| #define _FILE_OFFSET_BITS 64 |
| |
| #include <linux/kernel.h> |
| |
| #include <byteswap.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/mman.h> |
| |
| #include "evlist.h" |
| #include "evsel.h" |
| #include "session.h" |
| #include "sort.h" |
| #include "util.h" |
| |
| static int perf_session__open(struct perf_session *self, bool force) |
| { |
| struct stat input_stat; |
| |
| if (!strcmp(self->filename, "-")) { |
| self->fd_pipe = true; |
| self->fd = STDIN_FILENO; |
| |
| if (perf_session__read_header(self, self->fd) < 0) |
| pr_err("incompatible file format"); |
| |
| return 0; |
| } |
| |
| self->fd = open(self->filename, O_RDONLY); |
| if (self->fd < 0) { |
| int err = errno; |
| |
| pr_err("failed to open %s: %s", self->filename, strerror(err)); |
| if (err == ENOENT && !strcmp(self->filename, "perf.data")) |
| pr_err(" (try 'perf record' first)"); |
| pr_err("\n"); |
| return -errno; |
| } |
| |
| if (fstat(self->fd, &input_stat) < 0) |
| goto out_close; |
| |
| if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { |
| pr_err("file %s not owned by current user or root\n", |
| self->filename); |
| goto out_close; |
| } |
| |
| if (!input_stat.st_size) { |
| pr_info("zero-sized file (%s), nothing to do!\n", |
| self->filename); |
| goto out_close; |
| } |
| |
| if (perf_session__read_header(self, self->fd) < 0) { |
| pr_err("incompatible file format"); |
| goto out_close; |
| } |
| |
| if (!perf_evlist__valid_sample_type(self->evlist)) { |
| pr_err("non matching sample_type"); |
| goto out_close; |
| } |
| |
| if (!perf_evlist__valid_sample_id_all(self->evlist)) { |
| pr_err("non matching sample_id_all"); |
| goto out_close; |
| } |
| |
| self->size = input_stat.st_size; |
| return 0; |
| |
| out_close: |
| close(self->fd); |
| self->fd = -1; |
| return -1; |
| } |
| |
| static void perf_session__id_header_size(struct perf_session *session) |
| { |
| struct perf_sample *data; |
| u64 sample_type = session->sample_type; |
| u16 size = 0; |
| |
| if (!session->sample_id_all) |
| goto out; |
| |
| if (sample_type & PERF_SAMPLE_TID) |
| size += sizeof(data->tid) * 2; |
| |
| if (sample_type & PERF_SAMPLE_TIME) |
| size += sizeof(data->time); |
| |
| if (sample_type & PERF_SAMPLE_ID) |
| size += sizeof(data->id); |
| |
| if (sample_type & PERF_SAMPLE_STREAM_ID) |
| size += sizeof(data->stream_id); |
| |
| if (sample_type & PERF_SAMPLE_CPU) |
| size += sizeof(data->cpu) * 2; |
| out: |
| session->id_hdr_size = size; |
| } |
| |
| void perf_session__update_sample_type(struct perf_session *self) |
| { |
| self->sample_type = perf_evlist__sample_type(self->evlist); |
| self->sample_size = __perf_evsel__sample_size(self->sample_type); |
| self->sample_id_all = perf_evlist__sample_id_all(self->evlist); |
| perf_session__id_header_size(self); |
| } |
| |
| int perf_session__create_kernel_maps(struct perf_session *self) |
| { |
| int ret = machine__create_kernel_maps(&self->host_machine); |
| |
| if (ret >= 0) |
| ret = machines__create_guest_kernel_maps(&self->machines); |
| return ret; |
| } |
| |
| static void perf_session__destroy_kernel_maps(struct perf_session *self) |
| { |
| machine__destroy_kernel_maps(&self->host_machine); |
| machines__destroy_guest_kernel_maps(&self->machines); |
| } |
| |
| struct perf_session *perf_session__new(const char *filename, int mode, |
| bool force, bool repipe, |
| struct perf_event_ops *ops) |
| { |
