selftests: cgroup: add test_zswap program

Patch series "selftests: cgroup: add zswap test program".

This series adds 2 zswap related selftests that verify known and fixed
issues.  A new dedicated test program (test_zswap) is proposed since the
test cases are specific to zswap and hosts specific helpers.

The first patch adds the (empty) test program, while the other 2 add an
actual test function each.

This patch (of 3):

Add empty cgroup-zswap self test scaffold program, test functions to be
added in the next commits.

Link: https://lkml.kernel.org/r/20230621153548.428093-1-cerasuolodomenico@gmail.com
Link: https://lkml.kernel.org/r/20230621153548.428093-2-cerasuolodomenico@gmail.com
Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/cgroup/.gitignore b/tools/testing/selftests/cgroup/.gitignore
index c4a57e6..4d556df 100644 (file)
--- a/tools/testing/selftests/cgroup/.gitignore
+++ b/tools/testing/selftests/cgroup/.gitignore
@@ -5,4 +5,5 @@ test_freezer
 test_kmem
 test_kill
 test_cpu
+test_zswap
 wait_inotify

diff --git a/tools/testing/selftests/cgroup/Makefile b/tools/testing/selftests/cgroup/Makefile
index 3d26374..27dbdd7 100644 (file)
--- a/tools/testing/selftests/cgroup/Makefile
+++ b/tools/testing/selftests/cgroup/Makefile
@@ -12,6 +12,7 @@ TEST_GEN_PROGS += test_core
 TEST_GEN_PROGS += test_freezer
 TEST_GEN_PROGS += test_kill
 TEST_GEN_PROGS += test_cpu
+TEST_GEN_PROGS += test_zswap
 
 LOCAL_HDRS += $(selfdir)/clone3/clone3_selftests.h $(selfdir)/pidfd/pidfd.h
 
@@ -23,3 +24,4 @@ $(OUTPUT)/test_core: cgroup_util.c
 $(OUTPUT)/test_freezer: cgroup_util.c
 $(OUTPUT)/test_kill: cgroup_util.c
 $(OUTPUT)/test_cpu: cgroup_util.c
+$(OUTPUT)/test_zswap: cgroup_util.c

diff --git a/tools/testing/selftests/cgroup/test_zswap.c b/tools/testing/selftests/cgroup/test_zswap.c
new file mode 100644 (file)
index 0000000..0015336
--- /dev/null
+++ b/tools/testing/selftests/cgroup/test_zswap.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+
+#include <linux/limits.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "../kselftest.h"
+#include "cgroup_util.h"
+
+#define T(x) { x, #x }
+struct zswap_test {
+       int (*fn)(const char *root);
+       const char *name;
+} tests[] = {
+};
+#undef T
+
+static bool zswap_configured(void)
+{
+       return access("/sys/module/zswap", F_OK) == 0;
+}
+
+int main(int argc, char **argv)
+{
+       char root[PATH_MAX];
+       int i, ret = EXIT_SUCCESS;
+
+       if (cg_find_unified_root(root, sizeof(root)))
+               ksft_exit_skip("cgroup v2 isn't mounted\n");
+
+       if (!zswap_configured())
+               ksft_exit_skip("zswap isn't configured\n");
+
+       /*
+        * Check that memory controller is available:
+        * memory is listed in cgroup.controllers
+        */
+       if (cg_read_strstr(root, "cgroup.controllers", "memory"))
+               ksft_exit_skip("memory controller isn't available\n");
+
+       if (cg_read_strstr(root, "cgroup.subtree_control", "memory"))
+               if (cg_write(root, "cgroup.subtree_control", "+memory"))
+                       ksft_exit_skip("Failed to set memory controller\n");
+
+       for (i = 0; i < ARRAY_SIZE(tests); i++) {
+               switch (tests[i].fn(root)) {
+               case KSFT_PASS:
+                       ksft_test_result_pass("%s\n", tests[i].name);
+                       break;
+               case KSFT_SKIP:
+                       ksft_test_result_skip("%s\n", tests[i].name);
+                       break;
+               default:
+                       ret = EXIT_FAILURE;
+                       ksft_test_result_fail("%s\n", tests[i].name);
+                       break;
+               }
+       }
+
+       return ret;
+}