linux-kernel - [PATCH v2 0/5] perf test trace: Reduce test failures and make error messages verbose

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Message-ID: <20250518190957.58932-1-howardchu95@gmail.com>
Date: Sun, 18 May 2025 12:09:52 -0700
From: Howard Chu <howardchu95@...il.com>
To: acme@...nel.org
Cc: mingo@...hat.com,
	namhyung@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	peterz@...radead.org,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>
Subject: [PATCH v2 0/5] perf test trace: Reduce test failures and make error messages verbose

Currently, BTF tests fail constantly, this series fixes two major reasons
why they fail, and makes the error messages acquired when using '-vv'
more verbose, so when they fail, one can easily diagnose the problem.

Before:
    $ sudo /tmp/perf test enum -vv
    107: perf trace enum augmentation tests:
    107: perf trace enum augmentation tests                              : Running
    --- start ---
    test child forked, pid 783533
    Checking if vmlinux exists
    Tracing syscall landlock_add_rule
    Tracing non-syscall tracepoint syscall
    ---- end(-1) ----
    107: perf trace enum augmentation tests                              : FAILED!

After:
    $ sudo /tmp/perf test enum -vv
    107: perf trace enum augmentation tests:
    107: perf trace enum augmentation tests                              : Running
    --- start ---
    test child forked, pid 851658
    Checking if vmlinux exists
    Tracing syscall landlock_add_rule
    Tracing non-syscall tracepoint timer:hrtimer_setup,timer:hrtimer_start
    [tracepoint failure] Failed to trace tracepoint timer:hrtimer_setup,timer:hrtimer_start, output:
    event syntax error: 'timer:hrtimer_setup,timer:hrtimer_start'
			 \___ unknown tracepoint

    Error:  File /sys/kernel/tracing//events/timer/hrtimer_setup not found.
    Hint:   Perhaps this kernel misses some CONFIG_ setting to enable this feature?.

    Run 'perf list' for a list of valid events

     Usage: perf trace [<options>] [<command>]
	or: perf trace [<options>] -- <command> [<options>]
	or: perf trace record [<options>] [<command>]
	or: perf trace record [<options>] -- <command> [<options>]

	-e, --event <event>   event/syscall selector. use 'perf list' to list available events---- end(-1) ----
    107: perf trace enum augmentation tests                              : FAILED!

Changes in v2:
- Add an extra newline after error messages
- Rename the title of patch 3 to 'Stop tracing hrtimer_setup...'
- Take the debug diff for explanation out of patch 5 to make it apply
  normally
- Add base-commit in this cover letter

Howard Chu (5):
  perf test trace: Use shell's -f flag to check if vmlinux exists
  perf test trace: Remove set -e and print trace test's error messages
  perf test trace: Stop tracing hrtimer_setup event in trace enum test
  perf test trace: Remove set -e for BTF general tests
  perf test trace BTF: Use --sort-events in BTF general tests

 tools/perf/tests/shell/trace_btf_enum.sh    | 17 +++++++++--------
 tools/perf/tests/shell/trace_btf_general.sh | 19 +++++++++----------
 2 files changed, 18 insertions(+), 18 deletions(-)


base-commit: f3061d526714ac6cc936c48e76a6eb0512c69b1a
-- 
2.45.2