* [PATCH v2 1/4] selftests/ftrace: Add generic boot tracing test framework
2026-08-11 15:34 [PATCH v2 0/4] selftests/ftrace: Add a boottime tracing test framework Masami Hiramatsu (Google)
@ 2026-08-11 15:34 ` Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 2/4] selftests/ftrace: Add boot-time tracing testcases Masami Hiramatsu (Google)
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-11 15:34 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel,
linux-kselftest
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Add a generic test framework under tools/testing/selftests/ftrace/boottime/
to verify kernel boot tracing configurations (bootconfig, kernel
command-line tracing options, and persistent ring buffers) during early
boot.
The test runner (run_boottime_test.sh) sources ktap_helpers.sh to generate
output in TAP version 13 format. It builds a minimal initramfs with busybox,
dynamically resolves test specifications (.bconf for bootconfig, .cmdline
for kernel boot parameters, .qemuopts for QEMU options, and # REBOOT: 1
for multi-boot crash/reboot tests with doubled timeout), boots QEMU, and
runs corresponding tracefs checker scripts.
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
Changes in v2:
- Add top-level boottime-ktap wrapper script and include it in
TEST_PROGS in Makefile.
- Define BUSYBOX_APPLETS as a global array variable including sleep
and sed.
- Require timeout tool in run_boottime_test.sh and README, and always
invoke QEMU under timeout command to prevent infinite execution loops.
- Add fallback sleep loop safeguard (sleep 100 || break) in guest
init script.
- Support multi-line .qemuopts files using read -r -d '' -a qemu_args.
---
tools/testing/selftests/ftrace/Makefile | 4
tools/testing/selftests/ftrace/boottime-ktap | 6
tools/testing/selftests/ftrace/boottime/Makefile | 10 +
tools/testing/selftests/ftrace/boottime/README | 72 ++++
.../selftests/ftrace/boottime/run_boottime_test.sh | 384 ++++++++++++++++++++
tools/testing/selftests/ftrace/config | 6
6 files changed, 480 insertions(+), 2 deletions(-)
create mode 100755 tools/testing/selftests/ftrace/boottime-ktap
create mode 100644 tools/testing/selftests/ftrace/boottime/Makefile
create mode 100644 tools/testing/selftests/ftrace/boottime/README
create mode 100755 tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile
index 7c12263f8260..3d41f9545683 100644
--- a/tools/testing/selftests/ftrace/Makefile
+++ b/tools/testing/selftests/ftrace/Makefile
@@ -2,8 +2,8 @@
all:
TEST_PROGS_EXTENDED := ftracetest
-TEST_PROGS := ftracetest-ktap
-TEST_FILES := test.d settings
+TEST_PROGS := ftracetest-ktap boottime-ktap
+TEST_FILES := test.d settings boottime
EXTRA_CLEAN := $(OUTPUT)/logs/*
TEST_GEN_FILES := poll
diff --git a/tools/testing/selftests/ftrace/boottime-ktap b/tools/testing/selftests/ftrace/boottime-ktap
new file mode 100755
index 000000000000..1fed68c8a944
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime-ktap
@@ -0,0 +1,6 @@
+#!/bin/sh -e
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# boottime-ktap: Wrapper to integrate boottime tracing test framework with kselftest runner
+
+exec ./boottime/run_boottime_test.sh "$@"
diff --git a/tools/testing/selftests/ftrace/boottime/Makefile b/tools/testing/selftests/ftrace/boottime/Makefile
new file mode 100644
index 000000000000..fd0975350f10
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+all:
+
+run_tests:
+ @./run_boottime_test.sh
+
+clean:
+
+.PHONY: all run_tests clean
diff --git a/tools/testing/selftests/ftrace/boottime/README b/tools/testing/selftests/ftrace/boottime/README
new file mode 100644
index 000000000000..d047cca192dc
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/README
@@ -0,0 +1,72 @@
+Boot Tracing Test Suite
+=======================
+
+This directory contains an automated test framework to verify kernel boot
+tracing configurations (bootconfig, kernel command-line tracing options, and
+persistent ring buffers) during early boot.
+
+Overview
+--------
+The test runner (`run_boottime_test.sh`) constructs a lightweight initramfs with
+busybox and a tracefs checker script from `tests/`, attaches optional bootconfigs
+from `bootconfigs/` using the `bootconfig` tool, applies optional command-line
+parameters from `cmdlines/`, boots the target kernel image under QEMU, and reports
+results according to TAP version 13 format.
+
+Test Specification Format
+-------------------------
+For each test script `tests/<name>.sh`, the harness dynamically detects:
+- `bootconfigs/<name>.bconf` or `<name>.bconf`: Bootconfig configuration file.
+- `cmdlines/<name>.cmdline` or `# CMDLINE: <opts>` header in script: Kernel boot parameters.
+- `qemuopts/<name>.qemuopts` or `# QEMUOPTS: <opts>` header in script: Additional QEMU CLI arguments.
