{"id":94485,"date":"2026-04-12T18:30:52","date_gmt":"2026-04-12T11:30:52","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=94485"},"modified":"2026-04-12T18:30:54","modified_gmt":"2026-04-12T11:30:54","slug":"linux-kernel-la-gi","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/","title":{"rendered":"Linux Kernel l\u00e0 g\u00ec: C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Linux_Kernel_co_vai_tro_va_uu_diem_gi\" >Linux Kernel c\u00f3 vai tr\u00f2 v\u00e0 \u01b0u \u0111i\u1ec3m g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Kien_truc_Linux_Kernel_Monolithic_Kernel_va_mo_hinh_Kernel_Space_%E2%80%93_User_Space\" >Ki\u1ebfn tr\u00fac Linux Kernel: Monolithic Kernel v\u00e0 m\u00f4 h\u00ecnh Kernel Space \u2013 User Space<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Linux_Kernel_hoat_dong_nhu_the_nao\" >Linux Kernel ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Cac_thanh_phan_cua_Linux_Kernel\" >C\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a Linux Kernel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Linux_Kernel_duoc_su_dung_the_nao_trong_thuc_te\" >Linux Kernel \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u1ebf n\u00e0o trong th\u1ef1c t\u1ebf?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Cac_lenh_co_ban_de_lam_viec_voi_Linux_kernel\" >C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Cau_hoi_thuong_gap_ve_Linux_kernel\" >C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 Linux kernel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/#Tong_ket\" >T\u1ed5ng k\u1ebft<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><strong><em>Linux kernel l\u00e0 ph\u1ea7n c\u1ed1t l\u00f5i bi\u1ebfn Linux tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng \u0111\u00e1ng tin c\u1eady cho server, cloud, container, thi\u1ebft b\u1ecb nh\u00fang v\u00e0 v\u00f4 s\u1ed1 h\u1ec7 th\u1ed1ng h\u1ea1 t\u1ea7ng quan tr\u1ecdng tr\u00ean to\u00e0n th\u1ebf gi\u1edbi. D\u00f9 kh\u00f4ng tr\u1ef1c ti\u1ebfp nh\u00ecn th\u1ea5y, kernel l\u1ea1i l\u00e0 th\u00e0nh ph\u1ea7n quy\u1ebft \u0111\u1ecbnh c\u00e1ch ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m ph\u1ed1i h\u1ee3p v\u1edbi nhau.<\/em><\/strong><\/p>\n\n\n\n<p>\u0110\u1ecdc b\u00e0i vi\u1ebft n\u00e0y \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Linux Kernel l\u00e0 g\u00ec? C\u00f3 vai tr\u00f2 g\u00ec trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh Linux?<\/li>\n\n\n\n<li>Ki\u1ebfn tr\u00fac monolithic c\u1ee7a Linux kernel<\/li>\n\n\n\n<li>C\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a Linux Kernel<\/li>\n\n\n\n<li>M\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh c\u0103n b\u1ea3n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-linux-kernel-co-vai-tro-va-\u01b0u-di\u1ec3m-gi\"><span class=\"ez-toc-section\" id=\"Linux_Kernel_co_vai_tro_va_uu_diem_gi\"><\/span><strong>Linux Kernel c\u00f3 vai tr\u00f2 v\u00e0 \u01b0u \u0111i\u1ec3m g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Linux kernel l\u00e0 ph\u1ea7n l\u00f5i c\u1ee7a <strong><a href=\"https:\/\/itviec.com\/blog\/linux\/\" target=\"_blank\" rel=\"noreferrer noopener\">h\u1ec7 \u0111i\u1ec1u h\u00e0nh Linux<\/a><\/strong>, ch\u1ecbu tr\u00e1ch nhi\u1ec7m qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean ph\u1ea7n c\u1ee9ng v\u00e0 cung c\u1ea5p m\u00f4i tr\u01b0\u1eddng n\u1ec1n t\u1ea3ng \u0111\u1ec3 c\u00e1c \u1ee9ng d\u1ee5ng v\u00e0 d\u1ecbch v\u1ee5 ho\u1ea1t \u0111\u1ed9ng.\u00a0<\/p>\n\n\n\n<p>Linux kernel ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t l\u1edbp trung gian gi\u1eefa ph\u1ea7n c\u1ee9ng (CPU, RAM, thi\u1ebft b\u1ecb l\u01b0u tr\u1eef, thi\u1ebft b\u1ecb ngo\u1ea1i vi) v\u00e0 ph\u1ea7n m\u1ec1m c\u1ea5p cao m\u00e0 ng\u01b0\u1eddi d\u00f9ng tr\u1ef1c ti\u1ebfp t\u01b0\u01a1ng t\u00e1c.&nbsp;<\/p>\n\n\n\n<p>Linux kernel \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh d\u01b0\u1edbi gi\u1ea5y ph\u00e9p GPL (GNU General Public License), thi\u1ebft k\u1ebf d\u1ea1ng m\u00f4-\u0111un n\u00ean n\u00f3 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng linh ho\u1ea1t, h\u1ed7 tr\u1ee3 nhi\u1ec1u ki\u1ebfn tr\u00fac ph\u1ea7n c\u1ee9ng v\u00e0 \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh cho c\u00e1c h\u1ec7 th\u1ed1ng t\u1eeb m\u00e1y ch\u1ee7, thi\u1ebft b\u1ecb nh\u00fang \u0111\u1ebfn smartphone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ki\u1ebfn-truc-linux-kernel-monolithic-kernel-va-mo-hinh-kernel-space-user-space\"><span class=\"ez-toc-section\" id=\"Kien_truc_Linux_Kernel_Monolithic_Kernel_va_mo_hinh_Kernel_Space_%E2%80%93_User_Space\"><\/span><strong>Ki\u1ebfn tr\u00fac Linux Kernel: Monolithic Kernel v\u00e0 m\u00f4 h\u00ecnh Kernel Space \u2013 User Space<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Linux \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i l\u00e0 monolithic kernel, ngh\u0129a l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n quan tr\u1ecdng c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh nh\u01b0 qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb, l\u1eadp l\u1ecbch ti\u1ebfn tr\u00ecnh, driver thi\u1ebft b\u1ecb, h\u1ec7 th\u1ed1ng t\u1ec7p \u0111\u1ec1u ch\u1ea1y trong <strong>kernel space<\/strong>.