+ mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch added to mm-unstable branch

+ mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/core-test: test damon_split_region_at()'s access rate copying
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch

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

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/core-test: test damon_split_region_at()'s access rate copying
Date: Sun, 19 Nov 2023 17:15:29 +0000

damon_split_region_at() should set access rate related fields of the
resulting regions same.  It may forgotten, and actually there was the
mistake before.  Test it with the unit test case for the function.

Link: https://lkml.kernel.org/r/20231119171529.66863-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core-test.h |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/mm/damon/core-test.h~mm-damon-core-test-test-damon_split_region_ats-access-rate-copying
+++ a/mm/damon/core-test.h
@@ -122,18 +122,25 @@ static void damon_test_split_at(struct k
 {
 	struct damon_ctx *c = damon_new_ctx();
 	struct damon_target *t;
-	struct damon_region *r;
+	struct damon_region *r, *r_new;
 
 	t = damon_new_target();
 	r = damon_new_region(0, 100);
+	r->nr_accesses_bp = 420000;
+	r->nr_accesses = 42;
+	r->last_nr_accesses = 15;
 	damon_add_region(r, t);
 	damon_split_region_at(t, r, 25);
 	KUNIT_EXPECT_EQ(test, r->ar.start, 0ul);
 	KUNIT_EXPECT_EQ(test, r->ar.end, 25ul);
 
-	r = damon_next_region(r);
-	KUNIT_EXPECT_EQ(test, r->ar.start, 25ul);
-	KUNIT_EXPECT_EQ(test, r->ar.end, 100ul);
+	r_new = damon_next_region(r);
+	KUNIT_EXPECT_EQ(test, r_new->ar.start, 25ul);
+	KUNIT_EXPECT_EQ(test, r_new->ar.end, 100ul);
+
+	KUNIT_EXPECT_EQ(test, r->nr_accesses_bp, r_new->nr_accesses_bp);
+	KUNIT_EXPECT_EQ(test, r->nr_accesses, r_new->nr_accesses);
+	KUNIT_EXPECT_EQ(test, r->last_nr_accesses, r_new->last_nr_accesses);
 
 	damon_free_target(t);
 	damon_destroy_ctx(c);
_

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

mm-damon-core-copy-nr_accesses-when-splitting-region.patch
mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch