From nobody Tue Sep 29 06:08:26 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E73630BF4F; Wed, 12 Aug 2026 00:43:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786495424; cv=none; b=u3HfeqAiZfCpV3YNYyDx1iKGY+To00COIDnIxRsIgDp5K9hEppSeOiyJ9aqn57BThWq2iCdO1F9lV4DzVqOlzskE3A5baka5ZfIZqdOFUY20MNfh2d25JjnCGc+8GnVp9NcjC7ZWXvY6K8xAJUWW6wKo6ChegUSPVgFLDPy5KRA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786495424; c=relaxed/simple; bh=xKt669PA2XgrDzMUHb8VwQgC1KdI4Dkxy6/f3/YEInI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HtrjsUoFMzPWeVn0odt7pN54H7B+RTQagrn0YPwebdaOjZJIL26JP4HVld/WEr5eftkk26hV14rjnhfyhPHxyTldOyNJ+gOrJXQrP1Y/JJJpA3p8oIgxWI1ShSoL+cw9FUrtT+6cb5R6x6cTzNHZ6GRqzlNjheIyQ96dYmA1y54= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UYIcJ1ci; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UYIcJ1ci" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35CF51F000E9; Wed, 12 Aug 2026 00:43:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786495422; bh=xCWq/sHOsV+Mxg6OCiVsGgx3CvyKllQVTBr7t74D7AQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UYIcJ1ciOGKhtaRWvTpxw2xvyTCO/Ol8tu96rQhjYGDAV9RMbl9Ct3lK5EAVeSFsB DYs19671/yZwHKQYNAAqio1Q7u0UJlXamKcheeCsidkilofSJVenunkK56pnW7QjSB k+JDcoXqnJ1TlFbM10xfQgSCXUvzKALqCv54MCmAbFiNAAelJhEAyxRJSmC6MEtWwT uGZ+dxXRn0C3DnMw1rjmiPXJpUF2EBDbwLrV1dxbQZxcEd//3FRbx8E/4Qrz3QVVo7 j2yP8NgU+l7P4A6qJPaVCTByKtZ9YnTxBUoevpJHV3wIHsz3oGfi1l2I6hb+XLsXEH spEoJqlA/3HIw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu , Shuah Khan Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v3 1/4] selftests/ftrace: Add generic boot tracing test framework Date: Wed, 12 Aug 2026 09:43:38 +0900 Message-ID: <178649541846.438282.672153252242971310.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178649540853.438282.4271870161169100680.stgit@devnote2> References: <178649540853.438282.4271870161169100680.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) 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) --- Changes in v3: - Require file command and check kernel binary architecture via file -bL instead of matching kernel path string in run_boottime_test.sh. - Use 'cp -L' when copying BUSYBOX into initramfs to dereference symbolic links. - Use 'ln -sf' when creating BusyBox applet symlinks in initramfs. - Add support for '# APPLETS: ' header in test scripts to dynamically create BusyBox applet symlinks in initramfs. - Update boottime test README to document file command dependency and '# APPLETS:' header syntax. 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=20 tools/testing/selftests/ftrace/boottime-ktap | 6=20 tools/testing/selftests/ftrace/boottime/Makefile | 10=20 tools/testing/selftests/ftrace/boottime/README | 74 ++++ .../selftests/ftrace/boottime/run_boottime_test.sh | 403 ++++++++++++++++= ++++ tools/testing/selftests/ftrace/config | 6=20 6 files changed, 501 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_te= st.sh diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selfte= sts/ftrace/Makefile index 7c12263f8260..3d41f9545683 100644 --- a/tools/testing/selftests/ftrace/Makefile +++ b/tools/testing/selftests/ftrace/Makefile @@ -2,8 +2,8 @@ all: =20 TEST_PROGS_EXTENDED :=3D ftracetest -TEST_PROGS :=3D ftracetest-ktap -TEST_FILES :=3D test.d settings +TEST_PROGS :=3D ftracetest-ktap boottime-ktap +TEST_FILES :=3D test.d settings boottime EXTRA_CLEAN :=3D $(OUTPUT)/logs/* =20 TEST_GEN_FILES :=3D poll diff --git a/tools/testing/selftests/ftrace/boottime-ktap b/tools/testing/s= elftests/ftrace/boottime-ktap new file mode 100755 index 000000000000..1fed68c8a944 --- /dev/null +++ b/tools/testing/selftests/ftrace/boottime-ktap @@ -0,0 +1,6 @@ +#!