[merged mm-stable] mm-damon-core-introduce-damon_prep-struct.patch removed from -mm tree

[merged mm-stable] mm-damon-core-introduce-damon_prep-struct.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/core: introduce damon_prep struct
has been removed from the -mm tree.  Its filename was
     mm-damon-core-introduce-damon_prep-struct.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: introduce damon_prep struct
Date: Tue, 1 Sep 2026 06:24:52 -0700

Some DAMON probe filter types require preparatory actions.  For example,
pgilde_unset probe filter can say if the page was accessed but when.  To
answer the second question, the PG_Idle flag should be set at a specific
time.  It can make life much easier if DAMON can do such preparatory
actions.  Introduce a new data type called damon_prep.  It specifies each
of the preparation actions for each probe.  DAMON will execute the action
for each region per sampling interval, like it clears page table accessed
bits and unsets PG_Idle flag for access monitoring.

Also introduce DAMON_PREP_SET_PGIDLE as the initial prep action.  As the
name says, it will do exactly what DAMON was doing as the preparation
action for the access monitoring.

Link: https://lore.kernel.org/20260901132506.99243-6-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
---

 include/linux/damon.h |   32 ++++++++++++++++++++++++++++++++
 mm/damon/core.c       |   26 ++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

--- a/include/linux/damon.h~mm-damon-core-introduce-damon_prep-struct
+++ a/include/linux/damon.h
@@ -743,6 +743,27 @@ struct damon_intervals_goal {
 };
 
 /**
+ * enum damon_prep_action - DAMON probing preparation action.
+ *
+ * @DAMON_PREP_SET_PGIDLE:	Set the probing memory as idle page.
+ */
+enum damon_prep_action {
+	DAMON_PREP_SET_PGIDLE,
+};
+
+/**
+ * struct damon_prep - DAMON probing preparation request.
+ *
+ * @action:	Action to do to the probing memory for the preparation.
+ */
+struct damon_prep {
+	enum damon_prep_action action;
+/* private: */
+	/* siblings list. */
+	struct list_head list;
+};
+
+/**
  * enum damon_filter_type - Type of &struct damon_filter
  *
  * @DAMON_FILTER_TYPE_ANON:		Anonymous pages.
@@ -783,6 +804,8 @@ struct damon_filter {
 struct damon_probe {
 	unsigned int weight;
 /* private: */
+	/* Preparation actions to apply to each probing memory. */
+	struct list_head preps;
 	/* Filters for assessing if a given region is for this probe. */
 	struct list_head filters;
 	/* Siblings list. */
@@ -962,6 +985,12 @@ static inline unsigned long damon_sz_reg
 	return r->ar.end - r->ar.start;
 }
 
+#define damon_for_each_prep(p, probe) \
+	list_for_each_entry(p, &(probe)->preps, list)
+
+#define damon_for_each_prep_safe(p, next, probe) \
+	list_for_each_entry_safe(p, next, &(probe)->preps, list)
+
 #define damon_for_each_filter(f, p) \
 	list_for_each_entry(f, &(p)->filters, list)
 
@@ -1015,6 +1044,9 @@ static inline unsigned long damon_sz_reg
 
 #ifdef CONFIG_DAMON
 
+struct damon_prep *damon_new_prep(enum damon_prep_action action);
+void damon_add_prep(struct damon_probe *p, struct damon_prep *prep);
+
 struct damon_filter *damon_new_filter(enum damon_filter_type type,
 		bool matching, bool allow);
 void damon_add_filter(struct damon_probe *probe, struct damon_filter *f);
--- a/mm/damon/core.c~mm-damon-core-introduce-damon_prep-struct
+++ a/mm/damon/core.c
@@ -112,6 +112,28 @@ int damon_select_ops(struct damon_ctx *c
 	return err;
 }
 
+struct damon_prep *damon_new_prep(enum damon_prep_action action)
+{
+	struct damon_prep *prep;
+
+	prep = kmalloc_obj(*prep);
+	if (!prep)
+		return NULL;
+	prep->action = action;
+	INIT_LIST_HEAD(&prep->list);
+	return prep;
+}
+
+void damon_add_prep(struct damon_probe *p, struct damon_prep *prep)
+{
+	list_add_tail(&prep->list, &p->preps);
+}
+
+static void damon_free_prep(struct damon_prep *p)
+{
+	kfree(p);
+}
+
 struct damon_filter *damon_new_filter(enum damon_filter_type type,
 		bool matching, bool allow)
 {
@@ -168,6 +190,7 @@ struct damon_probe *damon_new_probe(void
 	if (!p)
 		return NULL;
 	p->weight = 0;
+	INIT_LIST_HEAD(&p->preps);
 	INIT_LIST_HEAD(&p->filters);
 	INIT_LIST_HEAD(&p->list);
 	return p;
@@ -185,8 +208,11 @@ static void damon_del_probe(struct damon
 
 static void damon_free_probe(struct damon_probe *p)
 {
+	struct damon_prep *prep, *prep_next;
 	struct damon_filter *f, *next;
 
+	damon_for_each_prep_safe(prep, prep_next, p)
+		damon_free_prep(prep);
 	damon_for_each_filter_safe(f, next, p)
 		damon_free_filter(f);
 	kfree(p);
_

