selftests/damon/_damon_sysfs: read tried regions directories in order

Kdamond.update_schemes_tried_regions() reads and stores tried regions
information out of address order. It makes debugging a test failure
difficult. Change the behavior to do the reading and writing in the
address order.

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

tools/testing/selftests/damon/_damon_sysfs.py

···
                 tried_regions = []
                 tried_regions_dir = os.path.join(
                         scheme.sysfs_dir(), 'tried_regions')
+                region_indices = []
                 for filename in os.listdir(
                         os.path.join(scheme.sysfs_dir(), 'tried_regions')):
                     tried_region_dir = os.path.join(tried_regions_dir, filename)
                     if not os.path.isdir(tried_region_dir):
                         continue
+                    region_indices.append(int(filename))
+                for region_idx in sorted(region_indices):
+                    tried_region_dir = os.path.join(tried_regions_dir,
+                                                    '%d' % region_idx)
                     region_values = []
                     for f in ['start', 'end', 'nr_accesses', 'age']:
                         content, err = read_file(