Andrea Righi d25675ff44 scx_rustland_core: switch to FIFO when system is underutilized ... Provide a knob in scx_rustland_core to automatically turn the scheduler into a simple FIFO when the system is underutilized. This choice is based on the assumption that, in the case of system underutilization (less tasks running than the amount of available CPUs), the best scheduling policy is FIFO. With this option enabled the scheduler starts in FIFO mode. If most of the CPUs are busy (nr_running >= num_cpus - 1), the scheduler immediately exits from FIFO mode and starts to apply the logic implemented by the user-space component. Then the scheduler can switch back to FIFO if there are no tasks waiting to be scheduled (evaluated using a moving average). This option can be enabled/disabled by the user-space scheduler using the fifo_sched parameter in BpfScheduler: if set, the BPF component will periodically check for system utilization and switch back and forth to FIFO mode based on that. This allows to improve performance of workloads that are using a small amount of the available CPUs in the system, while still maintaining the same good level of performance for interactive tasks when the system is over commissioned. In certain video games, such as Baldur's Gate 3 or Counter-Strike 2, running in "normal" system conditions, we can experience a boost in fps of approximately 4-8% with this change applied. Signed-off-by: Andrea Righi <andrea.righi@canonical.com>		2024-05-21 17:39:11 +02:00
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scx_rustland_core	scx_rustland_core: switch to FIFO when system is underutilized	2024-05-21 17:39:11 +02:00
scx_utils	Add missing skel.attach() calls	2024-05-17 14:33:04 -10:00
meson.build	rust: introduce scx_rustland_core crate	2024-02-28 17:49:44 +01:00