aboutsummaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/rcutorture/bin/cpus2use.sh
blob: 4e9485590c10d5535a08ebf030518fcecb2e7be9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Get an estimate of how CPU-hoggy to be.
#
# Usage: cpus2use.sh
#
# Copyright (C) IBM Corporation, 2013
#
# Authors: Paul E. McKenney <paulmck@linux.ibm.com>

if test -n "$TORTURE_ALLOTED_CPUS"
then
	echo $TORTURE_ALLOTED_CPUS
	exit 0
fi
ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
idlecpus=`mpstat | tail -1 | \
	awk -v ncpus=$ncpus '{ print ncpus * ($7 + $NF) / 100 }'`
awk -v ncpus=$ncpus -v idlecpus=$idlecpus < /dev/null '
BEGIN {
	cpus2use = idlecpus;
	if (cpus2use < 1)
		cpus2use = 1;
	if (cpus2use < ncpus / 10)
		cpus2use = ncpus / 10;
	if (cpus2use == int(cpus2use))
		cpus2use = int(cpus2use)
	else
		cpus2use = int(cpus2use) + 1
	print cpus2use;
}'