Quelle  with_stress.sh   Sprache: Shell

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4

stress_fork()
{
 while true ; do
  /usr/bin/true
  sleep 0.01
 done
}

stress_subsys()
{
 local verb=+
 while true ; do
  echo $verb$subsys_ctrl >$sysfs/cgroup.subtree_control
  [ $verb = "+" ] && verb=- || verb=+
  # incommensurable period with other stresses
  sleep 0.011
 done
}

init_and_check()
{
 sysfs=`mount -t cgroup2 | head -1 | awk '{ print $3 }'`
 if [ ! -d "$sysfs" ]; then
  echo "Skipping: cgroup2 is not mounted" >&2
  exit $ksft_skip
 fi

 if ! echo +$subsys_ctrl >$sysfs/cgroup.subtree_control ; then
  echo "Skipping: cannot enable $subsys_ctrl in $sysfs" >&2
  exit $ksft_skip
 fi

 if ! echo -$subsys_ctrl >$sysfs/cgroup.subtree_control ; then
  echo "Skipping: cannot disable $subsys_ctrl in $sysfs" >&2
  exit $ksft_skip
 fi
}

declare -a stresses
declare -a stress_pids
duration=5
rc=0
subsys_ctrl=cpuset
sysfs=

while getopts c:d:hs: opt; do
 case $opt in
 c)
  subsys_ctrl=$OPTARG
  ;;
 d)
  duration=$OPTARG
  ;;
 h)
  echo "Usage $0 [ -s stress ] ... [ -d duration ] [-c controller] cmd args .."
  echo -e "\t default duration $duration seconds"
  echo -e "\t default controller $subsys_ctrl"
  exit
  ;;
 s)
  func=stress_$OPTARG
  if [ "x$(type -t $func)" != "xfunction" ] ; then
   echo "Unknown stress $OPTARG"
   exit 1
  fi
  stresses+=($func)
  ;;
 esac
done
shift $((OPTIND - 1))

init_and_check

for s in ${stresses[*]} ; do
 $s &
 stress_pids+=($!)
done


time=0
start=$(date +%s)

while [ $time -lt $duration ] ; do
 $*
 rc=$?
 [ $rc -eq 0 ] || break
 time=$(($(date +%s) - $start))
done

for pid in ${stress_pids[*]} ; do
 kill -SIGTERM $pid
 wait $pid
done

exit $rc