e8978ebe23
We can sometimes hit scenarios in the scx_userland scheduler where there is work to be done in user space, but we incorrectly fail to run the user space scheduler. In order to avoid this, we can use global variables that are set from both BPF and user space. The BPF-side variable reflects when one or more tasks have been enqueued, and the user space-side variable reflects when user space has received tasks but has not yet dispatched them. In the ops.update_idle() callback, we can check these variables and send a resched IPI to a core to ensure that the user-space scheduler is always scheduled when there's work to be done. Signed-off-by: David Vernet <void@manifault.com> |
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| rust | ||
| meson.build | ||
| README.md | ||
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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