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tools/virtio/ringtest: fix run-on-all.sh for offline cpus 

commit 21f5eda9b8 upstream.

Since ef1b144d ("tools/virtio/ringtest: fix run-on-all.sh to work
without /dev/cpu") run-on-all.sh uses seq 0 $HOST_AFFINITY as the list
of ids of the CPUs to run the command on (assuming ids of online CPUs
are consecutive and start from 0), where $HOST_AFFINITY is the highest
CPU id in the system previously determined using lscpu.  This can fail
on systems with offline CPUs.

Instead let's use lscpu to determine the list of online CPUs.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Fixes: ef1b144d ("tools/virtio/ringtest: fix run-on-all.sh to work without
/dev/cpu")
Reviewed-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Halil Pasic 2016-08-29 18:25:22 +02:00 committed by Greg Kroah-Hartman
parent fa555d021d
commit 12274f2c17
1 changed files with 3 additions and 2 deletions
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5
tools/virtio/ringtest/run-on-all.sh
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@ -1,12 +1,13 @@
#!/bin/sh
CPUS_ONLINE=$(lscpu --online -p=cpu|grep -v -e '#')
#use last CPU for host. Why not the first?
#many devices tend to use cpu0 by default so
#it tends to be busier
HOST_AFFINITY=$(lscpu -p=cpu | tail -1)
HOST_AFFINITY=$(echo "${CPUS_ONLINE}"|tail -n 1)
#run command on all cpus
for cpu in $(seq 0 $HOST_AFFINITY)
for cpu in $CPUS_ONLINE
do
#Don't run guest and host on same CPU
#It actually works ok if using signalling