&nbsp;<\/p>\n\n\n\n<p>M\u1ed9t trong nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng c\u1ee7a Linux l\u00e0 s\u1ef1 t\u00e1ch bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa hai \u201ckh\u00f4ng gian\u201d ho\u1ea1t \u0111\u1ed9ng: kernel space v\u00e0 user space. Vi\u1ec7c ph\u00e2n chia n\u00e0y gi\u00fap h\u1ec7 th\u1ed1ng v\u1eeba m\u1ea1nh m\u1ebd v\u1eeba an to\u00e0n, h\u1ea1n ch\u1ebf t\u1ed1i \u0111a vi\u1ec7c l\u1ed7i \u1ee9ng d\u1ee5ng l\u00e0m s\u1eadp to\u00e0n b\u1ed9 m\u00e1y.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kernel space<\/strong> l\u00e0 n\u01a1i kernel ho\u1ea1t \u0111\u1ed9ng v\u1edbi \u0111\u1eb7c quy\u1ec1n cao nh\u1ea5t (ring 0), c\u00f3 th\u1ec3 truy c\u1eadp tr\u1ef1c ti\u1ebfp ph\u1ea7n c\u1ee9ng v\u00e0 qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng. M\u1ecdi l\u1ed7i trong kernel space \u0111\u1ec1u c\u00f3 th\u1ec3 g\u00e2y crash to\u00e0n h\u1ec7 th\u1ed1ng.&nbsp;<\/li>\n\n\n\n<li><strong>User space<\/strong> l\u00e0 n\u01a1i c\u00e1c \u1ee9ng d\u1ee5ng th\u00f4ng th\u01b0\u1eddng ch\u1ea1y v\u1edbi quy\u1ec1n h\u1ea1n gi\u1edbi h\u1ea1n h\u01a1n (ring 3 trong ki\u1ebfn tr\u00fac x86\/x86-64), kh\u00f4ng th\u1ec3 t\u01b0\u01a1ng t\u00e1c tr\u1ef1c ti\u1ebfp ph\u1ea7n c\u1ee9ng. C\u00e1c ch\u01b0\u01a1ng tr\u00ecnh ph\u1ea3i th\u00f4ng qua kernel b\u1eb1ng h\u1ec7 th\u1ed1ng system call \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 c\u1ea5p th\u1ea5p.<\/li>\n<\/ul>\n\n\n\n<p>Nh\u1edd m\u00f4 h\u00ecnh ph\u00e2n t\u00e1ch n\u00e0y, Linux kernel \u0111\u00f3ng vai tr\u00f2 v\u1eeba l\u00e0 \u201cng\u01b0\u1eddi g\u00e1c c\u1ed5ng\u201d, v\u1eeba l\u00e0 \u201cng\u01b0\u1eddi \u0111i\u1ec1u ph\u1ed1i\u201d m\u1ecdi ho\u1ea1t \u0111\u1ed9ng trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh. Kernel \u0111\u1ea3m b\u1ea3o m\u1ecdi y\u00eau c\u1ea7u t\u1eeb \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh thao t\u00e1c ph\u1ea7n c\u1ee9ng h\u1ee3p l\u1ec7, duy tr\u00ec b\u1ea3o m\u1eadt, c\u00e1ch ly l\u1ed7i v\u00e0 t\u1ed1i \u01b0u hi\u1ec7u n\u0103ng. \u0110\u00e2y l\u00e0 l\u00fd do Linux c\u00f3 th\u1ec3 v\u1eadn h\u00e0nh \u0111\u01b0\u1ee3c nh\u1eefng h\u1ec7 th\u1ed1ng l\u1edbn.&nbsp;&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-vi-sao-linux-la-monolithic-kernel-nh\u01b0ng-v\u1eabn-linh-ho\u1ea1t\"><strong>V\u00ec sao Linux l\u00e0 \u201cmonolithic kernel\u201d nh\u01b0ng v\u1eabn linh ho\u1ea1t?<\/strong><\/h3>\n\n\n\n<p>V\u1ec1 l\u00fd thuy\u1ebft, monolithic kernel th\u01b0\u1eddng b\u1ecb xem l\u00e0 \u201cc\u1ed3ng k\u1ec1nh\u201d v\u00e0 kh\u00f3 m\u1edf r\u1ed9ng, nh\u01b0ng Linux l\u1ea1i l\u00e0 v\u00ed d\u1ee5 n\u1ed5i b\u1eadt cho th\u1ea5y m\u1ed9t monolithic kernel ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 linh ho\u1ea1t v\u00e0 hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<p>\u0110i\u1ec3m l\u00e0m n\u00ean s\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh l\u00e0 c\u01a1 ch\u1ebf loadable kernel modules (LKM). C\u00e1c module n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c n\u1ea1p (load) ho\u1eb7c g\u1ee1 (unload) kh\u1ecfi kernel ngay khi h\u1ec7 th\u1ed1ng \u0111ang ch\u1ea1y, m\u00e0 kh\u00f4ng c\u1ea7n bi\u00ean d\u1ecbch l\u1ea1i kernel hay kh\u1edfi \u0111\u1ed9ng l\u1ea1i m\u00e1y. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p Linux:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Th\u00eam\/b\u1ecf driver thi\u1ebft b\u1ecb theo nhu c\u1ea7u<\/li>\n\n\n\n<li>Tri\u1ec3n khai t\u00ednh n\u0103ng m\u1edbi m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng h\u1ec7 th\u1ed1ng \u0111ang ch\u1ea1y<\/li>\n\n\n\n<li>T\u1ed1i \u01b0u k\u00edch th\u01b0\u1edbc kernel b\u1eb1ng c\u00e1ch ch\u1ec9 gi\u1eef nh\u1eefng module th\u1ef1c s\u1ef1 c\u1ea7n<\/li>\n\n\n\n<li>H\u1ed7 tr\u1ee3 ph\u1ea7n c\u1ee9ng m\u1edbi ho\u1eb7c thay th\u1ebf th\u00e0nh ph\u1ea7n l\u1ed7i th\u1eddi r\u1ea5t nhanh.