Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN

From: Yafang Shao
Date: Thu Feb 09 2023 - 10:38:52 EST

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In reply to: Kajetan Puchalski: "Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN"
Next in thread: Kajetan Puchalski: "Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN"
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On Thu, Feb 9, 2023 at 10:28 PM Kajetan Puchalski
<kajetan.puchalski@xxxxxxx> wrote:
>
> On Thu, Feb 09, 2023 at 02:20:36PM +0800, Yafang Shao wrote:
>
> [...]
>
> Hi Yafang,
>
> > Many thanks for the detailed analysis. Seems it can work.
> >
> > Hi John,
> >
> > Could you pls. try the attached fix ? I have verified it in my test env.
>
> I tested the patch on my environment where I found the issue with newer
> kernels + older Perfetto. The patch does improve things so that's nice.

Thanks for the test. I don't have Perfetto in hand, so I haven't
verify Perfetto.

> It goes from "not working at all" to "mostly working but missing data"
> compared to what happens if I just revert 3087c61ed2c48548b74dd343a5209b87082c682d.
>

Do you mean there are no errors at all if revert
3087c61ed2c48548b74dd343a5209b87082c682d ?

> I'm just an end user so can't really speak to the underlying causes but
> for those more familiar with how Perfetto works this is what I'm getting:
>

The sched_switch tracepoint format file has the same output with
reverting the commit,

$ cat /sys/kernel/debug/tracing/events/sched/sched_switch/format
name: sched_switch
ID: 286
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;
field:char prev_comm[16]; offset:8; size:16; signed:0;
field:pid_t prev_pid; offset:24; size:4; signed:1;
field:int prev_prio; offset:28; size:4; signed:1;
field:long prev_state; offset:32; size:8; signed:1;
field:char next_comm[16]; offset:40; size:16; signed:0;
field:pid_t next_pid; offset:56; size:4; signed:1;
field:int next_prio; offset:60; size:4; signed:1;

print fmt: "prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==>
next_comm=%s next_pid=%d next_prio=%d", REC->prev_comm, REC->prev_pid,
REC->prev_prio, (REC->prev_state & ((((0x00000000 | 0x00000001 |
0x00000002 | 0x00000004 | 0x00000008 | 0x00000010 | 0x00000020 |
0x00000040) + 1) << 1) - 1)) ? __print_flags(REC->prev_state &
((((0x00000000 | 0x00000001 | 0x00000002 | 0x00000004 | 0x00000008 |
0x00000010 | 0x00000020 | 0x00000040) + 1) << 1) - 1), "|", {
0x00000001, "S" }, { 0x00000002, "D" }, { 0x00000004, "T" }, {
0x00000008, "t" }, { 0x00000010, "X" }, { 0x00000020, "Z" }, {
0x00000040, "P" }, { 0x00000080, "I" }) : "R", REC->prev_state &
(((0x00000000 | 0x00000001 | 0x00000002 | 0x00000004 | 0x00000008 |
0x00000010 | 0x00000020 | 0x00000040) + 1) << 1) ? "+" : "",
REC->next_comm, REC->next_pid, REC->next_prio

So may be these errors were caused by other issues ?

