[tip: core/rcu] torture: Use file-based protocol to mark batch's runs complete

[tip-bot2 for Paul E. McKenney]

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

Commit-ID:     b674100e630bf9211d7edce06b5d734b125a74ee
Gitweb:        https://git.kernel.org/tip/b674100e630bf9211d7edce06b5d734b125a74ee
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Wed, 10 Feb 2021 16:28:44 -08:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 08 Mar 2021 14:23:01 -08:00

torture: Use file-based protocol to mark batch's runs complete

Currently, the script generated by kvm.sh does a "wait" to wait on both
the current batch's guest OSes and any jitter.sh scripts.  This works,
but makes it hard to abstract the jittering so that common code can be
used for both local and distributed runs.  This commit therefore uses
"build.run" files in scenario directories, and these files are removed
after the corresponding scenario's guest OS has completed.

Note that --build-only runs do not create build.run files because they
also do not create guest OSes and do not run any jitter.sh scripts.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh |  3 ++-
 tools/testing/selftests/rcutorture/bin/kvm.sh            | 13 +++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
index 91578d3..fed6f10 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
@@ -345,4 +345,7 @@ then
 	echo Unknown PID, cannot kill qemu command
 fi
 
+# Tell the script that this run is done.
+rm -f $resdir/build.run
+
 parse-console.sh $resdir/console.log $title
diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index 7944510..1f5f872 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -469,9 +469,15 @@ function dump(first, pastlast, batchnum)
 		print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date` | tee -a " rd "log";
 		jn++;
 	}
+	print "runfiles="
 	for (j = 1; j < jn; j++) {
 		builddir=rd cfr[j] "/build";
-		print "rm -f " builddir ".ready"
+		if (TORTURE_BUILDONLY)
+			print "rm -f " builddir ".ready"
+		else
+			print "mv " builddir ".ready " builddir ".run"
+			print "runfiles=\"$runfiles " builddir ".run\""
+		fi
 		print "if test -f \"" rd cfr[j] "/builtkernel\""
 		print "then"
 		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date` | tee -a " rd "log";
@@ -501,7 +507,10 @@ function dump(first, pastlast, batchnum)
 		print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&"
 		print "\techo $! >> " rd "jitter_pids"
 	}
-	print "\twait"
+	print "\twhile ls $runfiles > /dev/null 2>&1"
+	print "\tdo"
+	print "\t\t:"
+	print "\tdone"
 	print "\techo ---- All kernel runs complete. `date` | tee -a " rd "log";
 	print "else"
 	print "\twait"