<\/li>\n<\/ul>\n\n\n\n<p>N\u00f3i c\u00e1ch kh\u00e1c, Linux k\u1ebft h\u1ee3p \u0111\u01b0\u1ee3c \u01b0u \u0111i\u1ec3m v\u1ec1 hi\u1ec7u n\u0103ng c\u1ee7a monolithic kernel v\u1edbi s\u1ef1 linh ho\u1ea1t g\u1ea7n nh\u01b0 microkernel nh\u1edd kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng \u0111\u1ed9ng th\u00f4ng qua module. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng l\u00fd do l\u1edbn khi\u1ebfn Linux \u0111\u01b0\u1ee3c d\u00f9ng r\u1ed9ng r\u00e3i trong server, cloud v\u00e0 c\u1ea3 c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-linux-kernel-ho\u1ea1t-d\u1ed9ng-nh\u01b0-th\u1ebf-nao\"><span class=\"ez-toc-section\" id=\"Linux_Kernel_hoat_dong_nhu_the_nao\"><\/span><strong>Linux Kernel ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Linux kernel ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t \u201cb\u1ed9 \u0111i\u1ec1u ph\u1ed1i trung t\u00e2m\u201d \u0111\u1ee9ng gi\u1eefa ph\u1ea7n c\u1ee9ng v\u00e0 \u1ee9ng d\u1ee5ng, \u0111\u1ea3m nh\u1eadn nhi\u1ec7m v\u1ee5 qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean v\u00e0 x\u1eed l\u00fd m\u1ecdi y\u00eau c\u1ea7u m\u00e0 h\u1ec7 th\u1ed1ng ph\u1ea3i th\u1ef1c hi\u1ec7n.&nbsp;<\/p>\n\n\n\n<p>Khi m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh trong user space mu\u1ed1n s\u1eed d\u1ee5ng CPU, \u0111\u1ecdc file, truy c\u1eadp m\u1ea1ng hay giao ti\u1ebfp v\u1edbi thi\u1ebft b\u1ecb, n\u00f3 kh\u00f4ng th\u1ec3 thao t\u00e1c tr\u1ef1c ti\u1ebfp m\u00e0 ph\u1ea3i g\u1eedi y\u00eau c\u1ea7u th\u00f4ng qua system call \u2192 Kernel s\u1ebd nh\u1eadn y\u00eau c\u1ea7u n\u00e0y \u2192 ki\u1ec3m tra quy\u1ec1n truy c\u1eadp \u2192 quy\u1ebft \u0111\u1ecbnh ph\u01b0\u01a1ng th\u1ee9c x\u1eed l\u00fd \u2192 giao nhi\u1ec7m v\u1ee5 cho ph\u1ea7n c\u1ee9ng ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra li\u00ean t\u1ee5c th\u00f4ng qua c\u00e1c nh\u00f3m c\u01a1 ch\u1ebf ch\u00ednh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110i\u1ec1u ph\u1ed1i CPU: <\/strong>Kernel li\u00ean t\u1ee5c theo d\u00f5i t\u1ea5t c\u1ea3 ti\u1ebfn tr\u00ecnh \u0111ang ch\u1ea1y, \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 \u01b0u ti\u00ean v\u00e0 quy\u1ebft \u0111\u1ecbnh ti\u1ebfn tr\u00ecnh n\u00e0o s\u1ebd s\u1eed d\u1ee5ng CPU \u1edf th\u1eddi \u0111i\u1ec3m ti\u1ebfp theo. Linux s\u1eed d\u1ee5ng scheduler nh\u01b0 CFS (Completely Fair Scheduler) \u0111\u1ec3 ph\u00e2n ph\u1ed1i th\u1eddi gian CPU m\u1ed9t c\u00e1ch c\u00f4ng b\u1eb1ng gi\u1eefa c\u00e1c ti\u1ebfn tr\u00ecnh. Nh\u1edd c\u01a1 ch\u1ebf l\u1eadp l\u1ecbch th\u00f4ng minh, h\u1ec7 th\u1ed1ng v\u1eabn m\u01b0\u1ee3t m\u00e0 ngay c\u1ea3 khi c\u00f3 h\u00e0ng tr\u0103m t\u00e1c v\u1ee5 \u0111ang ho\u1ea1t \u0111\u1ed9ng song song.<\/li>\n\n\n\n<li><strong>Qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb (Memory Management): <\/strong>Kernel c\u1ea5p ph\u00e1t v\u00e0 thu h\u1ed3i v\u00f9ng nh\u1edb cho t\u1eebng ti\u1ebfn tr\u00ecnh, theo d\u00f5i b\u1ed9 nh\u1edb \u1ea3o, ph\u00e2n trang (paging) v\u00e0 \u0111\u1ea3m b\u1ea3o m\u1ed7i ti\u1ebfn tr\u00ecnh c\u00f3 kh\u00f4ng gian \u0111\u1ed9c l\u1eadp, kh\u00f4ng \u1ea3nh h\u01b0\u1edfng l\u1eabn nhau. Kernel s\u1eed d\u1ee5ng MMU (Memory Management Unit) c\u1ee7a CPU \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 gi\u1eefa \u0111\u1ecba ch\u1ec9 \u1ea3o (virtual address) v\u00e0 \u0111\u1ecba ch\u1ec9 v\u1eadt l\u00fd (physical address). \u0110i\u1ec1u n\u00e0y gi\u00fap h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh v\u00e0 tr\u00e1nh nhi\u1ec1u l\u1ed7i nghi\u00eam tr\u1ecdng.<\/li>\n\n\n\n<li><strong>Qu\u1ea3n l\u00fd thi\u1ebft b\u1ecb v\u00e0 I\/O: <\/strong>M\u1ecdi thao t\u00e1c \u0111\u1ecdc\/ghi v\u1edbi \u1ed5 c\u1ee9ng, b\u00e0n ph\u00edm, chu\u1ed9t, m\u1ea1ng, USB\u2026 \u0111\u1ec1u \u0111\u01b0\u1ee3c kernel \u0111i\u1ec1u ph\u1ed1i th\u00f4ng qua driver. Kernel t\u1ed1i \u01b0u h\u00f3a th\u1ee9 t\u1ef1 I\/O, s\u1eed d\u1ee5ng buffer, cache v\u00e0 th\u1ef1c thi song song \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t.<\/li>\n<\/ul>\n\n\n\n<p>B\u00ean c\u1ea1nh \u0111\u00f3, Linux kernel c\u00f2n x\u1eed l\u00fd ng\u1eaft (interrupt), qu\u1ea3n l\u00fd networking stack, x\u1eed l\u00fd IPC v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt th\u00f4ng qua vi\u1ec7c ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd quy\u1ec1n truy c\u1eadp t\u00e0i nguy\u00ean. T\u1ea5t c\u1ea3 nhi\u1ec7m v\u1ee5 n\u00e0y di\u1ec5n ra li\u00ean t\u1ee5c trong n\u1ec1n, t\u1ea1o n\u00ean m\u1ed9t h\u1ec7 th\u1ed1ng \u1ed5n \u0111\u1ecbnh, m\u1ea1nh m\u1ebd v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u lo\u1ea1i m\u00f4i tr\u01b0\u1eddng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-cac-thanh-ph\u1ea7n-c\u1ee7a-linux-kernel\"><span