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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Analyze a given results directory for rcuscale performance measurements,
# looking for ftrace data. Exits with 0 if data was found, analyzed, and
# printed. Intended to be invoked from kvm-recheck-rcuscale.sh after
# argument checking.
#
# Usage: kvm-recheck-rcuscale-ftrace.sh resdir
#
# Copyright (C) IBM Corporation, 2016
#
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>
i="$1"
. functions.sh
if test "`grep -c 'rcu_exp_grace_period.*start' < $i/console.log`" -lt 100
then
exit 10
fi
sed -e 's/^\[[^]]*]//' < $i/console.log |
grep 'us : rcu_exp_grace_period' |
sed -e 's/us : / : /' |
tr -d '\015' |
awk '
$8 == "start" {
if (startseq != "")
nlost++;
starttask = $1;
starttime = $3;
startseq = $7;
seqtask[startseq] = starttask;
}
$8 == "end" {
if (startseq == $7) {
curgpdur = $3 - starttime;
gptimes[++n] = curgpdur;
gptaskcnt[starttask]++;
sum += curgpdur;
if (curgpdur > 1000)
print "Long GP " starttime "us to " $3 "us (" curgpdur "us)";
startseq = "";
} else {
# Lost a message or some such, reset.
startseq = "";
nlost++;
}
}
$8 == "done" && seqtask[$7] != $1 {
piggybackcnt[$1]++;
}
END {
newNR = asort(gptimes);
if (newNR <= 0) {
print "No ftrace records found???"
exit 10;
}
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 "Distribution of grace periods across tasks:";
for (i in gptaskcnt) {
print "\t" i, gptaskcnt[i];
nbatches += gptaskcnt[i];
}
ngps = nbatches;
print "Distribution of piggybacking across tasks:";
for (i in piggybackcnt) {
print "\t" i, piggybackcnt[i];
ngps += piggybackcnt[i];
}
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];
print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches " Lost: " nlost + 0;
print "Computed from ftrace data.";
}'
exit 0
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