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Subjectperf report warnings on tracepoint events hidden by ui
When processing tracepoint events, perf report outputs warnings about
field not founds. The warnings are usually hidden by perf report UI
and appear when using the --stdio option. e.g.

$ perf record -e syscalls:sys_enter_mmap some_load

$ perf report --stdio

Warning: [syscalls:sys_enter_mmap] eval_num_arg: field addr not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field len not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field prot not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field flags not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field fd not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field off not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field addr not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field len not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field prot not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field flags not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field fd not found
Warning: [syscalls:sys_enter_mmap] eval_num_arg: field off not found

I bisected the warnings to:
commit d49dadea78624 ("perf tools: Make 'trace' or 'trace_fields'
sort key default for tracepoint events").

that introduced sorting by trace. The event's format in my example is:

$ cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_socket/format

name: sys_enter_socket
ID: 1850
format:
field:unsigned short common_type; offset:0;
size:2; signed:0;
field:unsigned char common_flags; offset:2;
size:1; signed:0;
field:unsigned char common_preempt_count; offset:3;
size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;

print fmt: "family: 0x%08lx, type: 0x%08lx, protocol: 0x%08lx",
((unsigned long)(REC->family)), ((unsigned long)(REC->type)),
((unsigned long)(REC->protocol))


An appears to be correctly parsed by event_read_print in
tools/lib/tracevent/event-parse.c . Has anyone seen this before?

Thanks,
David

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