On 07/17/2010 07:31 AM, Gleb Natapov wrote:
Currently pages allocated for guest memory are required to be RW, so after your series
behaviour will remain exactly the same as before.
Except KSM pages.
KSM page will be COWed by __get_user_pages_fast(addr, 1, 1, page) in
get_user_page_and_protection() just like it COWed now, no?
Well, we don't want to COW it on write faults.
The optimal behaviour is:
- write faults: COW and instantiate a writeable spte
- read faults: instantiate a readable spte; if likely(page is
writeable), make it a writeable spte; if likely(page is dirty) make it a
dirty spte
- speculative spte instantiations: if likely(page is present)
instantiate a pte; if accessed, mark it accessed, if writeable, mark it
writeable; if dirty, mark it dirty
--
error compiling committee.c: too many arguments to function
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