Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#!/bin/bash
2# perf record tests
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7shelldir=$(dirname "$0")
8# shellcheck source=lib/waiting.sh
9. "${shelldir}"/lib/waiting.sh
10
11# shellcheck source=lib/perf_has_symbol.sh
12. "${shelldir}"/lib/perf_has_symbol.sh
13
14testsym="test_loop"
15
16skip_test_missing_symbol ${testsym}
17
18err=0
19perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
20testprog="perf test -w thloop"
21cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"
22br_cntr_file="/caps/branch_counter_nr"
23br_cntr_output="branch stack counters"
24br_cntr_script_output="br_cntr: A"
25
26default_fd_limit=$(ulimit -Sn)
27# With option --threads=cpu the number of open file descriptors should be
28# equal to sum of: nmb_cpus * nmb_events (2+dummy),
29# nmb_threads for perf.data.n (equal to nmb_cpus) and
30# 2*nmb_cpus of pipes = 4*nmb_cpus (each pipe has 2 ends)
31# All together it needs 8*nmb_cpus file descriptors plus some are also used
32# outside of testing, thus raising the limit to 16*nmb_cpus
33min_fd_limit=$(($(getconf _NPROCESSORS_ONLN) * 16))
34
35cleanup() {
36 rm -rf "${perfdata}"
37 rm -rf "${perfdata}".old
38
39 trap - EXIT TERM INT
40}
41
42trap_cleanup() {
43 cleanup
44 exit 1
45}
46trap trap_cleanup EXIT TERM INT
47
48test_per_thread() {
49 echo "Basic --per-thread mode test"
50 if ! perf record -o /dev/null --quiet ${testprog} 2> /dev/null
51 then
52 echo "Per-thread record [Skipped event not supported]"
53 return
54 fi
55 if ! perf record --per-thread -o "${perfdata}" ${testprog} 2> /dev/null
56 then
57 echo "Per-thread record [Failed record]"
58 err=1
59 return
60 fi
61 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
62 then
63 echo "Per-thread record [Failed missing output]"
64 err=1
65 return
66 fi
67
68 # run the test program in background (for 30 seconds)
69 ${testprog} 30 &
70 TESTPID=$!
71
72 rm -f "${perfdata}"
73
74 wait_for_threads ${TESTPID} 2
75 perf record -p "${TESTPID}" --per-thread -o "${perfdata}" sleep 1 2> /dev/null
76 kill ${TESTPID}
77
78 if [ ! -e "${perfdata}" ]
79 then
80 echo "Per-thread record [Failed record -p]"
81 err=1
82 return
83 fi
84 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
85 then
86 echo "Per-thread record [Failed -p missing output]"
87 err=1
88 return
89 fi
90
91 echo "Basic --per-thread mode test [Success]"
92}
93
94test_register_capture() {
95 echo "Register capture test"
96 if ! perf list | grep -q 'br_inst_retired.near_call'
97 then
98 echo "Register capture test [Skipped missing event]"
99 return
100 fi
101 if ! perf record --intr-regs=\? 2>&1 | grep -q 'available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15'
102 then
103 echo "Register capture test [Skipped missing registers]"
104 return
105 fi
106 if ! perf record -o - --intr-regs=di,r8,dx,cx -e br_inst_retired.near_call \
107 -c 1000 --per-thread ${testprog} 2> /dev/null \
108 | perf script -F ip,sym,iregs -i - 2> /dev/null \
109 | grep -q "DI:"
110 then
111 echo "Register capture test [Failed missing output]"
112 err=1
113 return
114 fi
115 echo "Register capture test [Success]"
116}
117
118test_system_wide() {
119 echo "Basic --system-wide mode test"
120 if ! perf record -aB --synth=no -o "${perfdata}" ${testprog} 2> /dev/null
121 then
122 echo "System-wide record [Skipped not supported]"
123 return
124 fi
125 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
126 then
127 echo "System-wide record [Failed missing output]"
128 err=1
129 return
130 fi
131 if ! perf record -aB --synth=no -e cpu-clock,cs --threads=cpu \
132 -o "${perfdata}" ${testprog} 2> /dev/null
133 then
134 echo "System-wide record [Failed record --threads option]"
135 err=1
136 return
137 fi
138 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
139 then
140 echo "System-wide record [Failed --threads missing output]"
141 err=1
142 return
143 fi
144 echo "Basic --system-wide mode test [Success]"
145}
146
147test_workload() {
148 echo "Basic target workload test"
149 if ! perf record -o "${perfdata}" ${testprog} 2> /dev/null
150 then
151 echo "Workload record [Failed record]"
152 err=1
153 return
154 fi
155 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
156 then
157 echo "Workload record [Failed missing output]"
158 err=1
159 return
160 fi
161 if ! perf record -e cpu-clock,cs --threads=package \
162 -o "${perfdata}" ${testprog} 2> /dev/null
163 then
164 echo "Workload record [Failed record --threads option]"
165 err=1
166 return
167 fi
168 if ! perf report -i "${perfdata}" -q | grep -q "${testsym}"
169 then
170 echo "Workload record [Failed --threads missing output]"
171 err=1
172 return
173 fi
174 echo "Basic target workload test [Success]"
175}
176
177test_branch_counter() {
178 echo "Branch counter test"
179 # Check if the branch counter feature is supported
180 for dir in $cpu_pmu_dir
181 do
182 if [ ! -e "$dir$br_cntr_file" ]
183 then
184 echo "branch counter feature not supported on all core PMUs ($dir) [Skipped]"
185 return
186 fi
187 done
188 if ! perf record -o "${perfdata}" -e "{branches:p,instructions}" -j any,counter ${testprog} 2> /dev/null
189 then
190 echo "Branch counter record test [Failed record]"
191 err=1
192 return
193 fi
194 if ! perf report -i "${perfdata}" -D -q | grep -q "$br_cntr_output"
195 then
196 echo "Branch counter report test [Failed missing output]"
197 err=1
198 return
199 fi
200 if ! perf script -i "${perfdata}" -F +brstackinsn,+brcntr | grep -q "$br_cntr_script_output"
201 then
202 echo " Branch counter script test [Failed missing output]"
203 err=1
204 return
205 fi
206 echo "Branch counter test [Success]"
207}
208
209test_cgroup() {
210 echo "Cgroup sampling test"
211 if ! perf record -aB --synth=cgroup --all-cgroups -o "${perfdata}" ${testprog} 2> /dev/null
212 then
213 echo "Cgroup sampling [Skipped not supported]"
214 return
215 fi
216 if ! perf report -i "${perfdata}" -D | grep -q "CGROUP"
217 then
218 echo "Cgroup sampling [Failed missing output]"
219 err=1
220 return
221 fi
222 if ! perf script -i "${perfdata}" -F cgroup | grep -q -v "unknown"
223 then
224 echo "Cgroup sampling [Failed cannot resolve cgroup names]"
225 err=1
226 return
227 fi
228 echo "Cgroup sampling test [Success]"
229}
230
231# raise the limit of file descriptors to minimum
232if [[ $default_fd_limit -lt $min_fd_limit ]]; then
233 ulimit -Sn $min_fd_limit
234fi
235
236test_per_thread
237test_register_capture
238test_system_wide
239test_workload
240test_branch_counter
241test_cgroup
242
243# restore the default value
244ulimit -Sn $default_fd_limit
245
246cleanup
247exit $err