[merged mm-stable] mm-damon-core-remove-damon_moving_sum-and-its-unit-test.patch removed from -mm tree

[merged mm-stable] mm-damon-core-remove-damon_moving_sum-and-its-unit-test.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/core: remove damon_moving_sum() and its unit test
has been removed from the -mm tree.  Its filename was
     mm-damon-core-remove-damon_moving_sum-and-its-unit-test.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 <sj@kernel.org>
Subject: mm/damon/core: remove damon_moving_sum() and its unit test
Date: Mon, 29 Jun 2026 21:08:10 -0700

damon_moving_sum() is no longer being called for real purpose but its unit
test.  Testing a function that is not being used for real users makes no
sense.  Remove the test and the function.

Link: https://lore.kernel.org/20260630040812.149729-18-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core.c             |   40 ----------------------------------
 mm/damon/tests/core-kunit.h |   16 -------------
 2 files changed, 56 deletions(-)

--- a/mm/damon/core.c~mm-damon-core-remove-damon_moving_sum-and-its-unit-test
+++ a/mm/damon/core.c
@@ -3789,46 +3789,6 @@ int damon_set_region_system_rams_default
 	return damon_set_regions(t, &addr_range, 1, min_region_sz);
 }
 
-/*
- * damon_moving_sum() - Calculate an inferred moving sum value.
- * @mvsum:	Inferred sum of the last @len_window values.
- * @nomvsum:	Non-moving sum of the last discrete @len_window window values.
- * @len_window:	The number of last values to take care of.
- * @new_value:	New value that will be added to the pseudo moving sum.
- *
- * Moving sum (moving average * window size) is good for handling noise, but
- * the cost of keeping past values can be high for arbitrary window size.  This
- * function implements a lightweight pseudo moving sum function that doesn't
- * keep the past window values.
- *
- * It simply assumes there was no noise in the past, and get the no-noise
- * assumed past value to drop from @nomvsum and @len_window.  @nomvsum is a
- * non-moving sum of the last window.  For example, if @len_window is 10 and we
- * have 25 values, @nomvsum is the sum of the 11th to 20th values of the 25
- * values.  Hence, this function simply drops @nomvsum / @len_window from
- * given @mvsum and add @new_value.
- *
- * For example, if @len_window is 10 and @nomvsum is 50, the last 10 values for
- * the last window could be vary, e.g., 0, 10, 0, 10, 0, 10, 0, 0, 0, 20.  For
- * calculating next moving sum with a new value, we should drop 0 from 50 and
- * add the new value.  However, this function assumes it got value 5 for each
- * of the last ten times.  Based on the assumption, when the next value is
- * measured, it drops the assumed past value, 5 from the current sum, and add
- * the new value to get the updated pseduo-moving average.
- *
- * This means the value could have errors, but the errors will be disappeared
- * for every @len_window aligned calls.  For example, if @len_window is 10, the
- * pseudo moving sum with 11th value to 19th value would have an error.  But
- * the sum with 20th value will not have the error.
- *
- * Return: Pseudo-moving average after getting the @new_value.
- */
-static unsigned int damon_moving_sum(unsigned int mvsum, unsigned int nomvsum,
-		unsigned int len_window, unsigned int new_value)
-{
-	return mvsum - nomvsum / len_window + new_value;
-}
-
 /**
  * damon_update_region_access_rate() - Update the access rate of a region.
  * @r:		The DAMON region to update for its access check result.
--- a/mm/damon/tests/core-kunit.h~mm-damon-core-remove-damon_moving_sum-and-its-unit-test
+++ a/mm/damon/tests/core-kunit.h
@@ -659,21 +659,6 @@ static void damon_test_set_attrs(struct
 	damon_destroy_ctx(c);
 }
 
