1#!/bin/bash
2#
3# Analyze a given results directory for rcuperf performance measurements.
4#
5# Usage: kvm-recheck-rcuperf.sh resdir
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program; if not, you can access it online at
19# http://www.gnu.org/licenses/gpl-2.0.html.
20#
21# Copyright (C) IBM Corporation, 2016
22#
23# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
24
25i="$1"
26if test -d $i
27then
28	:
29else
30	echo Unreadable results directory: $i
31	exit 1
32fi
33PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH
34. tools/testing/selftests/rcutorture/bin/functions.sh
35
36if kvm-recheck-rcuperf-ftrace.sh $i
37then
38	# ftrace data was successfully analyzed, call it good!
39	exit 0
40fi
41
42configfile=`echo $i | sed -e 's/^.*\///'`
43
44sed -e 's/^\[[^]]*]//' < $i/console.log |
45awk '
46/-perf: .* gps: .* batches:/ {
47	ngps = $9;
48	nbatches = $11;
49}
50
51/-perf: .*writer-duration/ {
52	gptimes[++n] = $5 / 1000.;
53	sum += $5 / 1000.;
54}
55
56END {
57	newNR = asort(gptimes);
58	if (newNR <= 0) {
59		print "No rcuperf records found???"
60		exit;
61	}
62	pct50 = int(newNR * 50 / 100);
63	if (pct50 < 1)
64		pct50 = 1;
65	pct90 = int(newNR * 90 / 100);
66	if (pct90 < 1)
67		pct90 = 1;
68	pct99 = int(newNR * 99 / 100);
69	if (pct99 < 1)
70		pct99 = 1;
71	div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
72	print "Histogram bucket size: " div;
73	last = gptimes[1] - 10;
74	count = 0;
75	for (i = 1; i <= newNR; i++) {
76		current = div * int(gptimes[i] / div);
77		if (last == current) {
78			count++;
79		} else {
80			if (count > 0)
81				print last, count;
82			count = 1;
83			last = current;
84		}
85	}
86	if (count > 0)
87		print last, count;
88	print "Average grace-period duration: " sum / newNR " microseconds";
89	print "Minimum grace-period duration: " gptimes[1];
90	print "50th percentile grace-period duration: " gptimes[pct50];
91	print "90th percentile grace-period duration: " gptimes[pct90];
92	print "99th percentile grace-period duration: " gptimes[pct99];
93	print "Maximum grace-period duration: " gptimes[newNR];
94	print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches;
95	print "Computed from rcuperf printk output.";
96}'
97