Messages in this thread | | | Date | Sat, 14 Feb 1998 09:33:33 +0330 | From | mshar@vax ... | Subject | RE: How to read-protect a vm_area? |
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I looked in an i386 book. It has a Present bit and a Read/Write bit as part of its page protection system. I think it is simply not possible to read-protect a page without swapping it!
Apparently Intel's CPU designers don't care much about distributed sghared memory :-)
Thanks for the information about your work. I also considered using all the memory of a process in a DSM system, but decided not to do so. The first reason was that it requires more changes in the kernel. The second is that the programmer won't have much control over what is distributed and what is not. In DIPC, the programmer knows that using the shm might result in a network access, while other types of mem won't cause such a thing.
-Kamran
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