Messages in this thread | | | Subject | Re: Prezeroing V2 [0/3]: Why and When it works | From | Arjan van de Ven <> | Date | Thu, 23 Dec 2004 20:49:13 +0100 |
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> The most expensive operation in the page fault handler is (apart of SMP > locking overhead) the zeroing of the page. This zeroing means that all > cachelines of the faulted page (on Altix that means all 128 cachelines of > 128 byte each) must be loaded and later written back. This patch allows to > avoid having to load all cachelines if only a part of the cachelines of > that page is needed immediately after the fault.
eh why will all cachelines be loaded? Surely you can avoid the write- allocate behavior for this case.....
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