Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/sh
2# perf stat --bpf-counters test
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7workload="perf bench sched messaging -g 1 -l 100 -t"
8
9# check whether $2 is within +/- 20% of $1
10compare_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
26check_counts()
27{
28 base_cycles=$1
29 bpf_cycles=$2
30
31 if [ "$base_cycles" = "<not" ]; then
32 echo "Skipping: cycles event not counted"
33 exit 2
34 fi
35 if [ "$bpf_cycles" = "<not" ]; then
36 echo "Failed: cycles not counted with --bpf-counters"
37 exit 1
38 fi
39}
40
41test_bpf_counters()
42{
43 printf "Testing --bpf-counters "
44 base_cycles=$(perf stat --no-big-num -e cycles -- $workload 2>&1 | awk '/cycles/ {print $1}')
45 bpf_cycles=$(perf stat --no-big-num --bpf-counters -e cycles -- $workload 2>&1 | awk '/cycles/ {print $1}')
46 check_counts $base_cycles $bpf_cycles
47 compare_number $base_cycles $bpf_cycles
48 echo "[Success]"
49}
50
51test_bpf_modifier()
52{
53 printf "Testing bpf event modifier "
54 stat_output=$(perf stat --no-big-num -e cycles/name=base_cycles/,cycles/name=bpf_cycles/b -- $workload 2>&1)
55 base_cycles=$(echo "$stat_output"| awk '/base_cycles/ {print $1}')
56 bpf_cycles=$(echo "$stat_output"| awk '/bpf_cycles/ {print $1}')
57 check_counts $base_cycles $bpf_cycles
58 compare_number $base_cycles $bpf_cycles
59 echo "[Success]"
60}
61
62# skip if --bpf-counters is not supported
63if ! perf stat -e cycles --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 cycles --bpf-counters true || true
67 fi
68 exit 2
69fi
70
71test_bpf_counters
72test_bpf_modifier
73
74exit 0