Documentation/vm/unevictable-lru.rst

70      system - which means we get to use the same code to manipulate them, the
71      same code to isolate them (for migrate, etc.), the same code to keep track
178 the pages in the region and "rescue" them from the unevictable list if no other
179 condition is keeping them unevictable.  If an unevictable region is destroyed,
181 freeing them.
238 were not migratable as isolate_lru_page() could not find them, and the LRU list
242 attempting to isolate them, thus abandoning the count of VM_LOCKED VMAs.  When
308 do end up getting faulted into this VM_LOCKED VMA, we'll handle them in the
342    these mappings are inherently pinned, so we don't need to mark them as
345    so there is no sense in attempting to visit them.
360 VM_LOCKED flag.  Therefore, we won't have to deal with them later during
507 way, so unmapping them required no processing.
591 would never see them.
609 after shrink_active_list() had moved them to the inactive list, or pages mapped
617 try_to_unmap().  shrink_page_list() will divert them to the unevictable list