tools/selftets/damon/sysfs: test tried_regions directory existence

Add a simple test case for ensuring tried_regions directory existence.

Link: https://lkml.kernel.org/r/20221101220328.95765-7-sj@kernel.orgSigned-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>

tools/testing/selftests/damon/sysfs.sh

@@ -80,6 +80,12 @@ test_range()
 	ensure_file "$range_dir/max" "exist" 600
 }
 
+test_tried_regions()
+{
+	tried_regions_dir=$1
+	ensure_dir "$tried_regions_dir" "exist"
+}
+
 test_stats()
 {
 	stats_dir=$1
@@ -138,6 +144,7 @@ test_scheme()
 	test_quotas "$scheme_dir/quotas"
 	test_watermarks "$scheme_dir/watermarks"
 	test_stats "$scheme_dir/stats"
+	test_tried_regions "$scheme_dir/tried_regions"
 }
 
 test_schemes()