rcutorture: Add dryrun capability

Actual rcutorture tests take considerable time and machine resources,
so it is inconvenient to actually do an rcutorture run when optimizing
the bin-packing algorithm.  This commit therefore adds a --dryrun
argument, which defaults to doing a run, but for which "sched"
says to simply print the run schedule and "script" dumps the script
without running it.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index f74f00628afed5d1816df428cd80f60442429bbd..9fab7c8e76f0f7a9ebe5ad29f21480b19d1c0ee1 100644 (file)
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -35,6 +35,7 @@ trap 'rm -rf $T' 0
 mkdir $T
 
 dur=30
+dryrun=""
 KVM="`pwd`/tools/testing/selftests/rcutorture"; export KVM
 PATH=${KVM}/bin:$PATH; export PATH
 builddir="${KVM}/b1"
@@ -56,6 +57,7 @@ usage () {
        echo "       --configs \"config-file list\""
        echo "       --cpus N"
        echo "       --datestamp string"
+       echo "       --dryrun sched|script"
        echo "       --duration minutes"
        echo "       --interactive"
        echo "       --kmake-arg kernel-make-arguments"
@@ -101,6 +103,11 @@ do
                ds=$2
                shift
                ;;
+       --dryrun)
+               checkarg --dryrun "sched|script" $# "$2" 'sched\|script' '^--'
+               dryrun=$2
+               shift
+               ;;
        --duration)
                checkarg --duration "(minutes)" $# "$2" '^[0-9]*$' '^error'
                dur=$2
@@ -179,9 +186,12 @@ else
        fi
 fi
 mkdir $resdir/$ds
-echo Results directory: $resdir/$ds
+if test "$dryrun" = ""
+then
+       echo Results directory: $resdir/$ds
+       echo $scriptname $args
+fi
 touch $resdir/$ds/log
-echo $scriptname $args
 echo $scriptname $args >> $resdir/$ds/log
 
 pwd > $resdir/$ds/testid.txt
@@ -231,7 +241,7 @@ function dump(first, pastlast)
                print "echo ", cf[j], cpus[j] ": Starting build."
                print "rm -f " builddir ".*"
                print "touch " builddir ".wait"
-               print "mkdir " builddir " || :"
+               print "mkdir " builddir " > /dev/null 2>&1 || :"
                if (cfrep[cf[j]] == "") {
                        cfr[j] = cf[j];
                        cfrep[cf[j]] = 1;
@@ -286,7 +296,28 @@ END {
                dump(first, i);
 }' > $T/script
 
-sh $T/script
+if test "$dryrun" = script
+then
+       echo CONFIGFRAG="$CONFIGFRAG; export CONFIGFRAG"
+       echo KVM="$KVM; export KVM"
+       echo KVPATH="$KVPATH; export KVPATH"
+       echo PATH="$PATH; export PATH"
+       echo RCU_BUILDONLY="$RCU_BUILDONLY; export RCU_BUILDONLY"
+       echo RCU_INITRD="$RCU_INITRD; export RCU_INITRD"
+       echo RCU_KMAKE_ARG="$RCU_KMAKE_ARG; export RCU_KMAKE_ARG"
+       echo RCU_QEMU_CMD="$RCU_QEMU_CMD; export RCU_QEMU_CMD"
+       echo RCU_QEMU_INTERACTIVE="$RCU_QEMU_INTERACTIVE; export RCU_QEMU_INTERACTIVE"
+       echo RCU_QEMU_MAC="$RCU_QEMU_MAC; export RCU_QEMU_MAC"
+       cat $T/script
+       exit 0
+elif test "$dryrun" = sched
+then
+       egrep 'start batch|Starting build\.' $T/script |
+               sed -e 's/:.*$//' -e 's/^echo //'
+       exit 0
+else
+       sh $T/script
+fi
 
 # Tracing: trace_event=rcu:rcu_grace_period,rcu:rcu_future_grace_period,rcu:rcu_grace_period_init,rcu:rcu_nocb_wake,rcu:rcu_preempt_task,rcu:rcu_unlock_preempted_task,rcu:rcu_quiescent_state_report,rcu:rcu_fqs,rcu:rcu_callback,rcu:rcu_kfree_callback,rcu:rcu_batch_start,rcu:rcu_invoke_callback,rcu:rcu_invoke_kfree_callback,rcu:rcu_batch_end,rcu:rcu_torture_read,rcu:rcu_barrier