+ if (cg_freeze_nowait(cgroup, true))
+ goto cleanup;
+
+ /*
+ * 2) Sleep for 1000 us. Check that the freeze time is at
+ * least 1000 us.
+ */
+ usleep(1000);
+ curr = cg_check_freezetime(cgroup);
+ if (curr < 1000) {
+ debug("Expect time (%ld) to be at least 1000 us\n",
+ curr);
+ goto cleanup;
+ }
+
+ /*
+ * 3) Unfreeze the cgroup. Check that the freeze time is
+ * larger than at 2).
+ */
+ if (cg_freeze_nowait(cgroup, false))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 4) Check the freeze time again to ensure that it has not
+ * changed.
+ */
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr != prev) {
+ debug("Expect time (%ld) to be unchanged from previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (cgroup)
+ cg_destroy(cgroup);
+ free(cgroup);
+ return ret;
+}
+
+/*
+ * A simple test for cgroup freezer time accounting. This test follows
+ * the same flow as test_cgfreezer_time_empty, but with a single process
+ * in the cgroup.
+ */
+static int test_cgfreezer_time_simple(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *cgroup = NULL;
+ long prev, curr;
+
+ cgroup = cg_name(root, "cg_time_test_simple");
+ if (!cgroup)
+ goto cleanup;
+
+ /*
+ * 1) Create a cgroup and check that its freeze time is 0.
+ */
+ if (cg_create(cgroup))
+ goto cleanup;
+
+ curr = cg_check_freezetime(cgroup);
+ if (curr < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+ if (curr > 0) {
+ debug("Expect time (%ld) to be 0\n", curr);
+ goto cleanup;
+ }
+
+ /*
+ * 2) Populate the cgroup with one child and check that the
+ * freeze time is still 0.
+ */
+ cg_run_nowait(cgroup, child_fn, NULL);
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr > prev) {
+ debug("Expect time (%ld) to be 0\n", curr);
+ goto cleanup;
+ }
+
+ if (cg_freeze_nowait(cgroup, true))
+ goto cleanup;
+
+ /*
+ * 3) Sleep for 1000 us. Check that the freeze time is at
+ * least 1000 us.
+ */
+ usleep(1000);
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr < 1000) {
+ debug("Expect time (%ld) to be at least 1000 us\n",
+ curr);
+ goto cleanup;
+ }
+
+ /*
+ * 4) Unfreeze the cgroup. Check that the freeze time is
+ * larger than at 3).
+ */
+ if (cg_freeze_nowait(cgroup, false))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 5) Sleep for 1000 us. Check that the freeze time is the
+ * same as at 4).
+ */
+ usleep(1000);
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr != prev) {
+ debug("Expect time (%ld) to be unchanged from previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (cgroup)
+ cg_destroy(cgroup);
+ free(cgroup);
+ return ret;
+}
+
+/*
+ * Test that freezer time accounting works as expected, even while we're
+ * populating a cgroup with processes.
+ */
+static int test_cgfreezer_time_populate(const char *root)
+{
+ int ret = KSFT_FAIL;
+ char *cgroup = NULL;
+ long prev, curr;
+ int i;
+
+ cgroup = cg_name(root, "cg_time_test_populate");
+ if (!cgroup)
+ goto cleanup;
+
+ if (cg_create(cgroup))
+ goto cleanup;
+
+ curr = cg_check_freezetime(cgroup);
+ if (curr < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+ if (curr > 0) {
+ debug("Expect time (%ld) to be 0\n", curr);
+ goto cleanup;
+ }
+
+ /*
+ * 1) Populate the cgroup with 100 processes. Check that
+ * the freeze time is 0.
+ */
+ for (i = 0; i < 100; i++)
+ cg_run_nowait(cgroup, child_fn, NULL);
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr != prev) {
+ debug("Expect time (%ld) to be 0\n", curr);
+ goto cleanup;
+ }
+
+ /*
+ * 2) Wait for the group to become fully populated. Check
+ * that the freeze time is 0.
+ */
+ if (cg_wait_for_proc_count(cgroup, 100))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr != prev) {
+ debug("Expect time (%ld) to be 0\n", curr);
+ goto cleanup;
+ }
+
+ /*
+ * 3) Freeze the cgroup and then populate it with 100 more
+ * processes. Check that the freeze time continues to grow.
+ */
+ if (cg_freeze_nowait(cgroup, true))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ for (i = 0; i < 100; i++)
+ cg_run_nowait(cgroup, child_fn, NULL);
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 4) Wait for the group to become fully populated. Check
+ * that the freeze time is larger than at 3).
+ */
+ if (cg_wait_for_proc_count(cgroup, 200))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 5) Unfreeze the cgroup. Check that the freeze time is
+ * larger than at 4).
+ */
+ if (cg_freeze_nowait(cgroup, false))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 6) Kill the processes. Check that the freeze time is the
+ * same as it was at 5).
+ */
+ if (cg_killall(cgroup))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr != prev) {
+ debug("Expect time (%ld) to be unchanged from previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ /*
+ * 7) Freeze and unfreeze the cgroup. Check that the freeze
+ * time is larger than it was at 6).
