1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <errno.h> |
3 | #include <inttypes.h> |
4 | #include <unistd.h> |
5 | #include <stdlib.h> |
6 | #include <signal.h> |
7 | #include <sys/mman.h> |
8 | #include <linux/string.h> |
9 | |
10 | #include "tests.h" |
11 | #include "util/debug.h" |
12 | #include "util/evsel.h" |
13 | #include "util/evlist.h" |
14 | #include "util/cpumap.h" |
15 | #include "util/mmap.h" |
16 | #include "util/sample.h" |
17 | #include "util/thread_map.h" |
18 | #include <perf/evlist.h> |
19 | #include <perf/mmap.h> |
20 | |
21 | #define NR_LOOPS 10000000 |
22 | |
23 | /* |
24 | * This test will open software clock events (cpu-clock, task-clock) |
25 | * then check their frequency -> period conversion has no artifact of |
26 | * setting period to 1 forcefully. |
27 | */ |
28 | static int __test__sw_clock_freq(enum perf_sw_ids clock_id) |
29 | { |
30 | int i, err = -1; |
31 | volatile int tmp = 0; |
32 | u64 total_periods = 0; |
33 | int nr_samples = 0; |
34 | char sbuf[STRERR_BUFSIZE]; |
35 | union perf_event *event; |
36 | struct evsel *evsel; |
37 | struct evlist *evlist; |
38 | struct perf_event_attr attr = { |
39 | .type = PERF_TYPE_SOFTWARE, |
40 | .config = clock_id, |
41 | .sample_type = PERF_SAMPLE_PERIOD, |
42 | .exclude_kernel = 1, |
43 | .disabled = 1, |
44 | .freq = 1, |
45 | }; |
46 | struct perf_cpu_map *cpus = NULL; |
47 | struct perf_thread_map *threads = NULL; |
48 | struct mmap *md; |
49 | |
50 | attr.sample_freq = 500; |
51 | |
52 | evlist = evlist__new(); |
53 | if (evlist == NULL) { |
54 | pr_debug("evlist__new\n" ); |
55 | return -1; |
56 | } |
57 | |
58 | evsel = evsel__new(&attr); |
59 | if (evsel == NULL) { |
60 | pr_debug("evsel__new\n" ); |
61 | goto out_delete_evlist; |
62 | } |
63 | evlist__add(evlist, evsel); |
64 | |
65 | cpus = perf_cpu_map__new_any_cpu(); |
66 | threads = thread_map__new_by_tid(getpid()); |
67 | if (!cpus || !threads) { |
68 | err = -ENOMEM; |
69 | pr_debug("Not enough memory to create thread/cpu maps\n" ); |
70 | goto out_delete_evlist; |
71 | } |
72 | |
73 | perf_evlist__set_maps(&evlist->core, cpus, threads); |
74 | |
75 | if (evlist__open(evlist)) { |
76 | const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate" ; |
77 | |
78 | err = -errno; |
79 | pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n" , |
80 | str_error_r(errno, sbuf, sizeof(sbuf)), |
81 | knob, (u64)attr.sample_freq); |
82 | goto out_delete_evlist; |
83 | } |
84 | |
85 | err = evlist__mmap(evlist, 128); |
86 | if (err < 0) { |
87 | pr_debug("failed to mmap event: %d (%s)\n" , errno, |
88 | str_error_r(errno, sbuf, sizeof(sbuf))); |
89 | goto out_delete_evlist; |
90 | } |
91 | |
92 | evlist__enable(evlist); |
93 | |
94 | /* collect samples */ |
95 | for (i = 0; i < NR_LOOPS; i++) |
96 | tmp++; |
97 | |
98 | evlist__disable(evlist); |
99 | |
100 | md = &evlist->mmap[0]; |
101 | if (perf_mmap__read_init(&md->core) < 0) |
102 | goto out_init; |
103 | |
104 | while ((event = perf_mmap__read_event(&md->core)) != NULL) { |
105 | struct perf_sample sample; |
106 | |
107 | if (event->header.type != PERF_RECORD_SAMPLE) |
108 | goto next_event; |
109 | |
110 | err = evlist__parse_sample(evlist, event, &sample); |
111 | if (err < 0) { |
112 | pr_debug("Error during parse sample\n" ); |
113 | goto out_delete_evlist; |
114 | } |
115 | |
116 | total_periods += sample.period; |
117 | nr_samples++; |
118 | next_event: |
119 | perf_mmap__consume(&md->core); |
120 | } |
121 | perf_mmap__read_done(&md->core); |
122 | |
123 | out_init: |
124 | if ((u64) nr_samples == total_periods) { |
125 | pr_debug("All (%d) samples have period value of 1!\n" , |
126 | nr_samples); |
127 | err = -1; |
128 | } |
129 | |
130 | out_delete_evlist: |
131 | perf_cpu_map__put(cpus); |
132 | perf_thread_map__put(threads); |
133 | evlist__delete(evlist); |
134 | return err; |
135 | } |
136 | |
137 | static int test__sw_clock_freq(struct test_suite *test __maybe_unused, int subtest __maybe_unused) |
138 | { |
139 | int ret; |
140 | |
141 | ret = __test__sw_clock_freq(clock_id: PERF_COUNT_SW_CPU_CLOCK); |
142 | if (!ret) |
143 | ret = __test__sw_clock_freq(clock_id: PERF_COUNT_SW_TASK_CLOCK); |
144 | |
145 | return ret; |
146 | } |
147 | |
148 | DEFINE_SUITE("Software clock events period values" , sw_clock_freq); |
149 | |