+- `# REBOOT: 1` header in script: Multi-boot reboot/crash test mode (omits `-no-reboot` and doubles timeout).
+
+Required Tools
+--------------
+- Host Architecture: x86 (x86_64/i686/i386/x86; tests skip on non-x86 hosts)
+- `qemu-system-x86_64` (or custom QEMU executable)
+- `busybox` (host binary at `/usr/bin/busybox` or custom path)
+- `bootconfig` (compiled from `tools/bootconfig/bootconfig` or in PATH)
+- `cpio` (standard archiver)
+- `timeout` (standard coreutils execution timer)
+
+Required Kernel Configurations
+------------------------------
+The kernel binary under test must be compiled with:
+- `CONFIG_BOOT_CONFIG=y`
+- `CONFIG_BOOTTIME_TRACING=y`
+- `CONFIG_MAGIC_SYSRQ=y` (for guest reboot and poweroff)
+
+Additional feature-specific config options enable respective testcases:
+- `CONFIG_KPROBE_EVENTS=y` (for kprobe tests)
+- `CONFIG_SYNTH_EVENTS=y` (for synthetic event tests)
+- `CONFIG_EPROBE_EVENTS=y` (for eprobe tests)
+- `CONFIG_FPROBE_EVENTS=y` (for fprobe and tracepoint probe tests)
+- `CONFIG_FUNCTION_TRACER=y` (for tracer options)
+- `CONFIG_RESERVE_MEM=y` (for persistent ring buffer tests)
+
+Usage
+-----
+To run all test cases with a compiled kernel image:
+
+ $ ./run_boottime_test.sh -k /path/to/bzImage
+
+To run a specific test case (e.g. `01-kprobe`):
+
+ $ ./run_boottime_test.sh -k /path/to/bzImage -t 01-kprobe
+
+Customizing Tool Paths:
+
+ $ ./run_boottime_test.sh -b /path/to/bootconfig \
+ -k /path/to/bzImage \
+ -q /path/to/qemu-system-x86_64 \
+ -B /path/to/busybox
+
+Environment Variables
+---------------------
+Tool locations and kernel paths can also be set via environment variables:
+- `BOOTCONFIG`: Path to the `bootconfig` tool
+- `KERNEL`: Path to the `bzImage` kernel binary
+- `QEMU`: Path to the QEMU binary
+- `BUSYBOX`: Path to the `busybox` binary
+- `LOGDIR`: Directory path to preserve QEMU execution log files
diff --git a/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh b/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
new file mode 100755
index 000000000000..89f326648103
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
@@ -0,0 +1,384 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+#
+# Generic Boot Tracing Test Harness
+# Builds a lightweight initramfs, applies bootconfigs and kernel cmdline parameters,
+# boots QEMU, and verifies tracefs configuration using test scripts.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+if [ -d "$SCRIPT_DIR/boottime" ]; then
+ SCRIPT_DIR="$SCRIPT_DIR/boottime"
+fi
+KERNEL_SRC="$(cd "$SCRIPT_DIR/../../../../.." && pwd)"
+
+# Source KTAP helpers
+if [ -f "$SCRIPT_DIR/../../kselftest/ktap_helpers.sh" ]; then
+ KSELFTEST_DIR="$(cd "$SCRIPT_DIR/../../kselftest" && pwd)"
+elif [ -f "$SCRIPT_DIR/../kselftest/ktap_helpers.sh" ]; then
+ KSELFTEST_DIR="$(cd "$SCRIPT_DIR/../kselftest" && pwd)"
+else
+ echo "Error: ktap_helpers.sh not found relative to $SCRIPT_DIR" >&2
+ exit 1
+fi
+. "$KSELFTEST_DIR/ktap_helpers.sh"
+
+BOOTCONFIG="${BOOTCONFIG:-"$KERNEL_SRC/tools/bootconfig/bootconfig"}"
