+ mm-damon-sysfs-schemes-implement-probe-dir.patch added to mm-new branch

+ mm-damon-sysfs-schemes-implement-probe-dir.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs-schemes: implement probe dir
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-sysfs-schemes-implement-probe-dir.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-probe-dir.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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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and is updated there most days

------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs-schemes: implement probe dir
Date: Mon, 18 May 2026 16:41:04 -0700

Implement sysfs directory for showing per-probe hits count of each region.

Link: https://lore.kernel.org/20260518234119.97569-17-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.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: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs-schemes.c |  101 ++++++++++++++++++++++++++++++++++---
 1 file changed, 95 insertions(+), 6 deletions(-)

--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-implement-probe-dir
+++ a/mm/damon/sysfs-schemes.c
@@ -11,11 +11,39 @@
 #include "sysfs-common.h"
 
 /*
+ * probe directory
+ */
+
+struct damos_sysfs_probe {
+	struct kobject kobj;
+};
+
+static struct damos_sysfs_probe *damos_sysfs_probe_alloc(void)
+{
+	return kzalloc_obj(struct damos_sysfs_probe);
+}
+
+static void damos_sysfs_probe_release(struct kobject *kobj)
+{
+	struct damos_sysfs_probe *probe = container_of(kobj,
+			struct damos_sysfs_probe, kobj);
+
+	kfree(probe);
+}
+
+static const struct kobj_type damos_sysfs_probe_ktype = {
+	.release = damos_sysfs_probe_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+};
+
+/*
  * probes directory
  */
 
 struct damos_sysfs_probes {
 	struct kobject kobj;
+	struct damos_sysfs_probe **probes_arr;
+	int nr;
 };
 
 static struct damos_sysfs_probes *damos_sysfs_probes_alloc(void)
@@ -23,6 +51,60 @@ static struct damos_sysfs_probes *damos_
 	return kzalloc_obj(struct damos_sysfs_probes);
 }
 
+static void damos_sysfs_probes_rm_dirs(struct damos_sysfs_probes *probes)
+{
+	struct damos_sysfs_probe **probes_arr = probes->probes_arr;
+	int i;
+
+	for (i = 0; i < probes->nr; i++)
+		kobject_put(&probes_arr[i]->kobj);
+	probes->nr = 0;
+	kfree(probes_arr);
+	probes->probes_arr = NULL;
+}
+
+static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes,
+		struct damon_ctx *ctx)
+{
+	struct damon_probe *probe;
+	struct damos_sysfs_probe **probes_arr;
+	int i = 0;
+
+	damon_for_each_probe(probe, ctx)
+		i++;
+
+	if (!i)
+		return 0;
+
+	probes_arr = kmalloc_objs(*probes_arr, i);
+	if (!probes_arr)
+		return -ENOMEM;
+	probes->probes_arr = probes_arr;
+
+	i = 0;
+	damon_for_each_probe(probe, ctx) {
+		struct damos_sysfs_probe *sys_probe;
+		int err;
+
+		sys_probe = damos_sysfs_probe_alloc();
+		if (!sys_probe) {
+			damos_sysfs_probes_rm_dirs(probes);
+			return -ENOMEM;
+		}
+		err = kobject_init_and_add(&sys_probe->kobj,
+				&damos_sysfs_probe_ktype, &probes->kobj, "%d",
+				i);
+		if (err) {
+			kobject_put(&sys_probe->kobj);
+			damos_sysfs_probes_rm_dirs(probes);
+			return err;
+		}
+		probes_arr[i++] = sys_probe;
+		probes->nr++;
+	}
+	return 0;
+}
+
 static void damos_sysfs_probes_release(struct kobject *kobj)
 {
 	struct damos_sysfs_probes *probes = container_of(kobj,
@@ -67,7 +149,8 @@ static struct damon_sysfs_scheme_region
 }
 
 static int damos_sysfs_region_add_dirs(
-		struct damon_sysfs_scheme_region *region)
+		struct damon_sysfs_scheme_region *region,
+		struct damon_ctx *ctx)
 {
 	struct damos_sysfs_probes *probes = damos_sysfs_probes_alloc();
 	int err;
@@ -76,18 +159,24 @@ static int damos_sysfs_region_add_dirs(
 		return -ENOMEM;
 	err = kobject_init_and_add(&probes->kobj, &damos_sysfs_probes_ktype,
 			&region->kobj, "probes");
-	if (err) {
-		kobject_put(&probes->kobj);
-		return err;
-	}
+	if (err)
+		goto fail;
+	err = damos_sysfs_probes_add_dirs(probes, ctx);
+	if (err)
+		goto fail;
 
 	region->probes = probes;
 	return 0;
+
+fail:
+	kobject_put(&probes->kobj);
+	return err;
 }
 
 static void damos_sysfs_region_rm_dirs(
 		struct damon_sysfs_scheme_region *region)
 {
+	damos_sysfs_probes_rm_dirs(region->probes);
 	kobject_put(&region->probes->kobj);
 }
 
