From: SeongJae Park <sj@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: SeongJae Park <sj@kernel.org>,
damon@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH 03/11] mm/damon/core: introduce DAMOS_QUOTA_GOAL_TUNER_TEMPORAL
Date: Mon, 9 Mar 2026 18:05:19 -0700 [thread overview]
Message-ID: <20260310010529.91162-4-sj@kernel.org> (raw)
In-Reply-To: <20260310010529.91162-1-sj@kernel.org>
Introduce a new goal-based DAMOS quota auto-tuning algorithm, namely
DAMOS_QUOTA_GOAL_TUNER_TEMPORAL (temporal in short). The algorithm aims
to trigger the DAMOS action only for a temporal time, to achieve the
goal as soon as possible. For the temporal period, it uses as much
quota as allowed. Once the goal is achieved, it sets the quota zero, so
effectively makes the scheme be deactivated.
Signed-off-by: SeongJae Park <sj@kernel.org>
---
include/linux/damon.h | 2 ++
mm/damon/core.c | 29 ++++++++++++++++++++++++-----
2 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/include/linux/damon.h b/include/linux/damon.h
index 0824b953492e8..1130c2f9a92f4 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -218,9 +218,11 @@ struct damos_quota_goal {
/**
* enum damos_quota_goal_tuner - Goal-based quota tuning logic.
* @DAMOS_QUOTA_GOAL_TUNER_CONSIST: Aim long term consistent quota.
+ * @DAMOS_QUOTA_GOAL_TUNER_TEMPORAL: Aim zero quota asap.
*/
enum damos_quota_goal_tuner {
DAMOS_QUOTA_GOAL_TUNER_CONSIST,
+ DAMOS_QUOTA_GOAL_TUNER_TEMPORAL,
};
/**
diff --git a/mm/damon/core.c b/mm/damon/core.c
index d351ef3bcf4e9..2e36024d99506 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2345,6 +2345,26 @@ static unsigned long damos_quota_score(struct damos_quota *quota)
return highest_score;
}
+static void damos_goal_tune_esz_bp_consist(struct damos_quota *quota)
+{
+ unsigned long score = damos_quota_score(quota);
+
+ quota->esz_bp = damon_feed_loop_next_input(
+ max(quota->esz_bp, 10000UL), score);
+}
+
+static void damos_goal_tune_esz_bp_temporal(struct damos_quota *quota)
+{
+ unsigned long score = damos_quota_score(quota);
+
+ if (score >= 10000)
+ quota->esz_bp = 0;
+ else if (quota->sz)
+ quota->esz_bp = quota->sz * 10000;
+ else
+ quota->esz_bp = ULONG_MAX;
+}
+
/*
* Called only if quota->ms, or quota->sz are set, or quota->goals is not empty
*/
@@ -2359,11 +2379,10 @@ static void damos_set_effective_quota(struct damos_quota *quota)
}
if (!list_empty("a->goals)) {
- unsigned long score = damos_quota_score(quota);
-
- quota->esz_bp = damon_feed_loop_next_input(
- max(quota->esz_bp, 10000UL),
- score);
+ if (quota->goal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)
+ damos_goal_tune_esz_bp_consist(quota);
+ else if (quota->goal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)
+ damos_goal_tune_esz_bp_temporal(quota);
esz = quota->esz_bp / 10000;
}
--
2.47.3
next prev parent reply other threads:[~2026-03-10 1:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-10 1:05 [PATCH 00/11] mm/damon: support multiple goal-based quota tuning algorithms SeongJae Park
2026-03-10 1:05 ` [PATCH 01/11] mm/damon/core: introduce damos_quota_goal_tuner SeongJae Park
2026-03-10 1:05 ` [PATCH 02/11] mm/damon/core: allow quota goals set zero effective size quota SeongJae Park
2026-03-10 1:05 ` SeongJae Park [this message]
2026-03-10 1:05 ` [PATCH 04/11] mm/damon/sysfs-schemes: implement quotas->goal_tuner file SeongJae Park
2026-03-10 1:05 ` [PATCH 05/11] Docs/mm/damon/design: document the goal-based quota tuner selections SeongJae Park
2026-03-10 1:05 ` [PATCH 06/11] Docs/admin-guide/mm/damon/usage: document goal_tuner sysfs file SeongJae Park
2026-03-10 1:05 ` [PATCH 07/11] Docs/ABI/damon: update for goal_tuner SeongJae Park
2026-03-10 1:05 ` [PATCH 08/11] mm/damon/tests/core-kunit: test goal_tuner commit SeongJae Park
2026-03-10 1:05 ` [PATCH 09/11] selftests/damon/_damon_sysfs: support goal_tuner setup SeongJae Park
2026-03-10 1:05 ` [PATCH 10/11] selftests/damon/drgn_dump_damon_status: support quota goal_tuner dumping SeongJae Park
2026-03-10 1:05 ` [PATCH 11/11] selftests/damon/sysfs.py: test goal_tuner commit SeongJae Park
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