[Linux]CONFIG_HIGHMEM

http://blog.chinaunix.net/uid-13377723-id-2895975.html

若是被disabled, 則在/proc/meminfo 如下不輸出: #ifdef CONFIG_HIGHMEM "HighTotal: %8lu kB\n" "HighFree: %8lu kB\n" "LowTotal: %8lu kB\n" "LowFree: %8lu kB\n" #endif