+ */
+ if (cg_freeze_nowait(cgroup, true))
+ goto cleanup;
+ if (cg_freeze_nowait(cgroup, false))
+ goto cleanup;
+ prev = curr;
+ curr = cg_check_freezetime(cgroup);
+ if (curr <= prev) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr, prev);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (cgroup)
+ cg_destroy(cgroup);
+ free(cgroup);
+ return ret;
+}
+
+/*
+ * Test that frozen time for a cgroup continues to work as expected,
+ * even as processes are migrated. Frozen cgroup A's freeze time should
+ * continue to increase and running cgroup B's should stay 0.
+ */
+static int test_cgfreezer_time_migrate(const char *root)
+{
+ long prev_A, curr_A, curr_B;
+ char *cgroup[2] = {0};
+ int ret = KSFT_FAIL;
+ int pid;
+
+ cgroup[0] = cg_name(root, "cg_time_test_migrate_A");
+ if (!cgroup[0])
+ goto cleanup;
+
+ cgroup[1] = cg_name(root, "cg_time_test_migrate_B");
+ if (!cgroup[1])
+ goto cleanup;
+
+ if (cg_create(cgroup[0]))
+ goto cleanup;
+
+ if (cg_check_freezetime(cgroup[0]) < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_create(cgroup[1]))
+ goto cleanup;
+
+ pid = cg_run_nowait(cgroup[0], child_fn, NULL);
+ if (pid < 0)
+ goto cleanup;
+
+ if (cg_wait_for_proc_count(cgroup[0], 1))
+ goto cleanup;
+
+ curr_A = cg_check_freezetime(cgroup[0]);
+ if (curr_A) {
+ debug("Expect time (%ld) to be 0\n", curr_A);
+ goto cleanup;
+ }
+ curr_B = cg_check_freezetime(cgroup[1]);
+ if (curr_B) {
+ debug("Expect time (%ld) to be 0\n", curr_B);
+ goto cleanup;
+ }
+
+ /*
+ * Freeze cgroup A.
+ */
+ if (cg_freeze_wait(cgroup[0], true))
+ goto cleanup;
+ prev_A = curr_A;
+ curr_A = cg_check_freezetime(cgroup[0]);
+ if (curr_A <= prev_A) {
+ debug("Expect time (%ld) to be > 0\n", curr_A);
+ goto cleanup;
+ }
+
+ /*
+ * Migrate from A (frozen) to B (running).
+ */
+ if (cg_enter(cgroup[1], pid))
+ goto cleanup;
+
+ usleep(1000);
+ curr_B = cg_check_freezetime(cgroup[1]);
+ if (curr_B) {
+ debug("Expect time (%ld) to be 0\n", curr_B);
+ goto cleanup;
+ }
+
+ prev_A = curr_A;
+ curr_A = cg_check_freezetime(cgroup[0]);
+ if (curr_A <= prev_A) {
+ debug("Expect time (%ld) to be more than previous check
(%ld)\n",
+ curr_A, prev_A);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (cgroup[0])
+ cg_destroy(cgroup[0]);
+ free(cgroup[0]);
+ if (cgroup[1])
+ cg_destroy(cgroup[1]);
+ free(cgroup[1]);
+ return ret;
+}
+
+/*
+ * The test creates a cgroup and freezes it. Then it creates a child
cgroup.
+ * After that it checks that the child cgroup has a non-zero freeze time
+ * that is less than the parent's. Next, it freezes the child, unfreezes
+ * the parent, and sleeps. Finally, it checks that the child's freeze
+ * time has grown larger than the parent's.
+ */
+static int test_cgfreezer_time_parent(const char *root)
+{
+ char *parent, *child = NULL;
+ int ret = KSFT_FAIL;
+ long ptime, ctime;
+
+ parent = cg_name(root, "cg_test_parent_A");
+ if (!parent)
+ goto cleanup;
+
+ child = cg_name(parent, "cg_test_parent_B");
+ if (!child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_check_freezetime(parent) < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_freeze_wait(parent, true))
+ goto cleanup;
+
+ usleep(1000);
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_check_frozen(child, true))
+ goto cleanup;
+
+ /*
+ * Since the parent was frozen the entire time the child cgroup
+ * was being created, we expect the parent's freeze time to be
+ * larger than the child's.
+ *
+ * Ideally, we would be able to check both times simultaneously,
+ * but here we get the child's after we get the parent's.
+ */
+ ptime = cg_check_freezetime(parent);
+ ctime = cg_check_freezetime(child);
+ if (ptime <= ctime) {
+ debug("Expect ptime (%ld) > ctime (%ld)\n", ptime, ctime);
+ goto cleanup;
+ }
+
+ if (cg_freeze_nowait(child, true))
+ goto cleanup;
+
+ if (cg_freeze_wait(parent, false))
+ goto cleanup;
+
+ if (cg_check_frozen(child, true))
+ goto cleanup;
+
+ usleep(100000);
+
+ ctime = cg_check_freezetime(child);
+ ptime = cg_check_freezetime(parent);
+
+ if (ctime <= ptime) {
+ debug("Expect ctime (%ld) > ptime (%ld)\n", ctime, ptime);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ free(child);
+ if (parent)
+ cg_destroy(parent);
+ free(parent);
+ return ret;
+}
+
+/*
+ * The test creates a parent cgroup and a child cgroup. Then, it freezes
+ * the child and checks that the child's freeze time is greater than the
+ * parent's, which should be zero.
