PCU_CMD_SAVE
int flags = PCU_CMD_SAVE;
if (flags & PCU_CMD_SAVE) {
.flags = PCU_CMD_SAVE | PCU_CMD_RELEASE };
pcu_do_op(pcu, oncpu_lwp, PCU_CMD_SAVE | PCU_CMD_RELEASE);
pcu_lwp_op(pcu, l, PCU_CMD_SAVE | PCU_CMD_RELEASE);
pcu_do_op(pcu, l, PCU_CMD_SAVE | PCU_CMD_RELEASE);