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

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Message-Id: <20250207212033.45269-1-sj@kernel.org>
Date: Fri,  7 Feb 2025 13:20:31 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	Usama Arif <usamaarif642@...il.com>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	stable@...r.kernel.org
Subject: [PATCH 0/2] mm/damon/paddr: fix large folios access and schemes handling

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/20250203225604.44742-1-usamaarif642@gmail.com
[2] https://lore.kernel.org/20250206231103.38298-1-sj@kernel.org

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
-- 
2.39.5