1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0+
3#
4# Analyze a given results directory for rcuscale scalability measurements.
5#
6# Usage: kvm-recheck-rcuscale.sh resdir
7#
8# Copyright (C) IBM Corporation, 2016
9#
10# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
11
12i="$1"
13if test -d "$i" -a -r "$i"
14then
15	:
16else
17	echo Unreadable results directory: $i
18	exit 1
19fi
20PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH
21. functions.sh
22
23if kvm-recheck-rcuscale-ftrace.sh $i
24then
25	# ftrace data was successfully analyzed, call it good!
26	exit 0
27fi
28
29configfile=`echo $i | sed -e 's/^.*\///'`
30
31sed -e 's/^\[[^]]*]//' < $i/console.log |
32awk '
33/-scale: .* gps: .* batches:/ {
34	ngps = $9;
35	nbatches = 1;
36}
37
38/-scale: .*writer-duration/ {
39	gptimes[++n] = $5 / 1000.;
40	sum += $5 / 1000.;
41}
42
43/rcu_scale: Grace-period kthread CPU time/ {
44	cputime = $6;
45}
46
47END {
48	newNR = asort(gptimes);
49	if (newNR <= 0) {
50		print "No rcuscale records found???"
51		exit;
52	}
53	pct50 = int(newNR * 50 / 100);
54	if (pct50 < 1)
55		pct50 = 1;
56	pct90 = int(newNR * 90 / 100);
57	if (pct90 < 1)
58		pct90 = 1;
59	pct99 = int(newNR * 99 / 100);
60	if (pct99 < 1)
61		pct99 = 1;
62	div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
63	print "Histogram bucket size: " div;
64	last = gptimes[1] - 10;
65	count = 0;
66	for (i = 1; i <= newNR; i++) {
67		current = div * int(gptimes[i] / div);
68		if (last == current) {
69			count++;
70		} else {
71			if (count > 0)
72				print last, count;
73			count = 1;
74			last = current;
75		}
76	}
77	if (count > 0)
78		print last, count;
79	print "Average grace-period duration: " sum / newNR " microseconds";
80	print "Minimum grace-period duration: " gptimes[1];
81	print "50th percentile grace-period duration: " gptimes[pct50];
82	print "90th percentile grace-period duration: " gptimes[pct90];
83	print "99th percentile grace-period duration: " gptimes[pct99];
84	print "Maximum grace-period duration: " gptimes[newNR];
85	if (cputime != "")
86		cpustr = " CPU: " cputime;
87	print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches cpustr;
88	print "Computed from rcuscale printk output.";
89}'
90