Generally, the documentation we wrote for hugetlbfs-based minor faults still all applies. The only missing piece is to mention the new feature flag which indicates that the kernel supports this for shmem as well.
Signed-off-by: Axel Rasmussen axelrasmussen@google.com --- Documentation/admin-guide/mm/userfaultfd.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/mm/userfaultfd.rst b/Documentation/admin-guide/mm/userfaultfd.rst index 3aa38e8b8361..6528036093e1 100644 --- a/Documentation/admin-guide/mm/userfaultfd.rst +++ b/Documentation/admin-guide/mm/userfaultfd.rst @@ -77,7 +77,8 @@ events, except page fault notifications, may be generated:
- ``UFFD_FEATURE_MINOR_HUGETLBFS`` indicates that the kernel supports ``UFFDIO_REGISTER_MODE_MINOR`` registration for hugetlbfs virtual memory - areas. + areas. ``UFFD_FEATURE_MINOR_SHMEM`` is the analogous feature indicating + support for shmem virtual memory areas.
The userland application should set the feature flags it intends to use when invoking the ``UFFDIO_API`` ioctl, to request that those features be