selftests/damon: classify tests for functionalities and regressions

DAMON selftests can be classified into two categories: functionalities and
regressions.  Functionality tests are for checking if the function is
working as specified, while the regression tests are basically reproducers
of previously reported and fixed bugs.  The tests of the categories are
mixed in the selftests Makefile.  Separate those for easier understanding
of the types of tests.

Link: https://lkml.kernel.org/r/20240503180318.72798-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: sjp38

tools/testing/selftests/damon/Makefile

@@ -7,16 +7,21 @@ TEST_GEN_FILES += debugfs_target_ids_pid_leak
 TEST_GEN_FILES += access_memory
 
 TEST_FILES = _chk_dependency.sh _debugfs_common.sh
+
+# functionality tests
 TEST_PROGS = debugfs_attrs.sh debugfs_schemes.sh debugfs_target_ids.sh
+TEST_PROGS += sysfs.sh
+TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py
+TEST_PROGS += damos_quota.py damos_quota_goal.py damos_apply_interval.py
+TEST_PROGS += reclaim.sh lru_sort.sh
+
+# regression tests (reproducers of previously found bugs)
 TEST_PROGS += debugfs_empty_targets.sh debugfs_huge_count_read_write.sh
 TEST_PROGS += debugfs_duplicate_context_creation.sh
 TEST_PROGS += debugfs_rm_non_contexts.sh
 TEST_PROGS += debugfs_target_ids_read_before_terminate_race.sh
 TEST_PROGS += debugfs_target_ids_pid_leak.sh
-TEST_PROGS += sysfs.sh sysfs_update_removed_scheme_dir.sh
+TEST_PROGS += sysfs_update_removed_scheme_dir.sh
 TEST_PROGS += sysfs_update_schemes_tried_regions_hang.py
-TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py
-TEST_PROGS += damos_quota.py damos_quota_goal.py damos_apply_interval.py
-TEST_PROGS += reclaim.sh lru_sort.sh
 
 include ../lib.mk