@@ -3054,7 +3143,7 @@ void damos_sysfs_populate_region_dir(str
 				&sysfs_regions->kobj, "%d",
 				sysfs_regions->nr_regions))
 		goto out;
-	if (damos_sysfs_region_add_dirs(region))
+	if (damos_sysfs_region_add_dirs(region, ctx))
 		goto out;
 
 	list_add_tail(&region->list, &sysfs_regions->regions_list);
_

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

mm-damon-sysfs-schemes-delete-tried-region-in-regions_rmdirs.patch
mm-damon-core-make-charge_addr_from-aware-of-end-address-exclusivity.patch
mm-damon-core-handle-min_region_sz-remaining-quota-as-empty.patch
mm-damon-core-merge-regions-after-applying-damos-schemes.patch
mm-damon-core-introduce-failed-region-quota-charge-ratio.patch
mm-damon-sysfs-schemes-implement-fail_charge_numdenom-files.patch
docs-mm-damon-design-document-fail_charge_numdenom.patch
docs-admin-guide-mm-damon-usage-document-fail_charge_numdenom-files.patch
docs-abi-damon-document-fail_charge_numdenom.patch
mm-damon-tests-core-kunit-test-fail_charge_numdenom-committing.patch
selftests-damon-_damon_sysfs-support-failed-region-quota-charge-ratio.patch
selftests-damon-drgn_dump_damon_status-support-failed-region-quota-charge-ratio.patch
selftests-damon-sysfspy-test-failed-region-quota-charge-ratio.patch
docs-mm-damon-maintainer-profile-add-ai-review-usage-guideline.patch
mm-damon-core-introduce-damon_ctx-paused.patch
mm-damon-sysfs-add-pause-file-under-context-dir.patch
docs-mm-damon-design-update-for-context-pause-resume-feature.patch
docs-admin-guide-mm-damon-usage-update-for-pause-file.patch
docs-abi-damon-update-for-pause-sysfs-file.patch
mm-damon-tests-core-kunit-test-pause-commitment.patch
selftests-damon-_damon_sysfs-support-pause-file-staging.patch
selftests-damon-drgn_dump_damon_status-dump-pause.patch
selftests-damon-sysfspy-check-pause-on-assert_ctx_committed.patch
selftests-damon-sysfspy-pause-damon-before-dumping-status.patch
mm-damon-introduce-damon_set_region_system_rams_default.patch
mm-damon-reclaim-cover-all-system-rams.patch
mm-damon-lru_sort-cover-all-system-rams.patch
mm-damon-core-remove-damon_set_region_biggest_system_ram_default.patch
mm-damon-stat-use-damon_set_region_system_rams_default.patch
docs-admin-guide-mm-damon-reclaim-update-for-entire-memory-monitoring.patch
docs-admin-guide-mm-damon-lru_sort-update-for-entire-memory-monitoring.patch
docs-admin-guide-mm-damon-usage-mark-scheme-filters-sysfs-dir-as-deprecated.patch
docs-abi-damon-mark-schemes-s-filters-deprecated.patch
mm-damon-reclaim-add-autotune_monitoring_intervals-parameter.patch
docs-admin-guide-mm-damon-reclaim-update-for-autotune_monitoring_intervals.patch
mm-damon-stat-add-a-parameter-for-reading-kdamond-pid.patch
docs-admin-guide-mm-damon-stat-document-kdamond_pid-parameter.patch
mm-damon-core-introduce-struct-damon_probe.patch
mm-damon-core-embed-damon_probe-objects-in-damon_ctx.patch
mm-damon-core-introduce-damon_filter.patch
mm-damon-core-commit-probes.patch
mm-damon-core-introduce-damon_region-probe_hits.patch
mm-damon-core-introduce-damon_ops-apply_probes.patch
mm-damon-core-do-data-attributes-monitoring.patch
mm-damon-paddr-support-data-attributes-monitoring.patch
mm-damon-sysfs-implement-probes-dir.patch
mm-damon-sysfs-implement-probe-dir.patch
mm-damon-sysfs-implement-filters-directory.patch
mm-damon-sysfs-implement-filter-dir.patch
mm-damon-sysfs-implement-filter-dir-files.patch
mm-damon-sysfs-setup-probes-on-damon-core-api-parameters.patch
mm-damon-sysfs-schemes-implement-tried_regions-r-probes.patch
mm-damon-sysfs-schemes-implement-probe-dir.patch
mm-damon-sysfs-schemes-implement-probe-hits-file.patch
mm-damon-trace-probe_hits.patch
selftests-damon-sysfssh-test-probes-dir.patch
docs-mm-damon-design-document-data-attributes-monitoring.patch
docs-admin-guide-mm-damon-usage-document-data-attributes-monitoring.patch
mm-damon-core-introduce-damon_filter_type_memcg.patch
mm-damon-paddr-support-damon_filter_type_memcg.patch
mm-damon-sysfs-add-filters-f-path-file.patch
mm-damon-sysfs-schemes-move-memcg_path_to_id-to-sysfs-common.patch
mm-damon-sysfs-setup-damon_filter-memcg_id-from-path.patch
docs-mm-damon-design-update-for-memcg-damon-filter.patch
docs-admin-guide-mm-damon-usage-update-for-memcg-damon-filter.patch