| size_t len = filename ? strlen(filename) + 1 : 0; |
| struct perf_session *self = zalloc(sizeof(*self) + len); |
| |
| if (self == NULL) |
| goto out; |
| |
| memcpy(self->filename, filename, len); |
| self->threads = RB_ROOT; |
| INIT_LIST_HEAD(&self->dead_threads); |
| self->last_match = NULL; |
| /* |
| * On 64bit we can mmap the data file in one go. No need for tiny mmap |
| * slices. On 32bit we use 32MB. |
| */ |
| #if BITS_PER_LONG == 64 |
| self->mmap_window = ULLONG_MAX; |
| #else |
| self->mmap_window = 32 * 1024 * 1024ULL; |
| #endif |
| self->machines = RB_ROOT; |
| self->repipe = repipe; |
| INIT_LIST_HEAD(&self->ordered_samples.samples); |
| INIT_LIST_HEAD(&self->ordered_samples.sample_cache); |
| INIT_LIST_HEAD(&self->ordered_samples.to_free); |
| machine__init(&self->host_machine, "", HOST_KERNEL_ID); |
| |
| if (mode == O_RDONLY) { |
| if (perf_session__open(self, force) < 0) |
| goto out_delete; |
| perf_session__update_sample_type(self); |
| } else if (mode == O_WRONLY) { |
| /* |
| * In O_RDONLY mode this will be performed when reading the |
| * kernel MMAP event, in perf_event__process_mmap(). |
| */ |
| if (perf_session__create_kernel_maps(self) < 0) |
| goto out_delete; |
| } |
| |
| if (ops && ops->ordering_requires_timestamps && |
| ops->ordered_samples && !self->sample_id_all) { |
| dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); |
| ops->ordered_samples = false; |
| } |
| |
| out: |
| return self; |
| out_delete: |
| perf_session__delete(self); |
| return NULL; |
| } |
| |
| static void perf_session__delete_dead_threads(struct perf_session *self) |
| { |
| struct thread *n, *t; |
| |
| list_for_each_entry_safe(t, n, &self->dead_threads, node) { |
| list_del(&t->node); |
| thread__delete(t); |
| } |
| } |
| |
| static void perf_session__delete_threads(struct perf_session *self) |
| { |
| struct rb_node *nd = rb_first(&self->threads); |
| |
| while (nd) { |
| struct thread *t = rb_entry(nd, struct thread, rb_node); |
| |
| rb_erase(&t->rb_node, &self->threads); |
| nd = rb_next(nd); |
| thread__delete(t); |
| } |
| } |
| |
| void perf_session__delete(struct perf_session *self) |
| { |
| perf_session__destroy_kernel_maps(self); |
| perf_session__delete_dead_threads(self); |
| perf_session__delete_threads(self); |
| machine__exit(&self->host_machine); |
| close(self->fd); |
| free(self); |
| } |
| |
| void perf_session__remove_thread(struct perf_session *self, struct thread *th) |
| { |
| self->last_match = NULL; |
| rb_erase(&th->rb_node, &self->threads); |
| /* |
| * We may have references to this thread, for instance in some hist_entry |
| * instances, so just move them to a separate list. |
| */ |
| list_add_tail(&th->node, &self->dead_threads); |
| } |
| |
| static bool symbol__match_parent_regex(struct symbol *sym) |
| { |
| if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) |
| return 1; |
| |
| return 0; |
| } |
| |
| int perf_session__resolve_callchain(struct perf_session *self, |
| struct thread *thread, |
| struct ip_callchain *chain, |
| struct symbol **parent) |
| { |
| u8 cpumode = PERF_RECORD_MISC_USER; |
| unsigned int i; |
| int err; |
| |
| callchain_cursor_reset(&self->callchain_cursor); |
| |
| for (i = 0; i < chain->nr; i++) { |
| u64 ip = chain->ips[i]; |
| struct addr_location al; |
| |
| if (ip >= PERF_CONTEXT_MAX) { |
| switch (ip) { |
| case PERF_CONTEXT_HV: |
| cpumode = PERF_RECORD_MISC_HYPERVISOR; break; |
