linux-kernel - [RFC PATCH -next 00/16] mm/damon: support ARM32 with LPAE

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Message-ID: <20250813050706.1564229-1-yanquanmin1@huawei.com>
Date: Wed, 13 Aug 2025 13:06:50 +0800
From: Quanmin Yan <yanquanmin1@...wei.com>
To: <sj@...nel.org>
CC: <akpm@...ux-foundation.org>, <damon@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<yanquanmin1@...wei.com>, <wangkefeng.wang@...wei.com>, <zuoze1@...wei.com>
Subject: [RFC PATCH -next 00/16] mm/damon: support ARM32 with LPAE

Previously, DAMON's physical address space monitoring only supported
memory ranges below 4GB on LPAE-enabled systems. This was due to
the use of 'unsigned long' in 'struct damon_addr_range', which is
32-bit on ARM32 even with LPAE enabled.

Implements DAMON compatibility for ARM32 with LPAE enabled.

Patches 01/16 through 10/16 are from the mailing list[1], add a new core
layer parameter called 'addr_unit'. Operations set layer can translate a
core layer address to the real address by multiplying the parameter value
to the core layer address.

Patches 11/16 through 14/16 extend and complement patches 01~10, addressing
various issues introduced by the addr_unit implementation.

Patches 15/16 and 16/16 complete native DAMON support for 32-bit systems.

[1] https://lore.kernel.org/all/20250416042551.158131-1-sj@kernel.org/

Quanmin Yan (6):
  mm/damon: add addr_unit for DAMON_RECLAIM and LRU_SORT
  mm/damon: add damon_ctx->min_region and damon_target->min_region
  mm/damon/sysfs: ensure valid addr_unit setting in
    damon_sysfs_apply_inputs()
  mm/damon/core: convert sz to byte units when updating state
  mm/damon: the byte statistics data type in damos_stat uses unsigned
    long long
  mm/damon/core: handle quota->esz overflow issues

SeongJae Park (10):
  mm/damon/core: add damon_ctx->addr_unit
  mm/damon/paddr: support addr_unit for access monitoring
  mm/damon/paddr: support addr_unit for DAMOS_PAGEOUT
  mm/damon/paddr: support addr_unit for DAMOS_LRU_[DE]PRIO
  mm/damon/paddr: support addr_unit for MIGRATE_{HOT,COLD}
  mm/damon/paddr: support addr_unit for DAMOS_STAT
  mm/damon/sysfs: implement addr_unit file under context dir
  Docs/mm/damon/design: document 'address unit' parameter
  Docs/admin-guide/mm/damon/usage: document addr_unit file
  Docs/ABI/damon: document addr_unit file

 .../ABI/testing/sysfs-kernel-mm-damon         |  7 ++
 Documentation/admin-guide/mm/damon/usage.rst  | 11 ++-
 Documentation/mm/damon/design.rst             | 16 +++-
 include/linux/damon.h                         | 24 +++--
 mm/damon/core.c                               | 80 +++++++++++-----
 mm/damon/lru_sort.c                           | 16 +++-
 mm/damon/modules-common.c                     |  5 +-
 mm/damon/modules-common.h                     |  6 +-
 mm/damon/paddr.c                              | 95 ++++++++++++-------
 mm/damon/reclaim.c                            | 16 +++-
 mm/damon/stat.c                               |  2 +-
 mm/damon/sysfs-schemes.c                      | 12 +--
 mm/damon/sysfs.c                              | 27 ++++++
 13 files changed, 226 insertions(+), 91 deletions(-)

-- 
2.34.1