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-rw-r--r--src/test/test-cgroup-unit-default.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/src/test/test-cgroup-unit-default.c b/src/test/test-cgroup-unit-default.c
new file mode 100644
index 0000000..b03f6ff
--- /dev/null
+++ b/src/test/test-cgroup-unit-default.c
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stdio.h>
+
+#include "cgroup.h"
+#include "manager.h"
+#include "rm-rf.h"
+#include "tests.h"
+#include "unit.h"
+
+static int test_default_memory_low(void) {
+ _cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
+ _cleanup_(manager_freep) Manager *m = NULL;
+ Unit *root, *dml,
+ *dml_passthrough, *dml_passthrough_empty, *dml_passthrough_set_dml, *dml_passthrough_set_ml,
+ *dml_override, *dml_override_empty,
+ *dml_discard, *dml_discard_empty, *dml_discard_set_ml;
+ uint64_t dml_tree_default;
+ int r;
+
+ r = enter_cgroup_subroot(NULL);
+ if (r == -ENOMEDIUM)
+ return log_tests_skipped("cgroupfs not available");
+
+ _cleanup_free_ char *unit_dir = NULL;
+ assert_se(get_testdata_dir("units", &unit_dir) >= 0);
+ assert_se(set_unit_path(unit_dir) >= 0);
+ assert_se(runtime_dir = setup_fake_runtime_dir());
+ r = manager_new(UNIT_FILE_USER, MANAGER_TEST_RUN_BASIC, &m);
+ if (IN_SET(r, -EPERM, -EACCES)) {
+ log_error_errno(r, "manager_new: %m");
+ return log_tests_skipped("cannot create manager");
+ }
+
+ assert_se(r >= 0);
+ assert_se(manager_startup(m, NULL, NULL) >= 0);
+
+ /* dml.slice has DefaultMemoryLow=50. Beyond that, individual subhierarchies look like this:
+ *
+ * 1. dml-passthrough.slice sets MemoryLow=100. This should not affect its children, as only
+ * DefaultMemoryLow is propagated, not MemoryLow. As such, all leaf services should end up with
+ * memory.low as 50, inherited from dml.slice, *except* for dml-passthrough-set-ml.service, which
+ * should have the value of 0, as it has MemoryLow explicitly set.
+ *
+ * ┌───────────┐
+ * │ dml.slice │
+ * └─────┬─────┘
+ * MemoryLow=100
+ * ┌───────────┴───────────┐
+ * │ dml-passthrough.slice │
+ * └───────────┬───────────┘
+ * ┌───────────────────────────────────┼───────────────────────────────────┐
+ * no new settings DefaultMemoryLow=15 MemoryLow=0
+ * ┌───────────────┴───────────────┐ ┌────────────────┴────────────────┐ ┌───────────────┴────────────────┐
+ * │ dml-passthrough-empty.service │ │ dml-passthrough-set-dml.service │ │ dml-passthrough-set-ml.service │
+ * └───────────────────────────────┘ └─────────────────────────────────┘ └────────────────────────────────┘
+ *
+ * 2. dml-override.slice sets DefaultMemoryLow=10. As such, dml-override-empty.service should also
+ * end up with a memory.low of 10. dml-override.slice should still have a memory.low of 50.
+ *
+ * ┌───────────┐
+ * │ dml.slice │
+ * └─────┬─────┘
+ * DefaultMemoryLow=10
+ * ┌─────────┴──────────┐
+ * │ dml-override.slice │
+ * └─────────┬──────────┘
+ * no new settings
+ * ┌─────────────┴──────────────┐
+ * │ dml-override-empty.service │
+ * └────────────────────────────┘
+ *
+ * 3. dml-discard.slice sets DefaultMemoryLow= with no rvalue. As such,
+ * dml-discard-empty.service should end up with a value of 0.
+ * dml-discard-set-ml.service sets MemoryLow=15, and as such should have that override the
+ * reset DefaultMemoryLow value. dml-discard.slice should still have an eventual memory.low of 50.
