cgroup__new
cgrps[nr] = cgroup__new(cgrp_names[nr], /*do_open=*/true);
cgrp = cgroup__new(name, /*do_open=*/false);
cgrp = cgroup__new($3, /*do_open=*/false);
return cgroup ?: cgroup__new(name, true);
cgrp = cgroup__new(name, open_cgroup);
struct cgroup *cgroup__new(const char *name, bool do_open);