From: Kajetan Puchalski <kajetan.puchalski@arm.com>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
John Stultz <jstultz@google.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Network Development <netdev@vger.kernel.org>,
bpf <bpf@vger.kernel.org>,
"linux-perf-use." <linux-perf-users@vger.kernel.org>,
Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
kernel test robot <oliver.sang@intel.com>,
kbuild test robot <lkp@intel.com>,
Andrii Nakryiko <andrii@kernel.org>,
David Hildenbrand <david@redhat.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Michal Miroslaw <mirq-linux@rere.qmqm.pl>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Matthew Wilcox <willy@infradead.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Kees Cook <keescook@chromium.org>, Petr Mladek <pmladek@suse.com>,
Lukasz Luba <lukasz.luba@arm.com>,
Qais Yousef <qyousef@google.com>,
Daniele Di Proietto <ddiproietto@google.com>
Subject: Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN
Date: Thu, 9 Feb 2023 14:27:17 +0000 [thread overview]
Message-ID: <Y+UCxSktKM0CzMlA@e126311.manchester.arm.com> (raw)
In-Reply-To: <CALOAHbBsmajStJ8TrnqEL_pv=UOt-vv0CH30EqThVq=JYXfi8A@mail.gmail.com>
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)
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flow_end_without_start 0 info (trace)
flow_invalid_id 0 error (trace)
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traced_tracing_sessions 1 info (trace)
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track_event_thread_invalid_endhelp_outline 0 error (trace)
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truncated_sys_write_durationhelp_outline 0 data_loss (analysis)
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vmstat_unknown_keys 0 error (analysis)
vulkan_allocations_invalid_string_id 0 error (trace)
> --
> Regards
> Yafang
next prev parent reply other threads:[~2023-02-09 14:28 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-20 11:27 [PATCH v2 0/7] task comm cleanups Yafang Shao
2021-11-20 11:27 ` [PATCH v2 1/7] fs/exec: replace strlcpy with strscpy_pad in __set_task_comm Yafang Shao
2021-11-20 11:27 ` [PATCH v2 2/7] fs/exec: replace strncpy with strscpy_pad in __get_task_comm Yafang Shao
2021-11-20 11:27 ` [PATCH v2 3/7] drivers/infiniband: replace open-coded string copy with get_task_comm Yafang Shao
2021-11-20 11:27 ` [PATCH v2 4/7] fs/binfmt_elf: " Yafang Shao
2021-11-29 16:01 ` Steven Rostedt
2021-11-30 3:01 ` Yafang Shao
2021-11-30 14:22 ` Steven Rostedt
2021-11-30 15:53 ` Yafang Shao
2021-11-20 11:27 ` [PATCH v2 5/7] samples/bpf/test_overhead_kprobe_kern: replace bpf_probe_read_kernel with bpf_probe_read_kernel_str to get task comm Yafang Shao
2021-11-20 11:27 ` [PATCH v2 6/7] tools/bpf/bpftool/skeleton: " Yafang Shao
2021-11-20 11:27 ` [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN Yafang Shao
2021-11-29 10:13 ` Sven Schnelle
2021-11-29 13:41 ` Yafang Shao
2021-11-29 14:21 ` Sven Schnelle
2021-11-29 14:32 ` David Hildenbrand
2021-11-29 14:38 ` Sven Schnelle
2021-11-29 15:33 ` Yafang Shao
2021-11-29 16:07 ` Steven Rostedt
2021-11-29 16:08 ` Steven Rostedt
2021-11-29 15:28 ` Yafang Shao
2021-11-29 17:30 ` Steven Rostedt
2021-11-29 17:56 ` Sven Schnelle
2021-11-30 3:03 ` Yafang Shao
2021-11-30 14:23 ` Steven Rostedt
2021-11-30 15:46 ` Yafang Shao
2023-02-08 21:55 ` John Stultz
2023-02-09 0:10 ` Alexei Starovoitov
2023-02-09 0:54 ` John Stultz
2023-02-09 2:06 ` Mathieu Desnoyers
2023-02-09 6:20 ` Yafang Shao
2023-02-09 14:27 ` Kajetan Puchalski [this message]
2023-02-09 15:37 ` Yafang Shao
2023-02-10 18:09 ` Kajetan Puchalski
2023-02-11 16:51 ` Qais Yousef
2023-02-12 3:19 ` Yafang Shao
2023-02-09 2:28 ` Steven Rostedt
2023-02-09 2:33 ` Steven Rostedt
2023-02-11 19:00 ` Steven Rostedt
2023-02-12 3:38 ` Yafang Shao
2023-02-12 3:44 ` Steven Rostedt
2023-02-13 17:43 ` Namhyung Kim
2023-02-13 17:46 ` Mathieu Desnoyers
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