+KERNEL="${KERNEL:-"$KERNEL_SRC/arch/x86/boot/bzImage"}"
+QEMU="${QEMU:-"qemu-system-x86_64"}"
+BUSYBOX="${BUSYBOX:-"$(which busybox 2>/dev/null || echo "/usr/bin/busybox")"}"
+TIMEOUT="${TIMEOUT:-60s}"
+LOGDIR="${LOGDIR:-""}"
+TARGET_TEST="all"
+
+BUSYBOX_APPLETS=(
+ sh
+ cat
+ mount
+ umount
+ echo
+ sync
+ reboot
+ poweroff
+ cpio
+ grep
+ sleep
+ sed
+)
+
+usage() {
+ echo "Usage: $0 [options]"
+ echo "Options:"
+ echo " -b, --bootconfig PATH Path to bootconfig tool (default: $BOOTCONFIG)"
+ echo " -k, --kernel PATH Path to kernel image (default: $KERNEL)"
+ echo " -q, --qemu PATH Path to QEMU executable (default: $QEMU)"
+ echo " -B, --busybox PATH Path to busybox binary (default: $BUSYBOX)"
+ echo " -T, --timeout DURATION QEMU execution timeout (default: $TIMEOUT)"
+ echo " -l, --logdir DIR Directory to save QEMU log files"
+ echo " -t, --test NAME Run specific test (e.g. 01-kprobe) or 'all'"
+ echo " -h, --help Show this help message"
+ exit 1
+}
+
+while [ $# -gt 0 ]; do
+ case "$1" in
+ -b|--bootconfig)
+ BOOTCONFIG="$2"
+ shift 2
+ ;;
+ -k|--kernel)
+ KERNEL="$2"
+ shift 2
+ ;;
+ -q|--qemu)
+ QEMU="$2"
+ shift 2
+ ;;
+ -B|--busybox)
+ BUSYBOX="$2"
+ shift 2
+ ;;
+ -T|--timeout)
+ TIMEOUT="$2"
+ shift 2
+ ;;
+ -l|--logdir)
+ LOGDIR="$2"
+ shift 2
+ ;;
+ -t|--test)
+ TARGET_TEST="$2"
+ shift 2
+ ;;
+ -h|--help)
+ usage
+ ;;
+ *)
+ echo "Unknown option: $1"
+ usage
+ ;;
+ esac
+done
+
+# Check host architecture
+HOST_ARCH="$(uname -m)"
+case "$HOST_ARCH" in
+ x86_64|i686|i386|x86)
+ ;;
+ *)
+ if [ "$KERNEL" = "$KERNEL_SRC/arch/x86/boot/bzImage" ]; then
+ ktap_print_header
+ ktap_skip_all \
+ "Default boot tracing test is x86 only ($HOST_ARCH)"
+ exit 0
+ fi
+ ;;
+esac
+
+# Ensure bootconfig tool is built if Makefile exists
+if [ ! -x "$BOOTCONFIG" ]; then
+ if [ -f "$KERNEL_SRC/tools/bootconfig/Makefile" ]; then
+ make -C "$KERNEL_SRC/tools/bootconfig" > /dev/null 2>&1 || true
+ fi
+ if [ ! -x "$BOOTCONFIG" ]; then
+ BOOTCONFIG="$(which bootconfig 2>/dev/null || true)"
+ fi
+fi
+
+if [ ! -x "$BOOTCONFIG" ]; then
+ ktap_print_header
+ ktap_skip_all "bootconfig tool not found at $BOOTCONFIG"
+ exit 0
+fi
+
+if [ ! -f "$KERNEL" ]; then
+ ktap_print_header
+ ktap_skip_all "Kernel image not found at $KERNEL"
+ exit 0
+fi
+
+if ! command -v "$QEMU" >/dev/null 2>&1; then
+ ktap_print_header
+ ktap_skip_all "QEMU binary not found: $QEMU"
+ exit 0
+fi
+
+if [ ! -x "$BUSYBOX" ]; then
+ ktap_print_header
+ ktap_skip_all "busybox binary not found at $BUSYBOX"
+ exit 0
+fi
+
+# Verify busybox architecture compatibility
+if command -v file >/dev/null 2>&1; then
+ BUSYBOX_INFO="$(file -b "$BUSYBOX" 2>/dev/null || true)"
+ case "$KERNEL" in
+ *x86*)
+ case "$BUSYBOX_INFO" in
+ *x86-64*|*x86_64*|*80386*|*i386*)
+ ;;
+ *)
+ ktap_print_header
+ ktap_skip_all \
+ "busybox binary architecture is incompatible with x86 kernel ($BUSYBOX_INFO)"
+ exit 0
+ ;;
+ esac
+ ;;
+ esac
+fi
+
+if ! command -v cpio >/dev/null 2>&1; then
+ ktap_print_header
+ ktap_skip_all "cpio tool not found"
