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> on nommu, you don't have any application isolation That isn't necessarily the case. You can have memory protection without a MMU - for instance, most ARM Cor
by duskwuff 1y ago
> on nommu, you don't have any application isolation
That isn't necessarily the case. You can have memory protection without a MMU - for instance, most ARM Cortex-M parts have a MPU which can be used to restrict a thread's access to memory ranges or to hardware. What it doesn't get you is memory remapping, which is necessary for features like virtual memory.
- rasz 1y agovirtual memory as in swap is one, but imo bigger one is memory-mapped files
- tombl 1y agoYeah, nommu absolutely doesn't imply zero memory isolation. I have a kernel port to an architecture with a nonstandard way of doing memory isolation and the existing nommu infrastructure is the only reason it can exist.