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新特性!支持 Linux 内核 IO 全栈观测

  • 2026-01-10 07:00:25
新特性!支持 Linux 内核 IO 全栈观测

本篇重点介绍 HUATUO 强悍的 IO 全栈观测能力,实现原理以及故障定位案例。

用户痛点

磁盘被打爆,却找不到罪魁祸首。深夜,监控系统突然报警: 磁盘 IOPS 爆表,磁盘利用率达到 100%!业务响应超时 …

紧急登录服务器,使用各种 IO 工具,试图找出元凶,却:

  1. 能看到某个进程在触发 IO 操作,却不知道它具体在读写哪个文件
  2. 能看到磁盘在疯狂写入,却不知道这些 IO 来自哪个业务进程
  3. 能看到内核线程在刷脏页,却根本无法追踪到原始的业务进程
  4. 能看到 IO 吞吐量,却不知道这些 IO 的延迟情况,无法定位性能瓶颈

能全景的分析 “是谁在写”、“写到哪里”、“为什么慢”。排查陷入僵局,业务继续受影响…

解决方案

iotracing 来了!这是一款基于 eBPF 技术的 IO 追踪工具,能够让你一步到位找到高 IO 的所有信息:

  • IO 属于哪个进程,支持 PID 和进程名
  • IO 属于哪个容器,支持容器化环境
  • IO 写到哪个磁盘,支持设备号
  • IO 写到哪个文件,支持完整文件路径和 inode 号
  • IO 延迟分析,支持 q2c、d2c 延迟,找出性能瓶颈
  • 刷脏回写追踪,即使内核线程刷脏页,也能追溯到原始进程
  • 高延迟调用栈,捕获超过阈值的 IO,显示完整内核调用栈

基础用法

1. 快速上手

输出进程按照磁盘IO量排序,mysql 进程是最大的 IO 消耗者,每秒读取 5.2GB、写入 1.8GB!

2. 深入分析

此外,该工具还会输出读写文件信息:

这里展示了进程操作的文件,可以看到 MySQL 正在疯狂读写 ibdata1、 ib_logfile0、table1.ibd。延迟 q2c,d2c 信息一目了然。

3. 容器环境

识别 IO 来自哪个容器。在容器环境,iotracing 还能显示容器信息 container_hostname :

4. 回写 IO 追踪

普通的工具只能抓到一堆内核线程kworker在刷脏页,无法定位到io具体来源的业务进程。

iotracing 不仅准确识别到回写io的来源进程,更是精准定位到了io所属的文件。

高级用法

你一定遇到过这样的场景:

  • 凌晨监控告警:某台服务器磁盘 IO 突然飙升到 100%,持续 30 秒后自动恢复
  • 业务影响:这 30 秒内,数据库查询超时,用户请求失败率飙升
  • 排查困境:等你收到告警并登录服务器时,IO 已经恢复正常了。你不知道刚才发生了什么,更不知道如何复现

这是典型的突发 IO 问题:突发大量的 IO 请求,持续时间短,但影响严重!HUATUO autotracing 框架搭配 iotracing 可以实时监控的 IO 负载,当出现异常突增或者延迟异常时,会自动调用 iotracing 抓取磁盘快照,以供后续的问题根因分析。

生产环境案例

下面以一个真实的案例来看  iotracing 在服务器 IO 异常突增的场景发挥的作用。

HUATUO 观测到服务器在 17:50 左右发生一次大量读磁盘请求。

技术原理

iotracing 实现原理核心架构如下图:

总结

HUATUO iotracing 将打造 IO 性能分析的终极工具,未来开放更多特性。


篇尾:

  • HUATUO(华佗)是由滴滴开源并依托 CCF 孵化的操作系统深度可观测项目。
  • 关注微信公众号,或扫码加微信,邀请你加入用户群(请备注姓名+单位):
  • 仓库1:https://github.com/ccfos/huatuo
  • 仓库2:https://gitlink.org.cn/ccfos/huatuo
  • 官网:https://huatuo.tech/

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  1. CONNECT:[ UseTime:0.000995s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001493s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003065s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000634s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001312s ]
  6. SELECT * FROM `set` [ RunTime:0.000537s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001538s ]
  8. SELECT * FROM `article` WHERE `id` = 460783 LIMIT 1 [ RunTime:0.006833s ]
  9. UPDATE `article` SET `lasttime` = 1770569004 WHERE `id` = 460783 [ RunTime:0.011437s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.002091s ]
  11. SELECT * FROM `article` WHERE `id` < 460783 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001201s ]
  12. SELECT * FROM `article` WHERE `id` > 460783 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001118s ]
  13. SELECT * FROM `article` WHERE `id` < 460783 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002523s ]
  14. SELECT * FROM `article` WHERE `id` < 460783 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008841s ]
  15. SELECT * FROM `article` WHERE `id` < 460783 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014333s ]
0.223672s