[PATCH v5 0/4] mm/damon: add support for hugepage_size DAMOS filter

[Usama Arif <usamaarif642@gmail.com>]

Patches 1-2 from v4 which are a requirement for this series
were sent separately by SJ and are merged in mm-unstable.

hugepage_size DAMOS filter can be used to gather statistics to
check if memory regions of specific access tempratures are backed
by hugepages of a size in a specific range. This filter can help
to observe and prove the effectivenes of different schemes for
shrinking/collapsing hugepages.

v4 -> v5: (SJ)
- Drop patches 1-2 which were merged.
- change filter name from 'hugepage' -> 'hugepage_size'.
- change struct name from damon_folio_size to damon_size_range.

v3 -> v4:
- Add support for large folios of all sizes, and not just
  PMD mapped hugepages (David and SJ).
- only get folio while checking access/ applying DAMOS
  scheme if the head page is also part of that region.

v2 -> v3:
- expose hugepage via sysfs even if the kernel is
  built without hugepage support. DAMON will just
  just return 0. (SJ Park)

v1 -> v2:
- Wrap DAMOS_FILTER_TYPE_HUGEPAGE case with
  CONFIG_PGTABLE_HAS_HUGE_LEAVES (SJ Park)

Usama Arif (4):
  mm/damon: introduce DAMOS filter type hugepage_size
  mm/damon/sysfs-schemes: add files for setting damos_filter->sz_range
  Docs/ABI/damon: document DAMOS sysfs files to set the min/max
    folio_size
  Docs/admin-guide/mm/damon/usage: Document hugepage_size filter type

 .../ABI/testing/sysfs-kernel-mm-damon         | 14 +++++
 Documentation/admin-guide/mm/damon/usage.rst  | 17 +++---
 include/linux/damon.h                         | 13 +++++
 mm/damon/core.c                               |  3 +
 mm/damon/paddr.c                              |  6 ++
 mm/damon/sysfs-schemes.c                      | 55 +++++++++++++++++++
 6 files changed, 100 insertions(+), 8 deletions(-)

-- 
2.43.5