Messages in this thread | | | From | Namhyung Kim <> | Date | Fri, 28 Apr 2017 12:07:30 +0900 | Subject | Re: perf report warnings on tracepoint events hidden by ui |
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Hi,
On Fri, Apr 28, 2017 at 9:31 AM, David Carrillo-Cisneros <davidcc@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
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