| case PERF_CONTEXT_KERNEL: |
| cpumode = PERF_RECORD_MISC_KERNEL; break; |
| case PERF_CONTEXT_USER: |
| cpumode = PERF_RECORD_MISC_USER; break; |
| default: |
| break; |
| } |
| continue; |
| } |
| |
| al.filtered = false; |
| thread__find_addr_location(thread, self, cpumode, |
| MAP__FUNCTION, thread->pid, ip, &al, NULL); |
| if (al.sym != NULL) { |
| if (sort__has_parent && !*parent && |
| symbol__match_parent_regex(al.sym)) |
| *parent = al.sym; |
| if (!symbol_conf.use_callchain) |
| break; |
| } |
| |
| err = callchain_cursor_append(&self->callchain_cursor, |
| ip, al.map, al.sym); |
| if (err) |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static int process_event_synth_stub(union perf_event *event __used, |
| struct perf_session *session __used) |
| { |
| dump_printf(": unhandled!\n"); |
| return 0; |
| } |
| |
| static int process_event_sample_stub(union perf_event *event __used, |
| struct perf_sample *sample __used, |
| struct perf_evsel *evsel __used, |
| struct perf_session *session __used) |
| { |
| dump_printf(": unhandled!\n"); |
| return 0; |
| } |
| |
| static int process_event_stub(union perf_event *event __used, |
| struct perf_sample *sample __used, |
| struct perf_session *session __used) |
| { |
| dump_printf(": unhandled!\n"); |
| return 0; |
| } |
| |
| static int process_finished_round_stub(union perf_event *event __used, |
| struct perf_session *session __used, |
| struct perf_event_ops *ops __used) |
| { |
| dump_printf(": unhandled!\n"); |
| return 0; |
| } |
| |
| static int process_finished_round(union perf_event *event, |
| struct perf_session *session, |
| struct perf_event_ops *ops); |
| |
| static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) |
| { |
| if (handler->sample == NULL) |
| handler->sample = process_event_sample_stub; |
| if (handler->mmap == NULL) |
| handler->mmap = process_event_stub; |
| if (handler->comm == NULL) |
| handler->comm = process_event_stub; |
| if (handler->fork == NULL) |
| handler->fork = process_event_stub; |
| if (handler->exit == NULL) |
| handler->exit = process_event_stub; |
| if (handler->lost == NULL) |
| handler->lost = perf_event__process_lost; |
| if (handler->read == NULL) |
| handler->read = process_event_stub; |
| if (handler->throttle == NULL) |
| handler->throttle = process_event_stub; |
| if (handler->unthrottle == NULL) |
| handler->unthrottle = process_event_stub; |
| if (handler->attr == NULL) |
| handler->attr = process_event_synth_stub; |
| if (handler->event_type == NULL) |
| handler->event_type = process_event_synth_stub; |
| if (handler->tracing_data == NULL) |
| handler->tracing_data = process_event_synth_stub; |
| if (handler->build_id == NULL) |
| handler->build_id = process_event_synth_stub; |
| if (handler->finished_round == NULL) { |
| if (handler->ordered_samples) |
| handler->finished_round = process_finished_round; |
| else |
| handler->finished_round = process_finished_round_stub; |
| } |
| } |
| |
| void mem_bswap_64(void *src, int byte_size) |
| { |
| u64 *m = src; |
| |
| while (byte_size > 0) { |
| *m = bswap_64(*m); |
| byte_size -= sizeof(u64); |
| ++m; |
| } |
| } |
| |
| static void perf_event__all64_swap(union perf_event *event) |
| { |
| struct perf_event_header *hdr = &event->header; |
| mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); |
| } |
| |
| static void perf_event__comm_swap(union perf_event *event) |