/bin/sh -e +# SPDX-License-Identifier: GPL-2.0-only +# +# boottime-ktap: Wrapper to integrate boottime tracing test framework with= kselftest runner + +exec ./boottime/run_boottime_test.sh "$@" diff --git a/tools/testing/selftests/ftrace/boottime/Makefile b/tools/testi= ng/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..1eb0191d75d4 --- /dev/null +++ b/tools/testing/selftests/ftrace/boottime/README @@ -0,0 +1,74 @@ +Boot Tracing Test Suite +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +This directory contains an automated test framework to verify kernel boot +tracing configurations (bootconfig, kernel command-line tracing options, a= nd +persistent ring buffers) during early boot. + +Overview +-------- +The test runner (`run_boottime_test.sh`) constructs a lightweight initramf= s with +busybox and a tracefs checker script from `tests/`, attaches optional boot= configs +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/.sh`, the harness dynamically detects: +- `bootconfigs/.bconf` or `.bconf`: Bootconfig configuration f= ile. +- `cmdlines/.cmdline` or `# CMDLINE: ` header in script: Kerne= l boot parameters. +- `qemuopts/.qemuopts` or `# QEMUOPTS: ` header in script: Add= itional QEMU CLI arguments. +- `# APPLETS: ` header in script: Additional BusyBox applet symli= nks to create in initramfs. +- `# 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 host= s) +- `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) +- `file` (standard file architecture identifier) +- `cpio` (standard archiver) +- `timeout` (standard coreutils execution timer) + +Required Kernel Configurations +------------------------------ +The kernel binary under test must be compiled with: +- `CONFIG_BOOT_CONFIG=3Dy` +- `CONFIG_BOOTTIME_TRACING=3Dy` +- `CONFIG_MAGIC_SYSRQ=3Dy` (for guest reboot and poweroff) + +Additional feature-specific config options enable respective testcases: +- `CONFIG_KPROBE_EVENTS=3Dy` (for kprobe tests) +- `CONFIG_SYNTH_EVENTS=3Dy` (for synthetic event tests) +- `CONFIG_EPROBE_EVENTS=3Dy` (for eprobe tests) +- `CONFIG_FPROBE_EVENTS=3Dy` (for fprobe and tracepoint probe tests) +- `CONFIG_FUNCTION_TRACER=3Dy` (for tracer options) +- `CONFIG_RESERVE_MEM=3Dy` (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..6e8593d5a2c5 --- /dev/null +++ b/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh @@ -0,0 +1,403 @@ +#!/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 p= arameters, +# boots QEMU, and verifies tracefs configuration using test scripts. + +set -e + +SCRIPT_DIR=3D"$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" +if [ -d "$SCRIPT_DIR/boottime" ]; then + SCRIPT_DIR=3D"$SCRIPT_DIR/boottime" +fi +KERNEL_SRC=3D"$(cd "$SCRIPT_DIR/../../../../.." && pwd)" + +# Source KTAP helpers +if [ -f "$SCRIPT_DIR/../../kselftest/ktap_helpers.sh" ]; then + KSELFTEST_DIR=3D"$(cd "$SCRIPT_DIR/../../kselftest" && pwd)" +elif [ -f "$SCRIPT_DIR/../kselftest/ktap_helpers.sh" ]; then + KSELFTEST_DIR=3D"$(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=3D"${BOOTCONFIG:-"$KERNEL_SRC/tools/bootconfig/bootconfig"}" +KERNEL=3D"${KERNEL:-"$KERNEL_SRC/arch/x86/boot/bzImage"}" +QEMU=3D"${QEMU:-"qemu-system-x86_64"}" +BUSYBOX=3D"${BUSYBOX:-"$(which busybox 2>/dev/null || echo "/usr/bin/busyb= ox")"}" +TIMEOUT=3D"${TIMEOUT:-60s}" +LOGDIR=3D"${LOGDIR:-""}" +TARGET_TEST=3D"all" + +BUSYBOX_APPLETS=3D( + 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: $BOOTCO= NFIG)" + 