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一文读懂缺页中断:Linux内存按需干活机制

  • 2026-08-19 07:07:34
一文读懂缺页中断:Linux内存按需干活机制

前面我们讲完了伙伴系统、Slab 分配器、虚拟与物理内存，很多人会有一个疑问：为什么程序 malloc 申请内存后，系统不会立刻占用物理内存，只有读写时内存才真正被占用？答案，就是今天的主角 —— 缺页中断（Page Fault）。它是 Linux 内存"懒惰机制"的核心，也是操...

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  4. 会话信息 : SESSION_ID=96145c76b8d51214d14302edcfa7ef88
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  1. CONNECT:[ UseTime:0.001159s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001723s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000691s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000671s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001342s ]
  6. SELECT * FROM `set` [ RunTime:0.002513s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001730s ]
  8. SELECT * FROM `article` WHERE `id` = 510672 LIMIT 1 [ RunTime:0.001092s ]
  9. UPDATE `article` SET `lasttime` = 1787294463 WHERE `id` = 510672 [ RunTime:0.036329s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000601s ]
  11. SELECT * FROM `article` WHERE `id` < 510672 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001081s ]
  12. SELECT * FROM `article` WHERE `id` > 510672 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001132s ]
  13. SELECT * FROM `article` WHERE `id` < 510672 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002012s ]
  14. SELECT * FROM `article` WHERE `id` < 510672 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006482s ]
  15. SELECT * FROM `article` WHERE `id` < 510672 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002411s ]
0.264213s