On Mon, Mar 24, 2025 at 06:53:25AM +0000, Andrei Vagin wrote: > Introduce the PAGE_IS_GUARD flag in the PAGEMAP_SCAN ioctl to expose > information about guard regions. This allows userspace tools, such as > CRIU, to detect and handle guard regions. > > Currently, CRIU utilizes PAGEMAP_SCAN as a more efficient alternative to > parsing /proc/pid/pagemap. Without this change, guard regions are > incorrectly reported as swap-anon regions, leading CRIU to attempt > dumping them and subsequently failing. > > This series should be applied on top of "[PATCH 0/2] fs/proc/task_mmu: > add guard region bit to pagemap": > https://lore.kernel.org/all/2025031926-engraved-footer-3e9b@gregkh/T/ > > The series includes updates to the documentation and selftests to > reflect the new functionality. > > v2: > - sync linux/fs.h with the kernel sources > - address comments from Lorenzo and David. Thanks, sorry for delay, LSF/MM/BPF is why :) > > Andrei Vagin (3): > fs/proc: extend the PAGEMAP_SCAN ioctl to report guard regions > tools headers UAPI: Sync linux/fs.h with the kernel sources > selftests/mm: add PAGEMAP_SCAN guard region test > > Documentation/admin-guide/mm/pagemap.rst | 1 + > fs/proc/task_mmu.c | 17 ++++--- > include/uapi/linux/fs.h | 1 + > tools/include/uapi/linux/fs.h | 19 +++++++- > tools/testing/selftests/mm/guard-regions.c | 57 ++++++++++++++++++++++ > 5 files changed, 87 insertions(+), 8 deletions(-) > > -- > 2.49.0.rc1.451.g8f38331e32-goog >
