In SMP sever platform, with kernel 2.6.24-rc2 and kernel 2.6.25-rc2,
Set one task affinity to one CPU core, then set offline the CPU core.
After that we can not set online the CPU core again.
1. run the test.sh script: test.sh 1 ( 1 is the logical CPU )
test.sh script:
#!/bin/bash
main(){
typeset -i CPU=$1
./task.sh > /dev/null&
PID=$!
if [ `cat /sys/devices/system/cpu/cpu${CPU}/online` = "0" ]; then
echo "1" > /sys/devices/system/cpu/cpu${CPU}/online
fi
MASK=$((1<<${CPU}))
`taskset -p ${MASK} ${PID} > /dev/null 2>&1`
echo "0" > /sys/devices/system/cpu/cpu${CPU}/online
echo "1" > /sys/devices/system/cpu/cpu${CPU}/online
kill -9 $PID > /dev/null 2>&1
echo "PASS\n"
}
typeset -i TEST_CPU=$1
main $TEST_CPU
2. task.sh script as following
#!/bin/bash
while :
do
NOOP=1
done
Actual Result:
The test.sh will block at set online the CPU ( echo "1" >
/sys/devices/system/cpu/cpu${CPU}/online ).
we check the test.sh has dead by 'ps -aux'.
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