tools/perf/tests/shell/stat_bpf_counters.sh

   1 #!/bin/sh
   2 # perf stat --bpf-counters test (exclusive)
   3 # SPDX-License-Identifier: GPL-2.0
   4
   5 set -e
   6
   7 workload="perf test -w sqrtloop"
   8
   9 # check whether $2 is within +/- 20% of $1
  10 compare_number()
  11 {
  12         first_num=$1
  13         second_num=$2
  14
  15         # upper bound is first_num * 120%
  16         upper=$(expr $first_num + $first_num / 5 )
  17         # lower bound is first_num * 80%
  18         lower=$(expr $first_num - $first_num / 5 )
  19
  20         if [ $second_num -gt $upper ] || [ $second_num -lt $lower ]; then
  21                 echo "The difference between $first_num and $second_num are greater than 20%."
  22                 exit 1
  23         fi
  24 }
  25
  26 check_counts()
  27 {
  28         base_instructions=$1
  29         bpf_instructions=$2
  30
  31         if [ "$base_instructions" = "<not" ]; then
  32                 echo "Skipping: instructions event not counted"
  33                 exit 2
  34         fi
  35         if [ "$bpf_instructions" = "<not" ]; then
  36                 echo "Failed: instructions not counted with --bpf-counters"
  37                 exit 1
  38         fi
  39 }
  40
  41 test_bpf_counters()
  42 {
  43         printf "Testing --bpf-counters "
  44         base_instructions=$(perf stat --no-big-num -e instructions -- $workload 2>&1 | awk '/instructions/ {print $1}')
  45         bpf_instructions=$(perf stat --no-big-num --bpf-counters -e instructions -- $workload  2>&1 | awk '/instructions/ {print $1}')
  46         check_counts $base_instructions $bpf_instructions
  47         compare_number $base_instructions $bpf_instructions
  48         echo "[Success]"
  49 }
  50
  51 test_bpf_modifier()
  52 {
  53         printf "Testing bpf event modifier "
  54         stat_output=$(perf stat --no-big-num -e instructions/name=base_instructions/,instructions/name=bpf_instructions/b -- $workload 2>&1)
  55         base_instructions=$(echo "$stat_output"| awk '/base_instructions/ {print $1}')
  56         bpf_instructions=$(echo "$stat_output"| awk '/bpf_instructions/ {print $1}')
  57         check_counts $base_instructions $bpf_instructions
  58         compare_number $base_instructions $bpf_instructions
  59         echo "[Success]"
  60 }
  61
  62 # skip if --bpf-counters is not supported
  63 if ! perf stat -e instructions --bpf-counters true > /dev/null 2>&1; then
  64         if [ "$1" = "-v" ]; then
  65                 echo "Skipping: --bpf-counters not supported"
  66                 perf --no-pager stat -e instructions --bpf-counters true || true
  67         fi
  68         exit 2
  69 fi
  70
  71 test_bpf_counters
  72 test_bpf_modifier
  73
  74 exit 0