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Linux调度类解读

  • 2026-08-18 23:10:43
Linux调度类解读

Linux调度类解读

  • • 本文档以linux内核6.15-rc3作为源码基线。
  • • 在上一篇文章中,通过pick_next_task函数解读,已经看到了调用pick_next_task_fair回调函数,就涉及到了具体的调度类,具体来说,pick_next_task_fair就是CFS函数的pick函数实现。因此,本篇文章就先解读Linux的调度类,这样能够更好的理解后续的流程。

调度类分层

  • • kernel/sched/core.c文件中,是调度器的入口,内核其他模块需要进行调度时,调用的都是这个文件中定义的入口函数,比如最典型的就是schedule函数。
  • • 当我们看到pick_next_task_fair的具体实现时,就已经到了kernel/sched/fair.c文件中定义了,这就是通常我们所说的CFS(Complete Fair Scheduler,完全公平调度器)的具体实现了。CFS,我们就称之为一个调度类。
  • • 反过来说,一个好的设计,肯定是能够兼容多种不同的需求。而调度器正好是这一需求的最好反应,不同的任务有不同的需求。典型的比如:火箭点火控制,这个肯定是要求实时的,那必须有对应的试试调度类;同时多任务并行,那肯定都需要照顾,稍微晚一点也没有问题;而后台日志处理任务,晚上晚个一两个小时也没什么问题,那就肯定不需要特殊照顾。因此,就需要把调度器的入口和调度器的实现分离,进行解耦,我们才能通过多种调度类来支持多种不同的调度需求。
  • • 因此,我们可以简单的总结如下:
SCHED_CORE
SCHED_CLASS

调度类数据结构

  • • 既然已经涉及了调度类分层的设计原理,那用什么数据结构来对调度类进行抽象呢?怎么定义各个调度类呢?
  • • Linux内核中对调度类进行抽象的数据结构是struct sched_class, 定义在kernel/sched/sched.h头文件第2364行,定义如下:
struct sched_class {
    ....
    void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
    bool (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
    void (*yield_task)   (struct rq *rq);
    bool (*yield_to_task)(struct rq *rq, struct task_struct *p);

    void (*wakeup_preempt)(struct rq *rq, struct task_struct *p, int flags);

    int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
    struct task_struct *(*pick_task)(struct rq *rq);
    /*
     * Optional! When implemented pick_next_task() should be equivalent to:
     *
     *   next = pick_task();
     *   if (next) {
     *       put_prev_task(prev);
     *       set_next_task_first(next);
     *   }
     */
    struct task_struct *(*pick_next_task)(struct rq *rq, struct task_struct *prev);

    void (*put_prev_task)(struct rq *rq, struct task_struct *p, struct task_struct *next);
    void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);
    ....
};
  • • 这个调度类定义了很多如入队、出队、放弃CPU等回调函数钩子,这其实就是对应的调度器的入口函数的对应调度类需要实现的函数,里面就包含了前面文章中涉及的pick_next_task函数;

调度类定义

  • • 由于Linux内核调度类是核心数据结构,因此对于一个调度类的定义是有限制的,那么怎么保证每个调度类都是符合这个限制要求的呢?Linux内核在kernel/sched/sched.h文件第2485行定义了DEFINE_SCHED_CLASS这个辅助宏,保证符合相关限制要求。
/*
 * Helper to define a sched_class instance; each one is placed in a separate
 * section which is ordered by the linker script:
 *
 *   include/asm-generic/vmlinux.lds.h
 *
 * *CAREFUL* they are laid out in *REVERSE* order!!!
 *
 * Also enforce alignment on the instance, not the type, to guarantee layout.
 */
#define DEFINE_SCHED_CLASS(name) \
const struct sched_class name##_sched_class \
    __aligned(__alignof__(struct sched_class)) \
    __section("__" #name "_sched_class")
  • • 从这个宏定义可以看到,具体的就是需要按照结构体对齐,并放到对应的section中

详细调度类

• 全局搜索DEFINE_SCHED_CLASS引用,具体如下:
  • • 可以看到,在6个文件中分别进行了引用,这实际上也就对应了Linux内核中的6个调度类,分别是deadline,ext,fair(也就是通常所说的CFS),idle,rt和stop。分别如下:
DEFINE_SCHED_CLASS(dl)
DEFINE_SCHED_CLASS(ext)
DEFINE_SCHED_CLASS(fair)
DEFINE_SCHED_CLASS(idle)
DEFINE_SCHED_CLASS(rt)
DEFINE_SCHED_CLASS(stop)

