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scx/scheds/rust/scx_rlfifo
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Andrea Righi 5da4602ad7 scx_rustland_core: use a BPF_MAP_TYPE_USER_RINGBUF to dispatch tasks 
Replace the BPF_MAP_TYPE_QUEUE with a BPF_MAP_TYPE_USER_RINGBUF to store
the tasks dispatched from the user-space scheduler to the BPF component.

This eliminates the need of the bpf() syscalls, significantly reducing
the overhead of the user-space->kernel communication and delivering a
notable performance boost in the overall system throughput.

Based on experimental results, this change allows to reduces the scheduling
overhead by approximately 30-35% when the system is overcommitted.

This improvement has the potential to make user-space schedulers based
on scx_rustland_core viable options for real production systems.

Link: https://github.com/libbpf/libbpf-rs/pull/776
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
2024-05-08 22:16:53 +02:00
..
src scx_rustland: Apply API updates and add --exit-dump-len option to scx_rustland 2024-04-02 10:30:56 -10:00
.gitignore scx_rustland_core: generate source files in-tree 2024-02-28 17:49:44 +01:00
build.rs scx_rustland_core: introduce RustLandBuilder() 2024-02-28 17:49:44 +01:00
Cargo.toml scx_rustland_core: use a BPF_MAP_TYPE_USER_RINGBUF to dispatch tasks 2024-05-08 22:16:53 +02:00
LICENSE scx_rlfifo: simple user-space FIFO scheduler written in Rust 2024-02-28 17:49:44 +01:00
meson.build scheds-rust: build rust schedulers in sequence 2024-04-23 08:06:27 +08:00
README.md scx_rlfifo: simple user-space FIFO scheduler written in Rust 2024-02-28 17:49:44 +01:00
rustfmt.toml scx_rlfifo: simple user-space FIFO scheduler written in Rust 2024-02-28 17:49:44 +01:00

README.md

scx_rlfifo

This is a single user-defined scheduler used within sched_ext, which is a Linux kernel feature which enables implementing kernel thread schedulers in BPF and dynamically loading them. Read more about sched_ext.

Overview

scx_rlfifo is a simple FIFO scheduler runs in user-space, based on the scx_rustland_core framework.

Typical Use Case

This scheduler is provided as a simple template that can be used as a baseline to test more complex scheduling policies.

Production Ready?

Definitely not. Using this scheduler in a production environment is not recommended, unless there are specific requirements that necessitate a basic FIFO scheduling approach. Even then, it's still recommended to use the kernel's SCHED_FIFO real-time class.