1 // SPDX-License-Identifier: GPL-2.0
4 #include <sys/syscall.h>
13 #include "thread_map.h"
30 static struct thread_data threads[THREADS];
32 static int thread_init(struct thread_data *td)
36 map = mmap(NULL, page_size,
37 PROT_READ|PROT_WRITE|PROT_EXEC,
38 MAP_SHARED|MAP_ANONYMOUS, -1, 0);
40 if (map == MAP_FAILED) {
41 perror("mmap failed");
46 td->tid = syscall(SYS_gettid);
48 pr_debug("tid = %d, map = %p\n", td->tid, map);
52 static void *thread_fn(void *arg)
54 struct thread_data *td = arg;
61 /* Signal thread_create thread is initialized. */
62 ret = write(td->ready[1], &go, sizeof(int));
63 if (ret != sizeof(int)) {
64 pr_err("failed to notify\n");
69 /* Waiting for main thread to kill us. */
73 munmap(td->map, page_size);
77 static int thread_create(int i)
79 struct thread_data *td = &threads[i];
85 err = pthread_create(&td->pt, NULL, thread_fn, td);
87 /* Wait for thread initialization. */
88 ssize_t ret = read(td->ready[0], &go, sizeof(int));
89 err = ret != sizeof(int);
97 static int threads_create(void)
99 struct thread_data *td0 = &threads[0];
104 /* 0 is main thread */
105 if (thread_init(td0))
108 for (i = 1; !err && i < THREADS; i++)
109 err = thread_create(i);
114 static int threads_destroy(void)
116 struct thread_data *td0 = &threads[0];
119 /* cleanup the main thread */
120 munmap(td0->map, page_size);
124 for (i = 1; !err && i < THREADS; i++)
125 err = pthread_join(threads[i].pt, NULL);
130 typedef int (*synth_cb)(struct machine *machine);
132 static int synth_all(struct machine *machine)
134 return perf_event__synthesize_threads(NULL,
139 static int synth_process(struct machine *machine)
141 struct thread_map *map;
144 map = thread_map__new_by_pid(getpid());
146 err = perf_event__synthesize_thread_map(NULL, map,
150 thread_map__put(map);
154 static int mmap_events(synth_cb synth)
156 struct machine *machine;
160 * The threads_create will not return before all threads
161 * are spawned and all created memory map.
163 * They will loop until threads_destroy is called, so we
164 * can safely run synthesizing function.
166 TEST_ASSERT_VAL("failed to create threads", !threads_create());
168 machine = machine__new_host();
170 dump_trace = verbose > 1 ? 1 : 0;
172 err = synth(machine);
176 TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy());
177 TEST_ASSERT_VAL("failed to synthesize maps", !err);
180 * All data is synthesized, try to find map for each
183 for (i = 0; i < THREADS; i++) {
184 struct thread_data *td = &threads[i];
185 struct addr_location al;
186 struct thread *thread;
188 thread = machine__findnew_thread(machine, getpid(), td->tid);
190 pr_debug("looking for map %p\n", td->map);
192 thread__find_map(thread, PERF_RECORD_MISC_USER,
193 (unsigned long) (td->map + 1), &al);
198 pr_debug("failed, couldn't find map\n");
203 pr_debug("map %p, addr %" PRIx64 "\n", al.map, al.map->start);
206 machine__delete_threads(machine);
207 machine__delete(machine);
212 * This test creates 'THREADS' number of threads (including
213 * main thread) and each thread creates memory map.
215 * When threads are created, we synthesize them with both
217 * perf_event__synthesize_thread_map (process based)
218 * perf_event__synthesize_threads (global)
220 * We test we can find all memory maps via:
223 * by using all thread objects.
225 int test__mmap_thread_lookup(struct test *test __maybe_unused, int subtest __maybe_unused)
227 /* perf_event__synthesize_threads synthesize */
228 TEST_ASSERT_VAL("failed with sythesizing all",
229 !mmap_events(synth_all));
231 /* perf_event__synthesize_thread_map synthesize */
232 TEST_ASSERT_VAL("failed with sythesizing process",
233 !mmap_events(synth_process));