Messages in this thread | | | Date | Fri, 7 Mar 2003 10:36:47 -0800 | From | William Lee Irwin III <> | Subject | Re: Minutes from LSE Call March 7 |
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On Fri, Mar 07, 2003 at 10:34:29AM -0800, Hanna Linder wrote: > Bill is using some simplified heuristics to search > for pages to fault in. Turns out those heuristics > suck so he needs to go in and do a different set. > The ones originally done in Hugh's patch did something > in the order of scanning acros an entire vma looking > for pte's pointing to a particular page. It didnt > have any alignment restrictions. Bill does have > alignment restrictions and Hugh's solution would > break down pretty quickly (kernel compiles swapping).
The bit about Hugh's heuristics is backward; the heuristics he used for 2.4.x were very effective. It's my homegrown heuristics that are breaking down very quickly wrt. performance and fragmentation.
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