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selftests/cgroup: Add test for preserving boot-isolated CPUs

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Put a CPU isolated at boot into an isolated partition, change the
partition back to member and check that the CPU remains isolated.

Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Guopeng Zhang 2026-08-24 10:01:40 +08:00 committed by Tejun Heo
parent 6c37d7e074
commit 87d347a8c8
1 changed files with 58 additions and 0 deletions
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58
tools/testing/selftests/cgroup/test_cpuset_prs.sh
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@ -1155,6 +1155,63 @@ test_isolated()
pause 0.05
}
#
# Select an online CPU isolated from scheduler domains at boot.
# $1: test name used in the skip message
#
get_boot_isolated_cpu()
{
TEST_NAME=$1
BOOT_ISOLATED_FILE=/sys/devices/system/cpu/isolated
[[ -r $BOOT_ISOLATED_FILE ]] || {
echo "$TEST_NAME test SKIPPED: boot isolation state unavailable"
return 1
}
BOOT_CPUS=$(cat $BOOT_ISOLATED_FILE)
[[ -n "$BOOT_CPUS" ]] || {
echo "$TEST_NAME test SKIPPED: no boot-isolated CPU"
return 1
}
BOOT_CPU=$(echo "$BOOT_CPUS" | sed -e 's/[,-].*//')
CPU_ONLINE=/sys/devices/system/cpu/cpu${BOOT_CPU}/online
[[ ! -e $CPU_ONLINE || $(cat $CPU_ONLINE) -eq 1 ]] || {
echo "$TEST_NAME test SKIPPED: CPU $BOOT_CPU is offline"
return 1
}
}
#
# A CPU isolated at boot must stay isolated after it is released by a dynamic
# isolated partition.
#
test_boot_isolated()
{
TEST_NAME="Boot-isolated CPU partition release"
get_boot_isolated_cpu "$TEST_NAME" || return 0
echo "Running $TEST_NAME test ..."
cd $CGROUP2/test
echo member > cpuset.cpus.partition
echo $BOOT_CPU > cpuset.cpus
[[ $(cat cpuset.cpus.effective) = "$BOOT_CPU" ]] || {
echo "$TEST_NAME test SKIPPED: CPU $BOOT_CPU is unavailable"
echo "" > cpuset.cpus
cd $CGROUP2
return 0
}
test_partition isolated
test_partition member
check_isolcpus "." || {
echo "Boot-isolated CPU $BOOT_CPU was lost after partition release"
exit 1
}
echo "" > cpuset.cpus
cd $CGROUP2
echo "$TEST_NAME test PASSED."
}
#
# Wait for inotify event for the given file and read it
# $1: cgroup file to wait for
@ -1226,5 +1283,6 @@ trap cleanup 0 2 3 6
run_state_test TEST_MATRIX
run_remote_state_test REMOTE_TEST_MATRIX
test_isolated
test_boot_isolated
test_inotify
echo "All tests PASSED."