https://blog.gongquiz.com/2022/09/14/%eb%ac%b4%eb%a3%8c%ed%95%b5%ec%a4%91-%ec%b5%9c%ea%b3%a0-%ec%84%b1%eb%8a%a5%ec%9d%80-%ec%8b%9c%eb%83%85%ec%8a%a4%ea%b8%89-krnl-%eb%8b%a4%ec%9a%b4%eb%a1%9c%eb%93%9c-%eb%b0%a9%eb%b2%95-%e3%81%b5/