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You don't need a reverse mapping to do COW, when you get a pagefault you know the virtual address which caused it.
Reverse mapping is needed to find all virtual pages belonging to a certain physical one. That isn't needed often for anonymous memory.
The case of the overly anonymous anon_vma
Posted May 3, 2010 16:51 UTC (Mon) by efexis (guest, #26355)
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