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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later
# description: ftrace - function trace across cpu hotplug
# requires: function:tracer
if ! which nproc ; then
nproc() {
ls -d /sys/devices/system/cpu/cpu[0-9]* | wc -l
}
fi
NP=`nproc`
if [ $NP -eq 1 ] ;then
echo "We cannot test cpu hotplug in UP environment"
exit_unresolved
fi
# Find online cpu
for i in /sys/devices/system/cpu/cpu[1-9]*; do
if [ -f $i/online ] && [ "$(cat $i/online)" = "1" ]; then
cpu=$i
break
fi
done
if [ -z "$cpu" ]; then
echo "We cannot test cpu hotplug with a single cpu online"
exit_unresolved
fi
echo 0 > tracing_on
echo > trace
: "Set $(basename $cpu) offline/online with function tracer enabled"
echo function > current_tracer
echo 1 > tracing_on
(echo 0 > $cpu/online)
(echo "forked"; sleep 1)
(echo 1 > $cpu/online)
echo 0 > tracing_on
echo nop > current_tracer
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