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 'al= l'" + echo " -h, --help Show this help message" + exit 1 +} + +while [ $# -gt 0 ]; do + case "$1" in + -b|--bootconfig) + BOOTCONFIG=3D"$2" + shift 2 + ;; + -k|--kernel) + KERNEL=3D"$2" + shift 2 + ;; + -q|--qemu) + QEMU=3D"$2" + shift 2 + ;; + -B|--busybox) + BUSYBOX=3D"$2" + shift 2 + ;; + -T|--timeout) + TIMEOUT=3D"$2" + shift 2 + ;; + -l|--logdir) + LOGDIR=3D"$2" + shift 2 + ;; + -t|--test) + TARGET_TEST=3D"$2" + shift 2 + ;; + -h|--help) + usage + ;; + *) + echo "Unknown option: $1" + usage + ;; + esac +done + +# Check host architecture +HOST_ARCH=3D"$(uname -m)" +case "$HOST_ARCH" in + x86_64|i686|i386|x86) + ;; + *) + if [ "$KERNEL" =3D "$KERNEL_SRC/arch/x86/boot/bzImage" ]; then + ktap_print_header + ktap_skip_all \ + "Default boot tracing test is x86 only ($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=3D"$(which bootconfig 2>/dev/null || true)" + fi +fi + +if [ ! -x "$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 $BUSYBOX" + exit 0 +fi + +# Verify file command existence and architecture compatibility +if ! command -v file >/dev/null 2>&1; then + ktap_print_header + ktap_skip_all "file tool not found" + exit 0 +fi + +KERNEL_INFO=3D"$(file -bL "$KERNEL" 2>/dev/null || true)" +case "$KERNEL_INFO" in + *x86*) + ;; + *) + ktap_print_header + ktap_skip_all "Kernel architecture is not x86 ($KERNEL_INFO)" + exit 0 + ;; +esac + +BUSYBOX_INFO=3D"$(file -bL "$BUSYBOX" 2>/dev/null || true)" +case "$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 + +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=3D"$1" + if [[ "$val" =3D~ ^([0-9]+)([a-z]*)$ ]]; then + local num=3D"${BASH_REMATCH[1]}" + local unit=3D"${BASH_REMATCH[2]}" + echo "$((num * 2))$unit" + else + echo "120s" + fi +} + +run_single_test() { + local test_script=3D"$1" + local name + local dir + name=3D"$(basename "$test_script" .sh)" + dir=3D"$(dirname "$test_script")" + + local bconf_file=3D"" + if [ -f "$SCRIPT_DIR/bootconfigs/$name.bconf" ]; then + bconf_file=3D"$SCRIPT_DIR/bootconfigs/$name.bconf" + elif [ -f "$dir/$name.bconf" ]; then + bconf_file=3D"$dir/$name.bconf" + fi + + local test_cmdline=3D"" + if [ -f "$SCRIPT_DIR/cmdlines/$name.cmdline" ]; then + test_cmdline=3D"$(cat "$SCRIPT_DIR/cmdlines/$name.cmdline")" + elif [ -f "$dir/$name.cmdline" ]; then + test_cmdline=3D"$(cat "$dir/$name.cmdline")" + fi + + local inline_cmdline + inline_cmdline=3D"$(grep -E '^# *CMDLINE:' "$test_script" | sed 's/^# *CM= DLINE://' | xargs || true)" + if [ -n "$inline_cmdline" ]; then + test_cmdline=3D"$test_cmdline $inline_cmdline" + fi + + local test_qemuopts=3D"" + if [ -f "$SCRIPT_DIR/qemuopts/$name.qemuopts" ]; then + test_qemuopts=3D"$(cat "$SCRIPT_DIR/qemuopts/$name.qemuopts")" + elif [ -f "$dir/$name.qemuopts" ]; then + test_qemuopts=3D"$(cat "$dir/$name.qemuopts")" + fi + + local inline_qemuopts + inline_qemuopts=3D"$(grep -E '^# *QEMUOPTS:' "$test_script" | sed 's/^# *= QEMUOPTS://' | xargs || true)" + if [ -n "$inline_qemuopts" ]; then + test_qemuopts=3D"$test_qemuopts $inline_qemuopts" + fi + + local test_timeout=3D"$TIMEOUT" + local inline_timeout + inline_timeout=3D"$(grep -E '^# *TIMEOUT:' "$test_script" | sed 's/^# *TI= MEOUT://' | xargs || true)" + if [ -n "$inline_timeout" ]; then + test_timeout=3D"$inline_timeout" + fi + + local is_reboot=3D0 + if grep -q -E '^# *REBOOT: *1' "$test_script" || [ -f "$dir/$name.reboot"= ]; then + is_reboot=3D1 + fi + + local effective_timeout=3D"$test_timeout" + if [ "$is_reboot" -eq 1 ]; then + effective_timeout=3D"$(double_timeout "$test_timeout")" + fi + + local workdir + workdir=3D"$(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 test_applets=3D("${BUSYBOX_APPLETS[@]}") + local inline_applets + inline_applets=3D"$(grep -E '^# *APPLETS:' "$test_script" | sed 's/^# *AP= PLETS://' | xargs || true)" + if [ -n "$inline_applets" ]; then + read -r -a extra_applets <<< "$inline_applets" || true + test_applets+=3D("${extra_applets[@]}") + fi + + local rootfs=3D"$workdir/rootfs" + mkdir -p "$rootfs"/{bin,sbin,etc,proc,sys,dev,tmp} + + cp -L "$BUSYBOX" "$rootfs/bin/busybox" + chmod +x "$rootfs/bin/busybox" + (cd "$rootfs/bin" && for applet in "${test_applets[@]}"; do ln -sf busybo= x "$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=3D$? + +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 "$rootfs/bin/check_test.sh" + + local initramfs=3D"$workdir/initramfs.cpio" + (cd "$rootfs" && find . | cpio -o -H newc --quiet) > "$initramfs" + + if [ -n "$bconf_file" ] && [ -f "$bconf_file" ]; then + "$BOOTCONFIG" -a "$bconf_file" "$initramfs" > /dev/null + fi + + + local logfile + local base_cmdline=3D"bootconfig console=3Dtty0 console=3DttyS0 panic=3D-= 1" + if [ -n "$test_cmdline" ]; then + base_cmdline=3D"$base_cmdline $test_cmdline" + fi + + if [ -n "$LOGDIR" ]; then + mkdir -p "$LOGDIR" + logfile=3D"$LOGDIR/$name.log" + base_cmdline=3D"$base_cmdline dump_bconf" + else + logfile=3D"$workdir/qemu.log" + base_cmdline=3D"quiet $base_cmdline" + fi + + local qemu_args=3D() + if [ -n "$test_qemuopts" ]; then + read -r -d '' -a qemu_args <<< "$test_qemuopts" || true + fi + + if [ "$is_reboot" -ne 1 ]; then + qemu_args+=3D("-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 $name:" + while IFS=3D read -r line; do + ktap_print_msg "$line" + done < "$logfile" + fi + + rm -rf "$workdir" + trap - EXIT + return 0 +} + +TEST_SCRIPTS=3D() +if [ -d "$SCRIPT_DIR/tests" ]; then + while IFS=3D read -r f; do + [ -n "$f" ] && TEST_SCRIPTS+=3D("$f") + done < <(find "$SCRIPT_DIR/tests" -type f -name "*.sh" | sort) +fi + +TOTAL_TESTS=3D0 +for test_script in "${TEST_SCRIPTS[@]}"; do + name=3D"$(basename "$test_script" .sh)" + if [ "$TARGET_TEST" !=3D "all" ] && [ "$TARGET_TEST" !=3D "$name" ]; then + continue + fi + TOTAL_TESTS=3D$((TOTAL_TESTS + 1)) +done + +ktap_print_header +ktap_set_plan "$TOTAL_TESTS" + +for test_script in "${TEST_SCRIPTS[@]}"; do + name=3D"$(basename "$test_script" .sh)" + + if [ "$TARGET_TEST" !=3D "all" ] && [ "$TARGET_TEST" !=3D "$name" ]; then + continue + fi + + run_single_test "$test_script" +done + +ktap_finished diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftest= s/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=3Dy +CONFIG_BOOTTIME_TRACING=3Dy CONFIG_BPF_SYSCALL=3Dy CONFIG_DEBUG_INFO_BTF=3Dy CONFIG_DEBUG_INFO_DWARF4=3Dy @@ -8,22 +10,26 @@ CONFIG_FTRACE=3Dy CONFIG_FTRACE_SYSCALLS=3Dy CONFIG_FUNCTION_GRAPH_RETVAL=3Dy CONFIG_FUNCTION_PROFILER=3Dy +CONFIG_FUNCTION_TRACER=3Dy CONFIG_HIST_TRIGGERS=3Dy CONFIG_IRQSOFF_TRACER=3Dy CONFIG_KALLSYMS_ALL=3Dy CONFIG_KPROBES=3Dy CONFIG_KPROBE_EVENTS=3Dy +CONFIG_MAGIC_SYSRQ=3Dy CONFIG_MODULES=3Dy CONFIG_MODULE_UNLOAD=3Dy CONFIG_PREEMPTIRQ_DELAY_TEST=3Dm CONFIG_PREEMPT_TRACER=3Dy CONFIG_PROBE_EVENTS_BTF_ARGS=3Dy +CONFIG_RESERVE_MEM=3Dy CONFIG_SAMPLES=3Dy CONFIG_SAMPLE_FTRACE_DIRECT=3Dm CONFIG_SAMPLE_TRACE_EVENTS=3Dm CONFIG_SAMPLE_TRACE_PRINTK=3Dm CONFIG_SCHED_TRACER=3Dy CONFIG_STACK_TRACER=3Dy +CONFIG_SYNTH_EVENTS=3Dy CONFIG_TRACER_SNAPSHOT=3Dy CONFIG_UPROBES=3Dy CONFIG_UPROBE_EVENTS=3Dy From nobody Tue Sep 29 06:08:26 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6596135E1BC; 