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Date: Thu, 9 Feb 2023 14:27:17 +0000
From: Kajetan Puchalski <kajetan.puchalski@....com>
To: Yafang Shao <laoar.shao@...il.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
John Stultz <jstultz@...gle.com>,
Alexei Starovoitov <alexei.starovoitov@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Network Development <netdev@...r.kernel.org>,
bpf <bpf@...r.kernel.org>,
"linux-perf-use." <linux-perf-users@...r.kernel.org>,
Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
kernel test robot <oliver.sang@...el.com>,
kbuild test robot <lkp@...el.com>,
Andrii Nakryiko <andrii@...nel.org>,
David Hildenbrand <david@...hat.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Matthew Wilcox <willy@...radead.org>,
Al Viro <viro@...iv.linux.org.uk>,
Kees Cook <keescook@...omium.org>,
Petr Mladek <pmladek@...e.com>,
Lukasz Luba <lukasz.luba@....com>,
Qais Yousef <qyousef@...gle.com>,
Daniele Di Proietto <ddiproietto@...gle.com>
Subject: Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded
16 with TASK_COMM_LEN
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.
It goes from "not working at all" to "mostly working but missing data"
compared to what happens if I just 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:
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)
ftrace_cpu_bytes_read_delta[7] 4633460 info (trace)
ftrace_cpu_bytes_read_end[0] 6919836 info (trace)
ftrace_cpu_bytes_read_end[1] 7197820 info (trace)
ftrace_cpu_bytes_read_end[2] 6381828 info (trace)
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ftrace_cpu_bytes_read_end[4] 5933528 info (trace)
ftrace_cpu_bytes_read_end[5] 4858400 info (trace)
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ftrace_cpu_commit_overrun_end[5] 0 info (trace)
ftrace_cpu_commit_overrun_end[6] 0 info (trace)
ftrace_cpu_commit_overrun_end[7] 0 info (trace)
ftrace_cpu_dropped_events_begin[0] 0 info (trace)
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ftrace_cpu_entries_delta[4] 0 info (trace)
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ftrace_cpu_oldest_event_ts_end[0] 282905715000 info (trace)
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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)
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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)
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ftrace_cpu_overrun_delta[3]help_outline 0 data_loss (trace)
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ftrace_cpu_overrun_delta[5]help_outline 0 data_loss (trace)
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traced_buf_write_wrap_count[1] 0 info (trace)
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traced_data_sources_seen 6 info (trace)
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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
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