| #!/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 |