1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <inttypes.h> |
3 | #include <unistd.h> |
4 | #include <sys/syscall.h> |
5 | #include <sys/types.h> |
6 | #include <sys/mman.h> |
7 | #include <pthread.h> |
8 | #include <stdlib.h> |
9 | #include <stdio.h> |
10 | #include "debug.h" |
11 | #include "event.h" |
12 | #include "tests.h" |
13 | #include "machine.h" |
14 | #include "thread_map.h" |
15 | #include "map.h" |
16 | #include "symbol.h" |
17 | #include "util/synthetic-events.h" |
18 | #include "thread.h" |
19 | #include <internal/lib.h> // page_size |
20 | |
21 | #define THREADS 4 |
22 | |
23 | static int go_away; |
24 | |
25 | struct thread_data { |
26 | pthread_t pt; |
27 | pid_t tid; |
28 | void *map; |
29 | int ready[2]; |
30 | }; |
31 | |
32 | static struct thread_data threads[THREADS]; |
33 | |
34 | static int thread_init(struct thread_data *td) |
35 | { |
36 | void *map; |
37 | |
38 | map = mmap(NULL, page_size, |
39 | PROT_READ|PROT_WRITE|PROT_EXEC, |
40 | MAP_SHARED|MAP_ANONYMOUS, -1, 0); |
41 | |
42 | if (map == MAP_FAILED) { |
43 | perror("mmap failed" ); |
44 | return -1; |
45 | } |
46 | |
47 | td->map = map; |
48 | td->tid = syscall(SYS_gettid); |
49 | |
50 | pr_debug("tid = %d, map = %p\n" , td->tid, map); |
51 | return 0; |
52 | } |
53 | |
54 | static void *thread_fn(void *arg) |
55 | { |
56 | struct thread_data *td = arg; |
57 | ssize_t ret; |
58 | int go = 0; |
59 | |
60 | if (thread_init(td)) |
61 | return NULL; |
62 | |
63 | /* Signal thread_create thread is initialized. */ |
64 | ret = write(td->ready[1], &go, sizeof(int)); |
65 | if (ret != sizeof(int)) { |
66 | pr_err("failed to notify\n" ); |
67 | return NULL; |
68 | } |
69 | |
70 | while (!go_away) { |
71 | /* Waiting for main thread to kill us. */ |
72 | usleep(100); |
73 | } |
74 | |
75 | munmap(td->map, page_size); |
76 | return NULL; |
77 | } |
78 | |
79 | static int thread_create(int i) |
80 | { |
81 | struct thread_data *td = &threads[i]; |
82 | int err, go; |
83 | |
84 | if (pipe(td->ready)) |
85 | return -1; |
86 | |
87 | err = pthread_create(&td->pt, NULL, thread_fn, td); |
88 | if (!err) { |
89 | /* Wait for thread initialization. */ |
90 | ssize_t ret = read(td->ready[0], &go, sizeof(int)); |
91 | err = ret != sizeof(int); |
92 | } |
93 | |
94 | close(td->ready[0]); |
95 | close(td->ready[1]); |
96 | return err; |
97 | } |
98 | |
99 | static int threads_create(void) |
100 | { |
101 | struct thread_data *td0 = &threads[0]; |
102 | int i, err = 0; |
103 | |
104 | go_away = 0; |
105 | |
106 | /* 0 is main thread */ |
107 | if (thread_init(td: td0)) |
108 | return -1; |
109 | |
110 | for (i = 1; !err && i < THREADS; i++) |
111 | err = thread_create(i); |
112 | |
113 | return err; |
114 | } |
115 | |
116 | static int threads_destroy(void) |
117 | { |
118 | struct thread_data *td0 = &threads[0]; |
119 | int i, err = 0; |
120 | |
121 | /* cleanup the main thread */ |
122 | munmap(td0->map, page_size); |
123 | |
124 | go_away = 1; |
125 | |
126 | for (i = 1; !err && i < THREADS; i++) |
127 | err = pthread_join(threads[i].pt, NULL); |
128 | |
129 | return err; |
130 | } |
131 | |
132 | typedef int (*synth_cb)(struct machine *machine); |
133 | |
134 | static int synth_all(struct machine *machine) |
135 | { |