+ exit 0
+fi
+
+if ! command -v timeout >/dev/null 2>&1; then
+ ktap_print_header
+ ktap_skip_all "timeout tool not found"
+ exit 0
+fi
+
+double_timeout() {
+ local val="$1"
+ if [[ "$val" =~ ^([0-9]+)([a-z]*)$ ]]; then
+ local num="${BASH_REMATCH[1]}"
+ local unit="${BASH_REMATCH[2]}"
+ echo "$((num * 2))$unit"
+ else
+ echo "120s"
+ fi
+}
+
+run_single_test() {
+ local test_script="$1"
+ local name
+ local dir
+ name="$(basename "$test_script" .sh)"
+ dir="$(dirname "$test_script")"
+
+ local bconf_file=""
+ if [ -f "$SCRIPT_DIR/bootconfigs/$name.bconf" ]; then
+ bconf_file="$SCRIPT_DIR/bootconfigs/$name.bconf"
+ elif [ -f "$dir/$name.bconf" ]; then
+ bconf_file="$dir/$name.bconf"
+ fi
+
+ local test_cmdline=""
+ if [ -f "$SCRIPT_DIR/cmdlines/$name.cmdline" ]; then
+ test_cmdline="$(cat "$SCRIPT_DIR/cmdlines/$name.cmdline")"
+ elif [ -f "$dir/$name.cmdline" ]; then
+ test_cmdline="$(cat "$dir/$name.cmdline")"
+ fi
+
+ local inline_cmdline
+ inline_cmdline="$(grep -E '^# *CMDLINE:' "$test_script" | sed 's/^# *CMDLINE://' | xargs || true)"
+ if [ -n "$inline_cmdline" ]; then
+ test_cmdline="$test_cmdline $inline_cmdline"
+ fi
+
+ local test_qemuopts=""
+ if [ -f "$SCRIPT_DIR/qemuopts/$name.qemuopts" ]; then
+ test_qemuopts="$(cat "$SCRIPT_DIR/qemuopts/$name.qemuopts")"
+ elif [ -f "$dir/$name.qemuopts" ]; then
+ test_qemuopts="$(cat "$dir/$name.qemuopts")"
+ fi
+
+ local inline_qemuopts
+ inline_qemuopts="$(grep -E '^# *QEMUOPTS:' "$test_script" | sed 's/^# *QEMUOPTS://' | xargs || true)"
+ if [ -n "$inline_qemuopts" ]; then
+ test_qemuopts="$test_qemuopts $inline_qemuopts"
+ fi
+
+ local test_timeout="$TIMEOUT"
+ local inline_timeout
+ inline_timeout="$(grep -E '^# *TIMEOUT:' "$test_script" | sed 's/^# *TIMEOUT://' | xargs || true)"
+ if [ -n "$inline_timeout" ]; then
+ test_timeout="$inline_timeout"
+ fi
+
+ local is_reboot=0
+ if grep -q -E '^# *REBOOT: *1' "$test_script" || [ -f "$dir/$name.reboot" ]; then
+ is_reboot=1
+ fi
+
+ local effective_timeout="$test_timeout"
+ if [ "$is_reboot" -eq 1 ]; then
+ effective_timeout="$(double_timeout "$test_timeout")"
+ fi
+
+ local workdir
+ workdir="$(mktemp -d)"
+ if [ -z "$workdir" ] || [ ! -d "$workdir" ]; then
+ ktap_test_fail "$name (failed to create temporary directory)"
+ return 0
+ fi
+ trap 'rm -rf "$workdir"' EXIT
+
+ local rootfs="$workdir/rootfs"
+ mkdir -p "$rootfs"/{bin,sbin,etc,proc,sys,dev,tmp}
+
+ cp "$BUSYBOX" "$rootfs/bin/busybox"
+ chmod +x "$rootfs/bin/busybox"
+ (cd "$rootfs/bin" && for applet in "${BUSYBOX_APPLETS[@]}"; do ln -s busybox "$applet"; done)
+
+ if command -v ldd >/dev/null 2>&1; then
+ for lib in $(ldd "$BUSYBOX" 2>/dev/null | grep -o '/[^ ]*' || true); do
+ if [ -f "$lib" ]; then
+ mkdir -p "$rootfs$(dirname "$lib")"
+ cp -L "$lib" "$rootfs$lib" 2>/dev/null || true
+ fi
+ done
+ fi
+
+ cat << 'EOF' > "$rootfs/init"
+#!/bin/sh
+mount -t proc proc /proc 2>/dev/null
+mount -t sysfs sys /sys 2>/dev/null
+mount -t tracefs nodev /sys/kernel/tracing 2>/dev/null
+
+/bin/check_test.sh
+RET=$?
