torture: Grace periods do not piggyback off of themselves

The rcuperf trace-event processing counted every "done" trace event
as a piggyback, which is incorrect because the task that started the
grace period didn't piggyback at all.  This commit fixes this problem
by recording the task that started a given grace period and ignoring
that task's "done" record for that grace period.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
index dffb553a7bcc..8948f7926b21 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
@@ -44,6 +44,7 @@ $8 == "start" {
         starttask = $1;
         starttime = $3;
         startseq = $7;
+        seqtask[startseq] = starttask;
 }
 
 $8 == "end" {
@@ -62,7 +63,7 @@ $8 == "end" {
         }
 }
 
-$8 == "done" {
+$8 == "done" && seqtask[$7] != $1 {
         piggybackcnt[$1]++;
 }