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Linux 必学目录:/sys/module

  • 2026-02-27 20:14:43
Linux 必学目录:/sys/module
大家好!我是大虫子🐛!
继续 /sys 目录,这次分享的是 /sys/module 目录~
/sys/module 目录是 Linux 系统中的一个重要部分,它提供了关于内核模块的信息。内核模块是可加载的代码段,允许动态扩展内核功能而无需重新编译或重启系统。通过 /sys/module 目录,用户和开发者可以查看和管理当前加载的内核模块及其相关信息。
目录结构
该目录包含以已加载模块名称命名的子目录,每个子目录都代表一个内核模块,并包含该模块的相关信息。这些子目录通常包括以下几个文件和子目录:
1. 模块名称子目录
每个已加载的内核模块都有一个对应的目录,名称与模块相同。例如,如果加载了名为 nvidia 的模块,那么将有一个 /sys/module/nvidia 目录。
2. /sys/module/<module_name>/parameters
描述: 这个目录包含模块参数的信息。某些模块在加载时可以接受参数以修改其行为。
内容: 每个参数通常是一个文件,文件名为参数名称,文件内容表示当前参数值。
使用示例:
cat /sys/module/<module_name>/parameters/<parameter_name>
3. /sys/module/<module_name>/taint
描述: 此文件指示内核模块是否导致内核进入“污染”状态。污染状态通常表明内核正在运行非开源或不受支持的代码。
内容: 通常是一个数字,表示污染类型。
4. /sys/module/<module_name>/initstate
描述: 此文件指示模块的初始化状态。
内容: 内容可能是 live、unloading 或 dead,分别表示模块处于活动、卸载或未加载状态。
5. /sys/module/<module_name>/refcnt
描述: 表示当前引用计数,即有多少个进程或其他模块正在使用该模块。
内容: 一个整数值,指示引用计数。
关键功能和用途
1. 查看已加载模块:
  • 通过检查 `/sys/module` 目录,用户可以快速查看所有已加载的内核模块,了解系统的当前状态。
2. 管理模块参数:
  • 用户可以访问模块参数以调整模块行为。通过修改这些参数,可以优化性能或启用/禁用特定功能。
3. 调试和故障排除:
  • 在进行系统调试时,查看模块的状态、引用计数和污染状态可以帮助定位问题。
4. 开发和测试:
  • 开发人员可以利用此目录中的信息来测试和验证新开发的内核模块,确保它们正确加载并按预期工作。
实际应用
1. 动态模块管理:
  • 使用 modprobe、insmod 和 rmmod 命令管理模块时,可以通过 /sys/module 验证模块的加载和状态。
2. 性能调优:
  • 通过调整模块参数,如网络驱动程序的缓冲区大小,可以提高系统性能。
3. 安全审计:
  • 检查模块的污染状态可以帮助管理员识别潜在的安全风险,确保系统运行在安全的内核环境中。

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  1. CONNECT:[ UseTime:0.000925s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001375s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000686s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000674s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001300s ]
  6. SELECT * FROM `set` [ RunTime:0.000593s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001416s ]
  8. SELECT * FROM `article` WHERE `id` = 475718 LIMIT 1 [ RunTime:0.001071s ]
  9. UPDATE `article` SET `lasttime` = 1772278890 WHERE `id` = 475718 [ RunTime:0.001429s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000678s ]
  11. SELECT * FROM `article` WHERE `id` < 475718 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001176s ]
  12. SELECT * FROM `article` WHERE `id` > 475718 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001175s ]
  13. SELECT * FROM `article` WHERE `id` < 475718 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002175s ]
  14. SELECT * FROM `article` WHERE `id` < 475718 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002487s ]
  15. SELECT * FROM `article` WHERE `id` < 475718 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002457s ]
0.124210s