class=\"ez-toc-section\" id=\"Cac_thanh_phan_cua_Linux_Kernel\"><\/span><strong>C\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a Linux Kernel<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Qu\u1ea3n l\u00fd ti\u1ebfn tr\u00ecnh (Process Management): <\/strong>Th\u00e0nh ph\u1ea7n n\u00e0y ch\u1ecbu tr\u00e1ch nhi\u1ec7m t\u1ea1o, h\u1ee7y, theo d\u00f5i v\u00e0 l\u1eadp l\u1ecbch cho c\u00e1c ti\u1ebfn tr\u00ecnh. Kernel quy\u1ebft \u0111\u1ecbnh ti\u1ebfn tr\u00ecnh n\u00e0o \u0111\u01b0\u1ee3c ch\u1ea1y, khi n\u00e0o ch\u1ea1y v\u00e0 trong bao l\u00e2u, nh\u1eb1m \u0111\u1ea3m b\u1ea3o s\u1eed d\u1ee5ng CPU hi\u1ec7u qu\u1ea3 v\u00e0 ph\u1ea3n h\u1ed3i t\u1ed1t. Kernel c\u0169ng qu\u1ea3n l\u00fd threads (lu\u1ed3ng) v\u00e0 th\u1ef1c hi\u1ec7n context switching gi\u1eefa c\u00e1c ti\u1ebfn tr\u00ecnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111a nhi\u1ec7m m\u01b0\u1ee3t m\u00e0.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb (Memory Management): <\/strong>\u0110i\u1ec1u khi\u1ec3n c\u00e1ch RAM \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed5 cho ti\u1ebfn tr\u00ecnh, qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb \u1ea3o, paging, swapping v\u00e0 ph\u00e2n m\u1ea3nh b\u1ed9 nh\u1edb. Th\u00e0nh ph\u1ea7n n\u00e0y \u0111\u1ea3m b\u1ea3o m\u1ed7i ti\u1ebfn tr\u00ecnh c\u00f3 kh\u00f4ng gian nh\u1edb ri\u00eang, an to\u00e0n v\u00e0 t\u00e1ch bi\u1ec7t. Kernel c\u0169ng qu\u1ea3n l\u00fd memory mapping, page cache \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u n\u0103ng \u0111\u1ecdc\/ghi \u0111\u0129a.<\/li>\n\n\n\n<li><strong>H\u1ec7 th\u1ed1ng file (VFS &#8211; Virtual File System): <\/strong>Cung c\u1ea5p m\u1ed9t l\u1edbp tr\u1eebu t\u01b0\u1ee3ng cho vi\u1ec7c truy c\u1eadp t\u1ec7p. Nh\u1edd VFS, Linux h\u1ed7 tr\u1ee3 nhi\u1ec1u \u0111\u1ecbnh d\u1ea1ng file system kh\u00e1c nhau (ext4, XFS, btrfs\u2026) m\u00e0 \u1ee9ng d\u1ee5ng kh\u00f4ng c\u1ea7n quan t\u00e2m \u0111\u1ebfn chi ti\u1ebft t\u1eebng lo\u1ea1i. VFS t\u1ea1o ra m\u1ed9t interface th\u1ed1ng nh\u1ea5t, cho ph\u00e9p c\u00e1c \u1ee9ng d\u1ee5ng truy c\u1eadp file m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft file system c\u1ee5 th\u1ec3 \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/li>\n\n\n\n<li><strong>Qu\u1ea3n l\u00fd thi\u1ebft b\u1ecb v\u00e0 driver (Device Drivers): <\/strong>Kernel giao ti\u1ebfp v\u1edbi m\u1ecdi ph\u1ea7n c\u1ee9ng th\u00f4ng qua driver: \u1ed5 c\u1ee9ng, card m\u1ea1ng, USB, GPU, camera, b\u00e0n ph\u00edm\u2026 \u0110\u00e2y ch\u00ednh l\u00e0 \u201cc\u1ea7u n\u1ed1i\u201d gi\u1eefa ph\u1ea7n m\u1ec1m v\u00e0 ph\u1ea7n c\u1ee9ng. C\u00e1c driver c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p s\u1eb5n trong kernel (built-in) ho\u1eb7c \u0111\u01b0\u1ee3c n\u1ea1p \u0111\u1ed9ng nh\u01b0 kernel module.<\/li>\n\n\n\n<li><strong>H\u1ec7 th\u1ed1ng I\/O (Input\/Output Management): <\/strong>\u0110i\u1ec1u ph\u1ed1i d\u1eef li\u1ec7u v\u00e0o\u2013ra gi\u1eefa ti\u1ebfn tr\u00ecnh v\u00e0 thi\u1ebft b\u1ecb. Kernel t\u1ed1i \u01b0u th\u1ee9 t\u1ef1 \u0111\u1ecdc\/ghi, qu\u1ea3n l\u00fd buffer v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c thao t\u00e1c I\/O kh\u00f4ng l\u00e0m h\u1ec7 th\u1ed1ng b\u1ecb ngh\u1ebdn. Kernel s\u1eed d\u1ee5ng c\u01a1 ch\u1ebf interrupt-driven I\/O v\u00e0 DMA (Direct Memory Access) \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u n\u0103ng.<\/li>\n\n\n\n<li><strong>Networking Stack: <\/strong>To\u00e0n b\u1ed9 giao ti\u1ebfp m\u1ea1ng \u0111\u1ec1u \u0111\u01b0\u1ee3c x\u1eed l\u00fd t\u1ea1i \u0111\u00e2y t\u1eeb TCP\/IP stack, routing, firewall rules (iptables\/nftables) cho \u0111\u1ebfn c\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng hi\u1ec7n \u0111\u1ea1i. Kernel c\u0169ng x\u1eed l\u00fd netfilter framework \u0111\u1ec3 th\u1ef1c thi c\u00e1c quy t\u1eafc firewall v\u00e0 NAT. \u0110\u00e2y l\u00e0 l\u00fd do Linux l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho server v\u00e0 thi\u1ebft b\u1ecb m\u1ea1ng.<\/li>\n\n\n\n<li><strong>C\u01a1 ch\u1ebf Inter-process Communication (IPC): <\/strong>Cung c\u1ea5p c\u00e1c c\u01a1 ch\u1ebf \u0111\u1ec3 ti\u1ebfn tr\u00ecnh giao ti\u1ebfp v\u1edbi nhau: pipe, signal, message queue, shared memory\u2026 \u0111\u1ea3m b\u1ea3o \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 ph\u1ed1i h\u1ee3p v\u00e0 trao \u0111\u1ed5i d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-linux-kernel-d\u01b0\u1ee3c-s\u1eed-d\u1ee5ng-th\u1ebf-nao-trong-th\u1ef1c-t\u1ebf\"><span class=\"ez-toc-section\" id=\"Linux_Kernel_duoc_su_dung_the_nao_trong_thuc_te\"><\/span><strong>Linux Kernel \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u1ebf n\u00e0o trong th\u1ef1c t\u1ebf?