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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>
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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@ -247,6 +247,10 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
pretty-printing serves as a fallback to hand-crafted pretty printers, as the latter can
better pretty-print integer flags and struct pointers.
--bitmask-list::
Show bitmasks as a human-readable, condensed list (e.g. "0,2-5,7")
instead of the default hexadecimal representation.
--bpf-summary::
Collect system call statistics in BPF. This is only for live mode and
works well with -s/--summary option where no argument information is

5
tools/perf/builtin-trace.c
View File

@ -226,6 +226,7 @@ struct trace {
bool force;
bool vfs_getname;
bool force_btf;
bool bitmask_list;
bool summary_bpf;
int trace_pgfaults;
char *perfconfig_events;
@ -3280,6 +3281,9 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct perf_sample *
if (syscall_arg.len == 0) {
printed += scnprintf(bf + printed, size - printed, "0");
} else if (trace->bitmask_list) {
printed += bitmap_scnprintf(mask, syscall_arg.len * 8,
bf + printed, size - printed);
} else {
int i;
bool skip_zero = true;
@ -5593,6 +5597,7 @@ int cmd_trace(int argc, const char **argv)
"start"),
OPT_BOOLEAN(0, "force-btf", &trace.force_btf, "Prefer btf_dump general pretty printer"
"to customized ones"),
OPT_BOOLEAN(0, "bitmask-list", &trace.bitmask_list, "Show bitmask as a human-readable list"),
OPT_BOOLEAN(0, "bpf-summary", &trace.summary_bpf, "Summary syscall stats in BPF"),
OPT_INTEGER(0, "max-summary", &trace.max_summary,
"Max number of entries in the summary."),