linux_kernel/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc

#!/bin/sh
# description: event trigger - test histogram modifiers

do_reset() {
    reset_trigger
    echo > set_event
    clear_trace
}

fail() { #msg
    do_reset
    echo $1
    exit $FAIL
}

if [ ! -f set_event -o ! -d events/sched ]; then
    echo "event tracing is not supported"
    exit_unsupported
fi

if [ ! -f events/sched/sched_process_fork/trigger ]; then
    echo "event trigger is not supported"
    exit_unsupported
fi

if [ ! -f events/sched/sched_process_fork/hist ]; then
    echo "hist trigger is not supported"
    exit_unsupported
fi

reset_tracer
do_reset

echo "Test histogram with execname modifier"

echo 'hist:keys=common_pid.execname' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
COMM=`cat /proc/$$/comm`
grep "common_pid: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
    fail "execname modifier on sched_process_fork did not work"

reset_trigger

echo "Test histogram with hex modifier"

echo 'hist:keys=parent_pid.hex' > events/sched/sched_process_fork/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
# Note that $$ is the parent pid. $PID is current PID.
HEX=`printf %x $PID`
grep "parent_pid: $HEX" events/sched/sched_process_fork/hist > /dev/null || \
    fail "hex modifier on sched_process_fork did not work"

reset_trigger

echo "Test histogram with syscall modifier"

echo 'hist:keys=id.syscall' > events/raw_syscalls/sys_exit/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep "id: \(unknown_\|sys_\)" events/raw_syscalls/sys_exit/hist > /dev/null || \
    fail "syscall modifier on raw_syscalls/sys_exit did not work"


reset_trigger

echo "Test histgram with log2 modifier"

echo 'hist:keys=bytes_req.log2' > events/kmem/kmalloc/trigger
for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep 'bytes_req: ~ 2^[0-9]*' events/kmem/kmalloc/hist > /dev/null || \
    fail "log2 modifier on kmem/kmalloc did not work"

do_reset

exit 0