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perf stat: Add --hide-zero-events option to suppress zero-count events

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When monitoring a large number of events (e.g., with wildcards such as
--event 'syscalls:sys_enter_*'), many matched events will return a count
of zero. This clutters the output, making it difficult to spot the
active events.

Add a new option --hide-zero-events to suppress printing events that
have a count of zero.

To prevent formatting and diagnostic issues, the zero-skipping logic
implements the following rules:

    1. In metric-only mode (i.e., --metric-only), columns must remain
       aligned in the output grid. We evaluate config->metric_only first
       to avoid skipping zero-valued columns, preventing values from
       shifting left and aligning under incorrect headers

    2. For explicitly requested events, we ensure they are not silently
       hidden if they are unsupported. We only hide a zero-count event
       if counter->supported is true, ensuring that unsupported explicit
       events still report "<not supported>"

Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Aaron Tomlin 2026-07-18 21:38:00 -04:00 • committed by Namhyung Kim
commit 64724095a3
5 changed files with 55 additions and 0 deletions
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