[folded-merged] samples-damon-implement-a-damon-module-for-memory-tiering-fix.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: samples/damon/mtier: fix wrong DAMON attrs setting
has been removed from the -mm tree.  Its filename was
     samples-damon-implement-a-damon-module-for-memory-tiering-fix.patch

This patch was dropped because it was folded into samples-damon-implement-a-damon-module-for-memory-tiering.patch

------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: samples/damon/mtier: fix wrong DAMON attrs setting
Date: Sat, 10 May 2025 15:09:32 -0700

When intervals auto-tuning is enabled, DAMON monitoring attributes should
be set with damon_set_attrs().  Because damon_set_attrs() is the only
place that sets attrs->aggr_samples, not calling damon_set_attrs() can
result in divide-by-zero from damon_get_intervals_score().

mtier, which is a DAMON's sample module that merged in mm-unstable as of
this writing, is not calling the function while enabling the auto-tuning. 
Fix the problem by properly calling damon_set_attrs().

Link: https://lkml.kernel.org/r/20250510220932.47722-1-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 samples/damon/mtier.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--- a/samples/damon/mtier.c~samples-damon-implement-a-damon-module-for-memory-tiering-fix
+++ a/samples/damon/mtier.c
@@ -41,6 +41,7 @@ static struct damon_ctx *ctxs[2];
 static struct damon_ctx *damon_sample_mtier_build_ctx(bool promote)
 {
 	struct damon_ctx *ctx;
+	struct damon_attrs attrs;
 	struct damon_target *target;
 	struct damon_region *region;
 	struct damos *scheme;
@@ -50,14 +51,24 @@ static struct damon_ctx *damon_sample_mt
 	ctx = damon_new_ctx();
 	if (!ctx)
 		return NULL;
+	attrs = (struct damon_attrs) {
+		.sample_interval = 5 * USEC_PER_MSEC,
+		.aggr_interval = 100 * USEC_PER_MSEC,
+		.ops_update_interval = 60 * USEC_PER_MSEC * MSEC_PER_SEC,
+		.min_nr_regions = 10,
+		.max_nr_regions = 1000,
+	};
+
 	/*
 	 * auto-tune sampling and aggregation interval aiming 4% DAMON-observed
 	 * accesses ratio, keeping sampling interval in [5ms, 10s] range.
 	 */
-	ctx->attrs.intervals_goal = (struct damon_intervals_goal) {
+	attrs.intervals_goal = (struct damon_intervals_goal) {
 		.access_bp = 400, .aggrs = 3,
 		.min_sample_us = 5000, .max_sample_us = 10000000,
 	};
+	if (damon_set_attrs(ctx, &attrs))
+		goto free_out;
 	if (damon_select_ops(ctx, DAMON_OPS_PADDR))
 		goto free_out;
 
_

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

mm-damon-core-introduce-damos-quota-goal-metrics-for-memory-node-utilization.patch
mm-damon-sysfs-schemes-implement-file-for-quota-goal-nid-parameter.patch
mm-damon-sysfs-schemes-connect-damos_quota_goal-nid-with-core-layer.patch
docs-mm-damon-design-document-node_mem_usedfree_bp.patch
docs-admin-guide-mm-damon-usage-document-nid-file.patch
docs-abi-damon-document-nid-file.patch
samples-damon-implement-a-damon-module-for-memory-tiering.patch
mm-damon-core-warn-and-fix-nr_accesses-corruption.patch
mm-damon-sysfs-schemes-fix-wrong-comment-on-damons_sysfs_quota_goal_metric_strs.patch
mm-damon-paddr-remove-unused-variable-folio_list-in-damon_pa_stat.patch
mm-damon-tests-core-kunit-add-a-test-for-damos_set_filters_default_reject.patch
selftests-damon-_damon_sysfs-read-tried-regions-directories-in-order.patch
docs-damon-update-titles-and-brief-introductions-to-explain-damos.patch