linux-kernel - [PATCH 0/2] add a knob to control whether to use other nodes at the same tier of the target node in DAMON

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Message-ID: <20250528111038.18378-1-wangchuanguo@inspur.com>
Date: Wed, 28 May 2025 19:10:36 +0800
From: wangchuanguo <wangchuanguo@...pur.com>
To: <akpm@...ux-foundation.org>, <hannes@...xchg.org>, <sj@...nel.org>
CC: <david@...hat.com>, <mhocko@...nel.org>, <zhengqi.arch@...edance.com>,
	<shakeel.butt@...ux.dev>, <lorenzo.stoakes@...cle.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <damon@...ts.linux.dev>, wangchuanguo
	<wangchuanguo@...pur.com>
Subject: [PATCH 0/2] add a knob to control whether to use other nodes at the same tier of the target node in DAMON

In DAMON's migrate_hot and migrate_cold features, the code was
intended to migrate pages only to the node specified by target_nid.
However, during testing, it was observed that memory allocation
and migration could occur on any nodes, which is a BUG.
The first patch in this PR fix this issue.

A use_nodes_of_tier file has been added under the directory /sys/kernel/mm/damon/admin/kdamonds/<N>/contexts/<N>/schemes/<N>/
to control whether to use other nodes in the same tier as
the target node for migration.

wangchuanguo (2):
  mm: migrate: restore the nmask after successfully allocating on the 
    target node
  mm/damon/sysfs-schemes: add use_nodes_of_tier on sysfs-schemes

 include/linux/damon.h        |  9 ++++++++-
 include/linux/memory-tiers.h |  5 +++++
 mm/damon/core.c              |  6 ++++--
 mm/damon/lru_sort.c          |  3 ++-
 mm/damon/paddr.c             | 19 ++++++++++++-------
 mm/damon/reclaim.c           |  3 ++-
 mm/damon/sysfs-schemes.c     | 31 ++++++++++++++++++++++++++++++-
 mm/memory-tiers.c            | 13 +++++++++++++
 mm/vmscan.c                  |  2 +-
 samples/damon/mtier.c        |  3 ++-
 samples/damon/prcl.c         |  3 ++-
 11 files changed, 81 insertions(+), 16 deletions(-)

-- 
2.39.3