> Error stats for this trace:
> name idx source value
> ---------------------------------------- ---------------------------------------- ---------------------------------------- ----------------------------------------
> mismatched_sched_switch_tids [NULL] analysis 11101
> systrace_parse_failure [NULL] analysis 19040
>
> The trace explorer window ends up containing the ftrace-specific tracks
> but missing the tracks related to Android-specific callbacks and such.
>
> Debug stats below in case they're relevant:
>
> Name Value Type
> android_br_parse_errors 0 error (trace)
> android_log_format_invalid 0 error (trace)
> android_log_num_failed 0 error (trace)
> android_log_num_skipped 0 info (trace)
> android_log_num_total 0 info (trace)
> clock_sync_cache_miss 181 info (analysis)
> clock_sync_failure 0 error (analysis)
> compact_sched_has_parse_errors 0 error (trace)
> compact_sched_switch_skipped 0 info (analysis)
> compact_sched_waking_skipped 0 info (analysis)
> counter_events_out_of_order 0 error (analysis)
> deobfuscate_location_parse_error 0 error (trace)
> empty_chrome_metadata 0 error (trace)
> energy_breakdown_missing_values 0 error (analysis)
> energy_descriptor_invalid 0 error (analysis)
> energy_uid_breakdown_missing_values 0 error (analysis)
> flow_duplicate_id 0 error (trace)
> flow_end_without_start 0 info (trace)
> flow_invalid_id 0 error (trace)
> flow_no_enclosing_slice 0 error (trace)
> flow_step_without_start 0 info (trace)
> flow_without_direction 0 error (trace)
> frame_timeline_event_parser_errors 0 info (analysis)
> ftrace_bundle_tokenizer_errors 0 error (analysis)
> ftrace_cpu_bytes_read_begin[0] 0 info (trace)
> ftrace_cpu_bytes_read_begin[1] 264 info (trace)
> ftrace_cpu_bytes_read_begin[2] 0 info (trace)
> ftrace_cpu_bytes_read_begin[3] 224 info (trace)
> ftrace_cpu_bytes_read_begin[4] 0 info (trace)
> ftrace_cpu_bytes_read_begin[5] 0 info (trace)
> ftrace_cpu_bytes_read_begin[6] 0 info (trace)
> ftrace_cpu_bytes_read_begin[7] 0 info (trace)
> ftrace_cpu_bytes_read_delta[0] 6919836 info (trace)
> ftrace_cpu_bytes_read_delta[1] 7197556 info (trace)
> ftrace_cpu_bytes_read_delta[2] 6381828 info (trace)
> ftrace_cpu_bytes_read_delta[3] 5988336 info (trace)
> ftrace_cpu_bytes_read_delta[4] 5933528 info (trace)
> ftrace_cpu_bytes_read_delta[5] 4858400 info (trace)
> ftrace_cpu_bytes_read_delta[6] 6175260 info (trace)
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> ftrace_cpu_bytes_read_end[0] 6919836 info (trace)
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> ftrace_cpu_bytes_read_end[5] 4858400 info (trace)
> ftrace_cpu_bytes_read_end[6] 6175260 info (trace)
> ftrace_cpu_bytes_read_end[7] 4633460 info (trace)
> ftrace_cpu_commit_overrun_begin[0] 0 info (trace)
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> ftrace_cpu_dropped_events_begin[0] 0 info (trace)
> ftrace_cpu_dropped_events_begin[1] 0 info (trace)
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> ftrace_cpu_dropped_events_begin[3] 0 info (trace)
> ftrace_cpu_dropped_events_begin[4] 0 info (trace)
> ftrace_cpu_dropped_events_begin[5] 0 info (trace)
> ftrace_cpu_dropped_events_begin[6] 0 info (trace)
> ftrace_cpu_dropped_events_begin[7] 0 info (trace)
> ftrace_cpu_dropped_events_delta[0] 0 error (trace)
> ftrace_cpu_dropped_events_delta[1] 0 error (trace)
> ftrace_cpu_dropped_events_delta[2] 0 error (trace)
> ftrace_cpu_dropped_events_delta[3] 0 error (trace)
