linux-kernel - [RFC PATCH 0/4] mm/damon: add DAMOS_MIGRATE_{HOT,COLD} destination nodes and weights

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Message-Id: <20250621173131.23917-1-sj@kernel.org>
Date: Sat, 21 Jun 2025 10:31:27 -0700
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bijan Tabatabai <bijantabatab@...ron.com>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 0/4] mm/damon: add DAMOS_MIGRATE_{HOT,COLD} destination nodes and weights

DAMOS_MIGRATE_{HOT,COLD} action can migrate pages to only single node.
It could be useful to allow it migrates pages to multiple nodes with
different weights.  A work for dynamic interleaving[1] is in progress.
We also discussed this could be useful for memory tiering, e.g., when we
want to move pages to multiple noes of same tier.

Extend the API and ABI interface for specifying the multiple destination
nodes and their weights.

Note that this RFC is a prototype of the interface change for Bijan's
interleaving work[1].  Hence this patch series is only implementing the
interface part, not the real implementation of the migration behavior.

[1] https://lore.kernel.org/20250620180458.5041-1-bijan311@gmail.com
[2] https://lore.kernel.org/20240408175228.91414-1-sj@kernel.org

SeongJae Park (4):
  mm/damon: add struct damos_migrate_dest
  mm/damon/core: add damos->migrate_dest field
  mm/damon/sysfs-schemes: implement DAMOS action destinations directory
  mm/damon/sysfs-schemes: set damos->migrate_dest

 include/linux/damon.h    |  29 ++++-
 mm/damon/core.c          |   4 +
 mm/damon/sysfs-schemes.c | 253 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 282 insertions(+), 4 deletions(-)

base-commit: 78745efafbb93197e476717385616ed57ea2df22
-- 
2.39.5