1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include "debug.h" |
3 | #include "evlist.h" |
4 | #include "evsel.h" |
5 | #include "target.h" |
6 | #include "thread_map.h" |
7 | #include "tests.h" |
8 | #include "util/mmap.h" |
9 | |
10 | #include <errno.h> |
11 | #include <signal.h> |
12 | #include <linux/string.h> |
13 | #include <perf/cpumap.h> |
14 | #include <perf/evlist.h> |
15 | #include <perf/mmap.h> |
16 | |
17 | static int exited; |
18 | static int nr_exit; |
19 | |
20 | static void sig_handler(int sig __maybe_unused) |
21 | { |
22 | exited = 1; |
23 | } |
24 | |
25 | /* |
26 | * evlist__prepare_workload will send a SIGUSR1 if the fork fails, since |
27 | * we asked by setting its exec_error to this handler. |
28 | */ |
29 | static void workload_exec_failed_signal(int signo __maybe_unused, |
30 | siginfo_t *info __maybe_unused, |
31 | void *ucontext __maybe_unused) |
32 | { |
33 | exited = 1; |
34 | nr_exit = -1; |
35 | } |
36 | |
37 | /* |
38 | * This test will start a workload that does nothing then it checks |
39 | * if the number of exit event reported by the kernel is 1 or not |
40 | * in order to check the kernel returns correct number of event. |
41 | */ |
42 | static int test__task_exit(struct test_suite *test __maybe_unused, int subtest __maybe_unused) |
43 | { |
44 | int err = -1; |
45 | union perf_event *event; |
46 | struct evsel *evsel; |
47 | struct evlist *evlist; |
48 | struct target target = { |
49 | .uid = UINT_MAX, |
50 | .uses_mmap = true, |
51 | }; |
52 | const char *argv[] = { "true" , NULL }; |
53 | char sbuf[STRERR_BUFSIZE]; |
54 | struct perf_cpu_map *cpus; |
55 | struct perf_thread_map *threads; |
56 | struct mmap *md; |
57 | int retry_count = 0; |
58 | |
59 | signal(SIGCHLD, sig_handler); |
60 | |
61 | evlist = evlist__new_dummy(); |
62 | if (evlist == NULL) { |
63 | pr_debug("evlist__new_dummy\n" ); |
64 | return -1; |
65 | } |
66 | |
67 | /* |
68 | * Create maps of threads and cpus to monitor. In this case |
69 | * we start with all threads and cpus (-1, -1) but then in |
70 | * evlist__prepare_workload we'll fill in the only thread |
71 | * we're monitoring, the one forked there. |
72 | */ |
73 | cpus = perf_cpu_map__new_any_cpu(); |
74 | threads = thread_map__new_by_tid(-1); |
75 | if (!cpus || !threads) { |
76 | err = -ENOMEM; |
77 | pr_debug("Not enough memory to create thread/cpu maps\n" ); |
78 | goto out_delete_evlist; |
79 | } |
80 | |
81 | perf_evlist__set_maps(&evlist->core, cpus, threads); |
82 | |
83 | err = evlist__prepare_workload(evlist, &target, argv, false, workload_exec_failed_signal); |
84 | if (err < 0) { |
85 | pr_debug("Couldn't run the workload!\n" ); |
86 | goto out_delete_evlist; |
87 | } |
88 | |
89 | evsel = evlist__first(evlist); |
90 | evsel->core.attr.task = 1; |
91 | #ifdef __s390x__ |
92 | evsel->core.attr.sample_freq = 1000000; |
93 | #else |
94 | evsel->core.attr.sample_freq = 1; |
95 | #endif |
96 | evsel->core.attr.inherit = 0; |
97 | evsel->core.attr.watermark = 0; |
98 | evsel->core.attr.wakeup_events = 1; |
99 | evsel->core.attr.exclude_kernel = 1; |
100 | |
101 | err = evlist__open(evlist); |
102 | if (err < 0) { |
103 | pr_debug("Couldn't open the evlist: %s\n" , |
104 | str_error_r(-err, sbuf, sizeof(sbuf))); |
105 | goto out_delete_evlist; |
106 | } |
107 | |
108 | if (evlist__mmap(evlist, 128) < 0) { |
109 | pr_debug("failed to mmap events: %d (%s)\n" , errno, |
110 | str_error_r(errno, sbuf, sizeof(sbuf))); |
111 | err = -1; |
112 | goto out_delete_evlist; |
113 | } |
114 | |
115 | evlist__start_workload(evlist); |
116 | |
117 | retry: |
118 | md = &evlist->mmap[0]; |
119 | if (perf_mmap__read_init(&md->core) < 0) |
120 | goto out_init; |
121 | |
122 | while ((event = perf_mmap__read_event(&md->core)) != NULL) { |
123 | if (event->header.type == PERF_RECORD_EXIT) |
124 | nr_exit++; |
125 | |
126 | perf_mmap__consume(&md->core); |
127 | } |
128 | perf_mmap__read_done(&md->core); |
129 | |
130 | out_init: |
131 | if (!exited || !nr_exit) { |
132 | evlist__poll(evlist, -1); |
133 | |
134 | if (retry_count++ > 1000) { |
135 | pr_debug("Failed after retrying 1000 times\n" ); |
136 | err = -1; |
137 | goto out_delete_evlist; |
138 | } |
139 | |
140 | goto retry; |
141 | } |
142 | |
143 | if (nr_exit != 1) { |
144 | pr_debug("received %d EXIT records\n" , nr_exit); |
145 | err = -1; |
146 | } |
147 | |
148 | out_delete_evlist: |
149 | perf_cpu_map__put(cpus); |
150 | perf_thread_map__put(threads); |
151 | evlist__delete(evlist); |
152 | return err; |
153 | } |
154 | |
155 | DEFINE_SUITE("Number of exit events of a simple workload" , task_exit); |
156 | |