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 metrics (shadow stat) test
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7# skip if system-wide mode is forbidden
8perf stat -a true > /dev/null 2>&1 || exit 2
9
10test_global_aggr()
11{
12 local cyc
13
14 perf stat -a --no-big-num -e cycles,instructions sleep 1 2>&1 | \
15 grep -e cycles -e instructions | \
16 while read num evt hash ipc rest
17 do
18 # skip not counted events
19 if [[ $num == "<not" ]]; then
20 continue
21 fi
22
23 # save cycles count
24 if [[ $evt == "cycles" ]]; then
25 cyc=$num
26 continue
27 fi
28
29 # skip if no cycles
30 if [[ -z $cyc ]]; then
31 continue
32 fi
33
34 # use printf for rounding and a leading zero
35 local res=`printf "%.2f" $(echo "scale=6; $num / $cyc" | bc -q)`
36 if [[ $ipc != $res ]]; then
37 echo "IPC is different: $res != $ipc ($num / $cyc)"
38 exit 1
39 fi
40 done
41}
42
43test_no_aggr()
44{
45 declare -A results
46
47 perf stat -a -A --no-big-num -e cycles,instructions sleep 1 2>&1 | \
48 grep ^CPU | \
49 while read cpu num evt hash ipc rest
50 do
51 # skip not counted events
52 if [[ $num == "<not" ]]; then
53 continue
54 fi
55
56 # save cycles count
57 if [[ $evt == "cycles" ]]; then
58 results[$cpu]=$num
59 continue
60 fi
61
62 # skip if no cycles
63 local cyc=${results[$cpu]}
64 if [[ -z $cyc ]]; then
65 continue
66 fi
67
68 # use printf for rounding and a leading zero
69 local res=`printf "%.2f" $(echo "scale=6; $num / $cyc" | bc -q)`
70 if [[ $ipc != $res ]]; then
71 echo "IPC is different for $cpu: $res != $ipc ($num / $cyc)"
72 exit 1
73 fi
74 done
75}
76
77test_global_aggr
78test_no_aggr
79
80exit 0