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Pass enqueue flags to user-space: flags will be passed via QueuedTask.flags and can be forwarded back to BPF via DispatchedTask.flags. These flags can be also passed to BpfScheduler.select_cpu() to apply a more refined CPU selection policy. Moreover, avoid to prioritize the user-space scheduler too much and dispatch it only if there are no other tasks that needs to be dispatched in ops.dispatch(). This improves CPU utilization and enhances the fairness, robustness, and resilience of schedulers based on scx_rustland_core, particularly under stress test conditions. Signed-off-by: Andrea Righi <andrea.righi@linux.dev> |
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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.