Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU) | Date | Tue, 14 Jul 2009 18:22:06 +0100 |
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Mike Frysinger <vapier@gentoo.org> wrote:
> Some architectures (like the Blackfin arch) implement some of the > "simpler" features that one would expect out of a MMU such as memory > protection. In our case, we actually get read/write/exec protection > down to the page boundary so processes can't stomp on each other let > alone the kernel. There is a performance decrease (which depends greatly > on the workload) however as the hardware/software interaction was not > optimized at design time.
It occurs to me that I could probably test this on FRV by using the MMU in a limited way. How do you actually keep track of the protections applied? Do you have a single global page table that is managed by the mmap code on a per-VMA basis?
David
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