[0/2] mm/damon/paddr: fix large folios access and schemes handling

Message

SeongJae Park Feb. 7, 2025, 9:20 p.m. UTC

DAMON operations set for physical address space, namely 'paddr', treats
tail pages as unaccessed always.  It can also apply DAMOS action to
a large folio multiple times within single DAMOS' regions walking.  As a
result, the monitoring output has poor quality and DAMOS works in
unexpected ways when large folios are being used.  Fix those.

The patches were parts of Usama's hugepage_size DAMOS filter patch
series[1].  The first fix has collected from there with a slight commit
message change for the subject prefix.  The second fix is re-written by
SJ and posted as an RFC before this series.  The second one also got a
slight commit message change for the subject prefix.

[1] https://lore.kernel.org/[e-mail]
[2] https://lore.kernel.org/[e-mail]

SeongJae Park (1):
  mm/damon: avoid applying DAMOS action to same entity multiple times

Usama Arif (1):
  mm/damon/ops: have damon_get_folio return folio even for tail pages

 include/linux/damon.h | 11 +++++++++
 mm/damon/core.c       |  1 +
 mm/damon/ops-common.c |  2 +-
 mm/damon/paddr.c      | 57 +++++++++++++++++++++++++++++++------------
 4 files changed, 55 insertions(+), 16 deletions(-)


base-commit: 9c9a75a50e600803a157f4fc76cb856326406ce4