+ mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file.patch added to mm-new branch

+ mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs-schemes: implement quotas->goal_tuner file
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs-schemes: implement quotas->goal_tuner file
Date: Mon, 9 Mar 2026 18:05:20 -0700

Add a new DAMON sysfs interface file, namely 'goal_tuner' under the DAMOS
quotas directory.  It is connected to the damos_quota->goal_tuner field. 
Users can therefore select their favorite goal-based quotas tuning
algorithm by writing the name of the tuner to the file.  Reading the file
returns the name of the currently selected tuner.

Link: https://lkml.kernel.org/r/20260310010529.91162-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs-schemes.c |   58 +++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file
+++ a/mm/damon/sysfs-schemes.c
@@ -1488,6 +1488,7 @@ struct damon_sysfs_quotas {
 	unsigned long sz;
 	unsigned long reset_interval_ms;
 	unsigned long effective_sz;	/* Effective size quota in bytes */
+	enum damos_quota_goal_tuner goal_tuner;
 };
 
 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)
@@ -1610,6 +1611,58 @@ static ssize_t effective_bytes_show(stru
 	return sysfs_emit(buf, "%lu\n", quotas->effective_sz);
 }
 
+struct damos_sysfs_qgoal_tuner_name {
+	enum damos_quota_goal_tuner tuner;
+	char *name;
+};
+
+static struct damos_sysfs_qgoal_tuner_name damos_sysfs_qgoal_tuner_names[] = {
+	{
+		.tuner = DAMOS_QUOTA_GOAL_TUNER_CONSIST,
+		.name = "consist",
+	},
+	{
+		.tuner = DAMOS_QUOTA_GOAL_TUNER_TEMPORAL,
+		.name = "temporal",
+	},
+};
+
+static ssize_t goal_tuner_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(damos_sysfs_qgoal_tuner_names); i++) {
+		struct damos_sysfs_qgoal_tuner_name *tuner_name;
+
+		tuner_name = &damos_sysfs_qgoal_tuner_names[i];
+		if (tuner_name->tuner == quotas->goal_tuner)
+			return sysfs_emit(buf, "%s\n", tuner_name->name);
+	}
+	return -EINVAL;
+}
+
+static ssize_t goal_tuner_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(damos_sysfs_qgoal_tuner_names); i++) {
+		struct damos_sysfs_qgoal_tuner_name *tuner_name;
+
+		tuner_name = &damos_sysfs_qgoal_tuner_names[i];
+		if (sysfs_streq(buf, tuner_name->name)) {
+			quotas->goal_tuner = tuner_name->tuner;
+			return count;
+		}
+	}
+	return -EINVAL;
+}
+
 static void damon_sysfs_quotas_release(struct kobject *kobj)
 {
 	kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));
@@ -1627,11 +1680,15 @@ static struct kobj_attribute damon_sysfs
 static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr =
 		__ATTR_RO_MODE(effective_bytes, 0400);
 
+static struct kobj_attribute damon_sysfs_quotas_goal_tuner_attr =
+		__ATTR_RW_MODE(goal_tuner, 0600);
+
 static struct attribute *damon_sysfs_quotas_attrs[] = {
 	&damon_sysfs_quotas_ms_attr.attr,
 	&damon_sysfs_quotas_sz_attr.attr,
 	&damon_sysfs_quotas_reset_interval_ms_attr.attr,
 	&damon_sysfs_quotas_effective_bytes_attr.attr,
+	&damon_sysfs_quotas_goal_tuner_attr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(damon_sysfs_quotas);
@@ -2718,6 +2775,7 @@ static struct damos *damon_sysfs_mk_sche
 		.weight_sz = sysfs_weights->sz,
 		.weight_nr_accesses = sysfs_weights->nr_accesses,
 		.weight_age = sysfs_weights->age,
+		.goal_tuner = sysfs_quotas->goal_tuner,
 	};
 	struct damos_watermarks wmarks = {
 		.metric = sysfs_wmarks->metric,
_

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

mm-damon-core-set-quota-score-histogram-with-core-filters.patch
mm-damon-core-do-non-safe-region-walk-on-kdamond_apply_schemes.patch
mm-damon-core-split-regions-for-min_nr_regions.patch
mm-damon-vaddr-do-not-split-regions-for-min_nr_regions.patch
mm-damon-test-core-kunit-add-damon_apply_min_nr_regions-test.patch
mm-damon-add-config_damon_debug_sanity.patch
mm-damon-core-add-damon_new_region-debug_sanity-check.patch
mm-damon-core-add-damon_del_region-debug_sanity-check.patch
mm-damon-core-add-damon_nr_regions-debug_sanity-check.patch
mm-damon-core-add-damon_merge_two_regions-debug_sanity-check.patch
mm-damon-core-add-damon_merge_regions_of-debug_sanity-check.patch
mm-damon-core-add-damon_split_region_at-debug_sanity-check.patch
mm-damon-core-add-damon_reset_aggregated-debug_sanity-check.patch
mm-damon-tests-kunitconifg-enable-damon_debug_sanity.patch
selftests-damon-config-enable-damon_debug_sanity.patch
mm-damon-tests-core-kunit-add-a-test-for-damon_commit_ctx.patch
docs-mm-damon-design-document-the-power-of-two-limitation-for-addr_unit.patch
mm-damon-core-remove-damos_set_next_apply_sis-duplicates.patch
mm-damon-core-use-time_before-for-next_apply_sis.patch
mm-damon-core-use-time_after_eq-in-kdamond_fn.patch
mm-damon-core-use-mult_frac.patch
mm-damon-tests-core-kunit-add-a-test-for-damon_is_last_region.patch
mm-damon-core-clarify-damon_set_attrs-usages.patch
mm-damon-document-non-zero-length-damon_region-assumption.patch
docs-admin-guide-mm-damn-lru_sort-fix-intervals-autotune-parameter-name.patch
docs-mm-damon-maintainer-profile-use-flexible-review-cadence.patch
docs-mm-damon-index-fix-typo-autoamted-automated.patch
mm-damon-core-introduce-damos_quota_goal_tuner.patch
mm-damon-core-allow-quota-goals-set-zero-effective-size-quota.patch
mm-damon-core-introduce-damos_quota_goal_tuner_temporal.patch
mm-damon-sysfs-schemes-implement-quotas-goal_tuner-file.patch
docs-mm-damon-design-document-the-goal-based-quota-tuner-selections.patch
docs-admin-guide-mm-damon-usage-document-goal_tuner-sysfs-file.patch
docs-abi-damon-update-for-goal_tuner.patch
mm-damon-tests-core-kunit-test-goal_tuner-commit.patch
selftests-damon-_damon_sysfs-support-goal_tuner-setup.patch
selftests-damon-drgn_dump_damon_status-support-quota-goal_tuner-dumping.patch
selftests-damon-sysfspy-test-goal_tuner-commit.patch