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torture: Make --cpus override idleness calculations

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Currently, rcutorture will use relatively few CPUs to build the kernel
on a busy system, which is often as it should be.  However, if the user
has used the --cpus argument to dedicate a specified number of CPUs to
this torture test, it would be good if the kernel build also made use
of them.  This commit therefore changes the cpus2use.sh script to use
--cpus when specified and to do the idleness calculations otherwise.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-05-11 17:59:52 -07:00
parent 6dc82595ef
commit 7225c07772
2 changed files with 8 additions and 0 deletions
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5
tools/testing/selftests/rcutorture/bin/cpus2use.sh
View File

@ -9,6 +9,11 @@
#
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
if test -n "$TORTURE_ALLOTED_CPUS"
then
echo $TORTURE_ALLOTED_CPUS
exit 0
fi
ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
idlecpus=`mpstat | tail -1 | \
awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`

3
tools/testing/selftests/rcutorture/bin/kvm.sh
View File

@ -24,6 +24,7 @@ dur=$((30*60))
dryrun=""
KVM="`pwd`/tools/testing/selftests/rcutorture"; export KVM
PATH=${KVM}/bin:$PATH; export PATH
TORTURE_ALLOTED_CPUS=""
TORTURE_DEFCONFIG=defconfig
TORTURE_BOOT_IMAGE=""
TORTURE_INITRD="$KVM/initrd"; export TORTURE_INITRD
@ -89,6 +90,7 @@ do
--cpus)
checkarg --cpus "(number)" "$#" "$2" '^[0-9]*$' '^--'
cpus=$2
TORTURE_ALLOTED_CPUS="$2"
shift
;;
--datestamp)
@ -285,6 +287,7 @@ cat << ___EOF___ > $T/script
CONFIGFRAG="$CONFIGFRAG"; export CONFIGFRAG
KVM="$KVM"; export KVM
PATH="$PATH"; export PATH
TORTURE_ALLOTED_CPUS="$TORTURE_ALLOTED_CPUS"; export TORTURE_ALLOTED_CPUS
TORTURE_BOOT_IMAGE="$TORTURE_BOOT_IMAGE"; export TORTURE_BOOT_IMAGE
TORTURE_BUILDONLY="$TORTURE_BUILDONLY"; export TORTURE_BUILDONLY
TORTURE_DEFCONFIG="$TORTURE_DEFCONFIG"; export TORTURE_DEFCONFIG