--- /dev/null
+#ifdef LTTNGTOP_MMAP_LIVE
+
+static
+ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
+ struct lttng_consumer_local_data *ctx)
+{
+ unsigned long len;
+ int err;
+ long ret = 0;
+ int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
+
+ if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
+ /* Get the next subbuffer */
+ err = helper_kernctl_get_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ perror("Reserving sub buffer failed (everything is normal, "
+ "it is due to concurrency)");
+ goto end;
+ }
+ /* read the whole subbuffer */
+ err = helper_kernctl_get_padded_subbuf_size(infd, &len);
+ if (err != 0) {
+ ret = errno;
+ perror("Getting sub-buffer len failed.");
+ goto end;
+ }
+
+ /* splice the subbuffer to the tracefile */
+ ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len, 0);
+ if (ret < 0) {
+ /*
+ * display the error but continue processing to try
+ * to release the subbuffer
+ */
+ fprintf(stderr,"Error splicing to tracefile\n");
+ }
+ err = helper_kernctl_put_next_subbuf(infd);
+ if (err != 0) {
+ ret = errno;
+ perror("Reserving sub buffer failed (everything is normal, "
+ "it is due to concurrency)");
+ goto end;
+ }
+ sem_post(&metadata_available);
+ }
+
+end:
+ return 0;
+}
+
+static
+int on_update_fd(int key, uint32_t state)
+{
+ /* let the lib handle the metadata FD */
+ if (key == sessiond_metadata)
+ return 0;
+ return 1;
+}
+
+static
+int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
+{
+ int ret;
+ struct bt_mmap_stream *new_mmap_stream;
+
+ /* Opening the tracefile in write mode */
+ if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
+ ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
+ O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
+ if (ret < 0) {
+ perror("open");
+ goto end;
+ }
+ helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
+ }
+
+ if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
+ new_mmap_stream = malloc(sizeof(struct bt_mmap_stream));
+ new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
+ kconsumerd_fd);
+ bt_list_add(&new_mmap_stream->list, &mmap_list.head);
+
+ g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
+ /* keep mmap FDs internally */
+ ret = 1;
+ } else {
+ consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
+ sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
+ ret = 0;
+ }
+
+ reload_trace = 1;
+
+end:
+ return ret;
+}
+
+static
+void live_consume(struct bt_context **bt_ctx)
+{
+ int ret;
+ FILE *metadata_fp;
+
+ sem_wait(&metadata_available);
+ if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
+ fprintf(stderr,"no metadata\n");
+ goto end;
+ }
+ metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
+
+ *bt_ctx = bt_context_create();
+ ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
+ lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
+ if (ret < 0) {
+ printf("Error adding trace\n");
+ goto end;
+ }
+
+end:
+ return;
+}
+
+static
+int setup_consumer(char *command_sock_path, pthread_t *threads,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret = 0;
+
+ ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
+ read_subbuffer, NULL, on_recv_fd, on_update_fd);
+ if (!ctx)
+ goto end;
+
+ unlink(command_sock_path);
+ helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
+ helper_lttng_consumer_init();
+
+ /* Create the thread to manage the receive of fd */
+ ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_sessiond_poll,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create receive fd");
+ goto end;
+ }
+ /* Create thread to manage the polling/writing of traces */
+ ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_metadata_poll,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create poll fd");
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static
+int enable_kprobes(struct lttng_handle *handle, char *channel_name)
+{
+ struct lttng_event ev;
+ struct kprobes *kprobe;
+ int ret = 0;
+ int i;
+
+ for (i = 0; i < lttngtop.kprobes_table->len; i++) {
+ kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_PROBE;
+ if (kprobe->symbol_name)
+ sprintf(ev.attr.probe.symbol_name, "%s", kprobe->symbol_name);
+ sprintf(ev.name, "%s", kprobe->probe_name);
+ ev.attr.probe.addr = kprobe->probe_addr;
+ ev.attr.probe.offset = kprobe->probe_offset;
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling kprobes : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto end;
+ }
+ }
+
+end:
+ return ret;
+}
+
+static
+int setup_live_tracing()
+{
+ struct lttng_domain dom;
+ struct lttng_channel chan;
+ char *channel_name = "mmapchan";
+ struct lttng_event ev;
+ int ret = 0;
+ char *command_sock_path = "/tmp/consumerd_sock";
+ static pthread_t threads[2]; /* recv_fd, poll */
+ struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid,
+ kctxperf1, kctxperf2;
+
+ struct lttng_handle *handle;
+
+ BT_INIT_LIST_HEAD(&mmap_list.head);
+
+ lttng_consumer_stream_array = g_ptr_array_new();
+
+ if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
+ fprintf(stderr,"error setting up consumer\n");
+ goto error;
+ }
+
+ available_snapshots = g_ptr_array_new();
+
+ /* setup the session */
+ dom.type = LTTNG_DOMAIN_KERNEL;
+
+ ret = unlink("/tmp/livesession");
+
+ lttng_destroy_session("test");
+ if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
+ fprintf(stderr,"error creating the session : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error;
+ }
+
+ if ((handle = lttng_create_handle("test", &dom)) == NULL) {
+ fprintf(stderr,"error creating handle\n");
+ goto error_session;
+ }
+
+ /*
+ * FIXME : need to let the
+ * helper_lttng_consumer_thread_receive_fds create the
+ * socket.
