[tip: core/rcu] torture: Make kvm.sh "--dryrun sched" summarize number of batches

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     1f947be7f9696fca36e67f0897bc239b4755ae55
Gitweb:        https://git.kernel.org/tip/1f947be7f9696fca36e67f0897bc239b4755ae55
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Sun, 08 Nov 2020 15:38:26 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 04 Jan 2021 14:01:18 -08:00

torture: Make kvm.sh "--dryrun sched" summarize number of batches

Knowing the number of batches that kvm.sh will split a run into allows
estimation of the duration of a test, give or take the number of builds.
This commit therefore adds a line of output to "--dryrun sched" that
gives the number of batches that will be run.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 tools/testing/selftests/rcutorture/bin/kvm.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index bd07df7..1078be1 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -536,6 +536,8 @@ then
 	egrep 'Start batch|Starting build\.' $T/script |
 		grep -v ">>" |
 		sed -e 's/:.*$//' -e 's/^echo //'
+	nbatches="`grep 'Start batch' $T/script | grep -v ">>" | wc -l`"
+	echo Total number of batches: $nbatches
 	exit 0
 else
 	# Not a dryrun, so run the script.