+ */
+static int test_cgfreezer_time_child(const char *root)
+{
+ char *parent, *child = NULL;
+ int ret = KSFT_FAIL;
+ long ptime, ctime;
+
+ parent = cg_name(root, "cg_test_child_A");
+ if (!parent)
+ goto cleanup;
+
+ child = cg_name(parent, "cg_test_child_B");
+ if (!child)
+ goto cleanup;
+
+ if (cg_create(parent))
+ goto cleanup;
+
+ if (cg_check_freezetime(parent) < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_create(child))
+ goto cleanup;
+
+ if (cg_freeze_wait(child, true))
+ goto cleanup;
+
+ ctime = cg_check_freezetime(child);
+ ptime = cg_check_freezetime(parent);
+ if (ptime != 0) {
+ debug("Expect ptime (%ld) to be 0\n", ptime);
+ goto cleanup;
+ }
+
+ if (ctime <= ptime) {
+ debug("Expect ctime (%ld) <= ptime (%ld)\n", ctime, ptime);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ if (child)
+ cg_destroy(child);
+ free(child);
+ if (parent)
+ cg_destroy(parent);
+ free(parent);
+ return ret;
+}
+
+/*
+ * The test creates the following hierarchy:
+ * A
+ * |
+ * B
+ * |
+ * C
+ *
+ * Then it freezes the cgroups in the order C, B, A.
+ * Then it unfreezes the cgroups in the order A, B, C.
+ * Then it checks that C's freeze time is larger than B's and
+ * that B's is larger than A's.
+ */
+static int test_cgfreezer_time_nested(const char *root)
+{
+ char *cgroup[3] = {0};
+ int ret = KSFT_FAIL;
+ long time[3] = {0};
+ int i;
+
+ cgroup[0] = cg_name(root, "cg_test_time_A");
+ if (!cgroup[0])
+ goto cleanup;
+
+ cgroup[1] = cg_name(cgroup[0], "B");
+ if (!cgroup[1])
+ goto cleanup;
+
+ cgroup[2] = cg_name(cgroup[1], "C");
+ if (!cgroup[2])
+ goto cleanup;
+
+ if (cg_create(cgroup[0]))
+ goto cleanup;
+
+ if (cg_check_freezetime(cgroup[0]) < 0) {
+ ret = KSFT_SKIP;
+ goto cleanup;
+ }
+
+ if (cg_create(cgroup[1]))
+ goto cleanup;
+
+ if (cg_create(cgroup[2]))
+ goto cleanup;
+
+ if (cg_freeze_nowait(cgroup[2], true))
+ goto cleanup;
+
+ if (cg_freeze_nowait(cgroup[1], true))
+ goto cleanup;
+
+ if (cg_freeze_nowait(cgroup[0], true))
+ goto cleanup;
+
+ usleep(1000);
+
+ if (cg_freeze_nowait(cgroup[0], false))
+ goto cleanup;
+
+ if (cg_freeze_nowait(cgroup[1], false))
+ goto cleanup;
+
+ if (cg_freeze_nowait(cgroup[2], false))
+ goto cleanup;
+
+ time[2] = cg_check_freezetime(cgroup[2]);
+ time[1] = cg_check_freezetime(cgroup[1]);
+ time[0] = cg_check_freezetime(cgroup[0]);
+
+ if (time[2] <= time[1]) {
+ debug("Expect C's time (%ld) > B's time (%ld)", time[2],
time[1]);
+ goto cleanup;
+ }
+
+ if (time[1] <= time[0]) {
+ debug("Expect B's time (%ld) > A's time (%ld)", time[1],
time[0]);
+ goto cleanup;
+ }
+
+ ret = KSFT_PASS;
+
+cleanup:
+ for (i = 2; i >= 0 && cgroup[i]; i--) {
+ cg_destroy(cgroup[i]);
+ free(cgroup[i]);
+ }
+
+ return ret;
+}
+
#define T(x) { x, #x }
struct cgfreezer_test {
int (*fn)(const char *root);
@@ -819,6 +1475,13 @@ struct cgfreezer_test {
T(test_cgfreezer_stopped),
T(test_cgfreezer_ptraced),
T(test_cgfreezer_vfork),
+ T(test_cgfreezer_time_empty),
+ T(test_cgfreezer_time_simple),
+ T(test_cgfreezer_time_populate),
+ T(test_cgfreezer_time_migrate),
+ T(test_cgfreezer_time_parent),
+ T(test_cgfreezer_time_child),
+ T(test_cgfreezer_time_nested),
};
#undef T