+ * Cleaner solution ?
+ */
+ while (access(command_sock_path, F_OK)) {
+ sleep(0.1);
+ }
+
+ if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
+ fprintf(stderr,"error registering consumer : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ strcpy(chan.name, channel_name);
+ chan.attr.overwrite = 0;
+ if (opt_tid && opt_textdump) {
+ chan.attr.subbuf_size = 32768;
+ chan.attr.num_subbuf = 8;
+ } else {
+ //chan.attr.subbuf_size = 1048576; /* 1MB */
+ chan.attr.subbuf_size = 2097152; /* 1MB */
+ chan.attr.num_subbuf = 4;
+ }
+ chan.attr.switch_timer_interval = 0;
+ chan.attr.read_timer_interval = 200;
+ chan.attr.output = LTTNG_EVENT_MMAP;
+
+ if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
+ fprintf(stderr,"error creating channel : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_TRACEPOINT;
+ sprintf(ev.name, "sched_switch");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "sched_process_free");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "lttng_statedump_process_state");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "lttng_statedump_file_descriptor");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_SYSCALL;
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling syscalls : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ if (lttngtop.kprobes_table) {
+ ret = enable_kprobes(handle, channel_name);
+ if (ret < 0) {
+ goto error_session;
+ }
+ }
+
+ kctxperf1.ctx = LTTNG_EVENT_CONTEXT_PERF_COUNTER;
+ kctxperf1.u.perf_counter.type = 0; /* PERF_TYPE_HARDWARE */
+ kctxperf1.u.perf_counter.config = 5; /* PERF_COUNT_HW_BRANCH_MISSES */
+ sprintf(kctxperf1.u.perf_counter.name, "perf_branch_misses");
+ ret = lttng_add_context(handle, &kctxperf1, NULL, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "error enabling context %s\n",
+ kctxtid.u.perf_counter.name);
+ }
+
+ kctxperf2.ctx = LTTNG_EVENT_CONTEXT_PERF_COUNTER;
+ kctxperf2.u.perf_counter.type = 1; /* PERF_TYPE_SOFTWARE */
+ kctxperf2.u.perf_counter.config = 6; /* PERF_COUNT_SW_PAGE_FAULTS_MAJ */
+ sprintf(kctxperf2.u.perf_counter.name, "perf_major_faults");
+ ret = lttng_add_context(handle, &kctxperf2, NULL, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "error enabling context %s\n",
+ kctxtid.u.perf_counter.name);
+ }
+
+ kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
+ lttng_add_context(handle, &kctxpid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+ kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
+ lttng_add_context(handle, &kctxppid, NULL, NULL);
+ kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
+ lttng_add_context(handle, &kctxcomm, NULL, NULL);
+ kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
+ lttng_add_context(handle, &kctxpid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+
+
+ if ((ret = lttng_start_tracing("test")) < 0) {
+ fprintf(stderr,"error starting tracing : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ helper_kernctl_buffer_flush(consumerd_metadata);
+
+ /* block until metadata is ready */
+ sem_init(&metadata_available, 0, 0);
+
+ return 0;
+
+error_session:
+ lttng_destroy_session("test");
+error:
+ return -1;
+}
+
+int mmap_live_loop(struct bt_context *bt_ctx,
+ struct bt_mmap_stream_list mmap_list)
+{
+ struct bt_mmap_stream *mmap_info;
+
+ ret = setup_live_tracing();
+ if (ret < 0) {
+ goto end;
+ }
+
+ while (!quit) {
+ reload_trace = 0;
+ live_consume(&bt_ctx);
+ ret = check_requirements(bt_ctx);
+ if (ret < 0) {
+ fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
+ goto end;
+ }
+ iter_trace(bt_ctx);
+ /*
+ * FIXME : pb with cleanup in libbabeltrace
+ ret = bt_context_remove_trace(bt_ctx, 0);
+ if (ret != 0) {
+ fprintf(stderr, "error removing trace\n");
+ goto error;
+ }
+ */
+ if (bt_ctx) {
+ bt_context_put(bt_ctx);
+ }
+
+ /*
+ * since we receive all FDs every time there is an
+ * update and the FD number is different every time,
+ * we don't know which one are valid.
+ * so we check if all FDs are usable with a simple
+ * ioctl call.
+ */
+ bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
+ unsigned long mmap_len;
+
+ ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
+ if (ret != 0) {
+ bt_list_del(&mmap_info->list);
+ }
+ }
+ sem_post(&metadata_available);
+ }
+
+}
+
+void mmap_live_flush(struct bt_mmap_stream_list mmap_list)
+{
+ struct bt_mmap_stream *mmap_info;
+
+ bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
+ helper_kernctl_buffer_flush(mmap_info->fd);
+}
+#endif /* LTTNGTOP_MMAP_LIVE */
projects / lttngtop.git / blobdiff