[PATCH v3 2/4] selftests/ftrace: Add boot-time tracing testcases
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2026-08-12 00:43:52
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, the rest, tracing · Maintainers:
Shuah Khan, Shuah Khan, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: Masami Hiramatsu (Google) <mhiramat@kernel.org> Add test cases for boot-time tracing configuration via bootconfig (see Documentation/trace/boottime-trace.rst). These test cases verify: - 01-kprobe: Dynamic kprobe events via bootconfig - 02-synth: Synthetic events via bootconfig - 03-eprobe: Event probes (eprobes) via bootconfig - 04-fprobe: Function probes (fprobes) via bootconfig - 05-tprobe: Tracepoint probes via bootconfig - 06-instance: Custom trace instances via bootconfig Assisted-by: Antigravity:gemini-3.6-flash Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> --- .../ftrace/boottime/bootconfigs/01-kprobe.bconf | 4 +++ .../ftrace/boottime/bootconfigs/02-synth.bconf | 4 +++ .../ftrace/boottime/bootconfigs/03-eprobe.bconf | 4 +++ .../ftrace/boottime/bootconfigs/04-fprobe.bconf | 4 +++ .../ftrace/boottime/bootconfigs/05-tprobe.bconf | 4 +++ .../ftrace/boottime/bootconfigs/06-instance.bconf | 5 +++ .../selftests/ftrace/boottime/tests/01-kprobe.sh | 25 +++++++++++++++++ .../selftests/ftrace/boottime/tests/02-synth.sh | 25 +++++++++++++++++ .../selftests/ftrace/boottime/tests/03-eprobe.sh | 25 +++++++++++++++++ .../selftests/ftrace/boottime/tests/04-fprobe.sh | 25 +++++++++++++++++ .../selftests/ftrace/boottime/tests/05-tprobe.sh | 25 +++++++++++++++++ .../selftests/ftrace/boottime/tests/06-instance.sh | 30 ++++++++++++++++++++ 12 files changed, 180 insertions(+) create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf create mode 100644 tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh create mode 100644 tools/testing/selftests/ftrace/boottime/tests/02-synth.sh create mode 100644 tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh create mode 100644 tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh create mode 100644 tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh create mode 100644 tools/testing/selftests/ftrace/boottime/tests/06-instance.sh
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf
new file mode 100644
index 000000000000..13d30d1e51a6
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf@@ -0,0 +1,4 @@ +ftrace.event.kprobes.vfs_read { + probes = "vfs_read $arg1" + enable +}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf
new file mode 100644
index 000000000000..b1f37713f33c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf@@ -0,0 +1,4 @@ +ftrace.event.synthetic.boot_lat { + fields = "unsigned long id", "u64 delta" + enable +}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf
new file mode 100644
index 000000000000..c1a8138e605d
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf@@ -0,0 +1,4 @@ +ftrace.event.eprobes.ep_read { + probes = "sched/sched_switch" + enable +}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf
new file mode 100644
index 000000000000..82ae2ac0629f
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf@@ -0,0 +1,4 @@ +ftrace.event.fprobes.fp_read { + probes = "vfs_read" + enable +}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf
new file mode 100644
index 000000000000..02a2803c770a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf@@ -0,0 +1,4 @@ +ftrace.event.tracepoints.tp_sched { + probes = "sched_switch" + enable +}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf
new file mode 100644
index 000000000000..3fdb6717afe2
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf@@ -0,0 +1,5 @@ +ftrace.instance.foo { + event.sched.sched_switch { + enable + } +}
diff --git a/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh
new file mode 100644
index 000000000000..6ed7caca4c5f
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh@@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check kprobe bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/events/kprobes/vfs_read" ]; then + echo "FAIL: kprobe event kprobes/vfs_read does not exist" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/events/kprobes/vfs_read/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: kprobe event kprobes/vfs_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 01-kprobe" +exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh b/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh
new file mode 100644
index 000000000000..745c328dde15
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh@@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check synthetic event bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/events/synthetic/boot_lat" ]; then + echo "FAIL: synthetic event synthetic/boot_lat does not exist" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/events/synthetic/boot_lat/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: synthetic event synthetic/boot_lat is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 02-synth" +exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh
new file mode 100644
index 000000000000..9b3b7ab23c69
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh@@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check eprobe event bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/events/eprobes/ep_read" ]; then + echo "FAIL: eprobe event eprobes/ep_read does not exist" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/events/eprobes/ep_read/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: eprobe event eprobes/ep_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 03-eprobe" +exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh
new file mode 100644
index 000000000000..27e090c28a4b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh@@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check fprobe event bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/events/fprobes/fp_read" ]; then + echo "FAIL: fprobe event fprobes/fp_read does not exist" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/events/fprobes/fp_read/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: fprobe event fprobes/fp_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 04-fprobe" +exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh
new file mode 100644
index 000000000000..810d34055f94
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh@@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check tracepoint probe event bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/events/tracepoints/tp_sched" ]; then + echo "FAIL: tracepoint probe event tracepoints/tp_sched does not exist" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/events/tracepoints/tp_sched/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: tracepoint probe event tracepoints/tp_sched is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 05-tprobe" +exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh b/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh
new file mode 100644
index 000000000000..f6e8519912e4
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh@@ -0,0 +1,30 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check instance bootconfig settings on tracefs +TRACEDIR="/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/null; then + echo "=== /proc/bootconfig ===" + cat /proc/bootconfig + echo "========================" +fi + +if [ ! -d "$TRACEDIR/instances/foo" ]; then + echo "FAIL: trace instance foo does not exist" + exit 1 +fi + +if [ ! -d "$TRACEDIR/instances/foo/events/sched/sched_switch" ]; then + echo "FAIL: event sched_switch does not exist in instance foo" + exit 1 +fi + +ENABLE=$(cat "$TRACEDIR/instances/foo/events/sched/sched_switch/enable") +if [ "$ENABLE" != "1" ]; then + echo "FAIL: event sched_switch is not enabled in instance foo ($ENABLE)" + exit 1 +fi + +echo "PASS: 06-instance" +exit 0