cpuidle, bpf: Introduce BPF-based extensible cpuidle policy via struct_ops #5858
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September 2, 2025 08:36
The BPF cpuidle ext governor registers at postcore_initcall() but remains disabled by default due to its low priority "rating" (1). Activation requires adjust higer "rating" than other governors within BPF. Core Components: 1.**struct cpuidle_gov_ext_ops** – BPF-overridable operations: - ops.enable()/ops.disable(): enable or disable callback - ops.select(): cpu Idle-state selection logic - ops.set_stop_tick(): Scheduler tick management after state selection - ops.reflect(): feedback info about previous idle state. - ops.init()/ops.deinit(): Initialization or cleanup. 2.**Critical kfuncs for kernel state access**: - bpf_cpuidle_ext_gov_update_rating(): Activate ext governor by raising rating must be called from "ops.init()" - bpf_cpuidle_ext_gov_latency_req(): get idle-state latency constraints - bpf_tick_nohz_get_sleep_length(): get CPU sleep duration in tickless mode Signed-off-by: Lin Yikai <[email protected]>
Add test to verify cpuidle governor ext's load, attach, and kfuncs. This patch also provides a simple demonstration of `cpuidle_gov_ext_ops` usage: - In `ops.init()`, we set the "rating" value to 60 - significantly exceeding other governors' ratings - to activate `cpuidle_gov_ext`. - For specific scenarios (e.g., screen-off music playback on mobile devices), we can enable "expect_deeper" to transition to deeper idle states. This implementation serves as a foundation, not a final solution. We can explore further exploration of cpuidle strategies optimized for various usage scenarios. Signed-off-by: Lin Yikai <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=996853 expired. Closing PR. |
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Pull request for series with
subject: cpuidle, bpf: Introduce BPF-based extensible cpuidle policy via struct_ops
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=996853