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

mm-damon-core-use-damon_nr_samples_per_aggr-for-max-merge-threshold.patch
mm-damon-core-remove-debug-messages.patch
mm-damon-core-remove-debug-messages-fix.patch
mm-damon-vaddr-remove-a-debug-message.patch
mm-damon-core-validate-number-of-probes-in-valid_probe_params.patch
mm-damon-sysfs-remove-probes-number-validation.patch
mm-damon-tests-core-kunit-extend-set_regions-test-for-error-case.patch
mm-damon-tests-core-kunit-test-=0-size-damon_set_regions-inputs.patch
mm-damon-tests-core-kunit-test-overlapping-ranges-for-set_regions.patch
mm-damon-tests-core-kunit-test-damon_nr_samples_per_aggr.patch
selftests-damon-sysfssh-test-hugepage_mem_bp-quota-goal.patch
docs-mm-damon-maintainer-profile-update-ai-review-for-sashiko-replies.patch
docs-abi-damon-recommend-subsystem-doc-instead-of-admin-guide.patch
mm-damon-core-error-damos_commit_quota_goal-for-zero-target_value.patch
revert-mm-damon-lru_sort-error-out-for-10000-active_mem_bp.patch
revert-samples-damon-mtier-error-out-for-zero-quota-goal-target-values.patch
mm-damon-core-handle-null-ctx-parameter-in-damon_call.patch
mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch
mm-damon-reclaim-remove-unnecessary-damon_call-param-validation.patch
mm-damon-lru_sort-remove-unnecessary-damon_call-param-validation.patch
mm-damon-vaddr-support-prep_probes.patch
mm-damon-paddr-move-probe-filter-handling-to-ops-common.patch
mm-damon-vaddr-support-apply_probe.patch
mm-damon-vaddr-extend-apply_probes-for-hugetlb.patch
mm-damon-vaddr-support-pgidle_unset-probe-filter-type.patch
mm-damon-api-introduce-damon_filter_type_pgidle_set.patch
mm-damon-paddr-support-damon_filter_type_pgidle_set.patch
mm-damon-vaddr-support-damon_filter_type_pgidle_set.patch
mm-damon-sysfs-support-damon_filter_type_pgidle_set.patch
docs-mm-damon-design-update-for-pgidle_set-probe-filter.patch
mm-damon-api-introduce-damos_filter_type_probe_hits_wsum.patch
mm-damon-api-introduce-damos_filter_type_probe_hits_wsum-fix.patch
mm-damon-core-extend-probe_hits_wsum-for-moving-sum-based-calculation.patch
mm-damon-core-support-probe_hits_wsum-damos-core-filter.patch
mm-damon-sysfs-schemes-rename-sysfs_filter-sz_range-to-range_minmax.patch
mm-damon-sysfs-schemes-support-probe_hits_wsum-damos-core-filter.patch
docs-mm-damon-design-update-for-probe_hits_wsum-damos-core-filter.patch
docs-admin-guide-mm-damon-usage-update-for-probe_hits_wsum-damos-filter.patch
mm-damon-sysfs-schemes-read-sysfs_filter-addr_range-only-once.patch
mm-damon-sysfs-schemes-read-sysfs_filter-sz_range-only-once.patch
mm-damon-core-return-an-error-from-damos_commit_filter_arg.patch
mm-damon-core-disallow-max-min-damos-filter-range-arguments-commit.patch
mm-damon-sysfs-schemes-drop-centralized-filter-range-arg-validations.patch
mm-damon-sysfs-schemes-use-switch-case-in-add_scheme_filters.patch
mm-damon-core-kunit-extend-damos_commit_filter_for-for-wrong-input.patch
mm-damon-core-kunit-test-invalid-damos-filter-commits.patch
mm-damon-api-introduce-damon_filter_type_hugepage_size.patch
mm-damon-core-commit-hugepage_size-type-damon-filter.patch
mm-damon-ops-common-support-hugepage_size-damon-filter-matching.patch
mm-damon-sysfs-add-minmax-files-under-probe-filter-directory.patch
mm-damon-sysfs-support-hugepage_size-probe-filter.patch
docs-mm-damon-design-update-for-hugepage_size-probe-filter.patch
docs-admin-guide-mm-damon-usage-update-for-hugepage_size.patch
docs-abi-damon-update-for-hugepage_size-probe-filter.patch
mm-damon-api-remove-nr_damos_filter_types.patch
mm-damon-core-use-abs_diff-in-damon_feed_loop_next_input.patch
mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.patch
mm-damon-core-set-damon_ctx-walk_control_obsolete-in-damon_new_ctx.patch
mm-damon-core-document-damon_call-damon_start-race-hang-issue.patch
mm-damon-paddr-remove-pa-parameter-from-damon_pa_filter_pass.patch
mm-damon-tests-core-kunit-test-eligible_mem_bp-commitment.patch
mm-damon-tests-core-kunit-add-probe_hits_wsum-damos-filter-commit-test.patch
selftests-damon-sysfs_memcg_path_leak-fail-only-for-real-damon-leak.patch
docs-mm-damon-design-clarify-bp-is-basis-point.patch
mm-damon-core-introduce-damos_quota_goal-complement.patch
mm-damon-core-add-complement-argument-to-damos_new_quota_goal.patch
mm-damon-sysfs-schemes-support-quota-goal-complement-flag.patch
mm-damon-tests-core-kunit-test-quota_goal-complement-commit.patch
selftests-damon-sysfssh-test-quota-goal-complement-flag-file.patch
docs-mm-damon-design-document-damos-quota-goal-complement-flag.patch
docs-admin-guide-mm-damon-usage-update-for-quota-goal-complement-file.patch
docs-abi-damon-update-for-quota-goal-metric-complement-sysfs-file.patch