selftests/damon/drgn_dump_damon_status: dump damos->migrate_dests

drgn_dump_damon_status.py is a script for dumping DAMON internal status in
json format. It is being used for seeing if DAMON parameters that are set
using _damon_sysfs.py are actually passed to DAMON in the kernel space.
It is, however, not dumping full DAMON internal status, and it makes
increasing test coverage difficult. Add damos->migrate_dests dumping for
more tests.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: SeongJae Park <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/selftests/damon/drgn_dump_damon_status.py

···
         ['high', int], ['mid', int], ['low', int],
         ])
 
+def damos_migrate_dests_to_dict(dests):
+    nr_dests = int(dests.nr_dests)
+    node_id_arr = []
+    weight_arr = []
+    for i in range(nr_dests):
+        node_id_arr.append(int(dests.node_id_arr[i]))
+        weight_arr.append(int(dests.weight_arr[i]))
+    return {
+            'node_id_arr': node_id_arr,
+            'weight_arr': weight_arr,
+            'nr_dests': nr_dests,
+            }
+
 def scheme_to_dict(scheme):
     return to_dict(scheme, [
         ['pattern', damos_access_pattern_to_dict],
···
         ['quota', damos_quota_to_dict],
         ['wmarks', damos_watermarks_to_dict],
         ['target_nid', int],
+        ['migrate_dests', damos_migrate_dests_to_dict],
         ])
 
 def schemes_to_list(schemes):