Messages in this thread | | | Subject | Re: Atomic operation for physically moving a page | From | Dave Hansen <> | Date | Fri, 18 Jun 2004 19:53:52 -0700 |
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On Fri, 2004-06-18 at 18:03, Valdis.Kletnieks@vt.edu wrote: > On Fri, 18 Jun 2004 17:37:12 PDT, Ashwin Rao <ashwin_s_rao@yahoo.com> said: > > I want to copy a page from one physical location to > > another (taking the appr. locks). > > At the risk of sounding stupid, what problem are you trying to solve by copying > a page? Not only (as you note) could the page be referenced by multiple > processes, it could (conceivably) belong to a kernel slab or something, or be a > buffer for an in-flight I/O request, or any number of other possibly-racy > situations.
You also have to make sure that the page is something who's physical address is allowed to change. Some stuff like DMA buffers, or a part of a hugetlb page might not even be valid to move.
-- Dave
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