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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Analyze a given results directory for rcuscale scalability measurements.
#
# Usage: kvm-recheck-rcuscale.sh resdir
#
# Copyright (C) IBM Corporation, 2016
#
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
i="$1"
if test -d "$i" -a -r "$i"
then
:
else
echo Unreadable results directory: $i
exit 1
fi
PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH
. functions.sh
if kvm-recheck-rcuscale-ftrace.sh $i
then
# ftrace data was successfully analyzed, call it good!
exit 0
fi
configfile=`echo $i | sed -e 's/^.*\///'`
sed -e 's/^\[[^]]*]//' < $i/console.log |
awk '
/-scale: .* gps: .* batches:/ {
ngps = $9;
nbatches = 1;
}
/-scale: .*writer-duration/ {
gptimes[++n] = $5 / 1000.;
sum += $5 / 1000.;
}
/rcu_scale: Grace-period kthread CPU time/ {
cputime = $6;
}
END {
newNR = asort(gptimes);
if (newNR <= 0) {
print "No rcuscale records found???"
exit;
}
pct50 = int(newNR * 50 / 100);
if (pct50 < 1)
pct50 = 1;
pct90 = int(newNR * 90 / 100);
if (pct90 < 1)
pct90 = 1;
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 <= newNR; i++) {
current = div * int(gptimes[i] / div);
if (last == current) {
count++;
} else {
if (count > 0)
print last, count;
count = 1;
last = current;
}
}
if (count > 0)
print last, count;
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[newNR];
if (cputime != "")
cpustr = " CPU: " cputime;
print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches cpustr;
print "Computed from rcuscale printk output.";
}'
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