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mlfq_tree_feats

scx_mlfq::bpf_intf

Struct mlfq_tree_feats 

Source 
#[repr(C)]
pub struct mlfq_tree_feats {
    pub prev_burst_ns: u64_,
    pub sleep_ns: u64_,
    pub ema: u64_,
    pub io_wait: u32_,
    pub wake_cnt: u32_,
    pub wake_lat_us: u32_,
    pub queue_wait_us: u32_,
    pub sq_ema: u64_,
    pub sleep_var_ratio: u32_,
    pub pad: u32_,
    pub gpu_submit: u32_,
    pub pad2: u32_,
}
Expand description

struct mlfq_tree_feats - Feature vector of the prediction tree.

Theorem: the vector is the per-task state the CART predictor may split on. Invariant: field order and offsets are the shared ABI with emitted samples (mlfq_tree_sample) and the Rust TreeFeats mirror; any reordering breaks bindgen and the ring-buffer parse.

Derivation: prev_burst/sleep/ema/io_wait/wake_cnt are the original 32-byte prefix. wake_lat/queue_wait/sq_ema measure the previous episode’s enqueue-to-run service, appended without reordering. The 7.1 ABI adds sleep_var_ratio, the fixed-point (FP_SHIFT=8) variation ratio of sleep intervals, to capture frame-cadence regularity; it stays carry-along until the fitter promotes it. sq_ema remains at offset 40, sleep_var_ratio at 48. The 1.3.11 ABI adds gpu_submit, the quantised (FP_SHIFT 0..4) gpu submission count, at offset 56 with pad2 for 64-byte alignment. The resulting 64-byte record keeps every u64 at an 8-byte offset and the packed sample at 84 bytes.

Why clamp: wake_lat/queue_wait are bounded via _MAX constants and label clamp, so the fitter’s f64 sums stay overflow-free; the var ratio is FP_ONE-scaled and clamped to [0, FP_ONE*2] to bound threshold midpoints; gpu_submit is clamped to [0,4] quant steps.

Strategy helper: classification selects the queue via the tree walk (Strategy) observing this feature state (Observer) without a vtable; helpers are static inline.

64 bytes, packed fields naturally aligned.

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§prev_burst_ns: u64_§sleep_ns: u64_§ema: u64_§io_wait: u32_§wake_cnt: u32_§wake_lat_us: u32_§queue_wait_us: u32_§sq_ema: u64_§sleep_var_ratio: u32_§pad: u32_§gpu_submit: u32_§pad2: u32_

Trait Implementations§

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impl Clone for mlfq_tree_feats

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fn clone(&self) -> mlfq_tree_feats

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_tree_feats

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impl Debug for mlfq_tree_feats

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

Formats the value using the given formatter. Read more

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