110 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.0+3#4# Analyze a given results directory for rcuscale performance measurements,5# looking for ftrace data. Exits with 0 if data was found, analyzed, and6# printed. Intended to be invoked from kvm-recheck-rcuscale.sh after7# argument checking.8#9# Usage: kvm-recheck-rcuscale-ftrace.sh resdir10#11# Copyright (C) IBM Corporation, 201612#13# Authors: Paul E. McKenney <paulmck@linux.ibm.com>14 15i="$1"16. functions.sh17 18if test "`grep -c 'rcu_exp_grace_period.*start' < $i/console.log`" -lt 10019then20 exit 1021fi22 23sed -e 's/^\[[^]]*]//' < $i/console.log |24grep 'us : rcu_exp_grace_period' |25sed -e 's/us : / : /' |26tr -d '\015' |27awk '28$8 == "start" {29 if (startseq != "")30 nlost++;31 starttask = $1;32 starttime = $3;33 startseq = $7;34 seqtask[startseq] = starttask;35}36 37$8 == "end" {38 if (startseq == $7) {39 curgpdur = $3 - starttime;40 gptimes[++n] = curgpdur;41 gptaskcnt[starttask]++;42 sum += curgpdur;43 if (curgpdur > 1000)44 print "Long GP " starttime "us to " $3 "us (" curgpdur "us)";45 startseq = "";46 } else {47 # Lost a message or some such, reset.48 startseq = "";49 nlost++;50 }51}52 53$8 == "done" && seqtask[$7] != $1 {54 piggybackcnt[$1]++;55}56 57END {58 newNR = asort(gptimes);59 if (newNR <= 0) {60 print "No ftrace records found???"61 exit 10;62 }63 pct50 = int(newNR * 50 / 100);64 if (pct50 < 1)65 pct50 = 1;66 pct90 = int(newNR * 90 / 100);67 if (pct90 < 1)68 pct90 = 1;69 pct99 = int(newNR * 99 / 100);70 if (pct99 < 1)71 pct99 = 1;72 div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;73 print "Histogram bucket size: " div;74 last = gptimes[1] - 10;75 count = 0;76 for (i = 1; i <= newNR; i++) {77 current = div * int(gptimes[i] / div);78 if (last == current) {79 count++;80 } else {81 if (count > 0)82 print last, count;83 count = 1;84 last = current;85 }86 }87 if (count > 0)88 print last, count;89 print "Distribution of grace periods across tasks:";90 for (i in gptaskcnt) {91 print "\t" i, gptaskcnt[i];92 nbatches += gptaskcnt[i];93 }94 ngps = nbatches;95 print "Distribution of piggybacking across tasks:";96 for (i in piggybackcnt) {97 print "\t" i, piggybackcnt[i];98 ngps += piggybackcnt[i];99 }100 print "Average grace-period duration: " sum / newNR " microseconds";101 print "Minimum grace-period duration: " gptimes[1];102 print "50th percentile grace-period duration: " gptimes[pct50];103 print "90th percentile grace-period duration: " gptimes[pct90];104 print "99th percentile grace-period duration: " gptimes[pct99];105 print "Maximum grace-period duration: " gptimes[newNR];106 print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches " Lost: " nlost + 0;107 print "Computed from ftrace data.";108}'109exit 0110