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alistair23-linux/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmax-action-hist.tc

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#!/bin/sh
# description: event trigger - test inter-event histogram trigger onmax action
fail() { #msg
echo $1
exit_fail
}
if [ ! -f set_event ]; then
echo "event tracing is not supported"
exit_unsupported
fi
if [ ! -f synthetic_events ]; then
echo "synthetic event is not supported"
exit_unsupported
fi
echo "Test create synthetic event"
echo 'wakeup_latency u64 lat pid_t pid char comm[16]' > synthetic_events
if [ ! -d events/synthetic/wakeup_latency ]; then
fail "Failed to create wakeup_latency synthetic event"
fi
echo "Test onmax action"
echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_waking/trigger
echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:onmax($wakeup_lat).save(next_comm,prev_pid,prev_prio,prev_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger
ping $LOCALHOST -c 3
if ! grep -q "max:" events/sched/sched_switch/hist; then
fail "Failed to create onmax action inter-event histogram"
fi
exit 0