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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="O9VQDWwq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A7041F000E9; Wed, 12 Aug 2026 00:43:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786495432; bh=8rhLh4T/FGEzcoW4SaLoVPimMTJUUICBdRkRnALrYRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=O9VQDWwqElZsWQI1ABULsl0mz4eWIOoRa0kQNDgKsU3Ofl2aOdrMy+ZLY2Wzmo9lw 31kqmZ/xVvJvM3iUqS8ab/VzFPBn2hDAI3Uq9sxfNEbQMyMRbgfme1TKFzeadEyoRV UXv4yeQ7mNzz1KXROg80GoJRvXsCmvzgYNsSdHWmrmhfKRRCCjWSB5AyKNzz7+BhBL oPsgc9T9yPSyfRWdU3kcUEtjO0/feFiorFBIC9TKkE0QE+K3R0JIpUXuS2o866xOnt b7JpQNd+kSxWREi3jr7I1aMuvT4uE6QQcxoEGtKSxGMatzEGYb8KyTphEUUG09grlB t7S36qPWe1aGQ== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu , Shuah Khan Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v3 2/4] selftests/ftrace: Add boot-time tracing testcases Date: Wed, 12 Aug 2026 09:43:48 +0900 Message-ID: <178649542809.438282.16167291066989252262.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178649540853.438282.4271870161169100680.stgit@devnote2> References: <178649540853.438282.4271870161169100680.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) 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) --- .../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-instan= ce.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 =3D "vfs_read $arg1" + enable +} diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.b= conf 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 =3D "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 =3D "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 =3D "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 =3D "sched_switch" + enable +} diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instanc= e.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.b= conf 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/t= ools/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=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +fi + +if [ ! -d "$TRACEDIR/events/kprobes/vfs_read" ]; then + echo "FAIL: kprobe event kprobes/vfs_read does not exist" + exit 1 +fi + +ENABLE=3D$(cat "$TRACEDIR/events/kprobes/vfs_read/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: kprobe event kprobes/vfs_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 01-kprobe" +exit 0 diff --git a/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh b/to= ols/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=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +fi + +if [ ! -d "$TRACEDIR/events/synthetic/boot_lat" ]; then + echo "FAIL: synthetic event synthetic/boot_lat does not exist" + exit 1 +fi + +ENABLE=3D$(cat "$TRACEDIR/events/synthetic/boot_lat/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: synthetic event synthetic/boot_lat is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 02-synth" +exit 0 diff --git a/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh b/t= ools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh new file mode 100644 index 000000000000..9b3b7ab23c69 --- /dev/null +++ b/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh @@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check eprobe event bootconfig settings on tracefs +TRACEDIR=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +fi + +if [ ! -d "$TRACEDIR/events/eprobes/ep_read" ]; then + echo "FAIL: eprobe event eprobes/ep_read does not exist" + exit 1 +fi + +ENABLE=3D$(cat "$TRACEDIR/events/eprobes/ep_read/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: