selftests/ftrace: Add wakeup tracer testcase

CONFIG_TRACER_SNAPSHOT=y

CONFIG_STACK_TRACER=y

CONFIG_HIST_TRIGGERS=y

CONFIG_SCHED_TRACER=y

CONFIG_PREEMPT_TRACER=y

CONFIG_IRQSOFF_TRACER=y

CONFIG_PREEMPTIRQ_DELAY_TEST=m

#!/bin/sh

# SPDX-License-Identifier: GPL2.0

# description: Test wakeup tracer

if ! which chrt ; then

  echo "chrt is not found. This test requires nice command."

  exit_unresolved

fi

if ! grep -wq "wakeup" available_tracers ; then

  echo "wakeup tracer is not supported"

  exit_unsupported

fi

echo wakeup > current_tracer

echo 1 > tracing_on

echo 0 > tracing_max_latency

: "Wakeup higher priority task"

chrt -f 5 sleep 1

echo 0 > tracing_on

grep '+ \[[[:digit:]]*\]' trace

grep '==> \[[[:digit:]]*\]' trace