+
+if [ $RET -eq 0 ]; then
+ echo "TEST RESULT: PASS"
+else
+ echo "TEST RESULT: FAIL"
+fi
+sync
+echo o > /proc/sysrq-trigger 2>/dev/null || true
+poweroff -f 2>/dev/null || reboot -f 2>/dev/null || true
+while true; do sleep 100 2>/dev/null || break; done
+EOF
+ chmod +x "$rootfs/init"
+
+ cp "$test_script" "$rootfs/bin/check_test.sh"
+ chmod +x "$rootfs/bin/check_test.sh"
+
+ local initramfs="$workdir/initramfs.cpio"
+ (cd "$rootfs" && find . | cpio -o -H newc --quiet) > "$initramfs"
+
+ if [ -n "$bconf_file" ] && [ -f "$bconf_file" ]; then
+ "$BOOTCONFIG" -a "$bconf_file" "$initramfs" > /dev/null
+ fi
+
+
+ local logfile
+ local base_cmdline="bootconfig console=tty0 console=ttyS0 panic=-1"
+ if [ -n "$test_cmdline" ]; then
+ base_cmdline="$base_cmdline $test_cmdline"
+ fi
+
+ if [ -n "$LOGDIR" ]; then
+ mkdir -p "$LOGDIR"
+ logfile="$LOGDIR/$name.log"
+ base_cmdline="$base_cmdline dump_bconf"
+ else
+ logfile="$workdir/qemu.log"
+ base_cmdline="quiet $base_cmdline"
+ fi
+
+ local qemu_args=()
+ if [ -n "$test_qemuopts" ]; then
+ read -r -d '' -a qemu_args <<< "$test_qemuopts" || true
+ fi
+
+ if [ "$is_reboot" -ne 1 ]; then
+ qemu_args+=("-no-reboot")
+ fi
+
+ timeout "$effective_timeout" "$QEMU" -kernel "$KERNEL" \
+ -initrd "$initramfs" \
+ -append "$base_cmdline" \
+ -display none \
+ -serial stdio \
+ "${qemu_args[@]}" < /dev/null > "$logfile" 2>&1 || true
+
+ if grep -q "TEST RESULT: PASS" "$logfile"; then
+ ktap_test_pass "$name"
+ else
+ ktap_test_fail "$name"
+ ktap_print_msg "QEMU Console Output for $name:"
+ while IFS= read -r line; do
+ ktap_print_msg "$line"
+ done < "$logfile"
+ fi
+
+ rm -rf "$workdir"
+ trap - EXIT
+ return 0
+}
+
+TEST_SCRIPTS=()
+if [ -d "$SCRIPT_DIR/tests" ]; then
+ while IFS= read -r f; do
+ [ -n "$f" ] && TEST_SCRIPTS+=("$f")
+ done < <(find "$SCRIPT_DIR/tests" -type f -name "*.sh" | sort)
+fi
+
+TOTAL_TESTS=0
+for test_script in "${TEST_SCRIPTS[@]}"; do
+ name="$(basename "$test_script" .sh)"
+ if [ "$TARGET_TEST" != "all" ] && [ "$TARGET_TEST" != "$name" ]; then
+ continue
+ fi
+ TOTAL_TESTS=$((TOTAL_TESTS + 1))
+done
+
+ktap_print_header
+ktap_set_plan "$TOTAL_TESTS"
+
+for test_script in "${TEST_SCRIPTS[@]}"; do
+ name="$(basename "$test_script" .sh)"
+
+ if [ "$TARGET_TEST" != "all" ] && [ "$TARGET_TEST" != "$name" ]; then
+ continue
+ fi
+
+ run_single_test "$test_script"
+done
+
+ktap_finished
diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config
index 544de0db5f58..29f05f7c6e2c 100644
--- a/tools/testing/selftests/ftrace/config
+++ b/tools/testing/selftests/ftrace/config
@@ -1,3 +1,5 @@
+CONFIG_BOOT_CONFIG=y
+CONFIG_BOOTTIME_TRACING=y
CONFIG_BPF_SYSCALL=y
CONFIG_DEBUG_INFO_BTF=y
CONFIG_DEBUG_INFO_DWARF4=y
@@ -8,22 +10,26 @@ CONFIG_FTRACE=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_FUNCTION_GRAPH_RETVAL=y
CONFIG_FUNCTION_PROFILER=y
+CONFIG_FUNCTION_TRACER=y
CONFIG_HIST_TRIGGERS=y
CONFIG_IRQSOFF_TRACER=y
CONFIG_KALLSYMS_ALL=y
CONFIG_KPROBES=y
CONFIG_KPROBE_EVENTS=y
+CONFIG_MAGIC_SYSRQ=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_PREEMPTIRQ_DELAY_TEST=m
CONFIG_PREEMPT_TRACER=y
CONFIG_PROBE_EVENTS_BTF_ARGS=y
+CONFIG_RESERVE_MEM=y
CONFIG_SAMPLES=y
CONFIG_SAMPLE_FTRACE_DIRECT=m
CONFIG_SAMPLE_TRACE_EVENTS=m
CONFIG_SAMPLE_TRACE_PRINTK=m
CONFIG_SCHED_TRACER=y
CONFIG_STACK_TRACER=y
+CONFIG_SYNTH_EVENTS=y
CONFIG_TRACER_SNAPSHOT=y
CONFIG_UPROBES=y
CONFIG_UPROBE_EVENTS=y
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 2/4] selftests/ftrace: Add boot-time tracing testcases
2026-08-11 15:34 [PATCH v2 0/4] selftests/ftrace: Add a boottime tracing test framework Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 1/4] selftests/ftrace: Add generic boot " Masami Hiramatsu (Google)
@ 2026-08-11 15:34 ` Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 3/4] selftests/ftrace: Add kernel cmdline " Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 4/4] selftests/ftrace: Add persistent ring buffer testcases Masami Hiramatsu (Google)
3 siblings, 0 replies; 5+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-11 15:34 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel,
linux-kselftest
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
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 3/4] selftests/ftrace: Add kernel cmdline tracing testcases
2026-08-11 15:34 [PATCH v2 0/4] selftests/ftrace: Add a boottime tracing test framework Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 1/4] selftests/ftrace: Add generic boot " Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 2/4] selftests/ftrace: Add boot-time tracing testcases Masami Hiramatsu (Google)
@ 2026-08-11 15:34 ` Masami Hiramatsu (Google)
2026-08-11 15:34 ` [PATCH v2 4/4] selftests/ftrace: Add persistent ring buffer testcases Masami Hiramatsu (Google)
3 siblings, 0 replies; 5+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-11 15:34 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel,
linux-kselftest
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Add test cases for kernel command-line tracing options. It verifies
various parameters like trace_buf_size and trace_options by reading
the output of tracing files in sysfs.
