On Mon, Apr 12, 2021 at 10:17:17PM -0700, Axel Rasmussen wrote: > This is a preparatory commit. In the future, we want to be able to setup > alias mappings for area_src and area_dst in the shmem test, like we do > in the hugetlb_shared test. With a VMA obtained via > mmap(MAP_ANONYMOUS | MAP_SHARED), it isn't clear how to do this. > > So, mmap() with an fd, so we can create alias mappings. Use memfd_create > instead of actually passing in a tmpfs path like hugetlb does, since > it's more convenient / simpler to run, and works just as well. > > Future commits will: > > 1. Setup the alias mappings. > 2. Extend our tests to actually take advantage of this, to test new > userfaultfd behavior being introduced in this series. > > Also, a small fix in the area we're changing: when the hugetlb setup > fails in main(), pass in the right argv[] so we actually print out the > hugetlb file path. > > Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx> Reviewed-by: Peter Xu <peterx@xxxxxxxxxx> -- Peter Xu
