SWAP_STATS
rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
case SWAP_STATS:
if (SCARG(uap, cmd) == SWAP_STATS) {
rnswap = swapctl(SWAP_STATS, (void *)swap_devices, nswap);
rnswap = swapctl(SWAP_STATS, swdev, nswap);
if (swapctl(SWAP_STATS, swdev, nswap) == -1)