tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/bin/bash
2# AMD IBS software filtering
3
4ParanoidAndNotRoot() {
5 [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
6}
7
8echo "check availability of IBS swfilt"
9
10# check if IBS PMU is available
11if [ ! -d /sys/bus/event_source/devices/ibs_op ]; then
12 echo "[SKIP] IBS PMU does not exist"
13 exit 2
14fi
15
16# check if IBS PMU has swfilt format
17if [ ! -f /sys/bus/event_source/devices/ibs_op/format/swfilt ]; then
18 echo "[SKIP] IBS PMU does not have swfilt"
19 exit 2
20fi
21
22echo "run perf record with modifier and swfilt"
23err=0
24
25# setting any modifiers should fail
26perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null
27if [ $? -eq 0 ]; then
28 echo "[FAIL] IBS PMU should not accept exclude_kernel"
29 exit 1
30fi
31
32# setting it with swfilt should be fine
33perf record -B -e ibs_op/swfilt/u -o /dev/null true
34if [ $? -ne 0 ]; then
35 echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_kernel"
36 exit 1
37fi
38
39if ! ParanoidAndNotRoot 1
40then
41 # setting it with swfilt=1 should be fine
42 perf record -B -e ibs_op/swfilt=1/k -o /dev/null true
43 if [ $? -ne 0 ]; then
44 echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_user"
45 exit 1
46 fi
47else
48 echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
49 err=2
50fi
51
52# check ibs_fetch PMU as well
53perf record -B -e ibs_fetch/swfilt/u -o /dev/null true
54if [ $? -ne 0 ]; then
55 echo "[FAIL] IBS fetch PMU cannot handle swfilt for exclude_kernel"
56 exit 1
57fi
58
59# check system wide recording
60if ! ParanoidAndNotRoot 0
61then
62 perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
63 if [ $? -ne 0 ]; then
64 echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
65 exit 1
66 fi
67else
68 echo "[SKIP] not root and perf_event_paranoid too high for system-wide/exclude_user"
69 err=2
70fi
71
72echo "check number of samples with swfilt"
73
74kernel_sample=$(perf record -e ibs_op/swfilt/u -o- true | perf script -i- -F misc | grep -c ^K)
75if [ ${kernel_sample} -ne 0 ]; then
76 echo "[FAIL] unexpected kernel samples: " ${kernel_sample}
77 exit 1
78fi
79
80if ! ParanoidAndNotRoot 1
81then
82 user_sample=$(perf record -e ibs_fetch/swfilt/k -o- true | perf script -i- -F misc | grep -c ^U)
83 if [ ${user_sample} -ne 0 ]; then
84 echo "[FAIL] unexpected user samples: " ${user_sample}
85 exit 1
86 fi
87else
88 echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
89 err=2
90fi
91
92exit $err