Commit-ID: e0e2147c1a6a722f6b2e359c5132a825ecb8a420
Gitweb: https://git.kernel.org/tip/e0e2147c1a6a722f6b2e359c5132a825ecb8a420
Author: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
AuthorDate: Tue, 26 Mar 2019 15:24:10 -0400
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
CommitDate: Tue, 28 May 2019 09:06:09 -0700
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@xxxxxxxxxxxxxxx
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
---
tools/testing/selftests/rcutorture/bin/jitter.sh | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh
index 435b60933985..81c6e6ab5d83 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);
|