On top of mm-stable.
This is my current set of tests for testing COW handling of anonymous memory, especially when interacting with GUP. I developed these tests while working on PageAnonExclusive and managed to clean them up just now.
On current upstream Linux, all tests pass except the hugetlb tests that rely on vmsplice -- these tests should pass as soon as vmsplice properly uses FOLL_PIN instead of FOLL_GET.
I'm working on additional tests for COW handling in private mappings, focusing on long-term R/O pinning e.g., of the shared zeropage, pagecache pages and KSM pages. These tests, however, will go into a different file. So this is everything I have regarding tests for anonymous memory.
Cc: Andrew Morton akpm@linux-foundation.org Cc: Shuah Khan shuah@kernel.org Cc: Jason Gunthorpe jgg@nvidia.com Cc: John Hubbard jhubbard@nvidia.com Cc: Nadav Amit namit@vmware.com Cc: Peter Xu peterx@redhat.com Cc: Andrea Arcangeli aarcange@redhat.com Cc: Vlastimil Babka vbabka@suse.cz Cc: Mike Rapoport rppt@kernel.org Cc: Christoph von Recklinghausen crecklin@redhat.com Cc: Don Dutile ddutile@redhat.com
David Hildenbrand (7): selftests/vm: anon_cow: test COW handling of anonymous memory selftests/vm: factor out pagemap_is_populated() into vm_util selftests/vm: anon_cow: THP tests selftests/vm: anon_cow: hugetlb tests selftests/vm: anon_cow: add liburing test cases mm/gup_test: start/stop/read functionality for PIN LONGTERM test selftests/vm: anon_cow: add R/O longterm tests via gup_test
mm/gup_test.c | 140 +++ mm/gup_test.h | 12 + tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 25 +- tools/testing/selftests/vm/anon_cow.c | 1126 ++++++++++++++++++++ tools/testing/selftests/vm/check_config.sh | 31 + tools/testing/selftests/vm/madv_populate.c | 8 - tools/testing/selftests/vm/run_vmtests.sh | 3 + tools/testing/selftests/vm/vm_util.c | 15 + tools/testing/selftests/vm/vm_util.h | 2 + 10 files changed, 1353 insertions(+), 10 deletions(-) create mode 100644 tools/testing/selftests/vm/anon_cow.c create mode 100644 tools/testing/selftests/vm/check_config.sh