136 | return perf_event__synthesize_threads(NULL, |
137 | perf_event__process, |
138 | machine, 1, 0, 1); |
139 | } |
140 | |
141 | static int synth_process(struct machine *machine) |
142 | { |
143 | struct perf_thread_map *map; |
144 | int err; |
145 | |
146 | map = thread_map__new_by_pid(getpid()); |
147 | |
148 | err = perf_event__synthesize_thread_map(NULL, map, |
149 | perf_event__process, |
150 | machine, 1, 0); |
151 | |
152 | perf_thread_map__put(map); |
153 | return err; |
154 | } |
155 | |
156 | static int mmap_events(synth_cb synth) |
157 | { |
158 | struct machine *machine; |
159 | int err, i; |
160 | |
161 | /* |
162 | * The threads_create will not return before all threads |
163 | * are spawned and all created memory map. |
164 | * |
165 | * They will loop until threads_destroy is called, so we |
166 | * can safely run synthesizing function. |
167 | */ |
168 | TEST_ASSERT_VAL("failed to create threads" , !threads_create()); |
169 | |
170 | machine = machine__new_host(); |
171 | |
172 | dump_trace = verbose > 1 ? 1 : 0; |
173 | |
174 | err = synth(machine); |
175 | |
176 | dump_trace = 0; |
177 | |
178 | TEST_ASSERT_VAL("failed to destroy threads" , !threads_destroy()); |
179 | TEST_ASSERT_VAL("failed to synthesize maps" , !err); |
180 | |
181 | /* |
182 | * All data is synthesized, try to find map for each |
183 | * thread object. |
184 | */ |
185 | for (i = 0; i < THREADS; i++) { |
186 | struct thread_data *td = &threads[i]; |
187 | struct addr_location al; |
188 | struct thread *thread; |
189 | |
190 | addr_location__init(&al); |
191 | thread = machine__findnew_thread(machine, getpid(), td->tid); |
192 | |
193 | pr_debug("looking for map %p\n" , td->map); |
194 | |
195 | thread__find_map(thread, PERF_RECORD_MISC_USER, |
196 | (unsigned long) (td->map + 1), &al); |
197 | |
198 | thread__put(thread); |
199 | |
200 | if (!al.map) { |
201 | pr_debug("failed, couldn't find map\n" ); |
202 | err = -1; |
203 | addr_location__exit(&al); |
204 | break; |
205 | } |
206 | |
207 | pr_debug("map %p, addr %" PRIx64 "\n" , al.map, map__start(al.map)); |
208 | addr_location__exit(&al); |
209 | } |
210 | |
211 | machine__delete(machine); |
212 | return err; |
213 | } |
214 | |
215 | /* |
216 | * This test creates 'THREADS' number of threads (including |
217 | * main thread) and each thread creates memory map. |
218 | * |
219 | * When threads are created, we synthesize them with both |
220 | * (separate tests): |
221 | * perf_event__synthesize_thread_map (process based) |
222 | * perf_event__synthesize_threads (global) |
223 | * |
224 | * We test we can find all memory maps via: |
225 | * thread__find_map |
226 | * |
227 | * by using all thread objects. |
228 | */ |
229 | static int test__mmap_thread_lookup(struct test_suite *test __maybe_unused, int subtest __maybe_unused) |
230 | { |
231 | /* perf_event__synthesize_threads synthesize */ |
232 | TEST_ASSERT_VAL("failed with sythesizing all" , |
233 | !mmap_events(synth_all)); |
234 | |
235 | /* perf_event__synthesize_thread_map synthesize */ |
236 | TEST_ASSERT_VAL("failed with sythesizing process" , |
237 | !mmap_events(synth_process)); |
238 | |
239 | return 0; |
240 | } |
241 | |
242 | DEFINE_SUITE("Lookup mmap thread" , mmap_thread_lookup); |
243 | |