rcutorture: Print measure of batching efficiency

This commit adds a line giving the number of grace periods, the number
of batches, and the ratio.  The larger the ratio, the greater the
batching efficiency.

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

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
index e5b2817..1f72df8 100755 (executable)
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
@@ -34,33 +34,38 @@ fi
 
 configfile=`echo $i | sed -e 's/^.*\///'`
 
-grep -e '-perf:.*writer-duration' $i/console.log | sed -e 's/^\[[^]]*]//' |
+sed -e 's/^\[[^]]*]//' < $i/console.log |
 awk '
-{
+/-perf: .* gps: .* batches:/ {
+       ngps = $9;
+       nbatches = $11;
+}
+
+/-perf: .*writer-duration/ {
        gptimes[++n] = $5 / 1000.;
        sum += $5 / 1000.;
 }
 
 END {
-       if (NR <= 0) {
+       newNR = asort(gptimes);
+       if (newNR <= 0) {
                print "No rcuperf records found???"
                exit;
        }
-       asort(gptimes);
-       pct50 = int(NR * 50 / 100);
+       pct50 = int(newNR * 50 / 100);
        if (pct50 < 1)
                pct50 = 1;
-       pct90 = int(NR * 90 / 100);
+       pct90 = int(newNR * 90 / 100);
        if (pct90 < 1)
                pct90 = 1;
-       pct99 = int(NR * 99 / 100);
+       pct99 = int(newNR * 99 / 100);
        if (pct99 < 1)
                pct99 = 1;
        div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
        print "Histogram bucket size: " div;
        last = gptimes[1] - 10;
        count = 0;
-       for (i = 1; i <= NR; i++) {
+       for (i = 1; i <= newNR; i++) {
                current = div * int(gptimes[i] / div);
                if (last == current) {
                        count++;
@@ -73,10 +78,11 @@ END {
        }
        if (count > 0)
                print last, count;
-       print "Average grace-period duration: " sum / NR " microseconds";
+       print "Average grace-period duration: " sum / newNR " microseconds";
        print "Minimum grace-period duration: " gptimes[1];
        print "50th percentile grace-period duration: " gptimes[pct50];
        print "90th percentile grace-period duration: " gptimes[pct90];
        print "99th percentile grace-period duration: " gptimes[pct99];
-       print "Maximum grace-period duration: " gptimes[NR];
+       print "Maximum grace-period duration: " gptimes[newNR];
+       print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches;
 }'