| { |
| event->comm.pid = bswap_32(event->comm.pid); |
| event->comm.tid = bswap_32(event->comm.tid); |
| } |
| |
| static void perf_event__mmap_swap(union perf_event *event) |
| { |
| event->mmap.pid = bswap_32(event->mmap.pid); |
| event->mmap.tid = bswap_32(event->mmap.tid); |
| event->mmap.start = bswap_64(event->mmap.start); |
| event->mmap.len = bswap_64(event->mmap.len); |
| event->mmap.pgoff = bswap_64(event->mmap.pgoff); |
| } |
| |
| static void perf_event__task_swap(union perf_event *event) |
| { |
| event->fork.pid = bswap_32(event->fork.pid); |
| event->fork.tid = bswap_32(event->fork.tid); |
| event->fork.ppid = bswap_32(event->fork.ppid); |
| event->fork.ptid = bswap_32(event->fork.ptid); |
| event->fork.time = bswap_64(event->fork.time); |
| } |
| |
| static void perf_event__read_swap(union perf_event *event) |
| { |
| event->read.pid = bswap_32(event->read.pid); |
| event->read.tid = bswap_32(event->read.tid); |
| event->read.value = bswap_64(event->read.value); |
| event->read.time_enabled = bswap_64(event->read.time_enabled); |
| event->read.time_running = bswap_64(event->read.time_running); |
| event->read.id = bswap_64(event->read.id); |
| } |
| |
| /* exported for swapping attributes in file header */ |
| void perf_event__attr_swap(struct perf_event_attr *attr) |
| { |
| attr->type = bswap_32(attr->type); |
| attr->size = bswap_32(attr->size); |
| attr->config = bswap_64(attr->config); |
| attr->sample_period = bswap_64(attr->sample_period); |
| attr->sample_type = bswap_64(attr->sample_type); |
| attr->read_format = bswap_64(attr->read_format); |
| attr->wakeup_events = bswap_32(attr->wakeup_events); |
| attr->bp_type = bswap_32(attr->bp_type); |
| attr->bp_addr = bswap_64(attr->bp_addr); |
| attr->bp_len = bswap_64(attr->bp_len); |
| } |
| |
| static void perf_event__hdr_attr_swap(union perf_event *event) |
| { |
| size_t size; |
| |
| perf_event__attr_swap(&event->attr.attr); |
| |
| size = event->header.size; |
| size -= (void *)&event->attr.id - (void *)event; |
| mem_bswap_64(event->attr.id, size); |
| } |
| |
| static void perf_event__event_type_swap(union perf_event *event) |
| { |
| event->event_type.event_type.event_id = |
| bswap_64(event->event_type.event_type.event_id); |
| } |
| |
| static void perf_event__tracing_data_swap(union perf_event *event) |
| { |
| event->tracing_data.size = bswap_32(event->tracing_data.size); |
| } |
| |
| typedef void (*perf_event__swap_op)(union perf_event *event); |
| |
| static perf_event__swap_op perf_event__swap_ops[] = { |
| [PERF_RECORD_MMAP] = perf_event__mmap_swap, |
| [PERF_RECORD_COMM] = perf_event__comm_swap, |
| [PERF_RECORD_FORK] = perf_event__task_swap, |
| [PERF_RECORD_EXIT] = perf_event__task_swap, |
| [PERF_RECORD_LOST] = perf_event__all64_swap, |
| [PERF_RECORD_READ] = perf_event__read_swap, |
| [PERF_RECORD_SAMPLE] = perf_event__all64_swap, |
| [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, |
| [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, |
| [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, |
| [PERF_RECORD_HEADER_BUILD_ID] = NULL, |
| [PERF_RECORD_HEADER_MAX] = NULL, |
| }; |
| |
| struct sample_queue { |
| u64 timestamp; |
| u64 file_offset; |
| union perf_event *event; |
| struct list_head list; |
| }; |
| |
| static void perf_session_free_sample_buffers(struct perf_session *session) |
| { |
| struct ordered_samples *os = &session->ordered_samples; |
