mm-damon-core-copy-nr_accesses-when-splitting-region.patch removed from -mm tree

The quilt patch titled
Subject: mm/damon/core: copy nr_accesses when splitting region
has been removed from the -mm tree. Its filename was
mm-damon-core-copy-nr_accesses-when-splitting-region.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <[email protected]>
Subject: mm/damon/core: copy nr_accesses when splitting region
Date: Sun, 19 Nov 2023 17:15:28 +0000

Regions split function ('damon_split_region_at()') is called at the beginning of an aggregation interval, and when DAMOS applying the actions and charging quota. Because 'nr_accesses' fields of all regions are reset at the beginning of each aggregation interval, and DAMOS was applying the action at the end of each aggregation interval, there was no need to copy the 'nr_accesses' field to the split-out region.

However, commit 42f994b71404 ("mm/damon/core: implement scheme-specific apply interval") made DAMOS applies action on its own timing interval. Hence, 'nr_accesses' should also copied to split-out regions, but the commit didn't. Fix it by copying it.

---

 mm/damon/core.c |    1 +
 1 file changed, 1 insertion(+)

@@ -1225,6 +1225,7 @@ static void damon_split_region_at(struct
 	new->age = r->age;
 	new->last_nr_accesses = r->last_nr_accesses;
 	new->nr_accesses_bp = r->nr_accesses_bp;
+	new->nr_accesses = r->nr_accesses;
 
 	damon_insert_region(new, r, damon_next_region(r), t);
 }

_

Patches currently in -mm which might be from [email protected] are

mm-damon-core-test-test-damon_split_region_ats-access-rate-copying.patch mm-damon-core-implement-goal-oriented-feedback-driven-quota-auto-tuning.patch mm-damon-core-implement-goal-oriented-feedback-driven-quota-auto-tuning-fix.patch mm-damon-sysfs-schemes-implement-files-for-scheme-quota-goals-setup.patch mm-damon-sysfs-schemes-commit-damos-quota-goals-user-input-to-damos.patch mm-damon-sysfs-schemes-implement-a-command-for-scheme-quota-goals-only-commit.patch mm-damon-core-test-add-a-unit-test-for-the-feedback-loop-algorithm.patch selftests-damon-test-quota-goals-directory.patch docs-mm-damon-design-document-damos-quota-auto-tuning.patch docs-abi-damon-document-damos-quota-goals.patch docs-admin-guide-mm-damon-usage-document-for-quota-goals.patch