![Jiri Olsa](/assets/img/avatar_default.png)
This is more straightforward than what we have now.
It also fixes a segfault within machine__exit, that's caused by not
creating kernel maps for machine.. We're calling
machine__destroy_kernel_maps in machine__exit since commit:
ebe9729c8c
perf machine: Fix to destroy kernel maps when machine exits
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1449131658-1841-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
234 lines
4.5 KiB
C
234 lines
4.5 KiB
C
#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "debug.h"
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#include "tests.h"
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#include "machine.h"
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#include "thread_map.h"
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#include "symbol.h"
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#include "thread.h"
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#define THREADS 4
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static int go_away;
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struct thread_data {
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pthread_t pt;
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pid_t tid;
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void *map;
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int ready[2];
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};
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static struct thread_data threads[THREADS];
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static int thread_init(struct thread_data *td)
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{
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void *map;
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map = mmap(NULL, page_size,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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if (map == MAP_FAILED) {
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perror("mmap failed");
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return -1;
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}
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td->map = map;
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td->tid = syscall(SYS_gettid);
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pr_debug("tid = %d, map = %p\n", td->tid, map);
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return 0;
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}
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static void *thread_fn(void *arg)
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{
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struct thread_data *td = arg;
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ssize_t ret;
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int go;
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if (thread_init(td))
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return NULL;
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/* Signal thread_create thread is initialized. */
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ret = write(td->ready[1], &go, sizeof(int));
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if (ret != sizeof(int)) {
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pr_err("failed to notify\n");
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return NULL;
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}
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while (!go_away) {
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/* Waiting for main thread to kill us. */
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usleep(100);
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}
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munmap(td->map, page_size);
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return NULL;
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}
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static int thread_create(int i)
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{
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struct thread_data *td = &threads[i];
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int err, go;
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if (pipe(td->ready))
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return -1;
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err = pthread_create(&td->pt, NULL, thread_fn, td);
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if (!err) {
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/* Wait for thread initialization. */
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ssize_t ret = read(td->ready[0], &go, sizeof(int));
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err = ret != sizeof(int);
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}
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close(td->ready[0]);
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close(td->ready[1]);
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return err;
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}
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static int threads_create(void)
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{
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struct thread_data *td0 = &threads[0];
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int i, err = 0;
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go_away = 0;
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/* 0 is main thread */
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if (thread_init(td0))
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return -1;
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for (i = 1; !err && i < THREADS; i++)
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err = thread_create(i);
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return err;
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}
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static int threads_destroy(void)
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{
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struct thread_data *td0 = &threads[0];
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int i, err = 0;
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/* cleanup the main thread */
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munmap(td0->map, page_size);
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go_away = 1;
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for (i = 1; !err && i < THREADS; i++)
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err = pthread_join(threads[i].pt, NULL);
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return err;
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}
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typedef int (*synth_cb)(struct machine *machine);
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static int synth_all(struct machine *machine)
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{
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return perf_event__synthesize_threads(NULL,
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perf_event__process,
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machine, 0, 500);
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}
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static int synth_process(struct machine *machine)
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{
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struct thread_map *map;
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int err;
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map = thread_map__new_by_pid(getpid());
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err = perf_event__synthesize_thread_map(NULL, map,
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perf_event__process,
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machine, 0, 500);
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thread_map__put(map);
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return err;
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}
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static int mmap_events(synth_cb synth)
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{
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struct machine *machine;
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int err, i;
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/*
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* The threads_create will not return before all threads
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* are spawned and all created memory map.
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*
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* They will loop until threads_destroy is called, so we
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* can safely run synthesizing function.
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*/
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TEST_ASSERT_VAL("failed to create threads", !threads_create());
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machine = machine__new_host();
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dump_trace = verbose > 1 ? 1 : 0;
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err = synth(machine);
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dump_trace = 0;
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TEST_ASSERT_VAL("failed to destroy threads", !threads_destroy());
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TEST_ASSERT_VAL("failed to synthesize maps", !err);
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/*
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* All data is synthesized, try to find map for each
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* thread object.
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*/
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for (i = 0; i < THREADS; i++) {
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struct thread_data *td = &threads[i];
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struct addr_location al;
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struct thread *thread;
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thread = machine__findnew_thread(machine, getpid(), td->tid);
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pr_debug("looking for map %p\n", td->map);
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thread__find_addr_map(thread,
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PERF_RECORD_MISC_USER, MAP__FUNCTION,
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(unsigned long) (td->map + 1), &al);
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thread__put(thread);
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if (!al.map) {
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pr_debug("failed, couldn't find map\n");
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err = -1;
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break;
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}
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pr_debug("map %p, addr %" PRIx64 "\n", al.map, al.map->start);
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}
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machine__delete_threads(machine);
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machine__delete(machine);
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return err;
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}
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/*
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* This test creates 'THREADS' number of threads (including
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* main thread) and each thread creates memory map.
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*
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* When threads are created, we synthesize them with both
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* (separate tests):
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* perf_event__synthesize_thread_map (process based)
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* perf_event__synthesize_threads (global)
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*
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* We test we can find all memory maps via:
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* thread__find_addr_map
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*
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* by using all thread objects.
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*/
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int test__mmap_thread_lookup(int subtest __maybe_unused)
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{
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/* perf_event__synthesize_threads synthesize */
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TEST_ASSERT_VAL("failed with sythesizing all",
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!mmap_events(synth_all));
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/* perf_event__synthesize_thread_map synthesize */
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TEST_ASSERT_VAL("failed with sythesizing process",
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!mmap_events(synth_process));
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return 0;
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}
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