taglinefilesource code
totalswap168fs/proc/array.ci.totalswap, i.totalswap-i.freeswap, i.freeswap);
totalswap81include/linux/kernel.hunsigned long totalswap;  /* Total swap space size */
totalswap903mm/swap.cval->freeswap = val->totalswap = 0;
totalswap914mm/swap.c++val->totalswap;
totalswap918mm/swap.cval->totalswap <<= PAGE_SHIFT;