Commit e0e2147c authored Mar 26, 2019 by Joel Fernandes (Google) Committed by Paul E. McKenney May 28, 2019

rcutorture: Select from only online CPUs



The rcutorture jitter.sh script selects a random CPU but does not check
if it is offline or online. This leads to taskset errors many times. On
my machine, hyper threading is disabled so half the cores are offline
causing taskset errors a lot of times. Let us fix this by checking from
only the online CPUs on the system.

Cc: rcu@vger.kernel.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>

parent a188339c

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

+3 −2

Original line number	Diff line number	Diff line
		@@ -34,10 +34,11 @@ do
		exit 0;
		fi

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

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

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