90e92ace2d
Prevent newly created short-lived tasks from starving the other tasks sitting in the user-space scheduler. This can be done setting an initial vruntime of (min_vruntime + 1) to newly scheduled tasks, instead of min_vruntime: this ensures a progressing global vruntime durig each scheduler run, providing a priority boost to newer tasks (that is still beneficial for potential short-lived tasks) while also preventing excessive starvation of the other tasks sitting in the user-space scheduler, waiting to be dispatched. Without this change it is really easy to create a stall condition simply by forking a bunch of short-lived tasks in a busy loop, with this change applied the scheduler can handle properly the consistent flow of newly created short-lived tasks, without introducing any stall. Signed-off-by: Andrea Righi <andrea.righi@canonical.com> |
||
|---|---|---|
| .. | ||
| c | ||
| include | ||
| rust | ||
| meson.build | ||
| README.md | ||
| sync-to-kernel.sh | ||
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