tjh.dev
Linux kernel mirror (for testing)
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linux
1#!/bin/bash
2# perf stat events uniquifying
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7stat_output=$(mktemp /tmp/__perf_test.stat_output.XXXXX)
8perf_tool=perf
9err=0
10
11test_event_uniquifying() {
12 # We use `clockticks` in `uncore_imc` to verify the uniquify behavior.
13 pmu="uncore_imc"
14 event="clockticks"
15
16 # If the `-A` option is added, the event should be uniquified.
17 #
18 # $perf list -v clockticks
19 #
20 # List of pre-defined events (to be used in -e or -M):
21 #
22 # uncore_imc_0/clockticks/ [Kernel PMU event]
23 # uncore_imc_1/clockticks/ [Kernel PMU event]
24 # uncore_imc_2/clockticks/ [Kernel PMU event]
25 # uncore_imc_3/clockticks/ [Kernel PMU event]
26 # uncore_imc_4/clockticks/ [Kernel PMU event]
27 # uncore_imc_5/clockticks/ [Kernel PMU event]
28 #
29 # ...
30 #
31 # $perf stat -e clockticks -A -- true
32 #
33 # Performance counter stats for 'system wide':
34 #
35 # CPU0 3,773,018 uncore_imc_0/clockticks/
36 # CPU0 3,609,025 uncore_imc_1/clockticks/
37 # CPU0 0 uncore_imc_2/clockticks/
38 # CPU0 3,230,009 uncore_imc_3/clockticks/
39 # CPU0 3,049,897 uncore_imc_4/clockticks/
40 # CPU0 0 uncore_imc_5/clockticks/
41 #
42 # 0.002029828 seconds time elapsed
43
44 echo "stat event uniquifying test"
45 uniquified_event_array=()
46
47 # Skip if the machine does not have `uncore_imc` device.
48 if ! ${perf_tool} list pmu | grep -q ${pmu}; then
49 echo "Target does not support PMU ${pmu} [Skipped]"
50 err=2
51 return
52 fi
53
54 # Check how many uniquified events.
55 while IFS= read -r line; do
56 uniquified_event=$(echo "$line" | awk '{print $1}')
57 uniquified_event_array+=("${uniquified_event}")
58 done < <(${perf_tool} list -v ${event} | grep ${pmu})
59
60 perf_command="${perf_tool} stat -e $event -A -o ${stat_output} -- true"
61 $perf_command
62
63 # Check the output contains all uniquified events.
64 for uniquified_event in "${uniquified_event_array[@]}"; do
65 if ! cat "${stat_output}" | grep -q "${uniquified_event}"; then
66 echo "Event is not uniquified [Failed]"
67 echo "${perf_command}"
68 cat "${stat_output}"
69 err=1
70 break
71 fi
72 done
73}
74
75test_event_uniquifying
76rm -f "${stat_output}"
77exit $err