linux-kernel - [PATCH 00/12] mm/damon: introduce DAMON parameters online commit function

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Date: Tue, 18 Jun 2024 11:17:57 -0700
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 00/12] mm/damon: introduce DAMON parameters online commit function

DAMON context struct (damon_ctx) contains user requests (parameters),
internal status, and operation results.  For flexible usages, DAMON API
users are encouraged to manually manipulate the struct.  That works well
for simple use cases.  However, it has turned out that it is not that
simple at least for online parameters udpate.  It is easy to forget
properly maintaining internal status and operation results.  Also, such
manual manipulation for online tuning is implemented multiple times on
DAMON API users including DAMON sysfs interface, DAMON_RECLAIM and
DAMON_LRU_SORT.  As a result, we have multiple sources of bugs for same
problem.  Actually we found and fixed a few bugs from online parameter
updating of DAMON API users.

Implement a function for online DAMON parameters update in core layer,
and replace DAMON API users' manual manipulation code for the use case.
The core layer function could still have bugs, but this change reduces
the source of bugs for the problem to one place.

SeongJae Park (12):
  mm/damon/core: implement DAMOS quota goals online commit function
  mm/damon/core: implement DAMON context commit function
  mm/damon/sysfs: use damon_commit_ctx()
  mm/damon/sysfs-schemes: use damos_commit_quota_goals()
  mm/damon/sysfs: remove unnecessary online tuning handling code
  mm/damon/sysfs: rename damon_sysfs_set_targets() to ...add_targets()
  mm/damon/sysfs-schemes: remove unnecessary online tuning handling code
  mm/damon/sysfs-schemes: rename
    *_set_{schemes,scheme_filters,quota_score,schemes}()
  mm/damon/reclaim: use damon_commit_ctx()
  mm/damon/reclaim: remove unnecessary code for online tuning
  mm/damon/lru_sort: use damon_commit_ctx()
  mm/damon/lru_sort: remove unnecessary online tuning handling code

 include/linux/damon.h    |   2 +
 mm/damon/core.c          | 333 +++++++++++++++++++++++++++++++++++++++
 mm/damon/lru_sort.c      |  53 +++----
 mm/damon/reclaim.c       |  62 +++-----
 mm/damon/sysfs-common.h  |   2 +-
 mm/damon/sysfs-schemes.c |  94 +++--------
 mm/damon/sysfs-test.h    |  10 +-
 mm/damon/sysfs.c         |  81 +++-------
 8 files changed, 425 insertions(+), 212 deletions(-)

base-commit: a7b6f23b7fa3f5d1f3ae64034a4aff12fb8c1df0
-- 
2.39.2