From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A90C4C433DF for ; Mon, 10 Aug 2020 08:35:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 817F420716 for ; Mon, 10 Aug 2020 08:35:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597048530; bh=4BSR689DcTtffCAXQrwEP55IGcmgIVBSQnQXz56FHvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QUbmnxgTANUAKb9hDma89pmqr1qS3OjRaulV9ozCbfXrM0cXL3xIfZ/EnU4PjrF5I BNh3X0jcDNOZlbwtWT++QW9KmHlN55RSnvjKMhYQdyPi2Yf7eGPf24uDQ1SPj9SXaf 9foiAAybDS6LYRYbUKPCK83CwkqqmL9bohzIgpgY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726645AbgHJIf3 (ORCPT ); Mon, 10 Aug 2020 04:35:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:50652 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbgHJIf1 (ORCPT ); Mon, 10 Aug 2020 04:35:27 -0400 Received: from localhost.localdomain (unknown [180.22.250.62]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C78322065C; Mon, 10 Aug 2020 08:35:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597048526; bh=4BSR689DcTtffCAXQrwEP55IGcmgIVBSQnQXz56FHvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BGYiwD4UBAnuXMNe6FAbgAnDG7YNpFwKB/RrE/ojd1hn/WsbHaUy3IMgrx3HyXcoA yBzPGtJYrDD9iuyl9Gpx2jLDExsAkRTnaR7TAfM2QDFnUicK7F6LcfNNNdsqWbd9pA X9G3trqILOAnLkURr6lTtrFTzskjoq1tVNDk6/xU= From: Masami Hiramatsu To: Steven Rostedt Cc: LKML , Ingo Molnar , Masami Hiramatsu Subject: [PATCH 5/6] tools/bootconfig: Add a script to generates bootconfig from ftrace Date: Mon, 10 Aug 2020 17:35:21 +0900 Message-Id: <159704852163.175360.16738029520293360558.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <159704847064.175360.3292152056631660862.stgit@devnote2> References: <159704847064.175360.3292152056631660862.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a ftrace2bconf.sh under tools/bootconfig/scripts which generates a bootconfig file from the current ftrace settings. To read the ftrace settings, ftrace2bconf.sh requires the root privilege (or sudo). The ftrace2bconf.sh will output the bootconfig to stdout and error messages to stderr, so usually you'll run it as # ftrace2bconf.sh > ftrace.bconf Note that some ftrace configurations are not supported. For example, function-call/callgraph trace/notrace settings are not supported because the wildcard has been expanded and lost in the ftrace anymore. Signed-off-by: Masami Hiramatsu --- tools/bootconfig/scripts/ftrace2bconf.sh | 244 ++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100755 tools/bootconfig/scripts/ftrace2bconf.sh diff --git a/tools/bootconfig/scripts/ftrace2bconf.sh b/tools/bootconfig/scripts/ftrace2bconf.sh new file mode 100755 index 000000000000..6c0d4b61e0c2 --- /dev/null +++ b/tools/bootconfig/scripts/ftrace2bconf.sh @@ -0,0 +1,244 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-only + +usage() { + echo "Dump boot-time tracing bootconfig from ftrace" + echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]" + exit 1 +} + +DEBUG= +while [ x"$1" != x ]; do + case "$1" in + "--debug") + DEBUG=$1;; + -*) + usage + ;; + esac + shift 1 +done + +if [ x"$DEBUG" != x ]; then + set -x +fi + +TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "` +if [ -z "$TRACEFS" ]; then + if ! grep -wq debugfs /proc/mounts; then + echo "Error: No tracefs/debugfs was mounted." + exit 1 + fi + TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing + if [ ! -d $TRACEFS ]; then + echo "Error: ftrace is not enabled on this kernel." 1>&2 + exit 1 + fi +fi + +######## main ######### + +set -e + +emit_kv() { # key =|+= value + echo "$@" +} + +global_options() { + val=`cat $TRACEFS/max_graph_depth` + [ $val != 0 ] && emit_kv kernel.fgraph_max_depth = $val + if grep -qv "^#" $TRACEFS/set_graph_function $TRACEFS/set_graph_notrace ; then + cat 1>&2 << EOF +# WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory. +EOF + fi +} + +kprobe_event_options() { + cat $TRACEFS/kprobe_events | while read p args; do + case $p in + r*) + cat 1>&2 << EOF +# WARN: A return probe found but it is not supported by bootconfig. Skip it. +EOF + continue;; + esac + p=${p#*:} + event=${p#*/} + group=${p%/*} + if [ $group != "kprobes" ]; then + cat 1>&2 << EOF +# WARN: kprobes group name $group is changed to "kprobes" for bootconfig. +EOF + fi + emit_kv $PREFIX.event.kprobes.