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong th\u1ef1c t\u1ebf, Linux kernel \u0111\u00e3 tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng c\u1ed1t l\u00f5i \u0111\u1ee9ng sau ph\u1ea7n l\u1edbn h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i: t\u1eeb server, cloud, container, thi\u1ebft b\u1ecb IoT cho \u0111\u1ebfn smartphone Android:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tr\u00ean m\u00e1y ch\u1ee7 (server) v\u00e0 trung t\u00e2m d\u1eef li\u1ec7u:<\/strong> Linux \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 v\u1eadn h\u00e0nh web server, database, container runtime, hypervisor v\u00e0 c\u00e1c d\u1ecbch v\u1ee5 quan tr\u1ecdng c\u1ee7a h\u1ea1 t\u1ea7ng cloud. C\u00e1c b\u1ea3n ph\u00e2n ph\u1ed1i nh\u01b0 Ubuntu Server, Debian, Rocky Linux, AlmaLinux, RHEL hay Amazon Linux \u0111\u1ec1u x\u00e2y d\u1ef1ng tr\u1ef1c ti\u1ebfp t\u1eeb c\u00f9ng m\u1ed9t Linux kernel n\u1ec1n t\u1ea3ng.<\/li>\n\n\n\n<li><strong>Trong m\u1ea3ng thi\u1ebft b\u1ecb di \u0111\u1ed9ng:<\/strong> H\u00e0ng t\u1ef7 smartphone Android ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean Linux kernel, \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi ph\u1ea7n c\u1ee9ng v\u00e0 t\u00ednh n\u0103ng c\u1ee7a t\u1eebng d\u00f2ng m\u00e1y.&nbsp;<\/li>\n\n\n\n<li><strong>H\u1ec7 th\u1ed1ng nh\u00fang: <\/strong>Linux c\u0169ng l\u00e0 n\u1ec1n t\u1ea3ng c\u1ed1t l\u00f5i c\u1ee7a nhi\u1ec1u h\u1ec7 th\u1ed1ng nh\u00fang (embedded) nh\u01b0 router, smart TV, IoT, thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p v\u00e0 xe h\u01a1i.<\/li>\n\n\n\n<li><strong>Trong ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m:<\/strong> Linux kernel l\u00e0 m\u00f4i tr\u01b0\u1eddng l\u00fd t\u01b0\u1edfng \u0111\u1ec3 ch\u1ea1y container (Docker, Podman), orchestrator (Kubernetes), c\u0169ng nh\u01b0 c\u00e1c c\u00f4ng c\u1ee5 l\u1eadp tr\u00ecnh hi\u1ec7u n\u0103ng cao nh\u1edd ki\u1ebfn tr\u00fac \u1ed5n \u0111\u1ecbnh v\u00e0 h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean m\u1ea1nh m\u1ebd. Ph\u1ea7n l\u1edbn h\u1ec7 th\u1ed1ng backend hi\u1ec7n \u0111\u1ea1i tri\u1ec3n khai tr\u00ean cloud \u0111\u1ec1u d\u1ef1a tr\u00ean Linux v\u00ec t\u00ednh \u1ed5n \u0111\u1ecbnh, b\u1ea3o m\u1eadt v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng c\u1ee7a kernel.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-cac-l\u1ec7nh-c\u01a1-b\u1ea3n-d\u1ec3-lam-vi\u1ec7c-v\u1edbi-linux-kernel\"><span class=\"ez-toc-section\" id=\"Cac_lenh_co_ban_de_lam_viec_voi_Linux_kernel\"><\/span><strong>C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-hi\u1ec3n-th\u1ecb-phien-b\u1ea3n-kernel-hi\u1ec7n-t\u1ea1i\"><strong>Hi\u1ec3n th\u1ecb phi\u00ean b\u1ea3n kernel hi\u1ec7n t\u1ea1i<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111\u1ec3 xem h\u1ec7 th\u1ed1ng \u0111ang ch\u1ea1y kernel version n\u00e0o tr\u01b0\u1edbc khi c\u00e0i driver GPU, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>uname -r<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-hi\u1ec3n-th\u1ecb-d\u1ea7y-d\u1ee7-thong-tin-v\u1ec1-kernel-va-h\u1ec7-th\u1ed1ng\"><strong>Hi\u1ec3n th\u1ecb \u0111\u1ea7y \u0111\u1ee7 th\u00f4ng tin v\u1ec1 kernel v\u00e0 h\u1ec7 th\u1ed1ng<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111\u1ec3 xem ki\u1ebfn tr\u00fac CPU, hostname v\u00e0 b\u1ea3n build kernel khi c\u1ea7n debug l\u1ed7i h\u1ec7 th\u1ed1ng, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>uname -a<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-li\u1ec7t-ke-cac-kernel-module-dang-d\u01b0\u1ee3c-t\u1ea3i\"><strong>Li\u1ec7t k\u00ea c\u00e1c kernel module \u0111ang \u0111\u01b0\u1ee3c t\u1ea3i<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111\u1ec3 ki\u1ec3m tra driver c\u1ee7a card m\u1ea1ng \u0111\u00e3 \u0111\u01b0\u1ee3c kernel load hay ch\u01b0a, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>lsmod<\/code><\/pre>\n\n\n\n<p>N\u1ebfu module t\u01b0\u01a1ng \u1ee9ng kh\u00f4ng xu\u1ea5t hi\u1ec7n trong danh s\u00e1ch, c\u00f3 th\u1ec3 n\u00f3 ch\u01b0a \u0111\u01b0\u1ee3c n\u1ea1p ho\u1eb7c kernel kh\u00f4ng h\u1ed7 tr\u1ee3 ph\u1ea7n c\u1ee9ng \u0111\u00f3.