[PATCH v3 6/8] perf test trace_btf_enum: Add regression test for the BTF augmentation of enums in 'perf trace'

Howard Chu
2024-06-24T18:12:26Z

Trace landlock_add_rule syscall to see if the output is desirable.

Trace the non-syscall tracepoint 'timer:hrtimer_init' and
'timer:hrtimer_start', see if the 'mode' argument is augmented,
the 'mode' enum argument has the prefix of 'HRTIMER_MODE_'
in its name.

Committer testing:

root@x1:~# perf test enum
124: perf trace enum augmentation tests : Ok
root@x1:~# perf test -v enum
124: perf trace enum augmentation tests : Ok
root@x1:~# perf trace -e landlock_add_rule perf test -v enum
0.000 ( 0.010 ms): perf/749827 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_PATH_BENEATH, rule_attr: 0x7ffd324171d4, flags: 45) = -1 EINVAL (Invalid argument)
0.012 ( 0.002 ms): perf/749827 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_NET_PORT, rule_attr: 0x7ffd324171e0, flags: 45) = -1 EINVAL (Invalid argument)
457.821 ( 0.007 ms): perf/749830 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_PATH_BENEATH, rule_attr: 0x7ffd4acd31e4, flags: 45) = -1 EINVAL (Invalid argument)
457.832 ( 0.003 ms): perf/749830 landlock_add_rule(ruleset_fd: 11, rule_type: LANDLOCK_RULE_NET_PORT, rule_attr: 0x7ffd4acd31f0, flags: 45) = -1 EINVAL (Invalid argument)
124: perf trace enum augmentation tests : Ok
root@x1:~#

Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Howard Chu <howardchu95@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/20240619082042.4173621-6-howardchu95@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/shell/trace_btf_enum.sh | 61 ++++++++++++++++++++++++
1 file changed, 61 insertions(+)
create mode 100755 tools/perf/tests/shell/trace_btf_enum.sh

diff --git a/tools/perf/tests/shell/trace_btf_enum.sh b/tools/perf/tests/shell/trace_btf_enum.sh
new file mode 100755
index 000000000000..7d407b52bea5
--- /dev/null
+++ b/tools/perf/tests/shell/trace_btf_enum.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+# perf trace enum augmentation tests
+# SPDX-License-Identifier: GPL-2.0
+
+err=0
+set -e
+
+syscall="landlock_add_rule"
+non_syscall="timer:hrtimer_init,timer:hrtimer_start"
+
+TESTPROG="perf test -w landlock"
+
+. "$(dirname $0)"/lib/probe.sh
+skip_if_no_perf_trace || exit 2
+
+check_vmlinux() {
+ echo "Checking if vmlinux exists"
+ if ! ls /sys/kernel/btf/vmlinux 1>/dev/null 2>&1
+ then
+ echo "trace+enum test [Skipped missing vmlinux BTF support]"
+ err=2
+ fi
+}
+
+trace_landlock() {
+ echo "Tracing syscall ${syscall}"
+
+ # test flight just to see if landlock_add_rule and libbpf are available
+ $TESTPROG
+
+ if perf trace -e $syscall $TESTPROG 2>&1 | \
+ grep -q -E ".*landlock_add_rule\(ruleset_fd: 11, rule_type: (LANDLOCK_RULE_PATH_BENEATH|LANDLOCK_RULE_NET_PORT), rule_attr: 0x[a-f0-9]+, flags: 45\) = -1.*"
+ then
+ err=0
+ else
+ err=1
+ fi
+}
+
+trace_non_syscall() {
+ echo "Tracing non-syscall tracepoint ${non-syscall}"
+ if perf trace -e $non_syscall --max-events=1 2>&1 | \
+ grep -q -E '.*timer:hrtimer_.*\(.*mode: HRTIMER_MODE_.*\)$'
+ then
+ err=0
+ else
+ err=1
+ fi
+}
+
+check_vmlinux
+
+if [ $err = 0 ]; then
+ trace_landlock
+fi
+
+if [ $err = 0 ]; then
+ trace_non_syscall
+fi
+
+exit $err
--
2.45.2