Struct TLBShootdownConfig 

pub struct TLBShootdownConfig {
    pub page_count_range: (usize, usize),
    pub region_pages: usize,
    pub measure_variance: bool,
}

Configuration for TLB shootdown entropy collection.

Example

let config = TLBShootdownConfig {
    page_count_range: (16, 64),   // fewer pages = fewer IPIs
    region_pages: 128,            // smaller region
    measure_variance: true,       // delta-of-deltas (recommended)
};

Fields

page_count_range: (usize, usize)

Range of pages to invalidate per measurement (min, max).

Varying the page count changes the number of Inter-Processor Interrupts (IPIs) sent per mprotect() call. More pages = more IPIs = longer and more variable latency.

Both values are clamped to [1, region_pages].

Range: min 1, max = region_pages. Default: (8, 128)

region_pages: usize

Total memory region size in pages.

Larger regions use different physical pages each measurement, preventing TLB prefetch patterns. The region is allocated via mmap and touched on every page to establish TLB entries before measurement begins.

Range: 8+. Default: 256 (1 MB with 4KB pages)

measure_variance: bool

Use delta-of-deltas (variance) extraction (true) or standard absolute timing extraction (false).

Variance mode computes second-order deltas between consecutive shootdowns, removing systematic bias and amplifying the nondeterministic component. Produces higher min-entropy at the cost of ~2x raw samples.

Default: true

Trait Implementations

impl Clone for TLBShootdownConfig

fn clone(&self) -> TLBShootdownConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TLBShootdownConfig

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

Formats the value using the given formatter.

impl Default for TLBShootdownConfig

fn default() -> Self

Returns the “default value” for a type.