selftests/damon: add a test for DAMON sysfs interface

This commit adds a selftest for DAMON sysfs interface.  It tests the
functionality of 'nr' files and existence of files in each directory of
the hierarchy.

Link: https://lkml.kernel.org/r/20220228081314.5770-12-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/tools/testing/selftests/damon/Makefile b/tools/testing/selftests/damon/Makefile
index 937d36a..0470c5f 100644 (file)
--- a/tools/testing/selftests/damon/Makefile
+++ b/tools/testing/selftests/damon/Makefile
@@ -6,5 +6,6 @@ TEST_GEN_FILES += huge_count_read_write
 TEST_FILES = _chk_dependency.sh _debugfs_common.sh
 TEST_PROGS = debugfs_attrs.sh debugfs_schemes.sh debugfs_target_ids.sh
 TEST_PROGS += debugfs_empty_targets.sh debugfs_huge_count_read_write.sh
+TEST_PROGS += sysfs.sh
 
 include ../lib.mk

diff --git a/tools/testing/selftests/damon/sysfs.sh b/tools/testing/selftests/damon/sysfs.sh
new file mode 100644 (file)
index 0000000..2e3ae77
--- /dev/null
+++ b/tools/testing/selftests/damon/sysfs.sh
@@ -0,0 +1,306 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Kselftest frmework requirement - SKIP code is 4.
+ksft_skip=4
+
+ensure_write_succ()
+{
+       file=$1
+       content=$2
+       reason=$3
+
+       if ! echo "$content" > "$file"
+       then
+               echo "writing $content to $file failed"
+               echo "expected success because $reason"
+               exit 1
+       fi
+}
+
+ensure_write_fail()
+{
+       file=$1
+       content=$2
+       reason=$3
+
+       if echo "$content" > "$file"
+       then
+               echo "writing $content to $file succeed ($fail_reason)"
+               echo "expected failure because $reason"
+               exit 1
+       fi
+}
+
+ensure_dir()
+{
+       dir=$1
+       to_ensure=$2
+       if [ "$to_ensure" = "exist" ] && [ ! -d "$dir" ]
+       then
+               echo "$dir dir is expected but not found"
+               exit 1
+       elif [ "$to_ensure" = "not_exist" ] && [ -d "$dir" ]
+       then
+               echo "$dir dir is not expected but found"
+               exit 1
+       fi
+}
+
+ensure_file()
+{
+       file=$1
+       to_ensure=$2
+       permission=$3
+       if [ "$to_ensure" = "exist" ]
+       then
+               if [ ! -f "$file" ]
+               then
+                       echo "$file is expected but not found"
+                       exit 1
+               fi
+               perm=$(stat -c "%a" "$file")
+               if [ ! "$perm" = "$permission" ]
+               then
+                       echo "$file permission: expected $permission but $perm"
+                       exit 1
+               fi
+       elif [ "$to_ensure" = "not_exist" ] && [ -f "$dir" ]
+       then
+               echo "$file is not expected but found"
+               exit 1
+       fi
+}
+
+test_range()
+{
+       range_dir=$1
+       ensure_dir "$range_dir" "exist"
+       ensure_file "$range_dir/min" "exist" 600
+       ensure_file "$range_dir/max" "exist" 600
+}
+
+test_stats()
+{
+       stats_dir=$1
+       ensure_dir "$stats_dir" "exist"
+       for f in nr_tried sz_tried nr_applied sz_applied qt_exceeds
+       do
+               ensure_file "$stats_dir/$f" "exist" "400"
+       done
+}
+
+test_watermarks()
+{
+       watermarks_dir=$1
+       ensure_dir "$watermarks_dir" "exist"
+       ensure_file "$watermarks_dir/metric" "exist" "600"
+       ensure_file "$watermarks_dir/interval_us" "exist" "600"
+       ensure_file "$watermarks_dir/high" "exist" "600"
+       ensure_file "$watermarks_dir/mid" "exist" "600"
+       ensure_file "$watermarks_dir/low" "exist" "600"
+}
+
+test_weights()
+{
+       weights_dir=$1
+       ensure_dir "$weights_dir" "exist"
+       ensure_file "$weights_dir/sz_permil" "exist" "600"
+       ensure_file "$weights_dir/nr_accesses_permil" "exist" "600"
+       ensure_file "$weights_dir/age_permil" "exist" "600"
+}
+
+test_quotas()
+{
+       quotas_dir=$1
+       ensure_dir "$quotas_dir" "exist"
+       ensure_file "$quotas_dir/ms" "exist" 600
+       ensure_file "$quotas_dir/bytes" "exist" 600
+       ensure_file "$quotas_dir/reset_interval_ms" "exist" 600
+       test_weights "$quotas_dir/weights"
+}
+
+test_access_pattern()
+{
+       access_pattern_dir=$1
+       ensure_dir "$access_pattern_dir" "exist"
+       test_range "$access_pattern_dir/age"
+       test_range "$access_pattern_dir/nr_accesses"
+       test_range "$access_pattern_dir/sz"
+}
+
+test_scheme()
+{
+       scheme_dir=$1
+       ensure_dir "$scheme_dir" "exist"
+       ensure_file "$scheme_dir/action" "exist" "600"
+       test_access_pattern "$scheme_dir/access_pattern"
+       test_quotas "$scheme_dir/quotas"
+       test_watermarks "$scheme_dir/watermarks"
