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812c5945bd
Add a simple test to verify that an empty v1 cpuset will force its tasks
to be moved to an ancestor node. It is based on the test case documented
in commit 76bb5ab8f6 ("cpuset: break kernfs active protection in
cpuset_write_resmask()").
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
47 lines
1.1 KiB
Bash
Executable File
47 lines
1.1 KiB
Bash
Executable File
#!/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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