[PATCH 0/5] mm/damon: support addr_unit on default monitoring targets for modules

SeongJae Park
2026-03-11T05:29:31Z

DAMON_RECLAIM and DAMON_LRU_SORT support 'addr_unit' parameters only
when the monitoring target address range is explicitly set. This was
intentional for making the initial 'addr_unit' support change small.
Now 'addr_unit' support is being quite stabilized. Having the corner
case of the support is only making the code inconsistent with implicit
rules. The inconsistency makes it easy to confuse [1] readers. After
all, there is no real reason to keep 'addr_unit' support incomplete.
Add the support for the case to improve the readability and more
completely support 'addr_unit'.

This series is constructed with five patches. The first one (patch 1)
fixes a small bug that mistakenly assigns inclusive end address to open
end address, which was found from this work. The second and third ones
(patches 2 and 3) extend the default monitoring target setting functions
in the core layer one by one, to support the 'addr_unit' while making no
visible changes. The final two patches (patches 4 and 5) update
DAMON_RECLAIM and DAMON_LRU_SORT to support 'addr_unit' for the default
monitoring target address ranges, by passing the user input to the core
functions.

[1] https://lore.kernel.org/20260131015643.79158-1-sj@kernel.org

Changes from RFC
(https://lore.kernel.org/20260305053918.83786-1-sj@kernel.org)
- Rebase to latest mm-new.
- Wordsmith commit messages.

SeongJae Park (5):
mm/damon/core: fix wrong end address assignment on walk_system_ram()
mm/damon/core: support addr_unit on damon_find_biggest_system_ram()
mm/damon/core: receive addr_unit on
damon_set_region_biggest_system_ram_default()
mm/damon/reclaim: respect addr_unit on default monitoring region setup
mm/damon/lru_sort: respect addr_unit on default monitoring region
setup

include/linux/damon.h | 1 +
mm/damon/core.c | 36 +++++++++++++++++++++++++-----------
mm/damon/lru_sort.c | 7 +------
mm/damon/reclaim.c | 7 +------
mm/damon/stat.c | 2 +-
5 files changed, 29 insertions(+), 24 deletions(-)

base-commit: 31ae3f4d2741372ab511aeefc5e6898d12971fcd
--
2.47.3