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Andrea Righi 295873ac41 scx_rustland: always dispatch per-CPU kthreads from enqueue 
We allow tasks to bypass the user-space scheduler and be dispatched
directly using a shortcut in the enqueue path, if their running CPU is
immediately available or if the task is per-CPU kthread.

However, the shortcut is disabled if the user-space scheduler has some
pending activities to do (to avoid disrupting too much its decision).

In this case the shortcut is disabled also for per-CPU kthreads and that
may cause priority-inversion problems in the system, triggering some
stall of some per-CPU kthreads (such as rcuog/N) and short system
lockups, if the system is overloaded.

Prevent this by always enabing the dispatch shortcut for per-CPU
kthreads.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
2024-01-06 11:06:53 +01:00
..
c scx_userland: Introduce ops.update_idle() callback 2024-01-02 16:29:19 -06:00
include scheds: c: improve build portability 2024-01-02 17:39:46 +01:00
rust scx_rustland: always dispatch per-CPU kthreads from enqueue 2024-01-06 11:06:53 +01:00
meson.build Restructure scheds folder names 2023-12-17 13:14:31 -08:00
README.md Restructure scheds folder names 2023-12-17 13:14:31 -08:00
sync-to-kernel.sh Restructure scheds folder names 2023-12-17 13:14:31 -08:00

README.md

SCHED_EXT SCHEDULERS

Introduction

This directory contains the repo's schedulers.

Some of these schedulers are simply examples of different types of schedulers that can be built using sched_ext. They can be loaded and used to schedule on your system, but their primary purpose is to illustrate how various features of sched_ext can be used.

Other schedulers are actually performant, production-ready schedulers. That is, for the correct workload and with the correct tuning, they may be deployed in a production environment with acceptable or possibly even improved performance. Some of the examples could be improved to become production schedulers.

Please see the following README files for details on each of the various types of schedulers:

  • rust describes all of the schedulers with rust user space components. All of these schedulers are production ready.
  • c describes all of the schedulers with C user space components. All of these schedulers are production ready.

Note on syncing

Note that there is a sync-to-kernel.sh script in this directory. This is used to sync any changes to the specific schedulers with the Linux kernel tree. If you've made any changes to a scheduler in please use the script to synchronize with the sched_ext Linux kernel tree:

$ ./sync-to-kernel.sh /path/to/kernel/tree