vm_event_state
DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu);