linux-kernel - [PATCH 4/4] selftests/damon: add tests for DAMON_LRU

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Date:   Tue, 25 Oct 2022 17:36:50 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH 4/4] selftests/damon: add tests for DAMON_LRU_SORT's enabled parameter

Adds simple test cases for DAMON_LRU_SORT's 'enabled' parameter.  Those
tests are focusing on the synchronous behavior of DAMON_RECLAIM enabling
and disabling.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 tools/testing/selftests/damon/Makefile    |  2 +-
 tools/testing/selftests/damon/lru_sort.sh | 41 +++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100755 tools/testing/selftests/damon/lru_sort.sh

diff --git a/tools/testing/selftests/damon/Makefile b/tools/testing/selftests/damon/Makefile
index dbbf18cb3e6b..af490acc5348 100644
--- a/tools/testing/selftests/damon/Makefile
+++ b/tools/testing/selftests/damon/Makefile
@@ -8,6 +8,6 @@ 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 += debugfs_duplicate_context_creation.sh
 TEST_PROGS += sysfs.sh
-TEST_PROGS += reclaim.sh
+TEST_PROGS += reclaim.sh lru_sort.sh
 
 include ../lib.mk
diff --git a/tools/testing/selftests/damon/lru_sort.sh b/tools/testing/selftests/damon/lru_sort.sh
new file mode 100755
index 000000000000..61b80197c896
--- /dev/null
+++ b/tools/testing/selftests/damon/lru_sort.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+if [ $EUID -ne 0 ]
+then
+	echo "Run as root"
+	exit $ksft_skip
+fi
+
+damon_lru_sort_enabled="/sys/module/damon_lru_sort/parameters/enabled"
+if [ ! -f "$damon_lru_sort_enabled" ]
+then
+	echo "No 'enabled' file.  Maybe DAMON_LRU_SORT not built"
+	exit $ksft_skip
+fi
+
+nr_kdamonds=$(pgrep kdamond | wc -l)
+if [ "$nr_kdamonds" -ne 0 ]
+then
+	echo "Another kdamond is running"
+	exit $ksft_skip
+fi
+
+echo Y > "$damon_lru_sort_enabled"
+nr_kdamonds=$(pgrep kdamond | wc -l)
+if [ "$nr_kdamonds" -ne 1 ]
+then
+	echo "kdamond is not turned on"
+	exit 1
+fi
+
+echo N > "$damon_lru_sort_enabled"
+nr_kdamonds=$(pgrep kdamond | wc -l)
+if [ "$nr_kdamonds" -ne 0 ]
+then
+	echo "kdamond is not turned off"
+	exit 1
+fi
-- 
2.25.1