$event.probes += $args + done +} + +synth_event_options() { + cat $TRACEFS/synthetic_events | while read event fields; do + emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"` + done +} + +# Variables resolver +DEFINED_VARS= +UNRESOLVED_EVENTS= + +defined_vars() { # event-dir + grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*=' +} +referred_vars() { + grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*' +} + +per_event_options() { # event-dir + evdir=$1 + # Check the special event which has no filter and no trigger + [ ! -f $evdir/filter ] && return + + if grep -q "^hist:" $evdir/trigger; then + # hist action can refer the undefined variables + __vars=`defined_vars $evdir` + for v in `referred_vars $evdir`; do + if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then + # $v is not defined yet, defer it + UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir" + return; + fi + done + DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir` + fi + grep -v "^#" $evdir/trigger | while read action active; do + emit_kv $PREFIX.event.$group.$event.actions += \'$action\' + done + + # enable is not checked; this is done by set_event in the instance. + val=`cat $evdir/filter` + if [ "$val" != "none" ]; then + emit_kv $PREFIX.event.$group.$event.filter = "$val" + fi +} + +retry_unresolved() { + unresolved=$UNRESOLVED_EVENTS + UNRESOLVED_EVENTS= + for evdir in $unresolved; do + event=${evdir##*/} + group=${evdir%/*}; group=${group##*/} + per_event_options $evdir + done +} + +event_options() { + # PREFIX and INSTANCE must be set + if [ $PREFIX = "ftrace" ]; then + # define the dynamic events + kprobe_event_options + synth_event_options + fi + for group in `ls $INSTANCE/events/` ; do + [ ! -d $INSTANCE/events/$group ] && continue + for event in `ls $INSTANCE/events/$group/` ;do + [ ! -d $INSTANCE/events/$group/$event ] && continue + per_event_options $INSTANCE/events/$group/$event + done + done + retry=0 + while [ $retry -lt 3 ]; do + retry_unresolved + retry=$((retry + 1)) + done + if [ "$UNRESOLVED_EVENTS" ]; then + cat 1>&2 << EOF +! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables. +EOF + fi +} + +is_default_trace_option() { # option +grep -qw $1 << EOF +print-parent +nosym-offset +nosym-addr +noverbose +noraw +nohex +nobin +noblock +trace_printk +annotate +nouserstacktrace +nosym-userobj +noprintk-msg-only +context-info +nolatency-format +record-cmd +norecord-tgid +overwrite +nodisable_on_free +irq-info +markers +noevent-fork +nopause-on-trace +function-trace +nofunction-fork +nodisplay-graph +nostacktrace +notest_nop_accept +notest_nop_refuse +EOF +} + +instance_options() { # [instance-name] + if [ $# -eq 0 ]; then + PREFIX="ftrace" + INSTANCE=$TRACEFS + else + PREFIX="ftrace.instance.$1" + INSTANCE=$TRACEFS/instances/$1 + fi + val= + for i in `cat $INSTANCE/trace_options`; do + is_default_trace_option $i && continue + val="$val, $i" + done + [ "$val" ] && emit_kv $PREFIX.options = "${val#,}" + val="local" + for i in `cat $INSTANCE/trace_clock` ; do + [ "${i#*]}" ] && continue + i=${i%]}; val=${i#[} + done + [ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val + val=`cat $INSTANCE/buffer_size_kb` + if echo $val | grep -vq "expanded" ; then + emit_kv $PREFIX.buffer_size = $val"KB" + fi + if grep -q "is allocated" $INSTANCE/snapshot ; then + emit_kv $PREFIX.alloc_snapshot + fi + val=`cat $INSTANCE/tracing_cpumask` + if [ `echo $val | sed -e s/f//g`x != x ]; then + emit_kv $PREFIX.cpumask = $val + fi + + val= + for i in `cat $INSTANCE/set_event`; do + val="$val, $i" + done + [ "$val" ] && emit_kv $PREFIX.events = "${val#,}" + val=`cat $INSTANCE/current_tracer` + [ $val != nop ] && emit_kv $PREFIX.tracer = $val + if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then + cat 1>&2 << EOF +# WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory. +EOF + fi + event_options +} + +global_options +instance_options +for i in `ls $TRACEFS/instances` ; do + instance_options $i +done