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 8skip_test() { 9 echo "$1" 10 echo "Test SKIPPED" 11 exit 4 # ksft_skip 12} 13 14[[ $(id -u) -eq 0 ]] || skip_test "Test must be run as root!" 15 16# Find cpuset v1 mount point 17CPUSET=$(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# 23TDIR=test$$ 24[[ -d $CPUSET/$TDIR ]] || mkdir $CPUSET/$TDIR 25echo 1 > $CPUSET/$TDIR/cpuset.cpus 26echo 0 > $CPUSET/$TDIR/cpuset.mems 27sleep 10& 28TASK=$! 29echo $TASK > $CPUSET/$TDIR/tasks 30NEWCS=$(cat /proc/$TASK/cpuset) 31[[ $NEWCS != "/$TDIR" ]] && { 32 echo "Unexpected cpuset $NEWCS, test FAILED!" 33 exit 1 34} 35 36echo 0 > /sys/devices/system/cpu/cpu1/online 37sleep 0.5 38echo 1 > /sys/devices/system/cpu/cpu1/online 39NEWCS=$(cat /proc/$TASK/cpuset) 40rmdir $CPUSET/$TDIR 41[[ $NEWCS != "/" ]] && { 42 echo "cpuset $NEWCS, test FAILED!" 43 exit 1 44} 45echo "Test PASSED" 46exit 0 47