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
