[PATCH 0/2] fs/proc/task_mmu: add guard region bit to pagemap

From: Lorenzo Stoakes
Date: Fri Feb 21 2025 - 07:09:33 EST


Currently there is no means of determining whether a give page in a mapping
range is designated a guard region (as installed via madvise() using the
MADV_GUARD_INSTALL flag).

This is generally not an issue, but in some instances users may wish to
determine whether this is the case.

This series adds this ability via /proc/$pid/pagemap, updates the
documentation and adds a self test to assert that this functions correctly.

Lorenzo Stoakes (2):
fs/proc/task_mmu: add guard region bit to pagemap
tools/selftests: add guard region test for /proc/$pid/pagemap

Documentation/admin-guide/mm/pagemap.rst | 3 +-
fs/proc/task_mmu.c | 6 ++-
tools/testing/selftests/mm/guard-regions.c | 47 ++++++++++++++++++++++
tools/testing/selftests/mm/vm_util.h | 1 +
4 files changed, 55 insertions(+), 2 deletions(-)

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2.48.1