CONFIG_SCHED_CLASS_EXT: Extensible Scheduling Class

General informations

The Linux kernel configuration item CONFIG_SCHED_CLASS_EXT:

• prompt: Extensible Scheduling Class
• type: bool
• depends on: CONFIG_BPF_SYSCALL && CONFIG_BPF_JIT && CONFIG_DEBUG_INFO_BTF
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 6.12, 6.13-rc+HEAD

Help text

This option enables a new scheduler class sched_ext (SCX), which allows scheduling policies to be implemented as BPF programs to achieve the following:

- Ease of experimentation and exploration: Enabling rapid iteration of new scheduling policies. - Customization: Building application-specific schedulers which implement policies that are not applicable to general-purpose schedulers. - Rapid scheduler deployments: Non-disruptive swap outs of scheduling policies in production environments.

sched_ext leverages BPF struct_ops feature to define a structure which exports function callbacks and flags to BPF programs that wish to implement scheduling policies. The struct_ops structure exported by sched_ext is struct sched_ext_ops, and is conceptually similar to struct sched_class.

For more information: Documentation/scheduler/sched-ext.rst https://github.com/sched-ext/scx

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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