=========== Test matrix =========== rusage010: app->mmap() 2M,anon,pre-page ->set_range()->munmap()->free_process_memory_range()->clear_range()[OK] rusage005: device file (ib ping-pong) devobj()->get_page()->pf->munmap()->clear_range() [OK] remote page fault->cow->clear_range() [OK] ld-linux.so->mmap private->cow->clear_range() [OK] rusage008: sharing file-map page fork()->filemap->pf->clear_range() [OK] rusage009: sharing shmget() page fork()->shmat()->pf->clear_range() [OK] rusage011: sharing xpmem page fork()->xpmem_attach()->pf->clear_range() [OK]