mbox series

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

Message ID 20250211124437.278873-1-usamaarif642@gmail.com (mailing list archive)
Headers show
Series mm/damon: add support for hugepage_size DAMOS filter | expand

Message

Usama Arif Feb. 11, 2025, 12:43 p.m. UTC 
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(-)

Comments

SeongJae Park Feb. 11, 2025, 6:06 p.m. UTC | #1 
Hi Usama,

On Tue, 11 Feb 2025 12:43:39 +0000 Usama Arif <usamaarif642@gmail.com> wrote:

> 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.

Thank you again for continuing this great work.  All patches of this series
look good to me, so I added my Reviewed-by: tags to the whole.

Also Cc-ing Andrew, since I think this patch series may better to be queued on
mm-unstable for wider testing.


Thanks,
SJ

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