+ *
+ * ┌───────────┐
+ * │ dml.slice │
+ * └─────┬─────┘
+ * DefaultMemoryLow=
+ * ┌─────────┴─────────┐
+ * │ dml-discard.slice │
+ * └─────────┬─────────┘
+ * ┌──────────────┴───────────────┐
+ * no new settings MemoryLow=15
+ * ┌─────────────┴─────────────┐ ┌─────────────┴──────────────┐
+ * │ dml-discard-empty.service │ │ dml-discard-set-ml.service │
+ * └───────────────────────────┘ └────────────────────────────┘
+ */
+ assert_se(manager_load_startable_unit_or_warn(m, "dml.slice", NULL, &dml) >= 0);
+
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-passthrough.slice", NULL, &dml_passthrough) >= 0);
+ assert_se(UNIT_DEREF(dml_passthrough->slice) == dml);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-passthrough-empty.service", NULL, &dml_passthrough_empty) >= 0);
+ assert_se(UNIT_DEREF(dml_passthrough_empty->slice) == dml_passthrough);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-passthrough-set-dml.service", NULL, &dml_passthrough_set_dml) >= 0);
+ assert_se(UNIT_DEREF(dml_passthrough_set_dml->slice) == dml_passthrough);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-passthrough-set-ml.service", NULL, &dml_passthrough_set_ml) >= 0);
+ assert_se(UNIT_DEREF(dml_passthrough_set_ml->slice) == dml_passthrough);
+
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-override.slice", NULL, &dml_override) >= 0);
+ assert_se(UNIT_DEREF(dml_override->slice) == dml);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-override-empty.service", NULL, &dml_override_empty) >= 0);
+ assert_se(UNIT_DEREF(dml_override_empty->slice) == dml_override);
+
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-discard.slice", NULL, &dml_discard) >= 0);
+ assert_se(UNIT_DEREF(dml_discard->slice) == dml);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-discard-empty.service", NULL, &dml_discard_empty) >= 0);
+ assert_se(UNIT_DEREF(dml_discard_empty->slice) == dml_discard);
+ assert_se(manager_load_startable_unit_or_warn(m, "dml-discard-set-ml.service", NULL, &dml_discard_set_ml) >= 0);
+ assert_se(UNIT_DEREF(dml_discard_set_ml->slice) == dml_discard);
+
+ root = UNIT_DEREF(dml->slice);
+ assert_se(!UNIT_ISSET(root->slice));
+
+ assert_se(unit_get_ancestor_memory_low(root) == CGROUP_LIMIT_MIN);
+
+ assert_se(unit_get_ancestor_memory_low(dml) == CGROUP_LIMIT_MIN);
+ dml_tree_default = unit_get_cgroup_context(dml)->default_memory_low;
+ assert_se(dml_tree_default == 50);
+
+ assert_se(unit_get_ancestor_memory_low(dml_passthrough) == 100);
+ assert_se(unit_get_ancestor_memory_low(dml_passthrough_empty) == dml_tree_default);
+ assert_se(unit_get_ancestor_memory_low(dml_passthrough_set_dml) == 50);
+ assert_se(unit_get_ancestor_memory_low(dml_passthrough_set_ml) == 0);
+
+ assert_se(unit_get_ancestor_memory_low(dml_override) == dml_tree_default);
+ assert_se(unit_get_ancestor_memory_low(dml_override_empty) == 10);
+
+ assert_se(unit_get_ancestor_memory_low(dml_discard) == dml_tree_default);
+ assert_se(unit_get_ancestor_memory_low(dml_discard_empty) == CGROUP_LIMIT_MIN);
+ assert_se(unit_get_ancestor_memory_low(dml_discard_set_ml) == 15);
+
+ return 0;
+}
+
+int main(int argc, char* argv[]) {
+ int rc = EXIT_SUCCESS;
+
+ test_setup_logging(LOG_DEBUG);
+
+ TEST_REQ_RUNNING_SYSTEMD(rc = test_default_memory_low());
+
+ return rc;
+}