linux_kernel/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-field-variable-support.tc

#!/bin/sh
# description: event trigger - test field variable support

do_reset() {
    reset_trigger
    echo > set_event
    clear_trace
}

fail() { #msg
    do_reset
    echo $1
    exit_fail
}

if [ ! -f set_event ]; then
    echo "event tracing is not supported"
    exit_unsupported
fi

if [ ! -f synthetic_events ]; then
    echo "synthetic event is not supported"
    exit_unsupported
fi

clear_synthetic_events
reset_tracer
do_reset

echo "Test field variable support"

echo 'wakeup_latency u64 lat; pid_t pid; int prio; char comm[16]' > synthetic_events
echo 'hist:keys=comm:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_waking/trigger
echo 'hist:keys=next_comm:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,next_pid,sched.sched_waking.prio,next_comm) if next_comm=="ping"' > events/sched/sched_switch/trigger
echo 'hist:keys=pid,prio,comm:vals=lat:sort=pid,prio' > events/synthetic/wakeup_latency/trigger

ping localhost -c 3
if ! grep -q "ping" events/synthetic/wakeup_latency/hist; then
    fail "Failed to create inter-event histogram"
fi

if ! grep -q "synthetic_prio=prio" events/sched/sched_waking/hist; then
    fail "Failed to create histogram with field variable"
fi

echo '!hist:keys=next_comm:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,next_pid,sched.sched_waking.prio,next_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger

if grep -q "synthetic_prio=prio" events/sched/sched_waking/hist; then
    fail "Failed to remove histogram with field variable"
fi

do_reset

exit 0