> ftrace_cpu_dropped_events_delta[4] 0 error (trace)
> ftrace_cpu_dropped_events_delta[5] 0 error (trace)
> ftrace_cpu_dropped_events_delta[6] 0 error (trace)
> ftrace_cpu_dropped_events_delta[7] 0 error (trace)
> ftrace_cpu_dropped_events_end[0] 0 info (trace)
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> ftrace_cpu_dropped_events_end[2] 0 info (trace)
> ftrace_cpu_dropped_events_end[3] 0 info (trace)
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> ftrace_cpu_entries_begin[0] 0 info (trace)
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> ftrace_cpu_entries_begin[6] 0 info (trace)
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> ftrace_cpu_now_ts_begin[3] 93305207000 info (trace)
> ftrace_cpu_now_ts_begin[4] 93305262000 info (trace)
> ftrace_cpu_now_ts_begin[5] 93305312000 info (trace)
> ftrace_cpu_now_ts_begin[6] 93305362000 info (trace)
> ftrace_cpu_now_ts_begin[7] 93305411000 info (trace)
> ftrace_cpu_now_ts_end[0] 282906571000 info (trace)
> ftrace_cpu_now_ts_end[1] 282906676000 info (trace)
> ftrace_cpu_now_ts_end[2] 282906738000 info (trace)
> ftrace_cpu_now_ts_end[3] 282906803000 info (trace)
> ftrace_cpu_now_ts_end[4] 282906863000 info (trace)
> ftrace_cpu_now_ts_end[5] 282906925000 info (trace)
> ftrace_cpu_now_ts_end[6] 282906987000 info (trace)
> ftrace_cpu_now_ts_end[7] 282907048000 info (trace)
> ftrace_cpu_oldest_event_ts_begin[0] 0 info (trace)
> ftrace_cpu_oldest_event_ts_begin[1] 93304642000 info (trace)
> ftrace_cpu_oldest_event_ts_begin[2] 0 info (trace)
> ftrace_cpu_oldest_event_ts_begin[3] 93304876000 info (trace)
> ftrace_cpu_oldest_event_ts_begin[4] 0 info (trace)
> ftrace_cpu_oldest_event_ts_begin[5] 0 info (trace)
> ftrace_cpu_oldest_event_ts_begin[6] 0 info (trace)
> ftrace_cpu_oldest_event_ts_begin[7] 0 info (trace)
> ftrace_cpu_oldest_event_ts_end[0] 282905715000 info (trace)
> ftrace_cpu_oldest_event_ts_end[1] 282903723000 info (trace)
> ftrace_cpu_oldest_event_ts_end[2] 282903881000 info (trace)
> ftrace_cpu_oldest_event_ts_end[3] 282816175000 info (trace)
> ftrace_cpu_oldest_event_ts_end[4] 282896619000 info (trace)
> ftrace_cpu_oldest_event_ts_end[5] 282884168000 info (trace)
> ftrace_cpu_oldest_event_ts_end[6] 282783221000 info (trace)
> ftrace_cpu_oldest_event_ts_end[7] 282880081000 info (trace)
> ftrace_cpu_overrun_begin[0] 0 info (trace)
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> ftrace_cpu_overrun_begin[6] 0 info (trace)
> ftrace_cpu_overrun_begin[7] 0 info (trace)
> ftrace_cpu_overrun_delta[0]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[1]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[2]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[3]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[4]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[5]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[6]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_delta[7]help_outline 0 data_loss (trace)
> ftrace_cpu_overrun_end[0] 0 info (trace)
> ftrace_cpu_overrun_end[1] 0 info (trace)
> ftrace_cpu_overrun_end[2] 0 info (trace)
> ftrace_cpu_overrun_end[3] 0 info (trace)
> ftrace_cpu_overrun_end[4] 0 info (trace)
> ftrace_cpu_overrun_end[5] 0 info (trace)
> ftrace_cpu_overrun_end[6] 0 info (trace)
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> ftrace_cpu_read_events_begin[0] 0 info (trace)
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> ftrace_cpu_read_events_begin[3] 0 info (trace)
