57 -0700 |
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On Thu, 2007-07-12 at 18:31 +0200, Andrea Arcangeli wrote: > On Fri, Jul 13, 2007 at 12:44:49AM +1000, David Chinner wrote: > > That's crap. Just because a machine has lots of memory does not > > make it OK to waste lots of memory. > > It's not just wasted, it lowers overhead all over the place. Yes, the > benefit of wasting less pagecache may largely outweight the benefit of > having a larger page size, but if you've a lot of memory perhaps your > working set already fits in the cache, or perhaps you don't fit in the > cache regardless of the page size.
Have you guys seen Shaggy's page cache tails?
http://kernel.org/pub/linux/kernel/people/shaggy/OLS-2006/kleikamp.pdf
We've had the same memory waste issue on ppc64 with 64k hardware pages.
-- Dave
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