-static void damon_test_moving_sum(struct kunit *test)
-{
-	unsigned int mvsum = 50000, nomvsum = 50000, len_window = 10;
-	unsigned int new_values[] = {10000, 0, 10000, 0, 0, 0, 10000, 0, 0, 0};
-	unsigned int expects[] = {55000, 50000, 55000, 50000, 45000, 40000,
-		45000, 40000, 35000, 30000};
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(new_values); i++) {
-		mvsum = damon_moving_sum(mvsum, nomvsum, len_window,
-				new_values[i]);
-		KUNIT_EXPECT_EQ(test, mvsum, expects[i]);
-	}
-}
-
 static void damon_test_mvsum(struct kunit *test)
 {
 	unsigned long input_expects[] = {
@@ -1590,7 +1575,6 @@ static struct kunit_case damon_test_case
 	KUNIT_CASE(damon_test_nr_accesses_to_accesses_bp),
 	KUNIT_CASE(damon_test_update_monitoring_result),
 	KUNIT_CASE(damon_test_set_attrs),
-	KUNIT_CASE(damon_test_moving_sum),
 	KUNIT_CASE(damon_test_mvsum),
 	KUNIT_CASE(damos_test_new_filter),
 	KUNIT_CASE(damos_test_commit_quota_goal),
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-adjust-isolated-pages-stat-for-damos_migrate_hotcold.patch
mm-damon-core-stop-ctxs-in-damon_start-before-returning-an-error.patch
samples-damon-mtier-do-not-stop-first-context-for-damon_start-failure.patch
mm-damon-core-make-damon_stop-never-fails.patch
mm-damon-sysfs-ignore-damon_stop-return-value.patch
mm-damon-reclaaim-ignore-damon_stop-return-value.patch
mm-damon-lru_sort-ignore-damon_stop-return-value.patch
mm-damon-core-change-damon_stop-return-type-to-void.patch
samples-damon-mtier-stop-all-contexts-with-single-damon_stop-call.patch
mm-damon-core-wait-ctx-stop-in-damon_call-before-reruning-an-error.patch
samples-damon-wsse-do-not-stop-ctx-for-damon_call-failure.patch
samples-damon-prcl-do-not-stop-damon-for-damon_call-failure.patch
mm-damon-core-remove-comment-and-test-for-nr_to_bp-divide-by-zero.patch
mm-damon-core-s-damon_max_nr_accesses-damon_nr_samples_per_aggr.patch
mm-damon-core-s-accesses_bp_to_nr_accesses-sample_bp_to_count.patch
mm-damon-core-s-nr_accesses_to_accesses_bp-sample_count_to_bp.patch
mm-damon-core-s-nr_accesses_for_new_attrs-nr_samples_for_new_attrs.patch
mm-damon-core-update-probe-hits-for-new-parameter-commit.patch
mm-damon-core-handle-unreset-probe_hits-in-probe_hits_mvsum.patch
mm-damon-core-introduce-damon_probe-weight.patch
mm-damon-core-ask-apply_probes-ops-callback-to-set-sampling-address.patch
mm-damon-paddr-set-samples-in-apply_probes-if-requested.patch
mm-damon-core-ask-apply_probe-to-return-max-probe-hits-weighted-sum.patch
mm-damon-core-implement-damon_probe_hits_wsum.patch
mm-damon-paddr-respect-return_max_wsum.patch
mm-damon-core-use-abs_diff-instead-of-abs.patch
mm-damon-core-extend-merge-function-to-work-with-probe-hits.patch
mm-damon-core-disallow-probe_hits-overflow-on-attrs-only-monitoring.patch
mm-damon-core-validate-params-for-probe-hits-weighted-sum-overflow.patch
mm-damon-core-disable-access-monitoring-when-probe-weights-are-set.patch
mm-damon-core-set-samples-in-apply_probes-if-probe-weights-are-set.patch
mm-damon-core-s-max_nr_accesses-max_merge_score-in-kdamond_fn.patch
mm-damon-core-get-merge-threshold-from-probe-hits-when-weights-are-set.patch
mm-damon-core-implement-damon_has_probe_weight.patch
mm-damon-sysfs-implement-probe-weight-file.patch
docs-mm-damon-design-document-attrs-only-monitoring.patch
docs-admin-guide-mm-damon-usage-document-weight-sysfs-file.patch
docs-abi-damon-document-probe-weight-file.patch
mm-damon-core-skip-aging-from-repeated-aggressive-merging.patch
mm-damon-core-hide-private-damon_region-fields.patch
mm-damon-core-hide-private-damon_target-fields.patch
mm-damon-core-hide-private-damos_quota_goal-fields.patch
mm-damon-core-hide-private-damos_quota-fields.patch
mm-damon-core-hide-private-damos_filter-fields.patch
mm-damon-core-hide-private-damos-fields.patch
mm-damon-core-hide-private-damon_filter-fields.patch
mm-damon-core-hide-private-damon_probe-fields.patch
mm-damon-sysfs-do-not-directly-access-damon_ctx-ops.patch
mm-damon-core-hide-core-private-damon_ctx-fields.patch
mm-damon-core-avoid-infinite-kdamond_merge_regions-internal-loop.patch
mm-damon-tests-core-kunit-catch-test-failure-in-test_merge_regions_of.patch
mm-damon-vaddr-drop-last-same-folio-access-check-optimization.patch
mm-damon-paddr-drop-last-same-folio-access-check-reuse-optimization.patch
mm-damon-sysfs-read-addr_unit-only-once-in-damon_sysfs_apply_inputs.patch
mm-damon-sysfs-read-ops_id-only-once-in-damon_sysfs_apply_inputs.patch
mm-damon-core-initialize-damos-last_applied.patch
mm-damon-core-kunit-check-region-count-before-testing-in-split_at.patch
mm-damon-vaddr-kunit-check-region-count-in-three_regions-test.patch
mm-damon-core-kunit-handle-region-split-failure-in-filter_out.patch
mm-damon-core-kunit-skip-wrong-dest-walk-in-commit_dests_for.patch
mm-damon-core-kunit-skip-wrong-quota-goal-walk-in-commit_quota_goals.patch
mm-damon-core-kunit-skip-wrong-region-walk-in-commit_target_regions.patch
mm-damon-ops-common-use-nr_accesses-moving-sum-for-quota-score.patch
mm-damon-core-handle-region-split-failure-in-apply_min_nr_regions.patch