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| author |   Joel Fernandes (Google) <joel@joelfernandes.org> | 2019-03-26 15:24:10 -0400 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@linux.ibm.com> | 2019-05-28 09:06:09 -0700 |
| commit | e0e2147c1a6a722f6b2e359c5132a825ecb8a420 (patch) | |
| tree | 6a5f5be7e24801c987f006ba7c1b7bd11ac191c2 /tools/testing/selftests/rcutorture/bin/jitter.sh | |
| parent | Linux 5.2-rc1 (diff) | |
| download | linux-dev-e0e2147c1a6a722f6b2e359c5132a825ecb8a420.tar.xz linux-dev-e0e2147c1a6a722f6b2e359c5132a825ecb8a420.zip | |
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>
Diffstat (limited to '')
| -rwxr-xr-x | tools/testing/selftests/rcutorture/bin/jitter.sh | 5 |
1 files 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); |