tools/testing/selftests/cgroup/test_cpuset_v1_hp.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Test the special cpuset v1 hotplug case where a cpuset become empty of
   5 # CPUs will force migration of tasks out to an ancestor.
   6 #
   7
   8 skip_test() {
   9         echo "$1"
  10         echo "Test SKIPPED"
  11         exit 4 # ksft_skip
  12 }
  13
  14 [[ $(id -u) -eq 0 ]] || skip_test "Test must be run as root!"
  15
  16 # Find cpuset v1 mount point
  17 CPUSET=$(mount -t cgroup | grep cpuset | head -1 | awk -e '{print $3}')
  18 [[ -n "$CPUSET" ]] || skip_test "cpuset v1 mount point not found!"
  19
  20 #
  21 # Create a test cpuset, put a CPU and a task there and offline that CPU
  22 #
  23 TDIR=test$$
  24 [[ -d $CPUSET/$TDIR ]] || mkdir $CPUSET/$TDIR
  25 echo 1 > $CPUSET/$TDIR/cpuset.cpus
  26 echo 0 > $CPUSET/$TDIR/cpuset.mems
  27 sleep 10&
  28 TASK=$!
  29 echo $TASK > $CPUSET/$TDIR/tasks
  30 NEWCS=$(cat /proc/$TASK/cpuset)
  31 [[ $NEWCS != "/$TDIR" ]] && {
  32         echo "Unexpected cpuset $NEWCS, test FAILED!"
  33         exit 1
  34 }
  35
  36 echo 0 > /sys/devices/system/cpu/cpu1/online
  37 sleep 0.5
  38 echo 1 > /sys/devices/system/cpu/cpu1/online
  39 NEWCS=$(cat /proc/$TASK/cpuset)
  40 rmdir $CPUSET/$TDIR
  41 [[ $NEWCS != "/" ]] && {
  42         echo "cpuset $NEWCS, test FAILED!"
  43         exit 1
  44 }
  45 echo "Test PASSED"
  46 exit 0