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mlfq_cpu_state

scx_mlfq::bpf_intf

Struct mlfq_cpu_state 

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#[repr(C)]
pub struct mlfq_cpu_state {
    pub running_queue: s32,
    pub running_pid: u32_,
    pub steal_scan_off: u32_,
    pub cpu_ema: u64_,
    pub cpu_ema_at: u64_,
    pub running_deadline: u64_,
    pub run_start_at: u64_,
    pub running_gpu_submit: u32_,
    pub pad2: u32_,
}
Expand description

struct mlfq_cpu_state - Per-CPU occupancy and scheduling state.

Theorem: each CPU’s running queue, deadline and EMA are the observable state the dispatch and selection helpers observe. Invariant: one entry per CPU, 64 bytes, one cache line; array key is cpu id.

Derivation: running_queue/pid/deadline track the current occupant for same-queue preemption (mlfq_sameq_preempt_owed). cpu_ema is the busy-ns EMA (MLFQ_BUDGET_MAX_NS ceiling, MLFQ_EMA_HALF_LIFE_NS decay) used for cpuperf level (mlfq_cpuperf_from_ema). steal_scan_off rotates the Tier-B steal scan (Observer: dispatch observes this state, Strategy: scan order is a pluggable helper without vtable).

Why clamp: cpu_ema clamped to [0, BUDGET_MAX] bounds the cpuperf level to [0, SCX_CPUPERF_ONE] and bounds virtual-time math; deadline 0 marks unknown and never preempts.

64 bytes, one cache line.

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§running_queue: s32§running_pid: u32_§steal_scan_off: u32_§cpu_ema: u64_§cpu_ema_at: u64_§running_deadline: u64_§run_start_at: u64_§running_gpu_submit: u32_§pad2: u32_

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impl Clone for mlfq_cpu_state

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fn clone(&self) -> mlfq_cpu_state

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Copy for mlfq_cpu_state

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impl Debug for mlfq_cpu_state

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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