eprobe event eprobes/ep_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 03-eprobe" +exit 0 diff --git a/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh b/t= ools/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=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +fi + +if [ ! -d "$TRACEDIR/events/fprobes/fp_read" ]; then + echo "FAIL: fprobe event fprobes/fp_read does not exist" + exit 1 +fi + +ENABLE=3D$(cat "$TRACEDIR/events/fprobes/fp_read/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: fprobe event fprobes/fp_read is not enabled ($ENABLE)" + exit 1 +fi + +echo "PASS: 04-fprobe" +exit 0 diff --git a/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh b/t= ools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh new file mode 100644 index 000000000000..810d34055f94 --- /dev/null +++ b/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh @@ -0,0 +1,25 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2026, Google LLC. +# Check tracepoint probe event bootconfig settings on tracefs +TRACEDIR=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +fi + +if [ ! -d "$TRACEDIR/events/tracepoints/tp_sched" ]; then + echo "FAIL: tracepoint probe event tracepoints/tp_sched does not exist" + exit 1 +fi + +ENABLE=3D$(cat "$TRACEDIR/events/tracepoints/tp_sched/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: tracepoint probe event tracepoints/tp_sched is not enabled ($= 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=3D"/sys/kernel/tracing" + +if [ -f /proc/bootconfig ] && grep -q "dump_bconf" /proc/cmdline 2>/dev/nu= ll; then + echo "=3D=3D=3D /proc/bootconfig =3D=3D=3D" + cat /proc/bootconfig + echo "=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D" +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=3D$(cat "$TRACEDIR/instances/foo/events/sched/sched_switch/enable") +if [ "$ENABLE" !=3D "1" ]; then + echo "FAIL: event sched_switch is not enabled in instance foo ($ENABLE)" + exit 1 +fi + +echo "PASS: 06-instance" +exit 0 From nobody Tue Sep 29 06:08:26 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86AA035E1BC; Wed, 12 Aug 2026 00:44:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786495443; cv=none; b=UriZ3/VzE+LKHUHWzqKbv6W2hvTLt+aNc8QfsMZM+uOJXQUNjHIdOtsd7GUNMC71sQE0ImpBGf77z9npuZRulwY1uKwpX+Ji12Eo/KjpHFga1rJHzjbOE/AfTCilIsWc8hDSrQFXv30lA5ZQ/VeJjN/AhGNkQwpe5qL6rikJr5Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; 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b=G1GKhb7qrXa/sUK1kYYdTrHSCVO+52Nv67EXoZJz6A3uTA9uHYKcg63hZDizaV886 +uyGixU+Rm32rlh1ouQ+S1UYFFdDMeMR4ZW1gMDrtDmBZnyhlIp+r91MGCGBhKBwsA bUsR1nm4AK5dlia57Rrf2hPGE9PD1r7eUGj9vvr1YKeSUtllfXXW4d39JXzuT8fA8p PlMDCBl9uoxTizT3yXm2QGBOYJMmmCirYeIqkqWuMVZhuzHIGLgO0Gm7PWrgMwCZkt p/4tf4OeVjn3v4AL9QzGFKgW5UL75Wp6zraQWI3oX2l1rd9250Jp+jmTRf0Q4wtIs6 3s6JDEuFfg0Rw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu , Shuah Khan Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v3 3/4] selftests/ftrace: Add kernel cmdline tracing testcases Date: Wed, 12 Aug 2026 09:43:57 +0900 Message-ID: <178649543741.438282.2638887907664217934.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178649540853.438282.4271870161169100680.stgit@devnote2> References: <178649540853.438282.4271870161169100680.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) 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) --- Changes in v3: - Add '# APPLETS: awk' header to cmdline-03-trace-buf-size.sh to request awk applet in initramfs. 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