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schlad wants to merge 1 commit into from
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Add some debug info #1310

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89 changes: 58 additions & 31 deletions tools/testing/selftests/cgroup/test_pids.c
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Original file line number Diff line number Diff line change
Expand Up @@ -79,39 +79,66 @@ static int test_pids_events(const char *root)

cg_parent = cg_name(root, "pids_parent");
cg_child = cg_name(cg_parent, "pids_child");
if (!cg_parent || !cg_child)
goto cleanup;

if (cg_create(cg_parent))
goto cleanup;
if (cg_write(cg_parent, "cgroup.subtree_control", "+pids"))
goto cleanup;
if (cg_create(cg_child))
goto cleanup;

if (cg_write(cg_parent, "pids.max", "2"))
goto cleanup;

if (cg_read_strcmp(cg_child, "pids.max", "max\n"))
goto cleanup;

if (cg_enter_current(cg_child))
goto cleanup;
if (!cg_parent || !cg_child) {
ksft_print_msg("Failed to allocate cgroup names\n");
goto cleanup;
}

if (cg_create(cg_parent)) {
ksft_print_msg("Failed to create parent cgroup: %s\n", cg_parent);
goto cleanup;
}
if (cg_write(cg_parent, "cgroup.subtree_control", "+pids")) {
ksft_print_msg("Failed to enable +pids in parent\n");
goto cleanup;
}
if (cg_create(cg_child)) {
ksft_print_msg("Failed to create child cgroup: %s\n", cg_child);
goto cleanup;
}

if (cg_write(cg_parent, "pids.max", "2")) {
ksft_print_msg("Failed to set pids.max=2 in parent\n");
goto cleanup;
}

if (cg_read_strcmp(cg_child, "pids.max", "max\n")) {
ksft_print_msg("Child pids.max is not 'max'\n");
goto cleanup;
}

if (cg_enter_current(cg_child)) {
ksft_print_msg("Failed to enter child cgroup\n");
goto cleanup;
}

pid = cg_run_nowait(cg_child, run_pause, NULL);
if (pid < 0)
goto cleanup;

if (cg_run_nowait(cg_child, run_success, NULL) != -1 || errno != EAGAIN)
goto cleanup;

if (kill(pid, SIGINT))
goto cleanup;

if (cg_read_key_long(cg_child, "pids.events", "max ") != 0)
goto cleanup;
if (cg_read_key_long(cg_parent, "pids.events", "max ") != 1)
goto cleanup;
if (pid < 0) {
ksft_print_msg("Failed to start pause process in child\n");
goto cleanup;
}

if (cg_run_nowait(cg_child, run_success, NULL) != -1 || errno != EAGAIN) {
ksft_print_msg("Unexpectedly able to fork in child (expected EAGAIN)\n");
goto cleanup;
}

if (kill(pid, SIGINT)) {
ksft_print_msg("Failed to kill pause process\n");
goto cleanup;
}

long child_max = cg_read_key_long(cg_child, "pids.events", "max ");
if (child_max != 0) {
ksft_print_msg("Unexpected child pids.events 'max' count: %ld (expected 0)\n", child_max);
goto cleanup;
}

long parent_max = cg_read_key_long(cg_parent, "pids.events", "max ");
if (parent_max != 1) {
ksft_print_msg("Unexpected parent pids.events 'max' count: %ld (expected 1)\n", parent_max);
goto cleanup;
}


ret = KSFT_PASS;
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