taglinefilesource code
totalswap270fs/proc/array.ci.totalswap, i.totalswap-i.freeswap, i.freeswap);
totalswap80include/linux/kernel.hunsigned long totalswap;  /* Total swap space size */
totalswap1282mm/swap.cval->freeswap = val->totalswap = 0;
totalswap1293mm/swap.c++val->totalswap;
totalswap1297mm/swap.cval->totalswap <<= PAGE_SHIFT;