> ftrace_cpu_read_events_begin[4] 0 info (trace)
> ftrace_cpu_read_events_begin[5] 0 info (trace)
> ftrace_cpu_read_events_begin[6] 0 info (trace)
> ftrace_cpu_read_events_begin[7] 0 info (trace)
> ftrace_cpu_read_events_delta[0] 454848 info (trace)
> ftrace_cpu_read_events_delta[1] 453484 info (trace)
> ftrace_cpu_read_events_delta[2] 386290 info (trace)
> ftrace_cpu_read_events_delta[3] 356432 info (trace)
> ftrace_cpu_read_events_delta[4] 393337 info (trace)
> ftrace_cpu_read_events_delta[5] 325244 info (trace)
> ftrace_cpu_read_events_delta[6] 392637 info (trace)
> ftrace_cpu_read_events_delta[7] 350623 info (trace)
> ftrace_cpu_read_events_end[0] 454848 info (trace)
> ftrace_cpu_read_events_end[1] 453484 info (trace)
> ftrace_cpu_read_events_end[2] 386290 info (trace)
> ftrace_cpu_read_events_end[3] 356432 info (trace)
> ftrace_cpu_read_events_end[4] 393337 info (trace)
> ftrace_cpu_read_events_end[5] 325244 info (trace)
> ftrace_cpu_read_events_end[6] 392637 info (trace)
> ftrace_cpu_read_events_end[7] 350623 info (trace)
> ftrace_packet_before_tracing_starthelp_outline 0 info (analysis)
> ftrace_setup_errorshelp_outline 0 error (trace)
> fuchsia_invalid_event 0 error (analysis)
> fuchsia_non_numeric_counters 0 error (analysis)
> fuchsia_timestamp_overflow 0 error (analysis)
> game_intervention_has_parse_errorshelp_outline 0 error (trace)
> game_intervention_has_read_errorshelp_outline 0 error (trace)
> gpu_counters_invalid_spec 0 error (analysis)
> gpu_counters_missing_spec 0 error (analysis)
> gpu_render_stage_parser_errors 0 error (analysis)
> graphics_frame_event_parser_errors 0 info (analysis)
> guess_trace_type_duration_ns 7654 info (analysis)
> heap_graph_non_finalized_graph 0 error (trace)
> heapprofd_missing_packet 0 error (trace)
> heapprofd_non_finalized_profile 0 error (trace)
> interned_data_tokenizer_errors 0 info (analysis)
> invalid_clock_snapshots 0 error (analysis)
> invalid_cpu_times 0 error (analysis)
> json_display_time_unithelp_outline 0 info (trace)
> json_parser_failure 0 error (trace)
> json_tokenizer_failure 0 error (trace)
> meminfo_unknown_keys 0 error (analysis)
> memory_snapshot_parser_failure 0 error (analysis)
> metatrace_overruns 0 error (trace)
> mismatched_sched_switch_tids 11101 error (analysis)
> misplaced_end_event 0 data_loss (analysis)
> mm_unknown_type 0 error (analysis)
> ninja_parse_errors 0 error (trace)
> packages_list_has_parse_errors 0 error (trace)
> packages_list_has_read_errors 0 error (trace)
> parse_trace_duration_ns 1780589548 info (analysis)
> perf_samples_skipped 0 info (trace)
> perf_samples_skipped_dataloss 0 data_loss (trace)
> power_rail_unknown_index 0 error (trace)
> proc_stat_unknown_counters 0 error (analysis)
> process_tracker_errors 0 error (analysis)
> rss_stat_negative_size 0 info (analysis)
> rss_stat_unknown_keys 0 error (analysis)
> rss_stat_unknown_thread_for_mm_id 0 info (analysis)
> sched_switch_out_of_order 0 error (analysis)
> sched_waking_out_of_order 0 error (analysis)
> slice_out_of_order 0 error (analysis)
> sorter_push_event_out_of_orderhelp_outline 0 error (trace)
> stackprofile_invalid_callstack_id 0 error (trace)
> stackprofile_invalid_frame_id 0 error (trace)
> stackprofile_invalid_mapping_id 0 error (trace)
> stackprofile_invalid_string_id 0 error (trace)
> stackprofile_parser_error 0 error (trace)
> symbolization_tmp_build_id_not_foundhelp_outline 0 error (analysis)
