Enum Column 

#[non_exhaustive]
pub enum Column {
    Group,
    Threads,
    Metric,
    Baseline,
    Candidate,
    Delta,
    Pct,
    Arrow,
    Value,
    Tags,
    Uptime,
    SortBy,
}

One column slot in the rendered diff/show table. The renderer iterates the resolved Column vec to build both the header row and each data row, dispatching cell construction per variant. Order in the slice is the rendered order — the renderer never re-sorts.

Column variants are uniform across compare and show even though show’s Column::Baseline, Column::Candidate, Column::Delta, Column::Pct, Column::Arrow are meaningless for a single snapshot. The show entry point rejects those names at CLI parse time so an operator never reaches the renderer with a mismatched column set.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Group

The group-by axis label (rendered header is “pcomm”, “cgroup”, “comm-pattern”, or “comm” per GroupBy).

Threads

Thread-count cell (N when the count matches across snapshots, A->B arrow form otherwise).

Metric

Metric name with bracketed tag suffix.

Baseline

Baseline value (compare only).

Candidate

Candidate value (compare only).

Delta

Signed delta (compare only).

Pct

Percentage delta (compare only).

Arrow

Single-cell <baseline> -> <candidate> (compare only). Mutually exclusive with Baseline/Candidate (the arrow cell already shows both); coexists with Delta/Pct, which remain separate numeric columns.

Value

Aggregated value cell (show only).

Tags

Bracketed tag suffix (sched_class + config_gates + dead). Off by default — opt in with --columns ...,tags.

Uptime

Relative uptime: group age as a percentage of the oldest thread in the snapshot. 100% = as old as the oldest thread, 0% = just spawned. Color gradient: green ≥75%, yellow 50–75%, red <50% (>2x younger than the oldest).

SortBy

Sort-by metric summary column. Shows the –sort-by metric’s baseline→candidate (delta%) per group. Only present when –sort-by is set.

Implementations

impl Column

pub fn cli_name(self) -> &'static str

Canonical CLI name. Round-trips through parse_columns.

pub fn header(self, group_header: &'static str) -> &'static str

Header cell text. The group axis carries a per-GroupBy label (pcomm, cgroup, etc.); other columns echo Self::cli_name.

Trait Implementations

impl Clone for Column

fn clone(&self) -> Column

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Column

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

Formats the value using the given formatter.

impl PartialEq for Column

fn eq(&self, other: &Column) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Column

impl Eq for Column

impl StructuralPartialEq for Column