linux/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh
Paul E. McKenney 79619cf515 rcutorture: Issue warnings on close calls due to Reader Batch blows
Normal rcutorture checking overestimates grace periods somewhat due to
the fact that there is a delay from a grace-period request until the
start of the corresponding grace period and another delay from the end
of that grace period to notification of the requestor.  This means that
rcutorture's detection of RCU bugs is less sensitive than it might be.

It turns out that rcutorture also checks the underlying grace-period
"completed" counter (displayed in Reader Batch output), which in theory
allows rcutorture to do exact checks.  In practice, memory misordering
(by both compiler and CPU) can result in false positives.  However,
experience on x86 shows that these false positives are quite rare,
occurring less than one time per 1,000 hours of testing.  This commit
therefore does the exact checking, giving a warning if any Reader Batch
blows happen, and flagging an error if they happen more often than
once every three hours in long tests.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2015-01-10 19:07:46 -08:00

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#!/bin/bash
#
# Analyze a given results directory for rcutorture progress.
#
# Usage: kvm-recheck-rcu.sh resdir
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (C) IBM Corporation, 2014
#
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
i="$1"
if test -d $i
then
:
else
echo Unreadable results directory: $i
exit 1
fi
. tools/testing/selftests/rcutorture/bin/functions.sh
configfile=`echo $i | sed -e 's/^.*\///'`
ngps=`grep ver: $i/console.log 2> /dev/null | tail -1 | sed -e 's/^.* ver: //' -e 's/ .*$//'`
if test -z "$ngps"
then
echo "$configfile -------"
else
title="$configfile ------- $ngps grace periods"
dur=`sed -e 's/^.* rcutorture.shutdown_secs=//' -e 's/ .*$//' < $i/qemu-cmd 2> /dev/null`
if test -z "$dur"
then
:
else
ngpsps=`awk -v ngps=$ngps -v dur=$dur '
BEGIN { print ngps / dur }' < /dev/null`
title="$title ($ngpsps per second)"
fi
echo $title
nclosecalls=`grep --binary-files=text 'torture: Reader Batch' $i/console.log | tail -1 | awk '{for (i=NF-8;i<=NF;i++) sum+=$i; } END {print sum}'`
if test -z "$nclosecalls"
then
exit 0
fi
if test "$nclosecalls" -eq 0
then
exit 0
fi
# Compute number of close calls per tenth of an hour
nclosecalls10=`awk -v nclosecalls=$nclosecalls -v dur=$dur 'BEGIN { print int(nclosecalls * 36000 / dur) }' < /dev/null`
if test $nclosecalls10 -gt 5 -a $nclosecalls -gt 1
then
print_bug $nclosecalls "Reader Batch close calls in" $(($dur/60)) minute run: $i
else
print_warning $nclosecalls "Reader Batch close calls in" $(($dur/60)) minute run: $i
fi
fi