> systrace_parse_failure 19040 error (analysis)
> task_state_invalid 0 error (analysis)
> thread_time_in_state_out_of_order 0 error (analysis)
> thread_time_in_state_unknown_cpu_freq 0 error (analysis)
> tokenizer_skipped_packets 0 info (analysis)
> traced_buf_abi_violations[0] 0 data_loss (trace)
> traced_buf_abi_violations[1] 0 data_loss (trace)
> traced_buf_buffer_size[0] 534773760 info (trace)
> traced_buf_buffer_size[1] 2097152 info (trace)
> traced_buf_bytes_overwritten[0] 0 info (trace)
> traced_buf_bytes_overwritten[1] 0 info (trace)
> traced_buf_bytes_read[0] 78929920 info (trace)
> traced_buf_bytes_read[1] 425984 info (trace)
> traced_buf_bytes_written[0] 78962688 info (trace)
> traced_buf_bytes_written[1] 425984 info (trace)
> traced_buf_chunks_committed_out_of_order[0] 0 info (trace)
> traced_buf_chunks_committed_out_of_order[1] 0 info (trace)
> traced_buf_chunks_discarded[0] 0 info (trace)
> traced_buf_chunks_discarded[1] 0 info (trace)
> traced_buf_chunks_overwritten[0] 0 info (trace)
> traced_buf_chunks_overwritten[1] 0 info (trace)
> traced_buf_chunks_read[0] 2428 info (trace)
> traced_buf_chunks_read[1] 13 info (trace)
> traced_buf_chunks_rewritten[0] 6 info (trace)
> traced_buf_chunks_rewritten[1] 0 info (trace)
> traced_buf_chunks_written[0] 2429 info (trace)
> traced_buf_chunks_written[1] 13 info (trace)
> traced_buf_padding_bytes_cleared[0] 0 info (trace)
> traced_buf_padding_bytes_cleared[1] 0 info (trace)
> traced_buf_padding_bytes_written[0] 0 info (trace)
> traced_buf_padding_bytes_written[1] 0 info (trace)
> traced_buf_patches_failed[0] 0 data_loss (trace)
> traced_buf_patches_failed[1] 0 data_loss (trace)
> traced_buf_patches_succeeded[0] 5633 info (trace)
> traced_buf_patches_succeeded[1] 8 info (trace)
> traced_buf_readaheads_failed[0] 115 info (trace)
> traced_buf_readaheads_failed[1] 18 info (trace)
> traced_buf_readaheads_succeeded[0] 2257 info (trace)
> traced_buf_readaheads_succeeded[1] 6 info (trace)
> traced_buf_trace_writer_packet_loss[0] 0 data_loss (trace)
> traced_buf_trace_writer_packet_loss[1] 0 data_loss (trace)
> traced_buf_write_wrap_count[0] 0 info (trace)
> traced_buf_write_wrap_count[1] 0 info (trace)
> traced_chunks_discarded 0 info (trace)
> traced_data_sources_registered 16 info (trace)
> traced_data_sources_seen 6 info (trace)
> traced_final_flush_failed 0 data_loss (trace)
> traced_final_flush_succeeded 0 info (trace)
> traced_flushes_failed 0 data_loss (trace)
> traced_flushes_requested 0 info (trace)
> traced_flushes_succeeded 0 info (trace)
> traced_patches_discarded 0 info (trace)
> traced_producers_connected 3 info (trace)
> traced_producers_seen 3 info (trace)
> traced_total_buffers 2 info (trace)
> traced_tracing_sessions 1 info (trace)
> track_event_dropped_packets_outside_of_range_of_interesthelp_outline 0 info (analysis)
> track_event_parser_errors 0 info (analysis)
> track_event_thread_invalid_endhelp_outline 0 error (trace)
> track_event_tokenizer_errors 0 info (analysis)
> truncated_sys_write_durationhelp_outline 0 data_loss (analysis)
> unknown_extension_fieldshelp_outline 0 error (trace)
> vmstat_unknown_keys 0 error (analysis)
> vulkan_allocations_invalid_string_id 0 error (trace)
>
> > --
> > Regards
> > Yafang
>
>

--
Regards
Yafang

Next message: Benjamin Tissoires: "Re: (subset) [PATCH v2 1/3] HID: logitech-hidpp: Add more debug statements"
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