perf trace: Add --bitmask-list command-line option

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Introduce a new '--bitmask-list' command-line option for 'perf trace'.
When this option is specified, the formatting of cpumasks is delegated
to bitmap_scnprintf(), enabling cpumasks to be displayed as a condensed,
human-readable list (e.g., "0,2-5,7") instead of the default hexadecimal
representation. An example is provided below:

❯ sudo ./perf trace --show-cpu --bitmask-list --event ipi:ipi_send_cpumask --max-event 5
     0.000 [000] Xorg/1434 ipi:ipi_send_cpumask(cpumask: 2-3,6, callsite: 0xffffffff9994f8e4, callback: 0xffffffff9994fdd0)
   694.527 [002] chrome/2894 ipi:ipi_send_cpumask(cpumask: 1,3-5, callsite: 0xffffffff9994f8e4, callback: 0xffffffff9994fdd0)
  2666.608 [003] Chrome_ChildIO/2948 ipi:ipi_send_cpumask(cpumask: 4,7, callsite: 0xffffffff9994f8e4, callback: 0xffffffff9994fdd0)
  2673.638 [000] Chrome_IOThrea/2920 ipi:ipi_send_cpumask(cpumask: 2-5, callsite: 0xffffffff9994f8e4, callback: 0xffffffff9994fdd0)
  2714.228 [005] chrome/3375 ipi:ipi_send_cpumask(cpumask: 0-4,6-7, callsite: 0xffffffff9994f8e4, callback: 0xffffffff9994fdd0)

Signed-off-by: Aaron Tomlin <atomlin@atomlin.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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This commit is contained in:

Aaron Tomlin 2026-07-22 11:50:49 -04:00 • committed by Namhyung Kim

parent 89493fe58c

commit ab74d1fbe0

2 changed files with 9 additions and 0 deletions

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4

tools/perf/Documentation/perf-trace.txt

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5

tools/perf/builtin-trace.c

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