<\/p>\n\n\n\n<p>Ho\u1eb7c \u0111\u1ec3 t\u00ecm module c\u1ee5 th\u1ec3:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>lsmod | grep &#91;t\u00ean_module]<\/code><\/pre>\n\n\n\n<p>Xem th\u00f4ng tin chi ti\u1ebft v\u1ec1 m\u1ed9t kernel module:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>modinfo &#91;t\u00ean_module]<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-n\u1ea1p-ho\u1eb7c-g\u1ee1-m\u1ed9t-kernel-module\"><strong>N\u1ea1p ho\u1eb7c g\u1ee1 m\u1ed9t kernel module<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111\u1ec3 n\u1ea1p module firewall <code>nf_conntrack<\/code> v\u00e0o kernel, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo modprobe nf_conntrack<\/code><\/pre>\n\n\n\n<p>Ho\u1eb7c \u0111\u1ec3 g\u1ee1 module \u0111\u00f3:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo modprobe -r nf_conntrack<\/code><\/pre>\n\n\n\n<p id=\"h-l\u01b0u-y-modprobe-t\u1ef1-d\u1ed9ng-gi\u1ea3i-quy\u1ebft-dependencies-cac-module-ph\u1ee5-thu\u1ed9c-con-insmod-rmmod-ch\u1ec9-n\u1ea1p-g\u1ee1-module-c\u1ee5-th\u1ec3-ma-khong-x\u1eed-ly-dependencies\">L\u01b0u \u00fd: <code>modprobe<\/code> t\u1ef1 \u0111\u1ed9ng gi\u1ea3i quy\u1ebft dependencies (c\u00e1c module ph\u1ee5 thu\u1ed9c), c\u00f2n <code>insmod<\/code>\/<code>rmmod<\/code> ch\u1ec9 n\u1ea1p\/g\u1ee1 module c\u1ee5 th\u1ec3 m\u00e0 kh\u00f4ng x\u1eed l\u00fd dependencies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-xem-log-kernel\"><strong>Xem log kernel<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 khi c\u1eafm USB v\u00e0o m\u00e1y v\u00e0 mu\u1ed1n xem kernel c\u00f3 nh\u1eadn thi\u1ebft b\u1ecb hay kh\u00f4ng, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>dmesg | tail<\/code><\/pre>\n\n\n\n<p>Kernel log lu\u00f4n ghi l\u1ea1i s\u1ef1 ki\u1ec7n ph\u1ea7n c\u1ee9ng v\u00e0 l\u1ed7i li\u00ean quan \u0111\u1ebfn driver, r\u1ea5t h\u1eefu \u00edch khi debug.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-xem-thong-tin-cpu-t\u1eeb-kernel\"><strong>Xem th\u00f4ng tin CPU t\u1eeb kernel<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 khi c\u1ea7n bi\u1ebft CPU c\u00f3 h\u1ed7 tr\u1ee3 \u1ea3o h\u00f3a ph\u1ea7n c\u1ee9ng (Intel VT-x ho\u1eb7c AMD-V) \u0111\u1ec3 c\u00e0i m\u00e1y \u1ea3o, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat \/proc\/cpuinfo<\/code><\/pre>\n\n\n\n<p>Kernel li\u1ec7t k\u00ea \u0111\u1ea7y \u0111\u1ee7 c\u00e1c flag CPU \u0111\u1ec3 ki\u1ec3m tra kh\u1ea3 n\u0103ng ph\u1ea7n c\u1ee9ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-xem-thong-tin-b\u1ed9-nh\u1edb-do-kernel-qu\u1ea3n-ly\"><strong>Xem th\u00f4ng tin b\u1ed9 nh\u1edb do kernel qu\u1ea3n l\u00fd<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 \u0111\u1ec3 ki\u1ec3m tra l\u01b0\u1ee3ng RAM \u0111ang tr\u1ed1ng ho\u1eb7c l\u01b0\u1ee3ng swap \u0111\u00e3 d\u00f9ng, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat \/proc\/meminfo<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-theo-doi-ti\u1ebfn-trinh-va-m\u1ee9c-s\u1eed-d\u1ee5ng-tai-nguyen-theo-th\u1eddi-gian-th\u1ef1c\"><strong>Theo d\u00f5i ti\u1ebfn tr\u00ecnh v\u00e0 m\u1ee9c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean theo th\u1eddi gian th\u1ef1c<\/strong><\/h3>\n\n\n\n<p>V\u00ed d\u1ee5 khi h\u1ec7 th\u1ed1ng b\u1ecb ch\u1eadm v\u00e0 mu\u1ed1n xem ti\u1ebfn tr\u00ecnh n\u00e0o chi\u1ebfm CPU cao, ta d\u00f9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>top<\/code><\/pre>\n\n\n\n<p>Ho\u1eb7c phi\u00ean b\u1ea3n tr\u1ef1c quan h\u01a1n:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>htop<\/code><\/pre>\n\n\n\n<p>Hai l\u1ec7nh n\u00e0y cho th\u1ea5y c\u00e1ch kernel ph\u00e2n ph\u1ed1i t\u00e0i nguy\u00ean v\u00e0 ti\u1ebfn tr\u00ecnh n\u00e0o \u0111ang chi\u1ebfm t\u1ea3i nhi\u1ec1u nh\u1ea5t.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-cau-h\u1ecfi-th\u01b0\u1eddng-g\u1eb7p-v\u1ec1-linux-kernel\"><span class=\"ez-toc-section\" id=\"Cau_hoi_thuong_gap_ve_Linux_kernel\"><\/span><strong>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 Linux kernel<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-linux-kernel-co-ph\u1ea3i-la-h\u1ec7-di\u1ec1u-hanh-khong\"><strong>Linux kernel c\u00f3 ph\u1ea3i l\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh kh\u00f4ng?<\/strong><\/h3>\n\n\n\n<p>Kh\u00f4ng. Linux kernel ch\u1ec9 l\u00e0 ph\u1ea7n l\u00f5i c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh, c\u00f3 vai tr\u00f2 qu\u1ea3n l\u00fd ph\u1ea7n c\u1ee9ng, t\u00e0i nguy\u00ean v\u00e0 cung c\u1ea5p c\u00e1c c\u01a1 ch\u1ebf nh\u01b0 process, memory, I\/O, file system\u2026 C\u00e1c b\u1ea3n ph\u00e2n ph\u1ed1i nh\u01b0 Ubuntu, Fedora hay Debian m\u1edbi l\u00e0 \u201ch\u1ec7 \u0111i\u1ec1u h\u00e0nh ho\u00e0n ch\u1ec9nh\u201d, v\u00ec ch\u00fang g\u1ed3m kernel + GNU tools th\u01b0 vi\u1ec7n + c\u00f4ng c\u1ee5 + \u1ee9ng d\u1ee5ng.<\/p>\n\n\n\n<p>Nhi\u1ec1u ng\u01b0\u1eddi th\u01b0\u1eddng g\u1ecdi \u0111\u00fang l\u00e0 &#8220;GNU\/Linux&#8221; \u0111\u1ec3 c\u00f4ng nh\u1eadn vai tr\u00f2 c\u1ee7a c\u1ea3 kernel Linux v\u00e0 c\u00e1c c\u00f4ng c\u1ee5 GNU trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-kernel-co-\u1ea3nh-h\u01b0\u1edfng-d\u1ebfn-hi\u1ec7u-nang\"><strong>Kernel c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u n\u0103ng?