rcuscale: Print grace-period kthread CPU time, if recorded

This commit prints out the CPU time consumed by the grace-period kthread,
if the specified RCU flavor supports this notion.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
index b582113..f683e42 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuscale.sh
@@ -40,6 +40,10 @@ awk '
        sum += $5 / 1000.;
 }
 
+/rcu_scale: Grace-period kthread CPU time/ {
+       cputime = $6;
+}
+
 END {
        newNR = asort(gptimes);
        if (newNR <= 0) {
@@ -78,6 +82,8 @@ END {
        print "90th percentile grace-period duration: " gptimes[pct90];
        print "99th percentile grace-period duration: " gptimes[pct99];
        print "Maximum grace-period duration: " gptimes[newNR];
-       print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches;
+       if (cputime != "")
+               cpustr = " CPU: " cputime;
+       print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches cpustr;
        print "Computed from rcuscale printk output.";
 }'