brody-qq 3e9b269bcd Kernel/Memory: Make mmap objects track dirty pages ...

InodeVMObjects now track dirty and clean pages. This tracking of
dirty and clean pages is used by the msync and purge syscalls.

dirty page tracking works using the following rules:
* when a new InodeVMObject is made, all pages are marked clean.
* writes to clean InodeVMObject pages will cause a page fault,
  the fault handler will mark the page as dirty.
* writes to dirty InodeVMObject pages do not cause page faults.
* if msync is called, only dirty pages are flushed to storage (and
  marked clean).
* if purge syscall is called, only clean pages are discarded.

2024-07-07 18:25:32 +02:00

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