<\/strong><\/h3>\n\n\n\n<p>C\u00f3. Kernel quy\u1ebft \u0111\u1ecbnh c\u00e1ch CPU \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1, c\u00e1ch b\u1ed9 nh\u1edb \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd, c\u00e1ch I\/O \u0111\u01b0\u1ee3c x\u1eed l\u00fd v\u00e0 c\u00e1ch driver giao ti\u1ebfp v\u1edbi ph\u1ea7n c\u1ee9ng. M\u1ed9t kernel t\u1ed1i \u01b0u ho\u1eb7c ph\u00f9 h\u1ee3p v\u1edbi ph\u1ea7n c\u1ee9ng s\u1ebd gi\u00fap h\u1ec7 th\u1ed1ng ch\u1ea1y m\u01b0\u1ee3t, gi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 c\u1ea3i thi\u1ec7n throughput.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5, kernel m\u1edbi h\u01a1n th\u01b0\u1eddng c\u00f3 scheduler t\u1ed1t h\u01a1n, c\u1ea3i thi\u1ec7n qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb, v\u00e0 h\u1ed7 tr\u1ee3 t\u00ednh n\u0103ng ph\u1ea7n c\u1ee9ng m\u1edbi nh\u01b0 NVMe, USB 3.0+.<\/p>\n\n\n\n<p>Ng\u01b0\u1ee3c l\u1ea1i, driver l\u1ed7i th\u1eddi ho\u1eb7c kernel qu\u00e1 c\u0169 c\u00f3 th\u1ec3 khi\u1ebfn h\u1ec7 th\u1ed1ng ch\u1eadm ho\u1eb7c kh\u00f4ng \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-co-th\u1ec3-t\u1ef1-bien-d\u1ecbch-kernel-khong\"><strong>C\u00f3 th\u1ec3 t\u1ef1 bi\u00ean d\u1ecbch kernel kh\u00f4ng?<\/strong><\/h3>\n\n\n\n<p>C\u00f3. Linux cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u1ef1 bi\u00ean d\u1ecbch (compile) kernel theo nhu c\u1ea7u ri\u00eang, nh\u01b0 th\u00eam\/b\u1edbt driver, k\u00edch ho\u1ea1t t\u00ednh n\u0103ng \u0111\u1eb7c bi\u1ec7t, t\u1ed1i \u01b0u k\u00edch th\u01b0\u1edbc ho\u1eb7c tinh ch\u1ec9nh hi\u1ec7u n\u0103ng. Qu\u00e1 tr\u00ecnh bi\u00ean d\u1ecbch th\u01b0\u1eddng bao g\u1ed3m:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u1ea5u h\u00ecnh kernel (make menuconfig)<\/li>\n\n\n\n<li>Bi\u00ean d\u1ecbch (make)<\/li>\n\n\n\n<li>C\u00e0i \u0111\u1eb7t modules (make modules_install)<\/li>\n\n\n\n<li>C\u1eadp nh\u1eadt bootloader.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Tuy nhi\u00ean, vi\u1ec7c bi\u00ean d\u1ecbch \u0111\u00f2i h\u1ecfi b\u1ea1n c\u1ea7n c\u00f3 hi\u1ec3u bi\u1ebft nh\u1ea5t \u0111\u1ecbnh v\u1ec1 kernel v\u00e0 \u0111i k\u00e8m nhi\u1ec1u r\u1ee7i ro n\u1ebfu c\u1ea5u h\u00ecnh sai. Ngo\u00e0i ra, sau khi bi\u00ean d\u1ecbch kernel m\u1edbi, b\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n bi\u00ean d\u1ecbch l\u1ea1i c\u00e1c kernel module ngo\u00e0i (nh\u01b0 driver NVIDIA, VirtualBox kernel modules) \u0111\u1ec3 t\u01b0\u01a1ng th\u00edch.&nbsp;<\/p>\n\n\n\n<p>Trong th\u1ef1c t\u1ebf, ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi l\u00e0m h\u1ec7 th\u1ed1ng, nh\u00fang ho\u1eb7c t\u1ed1i \u01b0u kernel m\u1edbi c\u1ea7n compile th\u1ee7 c\u00f4ng. H\u1ea7u h\u1ebft ng\u01b0\u1eddi d\u00f9ng n\u00ean s\u1eed d\u1ee5ng kernel t\u1eeb b\u1ea3n ph\u00e2n ph\u1ed1i v\u00ec \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u00e0 t\u1ed1i \u01b0u s\u1eb5n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-s\u1ef1-khac-nhau-gi\u1eefa-kernel-lts-va-kernel-m\u1edbi-nh\u1ea5t-mainline-la-gi\"><strong>S\u1ef1 kh\u00e1c nhau gi\u1eefa kernel LTS v\u00e0 kernel m\u1edbi nh\u1ea5t (mainline) l\u00e0 g\u00ec?<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LTS (Long-Term Support)<\/strong>: \u01b0u ti\u00ean \u1ed5n \u0111\u1ecbnh v\u00e0 b\u1ea3o m\u1eadt, \u00edt thay \u0111\u1ed5i l\u1edbn \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1ea3o m\u1eadt trong 6 n\u0103m, ph\u00f9 h\u1ee3p server, cloud, doanh nghi\u1ec7p. V\u00ed d\u1ee5: Linux 6.1 LTS, Linux 5.15 LTS.<\/li>\n\n\n\n<li><strong>Kernel mainline (m\u1edbi nh\u1ea5t):<\/strong> nhi\u1ec1u t\u00ednh n\u0103ng m\u1edbi, c\u1ea3i ti\u1ebfn hi\u1ec7u n\u0103ng, nh\u01b0ng c\u00f3 th\u1ec3 ch\u01b0a ho\u00e0n thi\u1ec7n, ch\u1ec9 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 cho \u0111\u1ebfn khi phi\u00ean b\u1ea3n ti\u1ebfp theo ra m\u1eaft, ph\u00f9 h\u1ee3p v\u1edbi nh\u00e0 ph\u00e1t tri\u1ec3n kernel ho\u1eb7c ng\u01b0\u1eddi c\u1ea7n th\u1eed t\u00ednh n\u0103ng m\u1edbi.<\/li>\n\n\n\n<li><strong>Kernel stable:<\/strong> l\u00e0 c\u00e1c b\u1ea3n ph\u00e1t h\u00e0nh \u0111\u01b0\u1ee3c ch\u1ecdn l\u1ecdc t\u1eeb mainline v\u00e0 ti\u1ebfp t\u1ee5c nh\u1eadn backport c\u00e1c b\u1ea3n v\u00e1 l\u1ed7i v\u00e0 b\u1ea3o m\u1eadt, th\u01b0\u1eddng \u0111\u01b0\u1ee3c c\u00e1c b\u1ea3n ph\u00e2n ph\u1ed1i Linux s\u1eed d\u1ee5ng l\u00e0m n\u1ec1n t\u1ea3ng, c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh n\u0103ng m\u1edbi v\u00e0 \u1ed5n \u0111\u1ecbnh.