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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event filter function - test event filtering on functions
# requires: set_event events/kmem/kmem_cache_free/filter
# flags: instance
fail() { #msg
echo $1
exit_fail
}
sample_events() {
echo > trace
echo 1 > events/kmem/kmem_cache_free/enable
echo 1 > tracing_on
ls > /dev/null
echo 0 > tracing_on
echo 0 > events/kmem/kmem_cache_free/enable
}
echo 0 > tracing_on
echo 0 > events/enable
echo "Get the most frequently calling function"
sample_events
target_func=`cut -d: -f3 trace | sed 's/call_site=\([^+]*\)+0x.*/\1/' | sort | uniq -c | sort | tail -n 1 | sed 's/^[ 0-9]*//'`
if [ -z "$target_func" ]; then
exit_fail
fi
echo > trace
echo "Test event filter function name"
echo "call_site.function == $target_func" > events/kmem/kmem_cache_free/filter
sample_events
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
if [ $hitcnt -eq 0 ]; then
exit_fail
fi
if [ $misscnt -gt 0 ]; then
exit_fail
fi
address=`grep " ${target_func}\$" /proc/kallsyms | cut -d' ' -f1`
echo "Test event filter function address"
echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter
sample_events
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
if [ $hitcnt -eq 0 ]; then
exit_fail
fi
if [ $misscnt -gt 0 ]; then
exit_fail
fi
reset_events_filter
exit 0
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