1 // SPDX-License-Identifier: GPL-2.0
4 #include <sys/syscall.h>
13 #include "thread_map.h"
29 static struct thread_data threads[THREADS];
31 static int thread_init(struct thread_data *td)
35 map = mmap(NULL, page_size,
36 PROT_READ|PROT_WRITE|PROT_EXEC,
37 MAP_SHARED|MAP_ANONYMOUS, -1, 0);
39 if (map == MAP_FAILED) {
40 perror("mmap failed");
45 td->tid = syscall(SYS_gettid);
47 pr_debug("tid = %d, map = %p\n", td->tid, map);
51 static void *thread_fn(void *arg)
53 struct thread_data *td = arg;
60 /* Signal thread_create thread is initialized. */
61 ret = write(td->ready[1], &go, sizeof(int));
62 if (ret != sizeof(int)) {
63 pr_err("failed to notify\n");
68 /* Waiting for main thread to kill us. */
72 munmap(td->map, page_size);
76 static int thread_create(int i)
78 struct thread_data *td = &threads[i];
84 err = pthread_create(&td->pt, NULL, thread_fn, td);
86 /* Wait for thread initialization. */
87 ssize_t ret = read(td->ready[0], &go, sizeof(int));
88 err = ret != sizeof(int);
96 static int threads_create(void)
98 struct thread_data *td0 = &threads[0];
103 /* 0 is main thread */
104 if (thread_init(td0))
107 for (i = 1; !err && i < THREADS; i++)
108 err = thread_create(i);
113 static int threads_destroy(void)
115 struct thread_data *td0 = &threads[0];
118 /* cleanup the main thread */
119 munmap(td0->map, page_size);
123 for (i = 1; !err && i < THREADS; i++)
124 err = pthread_join(threads[i].pt, NULL);
129 typedef int (*synth_cb)(struct machine *machine);
131 static int synth_all(struct machine *machine)
133 return perf_event__synthesize_threads(NULL,
138 static int synth_process(struct machine *machine)
140 struct thread_map *map;
143 map = thread_map__new_by_pid(getpid());
145 err = perf_event__synthesize_thread_map(NULL, map,
149 thread_map__put(map);
153 static int mmap_events(synth_cb synth)
155 struct machine *machine;
159 * The threads_create will not return before all threads
160 * are spawned and all created memory map.
162 * They will loop until threads_destroy is called, so we
163 * can safely run synthesizing function.
165 TEST_ASSERT_VAL("failed to create threads", !threads_create());
167 machine = machine__new_host();
169 dump_trace = verbose > 1 ? 1 : 0;
171 err = synth(machine);
175 TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy());
176 TEST_ASSERT_VAL("failed to synthesize maps", !err);
179 * All data is synthesized, try to find map for each
182 for (i = 0; i < THREADS; i++) {
183 struct thread_data *td = &threads[i];
184 struct addr_location al;
185 struct thread *thread;
187 thread = machine__findnew_thread(machine, getpid(), td->tid);
189 pr_debug("looking for map %p\n", td->map);
191 thread__find_map(thread, PERF_RECORD_MISC_USER,
192 (unsigned long) (td->map + 1), &al);
197 pr_debug("failed, couldn't find map\n");
202 pr_debug("map %p, addr %" PRIx64 "\n", al.map, al.map->start);
205 machine__delete_threads(machine);
206 machine__delete(machine);
211 * This test creates 'THREADS' number of threads (including
212 * main thread) and each thread creates memory map.
214 * When threads are created, we synthesize them with both
216 * perf_event__synthesize_thread_map (process based)
217 * perf_event__synthesize_threads (global)
219 * We test we can find all memory maps via:
222 * by using all thread objects.
224 int test__mmap_thread_lookup(struct test *test __maybe_unused, int subtest __maybe_unused)
226 /* perf_event__synthesize_threads synthesize */
227 TEST_ASSERT_VAL("failed with sythesizing all",
228 !mmap_events(synth_all));
230 /* perf_event__synthesize_thread_map synthesize */
231 TEST_ASSERT_VAL("failed with sythesizing process",
232 !mmap_events(synth_process));