因此,结合前面所说的调度类分层,准确的描述如下:

SCHED_CORE
dl_sched_class
ext_sched_class
fair_sched_class
idle_sched_class
rt_sched_class
stop_sched_class

这六个调度类,严格遵循先后顺序:
stop_sched_class > dl_sched_class(DEADLINE) > rt_sched_class(FIFO/RR) > ext_sched_class > fair_sched_class(CFS EEVDF) > idle_sched_class

stop_sched_class(停机调度类)|最高优先级

  • • 无用户可配置策略,内核私有
  • • 用途:CPU 热插拔、进程迁移、stop_machine 内核临界操作
  • • 特性:可抢占所有其他任务,无任何任务能抢占它

dl_sched_class(Deadline 限期调度类)|硬实时

  • • 对应策略:SCHED_DEADLINE
  • • 算法:EDF 最早截止时间优先 + CBS 带宽隔离
  • • 场景:工业控制、音视频硬实时,严格保证周期 / 截止时间

rt_sched_class(RT 实时调度类)|软实时

  • • 对应策略:SCHED_FIFO、SCHED_RR
  • • 优先级区间:0~99(数值越小优先级越高)
  • • 场景:驱动线程、低延迟音频、实时业务服务

ext_sched_class (扩展调度类) | eBPF自定义调度

  • • 对应策略:SCHED_EXT
  • • 能力说明:无固定静态优先级数值,调度逻辑完全由 eBPF 程序自定义,可自由实现业务分层优先级、大小核亲和、时延优先等调度规则
  • • 权限要求:加载 sched_ext 调度器需要 root 权限,仅普通公平类任务(SCHED_NORMAL/SCHED_BATCH)可交由该调度类管理,不干涉 DL/RT 实时任务
  • • 场景:异构大小核设备调度、AI 推理线程自适应调度、数据库低延迟调度、云租户负载隔离、业务定制化性能优化等场景

fair_sched_class(CFS 完全公平调度类)|普通用户进程

  • • 内部包含 3 种用户策略:
    • • SCHED_NORMAL(SCHED_OTHER):桌面 / 常规业务,nice -20~19
    • • SCHED_BATCH:批量后台任务,降低交互抢占
    • • SCHED_IDLE:极低权重后台,仅 CPU 空闲时运行

idle_sched_class(CPU 空闲调度类)|全局最低

  • • 无用户策略,仅每个 CPU 专属 swapper (0 号空闲线程)
  • • 仅当所有队列无就绪任务才运行,触发 CPU 节能休眠

总结

  • • 从调度器核心到实现的六个调度类,搭建起了内核调度器最核心的骨架;而我们所用的最多的,就是CFS调度类,也是最应该关注的点;
  • • sched_ext在内核6.12开始引入内核,主要是互联网大厂的推动,因为原生内核调度器绝对是核心中的核心,无法动态修改,这不能满足物联网大厂业务多变的特性,因此,互联网大厂积极推动,最终在6.12进入内核;
  • • 想说的是,sched_ext目前看起来应用前景很广,特别是结合当前的AI,可以说在各个领域都会有光明的未来,这一点,可以参考:scx

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  1. CONNECT:[ UseTime:0.000565s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000707s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000529s ]
  6. SELECT * FROM `set` [ RunTime:0.000664s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000583s ]
  8. SELECT * FROM `article` WHERE `id` = 505570 LIMIT 1 [ RunTime:0.002233s ]
  9. UPDATE `article` SET `lasttime` = 1787307593 WHERE `id` = 505570 [ RunTime:0.031938s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.005834s ]
  11. SELECT * FROM `article` WHERE `id` < 505570 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000521s ]
  12. SELECT * FROM `article` WHERE `id` > 505570 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000558s ]
  13. SELECT * FROM `article` WHERE `id` < 505570 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014055s ]
  14. SELECT * FROM `article` WHERE `id` < 505570 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001060s ]
  15. SELECT * FROM `article` WHERE `id` < 505570 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000799s ]
0.143549s