clear_trace() { # reset trace output
echo > trace
}
disable_tracing() { # stop trace recording
echo 0 > tracing_on
}
enable_tracing() { # start trace recording
echo 1 > tracing_on
}
reset_tracer() { # reset the current tracer
echo nop > current_tracer
}
reset_trigger_file() {
# remove action triggers first
grep -H ':on[^:]*(' $@ |
while read line; do
cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
file=`echo $line | cut -f1 -d:`
echo "!$cmd" >> $file
done
grep -Hv ^# $@ |
while read line; do
cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
file=`echo $line | cut -f1 -d:`
echo "!$cmd" > $file
done
}
reset_trigger() { # reset all current setting triggers
if [ -d events/synthetic ]; then
reset_trigger_file events/synthetic/*/trigger
fi
reset_trigger_file events/*/*/trigger
}
reset_events_filter() { # reset all current setting filters
grep -v ^none events/*/*/filter |
while read line; do
echo 0 > `echo $line | cut -f1 -d:`
done
}
reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
if [ ! -f set_ftrace_filter ]; then
return 0
fi
echo > set_ftrace_filter
grep -v '^#' set_ftrace_filter | while read t; do
tr=`echo $t | cut -d: -f2`
if [ "$tr" = "" ]; then
continue
fi
if ! grep -q "$t" set_ftrace_filter; then
continue;
fi
name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
tr=`echo $t | cut -d: -f2-4`
limit=`echo $t | cut -d: -f5`
else
tr=`echo $t | cut -d: -f2`
limit=`echo $t | cut -d: -f3`
fi
if [ "$limit" != "unlimited" ]; then
tr="$tr:$limit"
fi
echo "!$name:$tr" > set_ftrace_filter
done
}
disable_events() {
echo 0 > events/enable
}
clear_synthetic_events() { # reset all current synthetic events
grep -v ^# synthetic_events |
while read line; do
echo "!$line" >> synthetic_events
done
}
clear_dynamic_events() { # reset all current dynamic events
again=1
stop=1
# loop mulitple times as some events require other to be removed first
while [ $again -eq 1 ]; do
stop=$((stop+1))
# Prevent infinite loops
if [ $stop -gt 10 ]; then
break;
fi
again=2
grep -v '^#' dynamic_events|
while read line; do
del=`echo $line | sed -e 's/^.\([^ ]*\).*/-\1/'`
if ! echo "$del" >> dynamic_events; then
again=1
fi
done
done
}
initialize_ftrace() { # Reset ftrace to initial-state
# As the initial state, ftrace will be set to nop tracer,
# no events, no triggers, no filters, no function filters,
# no probes, and tracing on.
disable_tracing
reset_tracer
reset_trigger
reset_events_filter
reset_ftrace_filter
disable_events
clear_dynamic_events
[ -f set_event_pid ] && echo > set_event_pid
[ -f set_ftrace_pid ] && echo > set_ftrace_pid
[ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
[ -f set_graph_function ] && echo | tee set_graph_*
[ -f stack_trace_filter ] && echo > stack_trace_filter
[ -f kprobe_events ] && echo > kprobe_events
[ -f uprobe_events ] && echo > uprobe_events
[ -f synthetic_events ] && echo > synthetic_events
[ -f snapshot ] && echo 0 > snapshot
# Stop tracing while reading the trace file by default, to prevent
# the test results while checking it and to avoid taking a long time
# to check the result.
[ -f options/pause-on-trace ] && echo 1 > options/pause-on-trace
clear_trace
enable_tracing
}
finish_ftrace() {
initialize_ftrace
# And recover it to default.
[ -f options/pause-on-trace ] && echo 0 > options/pause-on-trace
}
check_requires() { # Check required files and tracers
for i in "$@" ; do
p=${i%:program}
r=${i%:README}
t=${i%:tracer}
if [ $p != $i ]; then
if ! which $p ; then
echo "Required program $p is not found."
exit_unresolved
fi
elif [ $t != $i ]; then
if ! grep -wq $t available_tracers ; then
echo "Required tracer $t is not configured."
exit_unsupported
fi
elif [ "$r" != "$i" ]; then
if ! grep -Fq "$r" README ; then
echo "Required feature pattern \"$r\" is not in README."
exit_unsupported
fi
elif [ ! -e $i ]; then
echo "Required feature interface $i doesn't exist."
exit_unsupported
fi
done
}
LOCALHOST=127.0.0.1
yield() {
ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
}
# The fork function in the kernel was renamed from "_do_fork" to
# "kernel_fork". As older tests should still work with older kernels
# as well as newer kernels, check which version of fork is used on this
# kernel so that the tests can use the fork function for the running kernel.
FUNCTION_FORK=`(if grep '\bkernel_clone\b' /proc/kallsyms > /dev/null; then
echo kernel_clone; else echo '_do_fork'; fi)`
# Since probe event command may include backslash, explicitly use printf "%s"
# to NOT interpret it.
ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
pos=$(printf "%s" "${2%^*}" | wc -c) # error position
command=$(printf "%s" "$2" | tr -d ^)
echo "Test command: $command"
echo > error_log
(! printf "%s" "$command" >> "$3" ) 2> /dev/null
grep "$1: error:" -A 3 error_log
N=$(tail -n 1 error_log | wc -c)
# " Command: " and "^\n" => 13
test $(expr 13 + $pos) -eq $N
}
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