tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: event filter function - test event filtering on functions
   4 # requires: set_event events/kmem/kmem_cache_free/filter
   5 # flags: instance
   6
   7 fail() { #msg
   8     echo $1
   9     exit_fail
  10 }
  11
  12 sample_events() {
  13     echo > trace
  14     echo 1 > events/kmem/kmem_cache_free/enable
  15     echo 1 > tracing_on
  16     ls > /dev/null
  17     echo 0 > tracing_on
  18     echo 0 > events/kmem/kmem_cache_free/enable
  19 }
  20
  21 echo 0 > tracing_on
  22 echo 0 > events/enable
  23
  24 echo "Get the most frequently calling function"
  25 sample_events
  26
  27 target_func=`cut -d: -f3 trace | sed 's/call_site=\([^+]*\)+0x.*/\1/' | sort | uniq -c | sort | tail -n 1 | sed 's/^[ 0-9]*//'`
  28 if [ -z "$target_func" ]; then
  29     exit_fail
  30 fi
  31 echo > trace
  32
  33 echo "Test event filter function name"
  34 echo "call_site.function == $target_func" > events/kmem/kmem_cache_free/filter
  35 sample_events
  36
  37 hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
  38 misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
  39
  40 if [ $hitcnt -eq 0 ]; then
  41         exit_fail
  42 fi
  43
  44 if [ $misscnt -gt 0 ]; then
  45         exit_fail
  46 fi
  47
  48 address=`grep " ${target_func}\$" /proc/kallsyms | cut -d' ' -f1`
  49
  50 echo "Test event filter function address"
  51 echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter
  52 sample_events
  53
  54 hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
  55 misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
  56
  57 if [ $hitcnt -eq 0 ]; then
  58         exit_fail
  59 fi
  60
  61 if [ $misscnt -gt 0 ]; then
  62         exit_fail
  63 fi
  64
  65 reset_events_filter
  66
  67 exit 0