47 lines
1.1 KiB
Bash
47 lines
1.1 KiB
Bash
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Test the special cpuset v1 hotplug case where a cpuset become empty of
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# CPUs will force migration of tasks out to an ancestor.
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#
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skip_test() {
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echo "$1"
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echo "Test SKIPPED"
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exit 4 # ksft_skip
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}
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[[ $(id -u) -eq 0 ]] || skip_test "Test must be run as root!"
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# Find cpuset v1 mount point
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CPUSET=$(mount -t cgroup | grep cpuset | head -1 | awk -e '{print $3}')
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[[ -n "$CPUSET" ]] || skip_test "cpuset v1 mount point not found!"
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#
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# Create a test cpuset, put a CPU and a task there and offline that CPU
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#
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TDIR=test$$
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[[ -d $CPUSET/$TDIR ]] || mkdir $CPUSET/$TDIR
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echo 1 > $CPUSET/$TDIR/cpuset.cpus
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echo 0 > $CPUSET/$TDIR/cpuset.mems
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sleep 10&
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TASK=$!
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echo $TASK > $CPUSET/$TDIR/tasks
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NEWCS=$(cat /proc/$TASK/cpuset)
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[[ $NEWCS != "/$TDIR" ]] && {
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echo "Unexpected cpuset $NEWCS, test FAILED!"
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exit 1
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}
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echo 0 > /sys/devices/system/cpu/cpu1/online
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sleep 0.5
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echo 1 > /sys/devices/system/cpu/cpu1/online
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NEWCS=$(cat /proc/$TASK/cpuset)
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rmdir $CPUSET/$TDIR
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[[ $NEWCS != "/" ]] && {
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echo "cpuset $NEWCS, test FAILED!"
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exit 1
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}
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echo "Test PASSED"
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exit 0
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