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], which is in
progress, is an expected case. 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 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@xxxxxxxxx
[2] https://lore.kernel.org/20240408175228.91414-1-sj@xxxxxxxxxx
Changes from RFC
(https://lore.kernel.org/20250621173131.23917-1-sj@xxxxxxxxxx)
- Add documentation patches
- Wordsmith commit messages
- Rebase on latest mm-new
SeongJae Park (6):
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
Docs/ABI/damon: document schemes dests directory
Docs/admin-guide/mm/damon/usage: document dests directory
.../ABI/testing/sysfs-kernel-mm-damon | 22 ++
Documentation/admin-guide/mm/damon/usage.rst | 33 ++-
include/linux/damon.h | 29 +-
mm/damon/core.c | 4 +
mm/damon/sysfs-schemes.c | 253 +++++++++++++++++-
5 files changed, 333 insertions(+), 8 deletions(-)
base-commit: 8a6d44984fa3076b444a6ddd8a8898b6ba254d25
--
2.39.5