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
Changes in v2:
- Fix buffer_size_kb parsing in cmdline-03-trace-buf-size.sh to handle
unexpanded buffer string output '1 (expanded: 2048)'.
- Use grep -qw in cmdline-04-trace-options.sh to match word options
and avoid matching disabled 'no<option>' entries.
---
.../boottime/cmdlines/cmdline-01-ftrace.cmdline | 1 +
.../cmdlines/cmdline-02-trace-event.cmdline | 1 +
.../cmdlines/cmdline-03-trace-buf-size.cmdline | 1 +
.../cmdlines/cmdline-04-trace-options.cmdline | 1 +
.../cmdlines/cmdline-05-trace-clock.cmdline | 1 +
.../cmdlines/cmdline-06-trace-instance.cmdline | 1 +
.../ftrace/boottime/tests/cmdline-01-ftrace.sh | 19 ++++++++++++++
.../boottime/tests/cmdline-02-trace-event.sh | 26 +++++++++++++++++++
.../boottime/tests/cmdline-03-trace-buf-size.sh | 28 ++++++++++++++++++++
.../boottime/tests/cmdline-04-trace-options.sh | 23 ++++++++++++++++
.../boottime/tests/cmdline-05-trace-clock.sh | 19 ++++++++++++++
.../boottime/tests/cmdline-06-trace-instance.sh | 24 +++++++++++++++++
12 files changed, 145 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-01-ftrace.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-02-trace-event.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-03-trace-buf-size.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-04-trace-options.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-05-trace-clock.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-06-trace-instance.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-01-ftrace.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-02-trace-event.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-03-trace-buf-size.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-04-trace-options.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-05-trace-clock.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/cmdline-06-trace-instance.sh
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-01-ftrace.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-01-ftrace.cmdline
new file mode 100644
index 000000000000..4f6fc54240c8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-01-ftrace.cmdline
@@ -0,0 +1 @@
+ftrace=function
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-02-trace-event.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-02-trace-event.cmdline
new file mode 100644
index 000000000000..66bcd29b14cb
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-02-trace-event.cmdline
@@ -0,0 +1 @@
+trace_event=sched:sched_switch,kmem:kmalloc
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-03-trace-buf-size.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-03-trace-buf-size.cmdline
new file mode 100644
index 000000000000..e5d1c4a8ca89
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-03-trace-buf-size.cmdline
@@ -0,0 +1 @@
+trace_buf_size=2048K
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-04-trace-options.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-04-trace-options.cmdline
new file mode 100644
index 000000000000..51d82f8e948d
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-04-trace-options.cmdline
@@ -0,0 +1 @@
+trace_options=sym-addr,verbose
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-05-trace-clock.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-05-trace-clock.cmdline
new file mode 100644
index 000000000000..f72a4ac808a3
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-05-trace-clock.cmdline
@@ -0,0 +1 @@
+trace_clock=global
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-06-trace-instance.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-06-trace-instance.cmdline
new file mode 100644
index 000000000000..9618e3e2b88b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/cmdline-06-trace-instance.cmdline
@@ -0,0 +1 @@
+trace_instance=bar,sched:sched_switch
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-01-ftrace.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-01-ftrace.sh
new file mode 100644
index 000000000000..23a0b15f2dd3
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-01-ftrace.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check ftrace= kernel command-line tracer setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -f "$TRACEDIR/current_tracer" ]; then
+ echo "FAIL: current_tracer does not exist"
+ exit 1
+fi
+
+read -r TRACER _ < "$TRACEDIR/current_tracer"
+if [ "$TRACER" != "function" ]; then
+ echo "FAIL: current_tracer is '$TRACER', expected 'function'"
+ exit 1
+fi
+
+echo "PASS: cmdline-01-ftrace"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-02-trace-event.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-02-trace-event.sh
new file mode 100644
index 000000000000..b793907c48cd
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-02-trace-event.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check trace_event= kernel command-line setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/sched/sched_switch" ]; then
+ echo "FAIL: event sched:sched_switch does not exist"
+ exit 1
+fi
+
+if [ ! -d "$TRACEDIR/events/kmem/kmalloc" ]; then