| |
| while (!list_empty(&os->to_free)) { |
| struct sample_queue *sq; |
| |
| sq = list_entry(os->to_free.next, struct sample_queue, list); |
| list_del(&sq->list); |
| free(sq); |
| } |
| } |
| |
| static int perf_session_deliver_event(struct perf_session *session, |
| union perf_event *event, |
| struct perf_sample *sample, |
| struct perf_event_ops *ops, |
| u64 file_offset); |
| |
| static void flush_sample_queue(struct perf_session *s, |
| struct perf_event_ops *ops) |
| { |
| struct ordered_samples *os = &s->ordered_samples; |
| struct list_head *head = &os->samples; |
| struct sample_queue *tmp, *iter; |
| struct perf_sample sample; |
| u64 limit = os->next_flush; |
| u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; |
| int ret; |
| |
| if (!ops->ordered_samples || !limit) |
| return; |
| |
| list_for_each_entry_safe(iter, tmp, head, list) { |
| if (iter->timestamp > limit) |
| break; |
| |
| ret = perf_session__parse_sample(s, iter->event, &sample); |
| if (ret) |
| pr_err("Can't parse sample, err = %d\n", ret); |
| else |
| perf_session_deliver_event(s, iter->event, &sample, ops, |
| iter->file_offset); |
| |
| os->last_flush = iter->timestamp; |
| list_del(&iter->list); |
| list_add(&iter->list, &os->sample_cache); |
| } |
| |
| if (list_empty(head)) { |
| os->last_sample = NULL; |
| } else if (last_ts <= limit) { |
| os->last_sample = |
| list_entry(head->prev, struct sample_queue, list); |
| } |
| } |
| |
| /* |
| * When perf record finishes a pass on every buffers, it records this pseudo |
| * event. |
| * We record the max timestamp t found in the pass n. |
| * Assuming these timestamps are monotonic across cpus, we know that if |
| * a buffer still has events with timestamps below t, they will be all |
| * available and then read in the pass n + 1. |
| * Hence when we start to read the pass n + 2, we can safely flush every |
| * events with timestamps below t. |
| * |
| * ============ PASS n ================= |
| * CPU 0 | CPU 1 |
| * | |
| * cnt1 timestamps | cnt2 timestamps |
| * 1 | 2 |
| * 2 | 3 |
| * - | 4 <--- max recorded |
| * |
| * ============ PASS n + 1 ============== |
| * CPU 0 | CPU 1 |
| * | |
| * cnt1 timestamps | cnt2 timestamps |
| * 3 | 5 |
| * 4 | 6 |
| * 5 | 7 <---- max recorded |
| * |
| * Flush every events below timestamp 4 |
| * |
| * ============ PASS n + 2 ============== |
| * CPU 0 | CPU 1 |
| * | |
| * cnt1 timestamps | cnt2 timestamps |
| * 6 | 8 |
| * 7 | 9 |
| * - | 10 |
| * |
| * Flush every events below timestamp 7 |
| * etc... |
| */ |
| static int process_finished_round(union perf_event *event __used, |
| struct perf_session *session, |
| struct perf_event_ops *ops) |
| { |
| flush_sample_queue(session, ops); |
| session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; |
| |
| return 0; |
| } |
| |
| /* The queue is ordered by time */ |
| static void __queue_event(struct sample_queue *new, struct perf_session *s) |
| { |
| struct ordered_samples *os = &s->ordered_samples; |
| struct sample_queue *sample = os->last_sample; |
| u64 timestamp = new->timestamp; |
| struct list_head *p; |
| |
| os->last_sample = new; |
| |
| if (!sample) { |
| list_add(&new->list, &os->samples); |
| os->max_timestamp = timestamp; |
| return; |
| } |
| |
| /* |
| * last_sample might point to some random place in the list as it's |
| * the last queued event. We expect that the new event is close to |
