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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/[email protected] Signed-off-by: SeongJae Park <[email protected]> Cc: David Rientjes <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Shuah Khan <[email protected]> Cc: Xin Hao <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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‎tools/testing/selftests/damon/Makefile

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@@ -6,5 +6,6 @@ TEST_GEN_FILES += huge_count_read_write
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TEST_FILES = _chk_dependency.sh _debugfs_common.sh
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TEST_PROGS = debugfs_attrs.sh debugfs_schemes.sh debugfs_target_ids.sh
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TEST_PROGS += debugfs_empty_targets.sh debugfs_huge_count_read_write.sh
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TEST_PROGS += sysfs.sh
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include ../lib.mk

‎tools/testing/selftests/damon/sysfs.sh

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

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