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tools/bootconfig: Add a script to generates bootconfig from ftrace
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. Link: https://lkml.kernel.org/r/159704852163.175360.16738029520293360558.stgit@devnote2 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
Steven Rostedt (VMware)
parent
7e66ef0046
commit
2b86062a34
244
tools/bootconfig/scripts/ftrace2bconf.sh
Executable file
244
tools/bootconfig/scripts/ftrace2bconf.sh
Executable file
@ -0,0 +1,244 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0-only
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usage() {
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echo "Dump boot-time tracing bootconfig from ftrace"
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echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]"
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exit 1
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}
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DEBUG=
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while [ x"$1" != x ]; do
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case "$1" in
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"--debug")
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DEBUG=$1;;
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-*)
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usage
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;;
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esac
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shift 1
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done
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if [ x"$DEBUG" != x ]; then
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set -x
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fi
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TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
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if [ -z "$TRACEFS" ]; then
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if ! grep -wq debugfs /proc/mounts; then
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echo "Error: No tracefs/debugfs was mounted."
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exit 1
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fi
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TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
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if [ ! -d $TRACEFS ]; then
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echo "Error: ftrace is not enabled on this kernel." 1>&2
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exit 1
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fi
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fi
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######## main #########
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set -e
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emit_kv() { # key =|+= value
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echo "$@"
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}
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global_options() {
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val=`cat $TRACEFS/max_graph_depth`
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[ $val != 0 ] && emit_kv kernel.fgraph_max_depth = $val
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if grep -qv "^#" $TRACEFS/set_graph_function $TRACEFS/set_graph_notrace ; then
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cat 1>&2 << EOF
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# WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory.
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EOF
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fi
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}
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kprobe_event_options() {
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cat $TRACEFS/kprobe_events | while read p args; do
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case $p in
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r*)
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cat 1>&2 << EOF
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# WARN: A return probe found but it is not supported by bootconfig. Skip it.
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EOF
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continue;;
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esac
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p=${p#*:}
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event=${p#*/}
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group=${p%/*}
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if [ $group != "kprobes" ]; then
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cat 1>&2 << EOF
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# WARN: kprobes group name $group is changed to "kprobes" for bootconfig.
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EOF
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fi
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emit_kv $PREFIX.event.kprobes.$event.probes += $args
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done
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}
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synth_event_options() {
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cat $TRACEFS/synthetic_events | while read event fields; do
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emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"`
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done
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}
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# Variables resolver
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DEFINED_VARS=
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UNRESOLVED_EVENTS=
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defined_vars() { # event-dir
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grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*='
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}
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referred_vars() {
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grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
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}
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per_event_options() { # event-dir
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evdir=$1
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# Check the special event which has no filter and no trigger
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[ ! -f $evdir/filter ] && return
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if grep -q "^hist:" $evdir/trigger; then
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# hist action can refer the undefined variables
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__vars=`defined_vars $evdir`
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for v in `referred_vars $evdir`; do
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if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then
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# $v is not defined yet, defer it
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UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir"
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return;
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fi
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done
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DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir`
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fi
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grep -v "^#" $evdir/trigger | while read action active; do
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emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
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done
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# enable is not checked; this is done by set_event in the instance.
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val=`cat $evdir/filter`
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if [ "$val" != "none" ]; then
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emit_kv $PREFIX.event.$group.$event.filter = "$val"
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fi
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}
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retry_unresolved() {
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unresolved=$UNRESOLVED_EVENTS
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UNRESOLVED_EVENTS=
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for evdir in $unresolved; do
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event=${evdir##*/}
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group=${evdir%/*}; group=${group##*/}
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per_event_options $evdir
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done
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}
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event_options() {
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# PREFIX and INSTANCE must be set
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if [ $PREFIX = "ftrace" ]; then
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# define the dynamic events
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kprobe_event_options
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synth_event_options
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fi
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for group in `ls $INSTANCE/events/` ; do
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[ ! -d $INSTANCE/events/$group ] && continue
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for event in `ls $INSTANCE/events/$group/` ;do
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[ ! -d $INSTANCE/events/$group/$event ] && continue
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per_event_options $INSTANCE/events/$group/$event
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done
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done
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retry=0
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while [ $retry -lt 3 ]; do
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retry_unresolved
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retry=$((retry + 1))
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done
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if [ "$UNRESOLVED_EVENTS" ]; then
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cat 1>&2 << EOF
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! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables.
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EOF
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fi
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}
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is_default_trace_option() { # option
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grep -qw $1 << EOF
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print-parent
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nosym-offset
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nosym-addr
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noverbose
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noraw
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nohex
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nobin
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noblock
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trace_printk
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annotate
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nouserstacktrace
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nosym-userobj
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noprintk-msg-only
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context-info
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nolatency-format
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record-cmd
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norecord-tgid
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overwrite
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nodisable_on_free
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irq-info
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markers
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noevent-fork
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nopause-on-trace
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function-trace
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nofunction-fork
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nodisplay-graph
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nostacktrace
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notest_nop_accept
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notest_nop_refuse
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EOF
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}
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instance_options() { # [instance-name]
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if [ $# -eq 0 ]; then
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PREFIX="ftrace"
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INSTANCE=$TRACEFS
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else
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PREFIX="ftrace.instance.$1"
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INSTANCE=$TRACEFS/instances/$1
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fi
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val=
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for i in `cat $INSTANCE/trace_options`; do
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is_default_trace_option $i && continue
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val="$val, $i"
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done
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[ "$val" ] && emit_kv $PREFIX.options = "${val#,}"
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val="local"
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for i in `cat $INSTANCE/trace_clock` ; do
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[ "${i#*]}" ] && continue
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i=${i%]}; val=${i#[}
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done
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[ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val
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val=`cat $INSTANCE/buffer_size_kb`
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if echo $val | grep -vq "expanded" ; then
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emit_kv $PREFIX.buffer_size = $val"KB"
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fi
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if grep -q "is allocated" $INSTANCE/snapshot ; then
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emit_kv $PREFIX.alloc_snapshot
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fi
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val=`cat $INSTANCE/tracing_cpumask`
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if [ `echo $val | sed -e s/f//g`x != x ]; then
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emit_kv $PREFIX.cpumask = $val
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fi
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val=
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for i in `cat $INSTANCE/set_event`; do
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val="$val, $i"
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done
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[ "$val" ] && emit_kv $PREFIX.events = "${val#,}"
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val=`cat $INSTANCE/current_tracer`
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[ $val != nop ] && emit_kv $PREFIX.tracer = $val
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if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
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cat 1>&2 << EOF
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# WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory.
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EOF
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fi
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event_options
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}
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global_options
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instance_options
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for i in `ls $TRACEFS/instances` ; do
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instance_options $i
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done
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