| * this. |
| */ |
| if (sample->timestamp <= timestamp) { |
| while (sample->timestamp <= timestamp) { |
| p = sample->list.next; |
| if (p == &os->samples) { |
| list_add_tail(&new->list, &os->samples); |
| os->max_timestamp = timestamp; |
| return; |
| } |
| sample = list_entry(p, struct sample_queue, list); |
| } |
| list_add_tail(&new->list, &sample->list); |
| } else { |
| while (sample->timestamp > timestamp) { |
| p = sample->list.prev; |
| if (p == &os->samples) { |
| list_add(&new->list, &os->samples); |
| return; |
| } |
| sample = list_entry(p, struct sample_queue, list); |
| } |
| list_add(&new->list, &sample->list); |
| } |
| } |
| |
| #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) |
| |
| static int perf_session_queue_event(struct perf_session *s, union perf_event *event, |
| struct perf_sample *sample, u64 file_offset) |
| { |
| struct ordered_samples *os = &s->ordered_samples; |
| struct list_head *sc = &os->sample_cache; |
| u64 timestamp = sample->time; |
| struct sample_queue *new; |
| |
| if (!timestamp || timestamp == ~0ULL) |
| return -ETIME; |
| |
| if (timestamp < s->ordered_samples.last_flush) { |
| printf("Warning: Timestamp below last timeslice flush\n"); |
| return -EINVAL; |
| } |
| |
| if (!list_empty(sc)) { |
| new = list_entry(sc->next, struct sample_queue, list); |
| list_del(&new->list); |
| } else if (os->sample_buffer) { |
| new = os->sample_buffer + os->sample_buffer_idx; |
| if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) |
| os->sample_buffer = NULL; |
| } else { |
| os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); |
| if (!os->sample_buffer) |
| return -ENOMEM; |
| list_add(&os->sample_buffer->list, &os->to_free); |
| os->sample_buffer_idx = 2; |
| new = os->sample_buffer + 1; |
| } |
| |
| new->timestamp = timestamp; |
| new->file_offset = file_offset; |
| new->event = event; |
| |
| __queue_event(new, s); |
| |
| return 0; |
| } |
| |
| static void callchain__printf(struct perf_sample *sample) |
| { |
| unsigned int i; |
| |
| printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); |
| |
| for (i = 0; i < sample->callchain->nr; i++) |
| printf("..... %2d: %016" PRIx64 "\n", |
| i, sample->callchain->ips[i]); |
| } |
| |
| static void perf_session__print_tstamp(struct perf_session *session, |
| union perf_event *event, |
| struct perf_sample *sample) |
| { |
| if (event->header.type != PERF_RECORD_SAMPLE && |
| !session->sample_id_all) { |
| fputs("-1 -1 ", stdout); |
| return; |
| } |
| |
| if ((session->sample_type & PERF_SAMPLE_CPU)) |
| printf("%u ", sample->cpu); |
| |
| if (session->sample_type & PERF_SAMPLE_TIME) |
| printf("%" PRIu64 " ", sample->time); |
| } |
| |
| static void dump_event(struct perf_session *session, union perf_event *event, |
| u64 file_offset, struct perf_sample *sample) |
| { |
| if (!dump_trace) |
| return; |
| |
| printf("\n%#" PRIx64 " [%#x]: event: %d\n", |
| file_offset, event->header.size, event->header.type); |
| |
| trace_event(event); |
| |
| if (sample) |
| perf_session__print_tstamp(session, event, sample); |
| |
| printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, |
| event->header.size, perf_event__name(event->header.type)); |
| } |
| |
| static void dump_sample(struct perf_session *session, union perf_event *event, |
| struct perf_sample *sample) |
| { |
| if (!dump_trace) |
| return; |
| |
| printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n", |
| event->header.misc, sample->pid, sample->tid, sample->ip, |
| sample->period); |
| |
| if (session->sample_type & PERF_SAMPLE_CALLCHAIN) |
| callchain__printf(sample); |
| } |
| |
| static int perf_session_deliver_event(struct perf_session *session, |
| union perf_event *event, |
| struct perf_sample *sample, |
| struct perf_event_ops *ops, |
| u64 file_offset) |
| { |
| struct perf_evsel *evsel; |
| |
| dump_event(session, event, file_offset, sample); |
| |
| switch (event->header.type) { |
| case PERF_RECORD_SAMPLE: |
| dump_sample(session, event, sample); |
| evsel = perf_evlist__id2evsel(session->evlist, sample->id); |
| if (evsel == NULL) { |
| ++session->hists.stats.nr_unknown_id; |
| return -1; |
| } |
| return ops->sample(event, sample, evsel, session); |
| case PERF_RECORD_MMAP: |
| return ops->mmap(event, sample, session); |
| case PERF_RECORD_COMM: |
| return ops->comm(event, sample, session); |
| case PERF_RECORD_FORK: |
| return ops->fork(event, sample, session); |
| case PERF_RECORD_EXIT: |
| return ops->exit(event, sample, session); |
| case PERF_RECORD_LOST: |
| return ops->lost(event, sample, session); |
| case PERF_RECORD_READ: |
| return ops->read(event, sample, session); |
| case PERF_RECORD_THROTTLE: |
| return ops->throttle(event, sample, session); |
| case PERF_RECORD_UNTHROTTLE: |
| return ops->unthrottle(event, sample, session); |
| default: |
| ++session->hists.stats.nr_unknown_events; |
| return -1; |
| } |
| } |
| |
| static int perf_session__preprocess_sample(struct perf_session *session, |
| union perf_event *event, struct perf_sample *sample) |
| { |
| if (event->header.type != PERF_RECORD_SAMPLE || |
| !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) |
| return 0; |
| |
| if (!ip_callchain__valid(sample->callchain, event)) { |
| pr_debug("call-chain problem with event, skipping it.\n"); |
| ++session->hists.stats.nr_invalid_chains; |
| session->hists.stats.total_invalid_chains += sample->period; |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, |
| struct perf_event_ops *ops, u64 file_offset) |
| { |
| dump_event(session, event, file_offset, NULL); |
| |
| /* These events are processed right away */ |
| switch (event->header.type) { |
| case PERF_RECORD_HEADER_ATTR: |
| return ops->attr(event, session); |
| case PERF_RECORD_HEADER_EVENT_TYPE: |
| return ops->event_type(event, session); |
| case PERF_RECORD_HEADER_TRACING_DATA: |
| /* setup for reading amidst mmap */ |
| lseek(session->fd, file_offset, SEEK_SET); |
| return ops->tracing_data(event, session); |
| case PERF_RECORD_HEADER_BUILD_ID: |
| return ops->build_id(event, session); |
| case PERF_RECORD_FINISHED_ROUND: |
| return ops->finished_round(event, session, ops); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int perf_session__process_event(struct perf_session *session, |
| union perf_event *event, |
| struct perf_event_ops *ops, |
| u64 file_offset) |
| { |
| struct perf_sample sample; |
| int ret; |
| |
| if (session->header.needs_swap && |
| perf_event__swap_ops[event->header.type]) |
| perf_event__swap_ops[event->header.type](event); |
| |
| if (event->header.type >= PERF_RECORD_HEADER_MAX) |
| return -EINVAL; |
| |
| hists__inc_nr_events(&session->hists, event->header.type); |
| |
| if (event->header.type >= PERF_RECORD_USER_TYPE_START) |
| return perf_session__process_user_event(session, event, ops, file_offset); |