+ echo "FAIL: event kmem:kmalloc does not exist"
+ exit 1
+fi
+
+ENABLE1=$(cat "$TRACEDIR/events/sched/sched_switch/enable")
+ENABLE2=$(cat "$TRACEDIR/events/kmem/kmalloc/enable")
+
+if [ "$ENABLE1" != "1" ] || [ "$ENABLE2" != "1" ]; then
+ echo "FAIL: events not enabled (sched_switch=$ENABLE1, kmalloc=$ENABLE2)"
+ exit 1
+fi
+
+echo "PASS: cmdline-02-trace-event"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-03-trace-buf-size.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-03-trace-buf-size.sh
new file mode 100644
index 000000000000..2eab5fb487a3
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-03-trace-buf-size.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check trace_buf_size= kernel command-line setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -f "$TRACEDIR/buffer_size_kb" ]; then
+ echo "FAIL: buffer_size_kb does not exist"
+ exit 1
+fi
+
+BUF_RAW=$(cat "$TRACEDIR/buffer_size_kb")
+case "$BUF_RAW" in
+ *"expanded:"*)
+ BUFSIZE=$(echo "$BUF_RAW" | sed -n 's/.*expanded: *\([0-9]*\).*/\1/p')
+ ;;
+ *)
+ BUFSIZE=$(echo "$BUF_RAW" | awk '{print $1}')
+ ;;
+esac
+
+if [ -z "$BUFSIZE" ] || [ "$BUFSIZE" -lt 2048 ]; then
+ echo "FAIL: buffer_size_kb is '$BUF_RAW', expected >= 2048"
+ exit 1
+fi
+
+echo "PASS: cmdline-03-trace-buf-size"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-04-trace-options.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-04-trace-options.sh
new file mode 100644
index 000000000000..53a65b55f7a7
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-04-trace-options.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check trace_options= kernel command-line setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -f "$TRACEDIR/trace_options" ]; then
+ echo "FAIL: trace_options file does not exist"
+ exit 1
+fi
+
+if ! grep -qw "sym-addr" "$TRACEDIR/trace_options"; then
+ echo "FAIL: sym-addr option is not set in trace_options"
+ exit 1
+fi
+
+if ! grep -qw "verbose" "$TRACEDIR/trace_options"; then
+ echo "FAIL: verbose option is not set in trace_options"
+ exit 1
+fi
+
+echo "PASS: cmdline-04-trace-options"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-05-trace-clock.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-05-trace-clock.sh
new file mode 100644
index 000000000000..d6de9f6e2090
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-05-trace-clock.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check trace_clock= kernel command-line setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -f "$TRACEDIR/trace_clock" ]; then
+ echo "FAIL: trace_clock file does not exist"
+ exit 1
+fi
+
+if ! grep -q '\[global\]' "$TRACEDIR/trace_clock"; then
+ CLOCK=$(cat "$TRACEDIR/trace_clock")
+ echo "FAIL: trace_clock is not set to global ($CLOCK)"
+ exit 1
+fi
+
+echo "PASS: cmdline-05-trace-clock"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/cmdline-06-trace-instance.sh b/tools/testing/selftests/ftrace/boottime/tests/cmdline-06-trace-instance.sh
new file mode 100644
index 000000000000..aae7f0a86d81
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/cmdline-06-trace-instance.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check trace_instance= kernel command-line setting
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/instances/bar" ]; then
+ echo "FAIL: trace instance bar does not exist"
+ exit 1
+fi
+
+if [ ! -d "$TRACEDIR/instances/bar/events/sched/sched_switch" ]; then
+ echo "FAIL: event sched_switch does not exist in instance bar"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/instances/bar/events/sched/sched_switch/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: event sched_switch is not enabled in instance bar ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: cmdline-06-trace-instance"
+exit 0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 4/4] selftests/ftrace: Add persistent ring buffer testcases
2026-08-11 15:34 [PATCH v2 0/4] selftests/ftrace: Add a boottime tracing test framework Masami Hiramatsu (Google)
` (2 preceding siblings ...)
2026-08-11 15:34 ` [PATCH v2 3/4] selftests/ftrace: Add kernel cmdline " Masami Hiramatsu (Google)
@ 2026-08-11 15:34 ` Masami Hiramatsu (Google)
3 siblings, 0 replies; 5+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-11 15:34 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel,
linux-kselftest
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Add test cases for persistent ring buffer (reserve_mem= combined
with trace_instance=) and backup instance (trace_instance=backup=boot_map).
These test cases verify:
- persistent-01-reserve-mem: Memory reservation via reserve_mem=
and trace_instance=boot_map@trace. Verifies trace data retention in
the boot_map instance across guest crash/reboot via sysrq-trigger.
- persistent-02-backup-instance: Backup instance creation via
trace_instance=backup=boot_map. Verifies that previous boot trace
log is preserved in the backup instance on the subsequent boot.
These test cases specify '# REBOOT: 1' to enable multi-boot guest
crash/reboot testing with doubled QEMU timeout.
