mm-damon-ops-common-use-nr_accesses-moving-sum-for-quota-score.patch removed from -mm tree

The quilt patch titled
Subject: mm/damon/ops-common: use nr_accesses moving sum for quota score
has been removed from the -mm tree. Its filename was
mm-damon-ops-common-use-nr_accesses-moving-sum-for-quota-score.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SJ Park <[email protected]>
Subject: mm/damon/ops-common: use nr_accesses moving sum for quota score
Date: Sun, 19 Jul 2026 09:11:33 -0700

Since commit 42f994b71404 ("mm/damon/core: implement scheme-specific apply interval"), DAMOS scheme can be applied at any time. At that time, nr_accesses may not be fully aggregated. But the quota prioritization score is calculated using the not fully aggregated count. As a result, the performance of DAMOS could be degraded. Fix by using damon_nr_accesses_mvsum() instead.

The user impact of the issue is suboptimum DAMOS performance under certain setups. Nonetheless, the bug was there from the beginning of the setup availability. In other words, the suboptimum performance is the baseline of the setup and hence it didn't cause regression. Also the extent of the suboptimality was not big enough to be found from users and testers. Still, this is a clear bug that is better to be fixed, and can be easily fixed.

---

 mm/damon/ops-common.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -111,8 +111,9 @@ int damon_hot_score(struct damon_ctx *c,
 	unsigned int age_weight = s->quota.weight_age;
 	int hotness;
 
-	freq_subscore = r->nr_accesses * DAMON_MAX_SUBSCORE /
-		damon_nr_samples_per_aggr(&c->attrs);
+	freq_subscore = mult_frac(damon_nr_accesses_mvsum(r, c),
+			DAMON_MAX_SUBSCORE,
+			damon_nr_samples_per_aggr(&c->attrs));
 
 	age_in_sec = (unsigned long)r->age * c->attrs.aggr_interval / 1000000;
 	if (age_in_sec)

_

Patches currently in -mm which might be from [email protected] are