Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[~andy/linux] / tools / testing / selftests / rcutorture / bin / cpus2use.sh

diff --git a/tools/testing/selftests/rcutorture/bin/cpus2use.sh b/tools/testing/selftests/rcutorture/bin/cpus2use.sh
new file mode 100755 (executable)
index 0000000..abe14b7
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/bin/cpus2use.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+#
+# Get an estimate of how CPU-hoggy to be.
+#
+# Usage: cpus2use.sh
+#
+# 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, 2013
+#
+# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+
+ncpus=`grep '^processor' /proc/cpuinfo | wc -l`
+idlecpus=`mpstat | tail -1 | \
+       awk -v ncpus=$ncpus '{ print ncpus * ($7 + $12) / 100 }'`
+awk -v ncpus=$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;
+}'
+