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ebpf检测Linux系统要来了

  • 2026-01-23 09:13:49
ebpf检测Linux系统要来了

哈喽,我是子牙老师,一个手写过操作系统、编程语言、Java虚拟机、docker、Ubuntu系统,玩透Windows内核、Linux内核…立志一统计算机底层培训的硬核男人

前些日子不是做了个课程《手写生产级ebpf内存监测工具》吗,招生结束后,我一边交付课程,一边在思考大家在学习或工作过程中,还有哪些需求没有被满足,我试着用ebpf去解决

这我还没想出来多少,报名的小伙伴,还有咨询课程的小伙伴,提供了一堆的需求,我整理了一下,多达17个!我突然意识到:我不应该把这个工具局限于只做内存监测,而是定位于Linux系统检测更合适!

看到这些需求,只有一个感觉:兴奋!

以我这急性子,马上开干!花了两天时间,终于把第一个需求干出来了:支持监测fork创建的子进程的内存泄漏问题。没干之前,觉得应该挺简单吧,开干以后,小样还挺复杂的

总结一下实现监测fork子进程内存泄漏,折腾了哪些:

  1. Ringbuffer是生产-消费模型,进程间消费会相互影响,要解决
  2. 如何解决呢?实现本地化日志功能
  3. 本地化日志需要用到数据结构,得引入数据结构库
  4. 底层数据模块更改,相关的命令都要更改:log、leak、stack
  5. 加入异步日志同步模块,解决手动去ebpf端拉日志的麻烦
  6. fork会产生子进程,找准时机attach,找准时机创建dwfl对象
  7. fork会导致父进程内存变动,需要在合适时机更新dwfl对象
  8. 解决父子进程符号化调用栈的问题
  9. 支持无限fork

看下代码日志(写完的那一刻,太痛快了!)

看着自己写的工具越来越强大,很开心!人生的很多可能性,都是在不经意间来到的。我今天做了这样一件事情,不知未来会给我带来怎样的机缘呢?

那些觉得AI无所不能从而放弃自我成长的人,不妨看看借助AI能不能把这个需求搞出来

AI只是工具,牛叉的人,配上AI赋能,才会更强大!修内功,才能成为技术大佬,才能最大化使用AI这个强大的工具!

接下来展示给大家看一下工具的监测效果

一层fork,这是代码。父进程申请101B的内存不释放,子进程申请128B的内存不释放

开始用我写的工具yatrace监测。监测到两条malloc日志

run这一步的背后,实际上做了很多很多事情!比如:自动attach子进程、自动创建dwfl对象与子进程关联、刷新父进程的dwfl对象,这几件事情都不是简单就能做到的!

再来看看内存泄漏日志,精确到具体代码位置

肿么样?还是很酷的吧!这些都是基于ebpf技术实现的!我演示的一切,都是课程《手写生产级ebpf内存监测工具》中的

再来看无限fork,这个更酷!与刚刚代码不同的是,子进程又创建了子进程

看下监测到的日志。内存泄漏日志我就不贴图了

如果你:听说过eBPF很厉害,却陷在零散资料里无法系统入门;kprobe/tracepoint语法背了不少,实战中却连简单的追踪工具都写不出来;线上服务CPU突然飙升?不知道根源在哪,只能盲目重启;IO延迟居高不下?靠监控面板猜问题,找不到核心瓶颈;会用tcpdump、bpftrace排查网络问题,却想自定义监测维度时毫无头绪;想靠技术突破薪资瓶颈,却缺一门能落地的工程化实战技能…那你一定要了解这门课

ebpf几乎可以做一切你想做的检测:用户态检测+内核态检测。用户态包括检测:系统内存、自实现内存池、glibc路、MySQL、Redis、jvm、docker、自编写的程序…内核态包括检测:CPU、调度、上下文、内存、网络socket、网络协议、IO…你能想到的,它几乎都能做,非常有前途的技术!

当前购买这个课程,价格最低!性价比最高!后面会根据完成这些需求花费的时间与精力重新定价

对课程感兴趣的小伙伴可以找班主任领取20优惠券

除了这个小课,我还做了很多全网唯一的小课


以后再也不用gdb了

2025-10-14

实战Linux内核四期招生

2025-09-02

手写了一个JVM,计算机的底层原理悟了!

2024-04-18

手写docker,遥遥领先

2024-08-04

圆梦,手写编程语言

2025-05-20

点个在看你最好看

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  1. CONNECT:[ UseTime:0.005319s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001055s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000413s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000357s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000854s ]
  6. SELECT * FROM `set` [ RunTime:0.006336s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 463349 LIMIT 1 [ RunTime:0.005556s ]
  9. UPDATE `article` SET `lasttime` = 1770550450 WHERE `id` = 463349 [ RunTime:0.000812s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000272s ]
  11. SELECT * FROM `article` WHERE `id` < 463349 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007575s ]
  12. SELECT * FROM `article` WHERE `id` > 463349 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000397s ]
  13. SELECT * FROM `article` WHERE `id` < 463349 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001071s ]
  14. SELECT * FROM `article` WHERE `id` < 463349 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012168s ]
  15. SELECT * FROM `article` WHERE `id` < 463349 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000750s ]
0.147236s