[LTP] [RFC] cpu_hotplug: Adding a cpu hotplug stress test

preeti
2012-07-17T10:49:37Z

Hi

The test case included is a simple case for cpu hotplug.It does offlines the cpus that are online and does an online of the offlined cpus in a loop

This stress test had failed on certain distros when the loop was run infinite times.This test is presented here for review of correctness and necessity,as this is the first attempt at contributing test cases to LTP from this end.

The test is meant to be included under the testcases/kernel/hotplug/cpu_hotplug/functional directory.

Regards
Preeti
---

# File : stress_cpu_hotplug.sh
# Description : Switches the online state of all the cpus in a
# loop to test the robustness of cpu hotplug
# : The loop iteration of 20 is a randomly chosen number

#! /bin/bash

# Includes:
LHCS_PATH=${LHCS_PATH:-$LTPROOT/testcases/bin/cpu_hotplug}
. $LHCS_PATH/include/hotplug.fns
. $LHCS_PATH/include/testsuite.fns

setup()
{
export TST_TOTAL=1
export TCID="setup"
export TST_COUNT=0

trap "cleanup" 0
RC=0

return $RC

}
cleanup()
{
set_all_cpu_state "$STATE"
}

test01()
{

TCID="stress_cpu_hotplug"
TST_COUNT=1
RC=0

NUMBER_OF_CPUS=`ls -d /sys/devices/system/cpu/cpu[0-9]* | wc -l`

cd /sys/devices/system/cpu

for ARRAY_INDEX in `seq 20`
do
for ((i=1; i < NUMBER_OF_CPUS; i++ ))
do
#skip the boot cpu;cannot offline it
if [ $i -eq 0 ]
then
continue
fi

state=`cat cpu$i/online`
if [ $state -eq 0 ]
then
RC=online_cpu $i
else
RC=offline_cpu $i
fi

if [ $RC -ne 0 ]
then
test_brkm TBROK NULL "stress_cpu_hotplug:
cpu$i failed to hotplug"
return $RC
fi
done

if [ `expr $ARRAY_INDEX % 10` == 0 ]
then
echo "stress test successfully completed
"$ARRAY_INDEX" times">$LTPTMP/test_file.out
fi
done
test_res TPASS $LTPTMP/test_file.out "stress_cpu_hotplug:SUCCESS"
return $RC
}

#main

RC=0
LTPTMP=${TMP}

#create output file to dump test results
touch $LTPTMP/test_file.out || RC=$?

if [ $RC -ne 0 ]
then
test_resm TFAIL "Failed to create output file under temp directory"
exit $RC
fi

if ! get_all_cpus >/dev/null 2>$RC;
then
tst_brkm TCONF "system does not have required cpu hotplug support"
exit $RC
fi

setup || exit $RC

#capture the initial state of the cpus
state=`cd /sys/devices/system/cpu/ && grep '' */online | sed -e
's/\/online//g' -e 's/\ /\n/g'`

test01 || exit $RC