[v2,3/4] rcutorture: Select from only online CPUs
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Message ID 20190326192411.198070-3-joel@joelfernandes.org
State Mainlined
Commit e0e2147c1a6a722f6b2e359c5132a825ecb8a420
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Series
  • [v2,1/4] lockdep: Add assertion to check if in an interrupt
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Commit Message

Joel Fernandes March 26, 2019, 7:24 p.m. UTC
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>
---
 tools/testing/selftests/rcutorture/bin/jitter.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch
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diff --git a/tools/testing/selftests/rcutorture/bin/jitter.sh b/tools/testing/selftests/rcutorture/bin/jitter.sh
index 3633828375e3..47bd9829dc55 100755
--- a/tools/testing/selftests/rcutorture/bin/jitter.sh
+++ b/tools/testing/selftests/rcutorture/bin/jitter.sh
@@ -47,10 +47,11 @@  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);