From: Joel Fernandes (Google) Date: Tue, 26 Mar 2019 19:24:10 +0000 (-0400) Subject: rcutorture: Select from only online CPUs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e0e2147c1a6a722f6b2e359c5132a825ecb8a420;p=linux.git 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) Signed-off-by: Paul E. McKenney --- diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh index 435b609339854..81c6e6ab5d830 100755 --- a/tools/testing/selftests/rcutorture/bin/jitter.sh +++ b/tools/testing/selftests/rcutorture/bin/jitter.sh @@ -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);