Hi,
On Fri, Apr 28, 2017 at 9:31 AM, David Carrillo-Cisneros
<davi...@google.com> wrote:
> 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.
Yep, currently perf report TUI hides warnings since there's no space
to show them.
>
> $ 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?
But I don't see any warning when I run it with --stdio. Could you
show me the format file of sys_enter_mmap?
Thanks,
Namhyung