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
Changes in v2:
- Increase reserve_mem alignment to 32M (reserve_mem=12M:32M:trace) to
ensure stable physical memory placement across KASLR reboots.
---
.../cmdlines/persistent-01-reserve-mem.cmdline | 1 +
.../cmdlines/persistent-02-backup-instance.cmdline | 1 +
.../boottime/tests/persistent-01-reserve-mem.sh | 28 ++++++++++++++
.../tests/persistent-02-backup-instance.sh | 40 ++++++++++++++++++++
4 files changed, 70 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/persistent-01-reserve-mem.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/cmdlines/persistent-02-backup-instance.cmdline
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/persistent-01-reserve-mem.sh
create mode 100644 tools/testing/selftests/ftrace/boottime/tests/persistent-02-backup-instance.sh
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-01-reserve-mem.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-01-reserve-mem.cmdline
new file mode 100644
index 000000000000..c69eeb27deb6
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-01-reserve-mem.cmdline
@@ -0,0 +1 @@
+reserve_mem=12M:32M:trace trace_instance=boot_map@trace
diff --git a/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-02-backup-instance.cmdline b/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-02-backup-instance.cmdline
new file mode 100644
index 000000000000..43217c986ca1
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/cmdlines/persistent-02-backup-instance.cmdline
@@ -0,0 +1 @@
+reserve_mem=12M:32M:trace trace_instance=boot_map@trace trace_instance=backup=boot_map
diff --git a/tools/testing/selftests/ftrace/boottime/tests/persistent-01-reserve-mem.sh b/tools/testing/selftests/ftrace/boottime/tests/persistent-01-reserve-mem.sh
new file mode 100644
index 000000000000..49abaf518481
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/persistent-01-reserve-mem.sh
@@ -0,0 +1,28 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check persistent ring buffer across guest crash/reboot
+# REBOOT: 1
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -f "$TRACEDIR/instances/boot_map/trace" ]; then
+ echo "FAIL: persistent trace instance boot_map/trace file missing"
+ exit 1
+fi
+
+# Check if Boot 1 marker was already written
+if grep -q "BOOT1_MARKER" "$TRACEDIR/instances/boot_map/trace" 2>/dev/null; then
+ # Second boot: verify persistent ring buffer content from first boot
+ echo "PASS: persistent-01-reserve-mem"
+ exit 0
+fi
+
+# First boot: write marker to persistent buffer and trigger kernel crash/reboot
+echo "BOOT1_MARKER" > "$TRACEDIR/instances/boot_map/trace_marker"
+sync
+
+# Trigger reboot to restart into second boot
+echo b > /proc/sysrq-trigger 2>/dev/null || echo c > /proc/sysrq-trigger 2>/dev/null || true
+sleep 5
+echo "FAIL: reboot trigger failed on first boot"
+exit 1
diff --git a/tools/testing/selftests/ftrace/boottime/tests/persistent-02-backup-instance.sh b/tools/testing/selftests/ftrace/boottime/tests/persistent-02-backup-instance.sh
new file mode 100644
index 000000000000..0b2a2f03ce4f
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/persistent-02-backup-instance.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2026, Google LLC.
+# Check persistent backup instance across guest crash/reboot
+# REBOOT: 1
+TRACEDIR="/sys/kernel/tracing"
+
+# Ensure both boot_map/trace and backup/trace files exist
+if [ ! -f "$TRACEDIR/instances/boot_map/trace" ]; then
+ echo "FAIL: boot_map/trace file missing"
+ exit 1
+fi
+
+if [ ! -f "$TRACEDIR/instances/backup/trace" ]; then
+ echo "FAIL: backup/trace file missing"
+ exit 1
+fi
+
+# Check if BOOT1_MARKER is in boot_map/trace (indicates second boot)
+if grep -q "BOOT1_MARKER" "$TRACEDIR/instances/boot_map/trace" 2>/dev/null; then
+ # Second boot: verify BOOT1_MARKER was copied into backup/trace from Boot 1
+ if grep -q "BOOT1_MARKER" "$TRACEDIR/instances/backup/trace" 2>/dev/null; then
+ echo "PASS: persistent-02-backup-instance"
+ exit 0
+ else
+ echo "FAIL: BOOT1_MARKER found in boot_map/trace" \
+ "but missing from backup/trace on second boot"
+ exit 1
+ fi
+fi
+
+# First boot: write BOOT1_MARKER to boot_map and reboot via sysrq-trigger
+echo "BOOT1_MARKER" > "$TRACEDIR/instances/boot_map/trace_marker"
+sync
+
+# Trigger reboot to restart into second boot
+echo b > /proc/sysrq-trigger 2>/dev/null || echo c > /proc/sysrq-trigger 2>/dev/null || true
+sleep 5
+echo "FAIL: reboot trigger failed on first boot"
+exit 1
^ permalink raw reply related [flat|nested] 5+ messages in thread