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Introduce the new `--lowlatency` option, which enables switching between the default pure vruntime-based scheduling (more optimized for server workloads) and a deadline-based scheduling (better suited for low-latency workloads). When the low-latency mode is activated, a task's deadline is calculated as its vruntime, adjusted by a bonus proportional to the task's average number of voluntary context switches (the more voluntary context switches, the shorter the deadline). This feature enhances the prioritization of interactive tasks even more, proportionally to their average voluntary context switches, also within the two main global queues (priority / shared) and it helps to maintain interactive workloads always responsive, even in presence of heavy non-interactive background work. Low-latency mode allows to prevent audio cracking even in presence of a large amount of short-lived tasks with pseudo-interactive behavior (i.e, hackbench) and it enables achieving approximately a +33% average frames-per-second (FPS) in the typical "gaming while building the kernel" benchmark. However, it can also amplify the de-prioritization of CPU-intensive tasks, making this option more suitable for specific low-latency scenarios. Therefore the low-latency mode is disabled by default and it can only be enabled via the `--lowlatency` option. Tested-by: Piotr Gorski (piotrgorski@cachyos.org) Signed-off-by: Andrea Righi <andrea.righi@linux.dev> |
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| scx_bpfland | ||
| scx_lavd | ||
| scx_layered | ||
| scx_mitosis | ||
| scx_rlfifo | ||
| scx_rustland | ||
| scx_rusty | ||
| meson.build | ||
| README.md | ||
RUST SCHEDULERS
Introduction
This directory contains schedulers with user space rust components.
The README in each scheduler directory provides some background and describes the types of workloads or scenarios they're designed to accommodate. For more details on any of these schedulers, please see the header comment in their main.rs or *.bpf.c files.