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mlfq_tree_sample

scx_mlfq::bpf_intf

Struct mlfq_tree_sample 

Source 
#[repr(C, packed(4))]
pub struct mlfq_tree_sample {
    pub pid: u32_,
    pub queue: u32_,
    pub feats: mlfq_tree_feats,
    pub label_ns: u64_,
    pub version: u32_,
}
Expand description

struct mlfq_tree_sample - One training sample for the daemon.

Theorem: the ring-buffer record is the atomic training unit. Invariant: 84 bytes packed aligned(4), field order is the shared ABI.

Derivation: pid/queue (8 bytes) + feats 64 bytes + label 8 bytes + version 4 bytes = 84. The feats vector is the 64-byte form (sq_ema at 40, sleep_var_ratio at 48, gpu_submit at 56). label_ns is clamped to MLFQ_TREE_LABEL_MAX_NS, so the fitter’s f64 sums never sum near-u64 values.

Why clamp: version is MLFQ_TREE_SAMPLE_VERSION (4 for 1.3.11 ABI); mismatch drops the record instead of misreading fields.

Observer helper: stopping path observes task state to emit this record; daemon observes the ring buffer (Observer) without shared state.

84 bytes packed aligned(4); every field keeps its natural offset.

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§pid: u32_§queue: u32_§feats: mlfq_tree_feats§label_ns: u64_§version: u32_

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impl Clone for mlfq_tree_sample

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fn clone(&self) -> mlfq_tree_sample

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_sample

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impl Debug for mlfq_tree_sample

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

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