FM / bin

/usr/src/linux-headers-5.15.0-190/tools/testing/selftests/rcutorture/bin/

/usr/src/linux-headers-5.15.0-190/tools/testing/selftests/rcutorture/bin

Name	Size	Mode	Actions
config2csv.sh	1842	0755	edit dl rm
configcheck.sh	986	0755	edit dl rm
configinit.sh	1314	0755	edit dl rm
configNR_CPUS.sh	688	0755	edit dl rm
config_override.sh	814	0755	edit dl rm
console-badness.sh	784	0755	edit dl rm
cpus2use.sh	829	0755	edit dl rm
functions.sh	7538	0644	edit dl rm
jitter.sh	2244	0755	edit dl rm
jitterstart.sh	994	0644	edit dl rm
jitterstop.sh	520	0644	edit dl rm
kcsan-collapse.sh	484	0755	edit dl rm
kvm-again.sh	4025	0755	edit dl rm
kvm-assign-cpus.sh	1999	0755	edit dl rm
kvm-build.sh	1317	0755	edit dl rm
kvm-check-branches.sh	3517	0755	edit dl rm
kvm-end-run-stats.sh	1083	0755	edit dl rm
kvm-find-errors.sh	1624	0755	edit dl rm
kvm-get-cpus-script.sh	2326	0755	edit dl rm
kvm-recheck-lock.sh	884	0755	edit dl rm
kvm-recheck-rcu.sh	2125	0755	edit dl rm
kvm-recheck-rcuscale-ftrace.sh	2680	0755	edit dl rm
kvm-recheck-rcuscale.sh	1959	0755	edit dl rm
kvm-recheck-refscale.sh	1562	0755	edit dl rm
kvm-recheck-scf.sh	930	0755	edit dl rm
kvm-recheck.sh	2694	0755	edit dl rm
kvm-remote-noreap.sh	629	0755	edit dl rm
kvm-remote.sh	7188	0755	edit dl rm
kvm-test-1-run-batch.sh	2630	0755	edit dl rm
kvm-test-1-run-qemu.sh	5393	0755	edit dl rm
kvm-test-1-run.sh	8736	0755	edit dl rm
kvm-transform.sh	2011	0755	edit dl rm
kvm.sh	18936	0755	edit dl rm
mkinitrd.sh	1996	0755	edit dl rm
parse-build.sh	1032	0755	edit dl rm
parse-console.sh	3968	0755	edit dl rm
torture.sh	14775	0755	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/tools/testing/selftests/rcutorture/bin/jitter.sh (2244B)

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Alternate sleeping and spinning on randomly selected CPUs.  The purpose
# of this script is to inflict random OS jitter on a concurrently running
# test.
#
# Usage: jitter.sh me jittering-path duration [ sleepmax [ spinmax ] ]
#
# me: Random-number-generator seed salt.
# duration: Time to run in seconds.
# jittering-path: Path to file whose removal will stop this script.
# sleepmax: Maximum microseconds to sleep, defaults to one second.
# spinmax: Maximum microseconds to spin, defaults to one millisecond.
#
# Copyright (C) IBM Corporation, 2016
#
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>

me=$(($1 * 1000))
jittering=$2
duration=$3
sleepmax=${4-1000000}
spinmax=${5-1000}

n=1

starttime=`gawk 'BEGIN { print systime(); }' < /dev/null`

nohotplugcpus=
for i in /sys/devices/system/cpu/cpu[0-9]*
do
	if test -f $i/online
	then
		:
	else
		curcpu=`echo $i | sed -e 's/^[^0-9]*//'`
		nohotplugcpus="$nohotplugcpus $curcpu"
	fi
done

while :
do
	# Check for done.
	t=`gawk -v s=$starttime 'BEGIN { print systime() - s; }' < /dev/null`
	if test "$t" -gt "$duration"
	then
		exit 0;
	fi

# Check for stop request.
	if ! test -f "$jittering"
	then
		exit 1;
	fi

# Set affinity to randomly selected online CPU
	if cpus=`grep 1 /sys/devices/system/cpu/*/online 2>&1 |
		 sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//'`
	then
		:
	else
		cpus=
	fi
	# Do not leave out non-hot-pluggable CPUs
	cpus="$cpus $nohotplugcpus"

cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN {
		srand(n + me + systime());
		ncpus = split(cpus, ca);
		print ca[int(rand() * ncpus + 1)];
	}' < /dev/null`
	n=$(($n+1))
	if ! taskset -c -p $cpumask $$ > /dev/null 2>&1
	then
		echo taskset failure: '"taskset -c -p ' $cpumask $$ '"'
		exit 1
	fi

# Sleep a random duration
	sleeptime=`awk -v me=$me -v n=$n -v sleepmax=$sleepmax 'BEGIN {
		srand(n + me + systime());
		printf("%06d", int(rand() * sleepmax));
	}' < /dev/null`
	n=$(($n+1))
	sleep .$sleeptime

# Spin a random duration
	limit=`awk -v me=$me -v n=$n -v spinmax=$spinmax 'BEGIN {
		srand(n + me + systime());
		printf("%06d", int(rand() * spinmax));
	}' < /dev/null`
	n=$(($n+1))
	for i in {1..$limit}
	do
		echo > /dev/null
	done
done

exit 1

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