Linux:Kernel:ReverseMapping
lastmod 2019-11-25created 2019-11-251 edits
Rmap is a way of reverse-mapping physical addresses to virtual addresses. The entries that are reverse-mapped are limited to pages corresponding to anon memory. It is used to find the page table entries used in each VM of every task that uses a shared anon page, and to remove those mappings.
The page table, the opposite of the reverse mapping above, is a way of mapping virtual addresses to physical addresses.