torture: Handle jitter for CPUs that cannot be offlined (517f17ae) · Commits · 戴 / test

Currently, jitter.sh assumes that the underlying hypervisor will be configured with all CPUs hotpluggable, with the possible exception of CPU 0. However, there are installations where the hypervisor prohibits offlining, which breaks jitter.sh. This commit therefore lists the CPUs that cannot be offlined up front, and checks for the case where no CPU can be offlined in the loop. Signed-off-by:

Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/bin/jitter.sh

+20 −6

Original line number	Diff line number	Diff line
		@@ -25,6 +25,18 @@ n=1

		starttime=`gawk 'BEGIN { print systime(); }' < /dev/null`

		nohotplugcpus=
		for i in /sys/devices/system/cpu/cpu[0-9]*
		do
		if test -f $i/online
		then
		:
		else
		curcpu=`echo $i \| sed -e 's/^[^0-9]*//'`
		nohotplugcpus="$nohotplugcpus $curcpu"
		fi
		done

		while :
		do
		# Check for done.
		@@ -35,13 +47,15 @@ do
		fi

		# Set affinity to randomly selected online CPU
		cpus=`grep 1 /sys/devices/system/cpu/*/online \|
		if cpus=`grep 1 /sys/devices/system/cpu/*/online 2>&1 \|
		sed -e 's,/[^/]$,,' -e 's/^[^0-9]//'`

		# Do not leave out poor old cpu0 which may not be hot-pluggable
		if [ ! -f "/sys/devices/system/cpu/cpu0/online" ]; then
		cpus="0 $cpus"
		then
		:
		else
		cpus=
		fi
		# Do not leave out non-hot-pluggable CPUs
		cpus="$cpus $nohotplugcpus"

		cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN {
		srand(n + me + systime());

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