+       test_stats "$scheme_dir/stats"
+}
+
+test_schemes()
+{
+       schemes_dir=$1
+       ensure_dir "$schemes_dir" "exist"
+       ensure_file "$schemes_dir/nr_schemes" "exist" 600
+
+       ensure_write_succ  "$schemes_dir/nr_schemes" "1" "valid input"
+       test_scheme "$schemes_dir/0"
+
+       ensure_write_succ  "$schemes_dir/nr_schemes" "2" "valid input"
+       test_scheme "$schemes_dir/0"
+       test_scheme "$schemes_dir/1"
+
+       ensure_write_succ "$schemes_dir/nr_schemes" "0" "valid input"
+       ensure_dir "$schemes_dir/0" "not_exist"
+       ensure_dir "$schemes_dir/1" "not_exist"
+}
+
+test_region()
+{
+       region_dir=$1
+       ensure_dir "$region_dir" "exist"
+       ensure_file "$region_dir/start" "exist" 600
+       ensure_file "$region_dir/end" "exist" 600
+}
+
+test_regions()
+{
+       regions_dir=$1
+       ensure_dir "$regions_dir" "exist"
+       ensure_file "$regions_dir/nr_regions" "exist" 600
+
+       ensure_write_succ  "$regions_dir/nr_regions" "1" "valid input"
+       test_region "$regions_dir/0"
+
+       ensure_write_succ  "$regions_dir/nr_regions" "2" "valid input"
+       test_region "$regions_dir/0"
+       test_region "$regions_dir/1"
+
+       ensure_write_succ "$regions_dir/nr_regions" "0" "valid input"
+       ensure_dir "$regions_dir/0" "not_exist"
+       ensure_dir "$regions_dir/1" "not_exist"
+}
+
+test_target()
+{
+       target_dir=$1
+       ensure_dir "$target_dir" "exist"
+       ensure_file "$target_dir/pid_target" "exist" "600"
+       test_regions "$target_dir/regions"
+}
+
+test_targets()
+{
+       targets_dir=$1
+       ensure_dir "$targets_dir" "exist"
+       ensure_file "$targets_dir/nr_targets" "exist" 600
+
+       ensure_write_succ  "$targets_dir/nr_targets" "1" "valid input"
+       test_target "$targets_dir/0"
+
+       ensure_write_succ  "$targets_dir/nr_targets" "2" "valid input"
+       test_target "$targets_dir/0"
+       test_target "$targets_dir/1"
+
+       ensure_write_succ "$targets_dir/nr_targets" "0" "valid input"
+       ensure_dir "$targets_dir/0" "not_exist"
+       ensure_dir "$targets_dir/1" "not_exist"
+}
+
+test_intervals()
+{
+       intervals_dir=$1
+       ensure_dir "$intervals_dir" "exist"
+       ensure_file "$intervals_dir/aggr_us" "exist" "600"
+       ensure_file "$intervals_dir/sample_us" "exist" "600"
+       ensure_file "$intervals_dir/update_us" "exist" "600"
+}
+
+test_monitoring_attrs()
+{
+       monitoring_attrs_dir=$1
+       ensure_dir "$monitoring_attrs_dir" "exist"
+       test_intervals "$monitoring_attrs_dir/intervals"
+       test_range "$monitoring_attrs_dir/nr_regions"
+}
+
+test_context()
+{
+       context_dir=$1
+       ensure_dir "$context_dir" "exist"
+       ensure_file "$context_dir/operations" "exist" 600
+       test_monitoring_attrs "$context_dir/monitoring_attrs"
+       test_targets "$context_dir/targets"
+       test_schemes "$context_dir/schemes"
+}
+
+test_contexts()
+{
+       contexts_dir=$1
+       ensure_dir "$contexts_dir" "exist"
+       ensure_file "$contexts_dir/nr_contexts" "exist" 600
+
+       ensure_write_succ  "$contexts_dir/nr_contexts" "1" "valid input"
+       test_context "$contexts_dir/0"
+
+       ensure_write_fail "$contexts_dir/nr_contexts" "2" "only 0/1 are supported"
+       test_context "$contexts_dir/0"
+
+       ensure_write_succ "$contexts_dir/nr_contexts" "0" "valid input"
+       ensure_dir "$contexts_dir/0" "not_exist"
+}
+
+test_kdamond()
+{
+       kdamond_dir=$1
+       ensure_dir "$kdamond_dir" "exist"
+       ensure_file "$kdamond_dir/state" "exist" "600"
+       ensure_file "$kdamond_dir/pid" "exist" 400
+       test_contexts "$kdamond_dir/contexts"
+}
+
+test_kdamonds()
+{
+       kdamonds_dir=$1
+       ensure_dir "$kdamonds_dir" "exist"
+
+       ensure_file "$kdamonds_dir/nr_kdamonds" "exist" "600"
+
+       ensure_write_succ  "$kdamonds_dir/nr_kdamonds" "1" "valid input"
+       test_kdamond "$kdamonds_dir/0"
+
+       ensure_write_succ  "$kdamonds_dir/nr_kdamonds" "2" "valid input"
+       test_kdamond "$kdamonds_dir/0"
+       test_kdamond "$kdamonds_dir/1"
+
+       ensure_write_succ "$kdamonds_dir/nr_kdamonds" "0" "valid input"
+       ensure_dir "$kdamonds_dir/0" "not_exist"
+       ensure_dir "$kdamonds_dir/1" "not_exist"
+}
+
+test_damon_sysfs()
+{
+       damon_sysfs=$1
+       if [ ! -d "$damon_sysfs" ]
+       then
+               echo "$damon_sysfs not found"
+               exit $ksft_skip
+       fi
+
+       test_kdamonds "$damon_sysfs/kdamonds"
+}
+
+check_dependencies()
+{
+       if [ $EUID -ne 0 ]
+       then
+               echo "Run as root"
+               exit $ksft_skip
+       fi
+}
+
+check_dependencies
+test_damon_sysfs "/sys/kernel/mm/damon/admin"