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124 lines
3.2 KiB
Bash
Executable File
124 lines
3.2 KiB
Bash
Executable File
#!/bin/bash
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#
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# reset-ftrace - reset state of ftrace, disabling all tracing.
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# Written for Linux ftrace.
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#
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# This may only be of use to ftrace hackers who, in the process of developing
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# ftrace software, often get the subsystem into a partially active state, and
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# would like a quick way to reset state. Check the end of this script for the
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# actually files reset, and add more if you need.
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#
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# USAGE: ./reset-ftrace [-fhq]
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#
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# REQUIREMENTS: FTRACE CONFIG.
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#
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# From perf-tools: https://github.com/brendangregg/perf-tools
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#
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# See the reset-ftrace(8) man page (in perf-tools) for more info.
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#
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# COPYRIGHT: Copyright (c) 2014 Brendan Gregg.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# (http://www.gnu.org/copyleft/gpl.html)
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#
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# 20-Jul-2014 Brendan Gregg Created this.
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tracing=/sys/kernel/debug/tracing
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flock=/var/tmp/.ftrace-lock
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opt_force=0; opt_quiet=0
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function usage {
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cat <<-END >&2
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USAGE: reset-ftrace [-fhq]
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-f # force: delete ftrace lock file
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-q # quiet: reset, but say nothing
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-h # this usage message
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eg,
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reset-ftrace # disable active ftrace session
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END
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exit
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}
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function warn {
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if ! eval "$@"; then
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echo >&2 "WARNING: command failed \"$@\""
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fi
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}
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function die {
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echo >&2 "$@"
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exit 1
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}
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function vecho {
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(( opt_quiet )) && return
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echo "$@"
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}
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# write to file
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function writefile {
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file=$1
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string=$2 # optional
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if [[ ! -w $file ]]; then
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echo >&2 "WARNING: file $file not writable/exists. Skipping."
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return
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fi
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vecho "$file, before:"
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(( ! opt_quiet )) && cat -n $file
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warn "echo $string > $file"
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vecho "$file, after:"
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(( ! opt_quiet )) && cat -n $file
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vecho
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}
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### process options
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while getopts fhq opt
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do
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case $opt in
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f) opt_force=1 ;;
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q) opt_quiet=1 ;;
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h|?) usage ;;
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esac
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done
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shift $(( $OPTIND - 1 ))
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### ftrace lock
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if [[ -e $flock ]]; then
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if (( opt_force )); then
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warn rm $flock
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else
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echo -e >&2 "ERROR: ftrace lock ($flock) exists. It shows" \
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"ftrace may be in use by PID $(cat $flock).\nDouble check" \
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"to see if that PID is still active. If not, consider" \
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"using -f to force a reset. Exiting."
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exit 1
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fi
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fi
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### reset ftrace state
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vecho "Reseting ftrace state..."
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vecho
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cd $tracing || die "ERROR: accessing tracing. Root user? Kernel has FTRACE?"
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writefile current_tracer nop
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writefile set_ftrace_filter
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writefile set_graph_function
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writefile set_ftrace_pid
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writefile events/enable 0
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writefile tracing_thresh 0
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writefile kprobe_events
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writefile tracing_on 1
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vecho "Done."
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