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-kernel-module-khac-gi-so-v\u1edbi-driver\"><strong>Kernel module kh\u00e1c g\u00ec so v\u1edbi driver?<\/strong><\/h3>\n\n\n\n<p>Driver l\u00e0 m\u1ed9t lo\u1ea1i kernel module chuy\u00ean \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n ph\u1ea7n c\u1ee9ng. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i module n\u00e0o c\u0169ng l\u00e0 driver, nhi\u1ec1u module ch\u1ec9 b\u1ed5 sung t\u00ednh n\u0103ng m\u1edbi cho kernel nh\u01b0 firewall (nf_conntrack, iptable_filter), h\u1ec7 th\u1ed1ng file (ext4, btrfs), thu\u1eadt to\u00e1n n\u00e9n (zlib), ho\u1eb7c network protocol (ipv6).<\/p>\n\n\n\n<p>T\u00f3m l\u1ea1i, t\u1ea5t c\u1ea3 driver \u0111\u1ec1u l\u00e0 kernel module, nh\u01b0ng kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 kernel module \u0111\u1ec1u l\u00e0 driver.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-t\u1ed5ng-k\u1ebft\"><span class=\"ez-toc-section\" id=\"Tong_ket\"><\/span><strong>T\u1ed5ng k\u1ebft<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Linux kernel c\u00f3 ki\u1ebfn tr\u00fac v\u00e0 ho\u1ea1t \u0111\u1ed9ng ph\u1ee9c t\u1ea1p \u1edf t\u1ea7ng b\u00ean trong, nh\u01b0ng khi hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1ch kernel v\u1eadn h\u00e0nh, t\u1eeb ki\u1ebfn tr\u00fac monolithic, m\u00f4 h\u00ecnh ph\u00e2n t\u00e1ch kernel space \u2013 user space, cho \u0111\u1ebfn c\u00e1c c\u01a1 ch\u1ebf qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean c\u1ed1t l\u00f5i, b\u1ea1n s\u1ebd ch\u1ee7 \u0111\u1ed9ng h\u01a1n trong vi\u1ec7c s\u1eed d\u1ee5ng, t\u1ed1i \u01b0u v\u00e0 x\u1eed l\u00fd s\u1ef1 c\u1ed1 tr\u00ean h\u1ec7 th\u1ed1ng. ITviec tin r\u1eb1ng c\u00e1c ki\u1ec3n th\u1ee9c tr\u00ean l\u00e0 n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c v\u1eefng ch\u1eafc cho b\u1ea5t k\u1ef3 ai mu\u1ed1n l\u00e0m vi\u1ec7c v\u1edbi Linux.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux kernel l\u00e0 ph\u1ea7n c\u1ed1t l\u00f5i bi\u1ebfn Linux tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng \u0111\u00e1ng tin c\u1eady cho server, cloud, container, thi\u1ebft b\u1ecb nh\u00fang v\u00e0 v\u00f4 s\u1ed1 h\u1ec7 th\u1ed1ng h\u1ea1 t\u1ea7ng quan tr\u1ecdng tr\u00ean to\u00e0n th\u1ebf gi\u1edbi. D\u00f9 kh\u00f4ng tr\u1ef1c ti\u1ebfp nh\u00ecn th\u1ea5y, kernel l\u1ea1i l\u00e0 th\u00e0nh ph\u1ea7n quy\u1ebft \u0111\u1ecbnh c\u00e1ch ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m ph\u1ed1i [&hellip;]<\/p>\n","protected":false},"author":209,"featured_media":95509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109],"tags":[],"class_list":["post-94485","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Linux Kernel l\u00e0 g\u00ec: C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel - ITviec Blog<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng Linux kernel k\u00e8m v\u00ed d\u1ee5 th\u1ef1c t\u1ebf t\u1eeb kernel l\u00e0m g\u00ec, kh\u00e1c g\u00ec user space v\u00e0 c\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 theo d\u00f5i kernel.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux Kernel l\u00e0 g\u00ec: C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel\" \/>\n<meta property=\"og:description\" content=\"Linux kernel l\u00e0 ph\u1ea7n c\u1ed1t l\u00f5i bi\u1ebfn Linux tr\u1edf th\u00e0nh n\u1ec1n t\u1ea3ng \u0111\u00e1ng tin c\u1eady cho server, cloud, container, thi\u1ebft b\u1ecb nh\u00fang v\u00e0 v\u00f4 s\u1ed1 h\u1ec7 th\u1ed1ng h\u1ea1 t\u1ea7ng quan tr\u1ecdng\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itviec.com\/blog\/linux-kernel-la-gi\/\" \/>\n<meta property=\"og:site_name\" content=\"ITviec Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ITviec\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-12T11:30:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-12T11:30:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2026\/04\/linux-kernel-scaled.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"421\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"M\u1ef9 Duy\u00ean\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ITviec\" \/>\n<meta name=\"twitter:site\" content=\"@ITviec\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"M\u1ef9 Duy\u00ean\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"16 ph\u00fat\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Linux Kernel l\u00e0 g\u00ec: C\u00e1c l\u1ec7nh c\u01a1 b\u1ea3n \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi Linux kernel - 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