| |
| /* |
| * For all kernel events we get the sample data |
| */ |
| ret = perf_session__parse_sample(session, event, &sample); |
| if (ret) |
| return ret; |
| |
| /* Preprocess sample records - precheck callchains */ |
| if (perf_session__preprocess_sample(session, event, &sample)) |
| return 0; |
| |
| if (ops->ordered_samples) { |
| ret = perf_session_queue_event(session, event, &sample, |
| file_offset); |
| if (ret != -ETIME) |
| return ret; |
| } |
| |
| return perf_session_deliver_event(session, event, &sample, ops, |
| file_offset); |
| } |
| |
| void perf_event_header__bswap(struct perf_event_header *self) |
| { |
| self->type = bswap_32(self->type); |
| self->misc = bswap_16(self->misc); |
| self->size = bswap_16(self->size); |
| } |
| |
| static struct thread *perf_session__register_idle_thread(struct perf_session *self) |
| { |
| struct thread *thread = perf_session__findnew(self, 0); |
| |
| if (thread == NULL || thread__set_comm(thread, "swapper")) { |
| pr_err("problem inserting idle task.\n"); |
| thread = NULL; |
| } |
| |
| return thread; |
| } |
| |
| static void perf_session__warn_about_errors(const struct perf_session *session, |
| const struct perf_event_ops *ops) |
| { |
| if (ops->lost == perf_event__process_lost && |
| session->hists.stats.total_lost != 0) { |
| ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64 |
| "!\n\nCheck IO/CPU overload!\n\n", |
| session->hists.stats.total_period, |
| session->hists.stats.total_lost); |
| } |
| |
| if (session->hists.stats.nr_unknown_events != 0) { |
| ui__warning("Found %u unknown events!\n\n" |
| "Is this an older tool processing a perf.data " |
| "file generated by a more recent tool?\n\n" |
| "If that is not the case, consider " |
| "reporting to linux-kernel@vger.kernel.org.\n\n", |
| session->hists.stats.nr_unknown_events); |
| } |
| |
| if (session->hists.stats.nr_unknown_id != 0) { |
| ui__warning("%u samples with id not present in the header\n", |
| session->hists.stats.nr_unknown_id); |
| } |
| |
| if (session->hists.stats.nr_invalid_chains != 0) { |
| ui__warning("Found invalid callchains!\n\n" |
| "%u out of %u events were discarded for this reason.\n\n" |
| "Consider reporting to linux-kernel@vger.kernel.org.\n\n", |
| session->hists.stats.nr_invalid_chains, |
| session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); |
| } |
| } |
| |
| #define session_done() (*(volatile int *)(&session_done)) |
| volatile int session_done; |
| |
| static int __perf_session__process_pipe_events(struct perf_session *self, |
| struct perf_event_ops *ops) |
| { |
| union perf_event event; |
| uint32_t size; |
| int skip = 0; |
| u64 head; |
| int err; |
| void *p; |
| |
| perf_event_ops__fill_defaults(ops); |
| |
| head = 0; |
| more: |
| err = readn(self->fd, &event, sizeof(struct perf_event_header)); |
| if (err <= 0) { |
| if (err == 0) |
| goto done; |
| |
| pr_err("failed to read event header\n"); |
| goto out_err; |
| } |
| |
| if (self->header.needs_swap) |
| perf_event_header__bswap(&event.header); |
| |
| size = event.header.size; |
| if (size == 0) |
| size = 8; |
| |
| p = &event; |
| p += sizeof(struct perf_event_header); |
| |
| if (size - sizeof(struct perf_event_header)) { |
| err = readn(self->fd, p, size - sizeof(struct perf_event_header)); |
| if (err <= 0) { |
| if (err == 0) { |
| pr_err("unexpected end of event stream\n"); |
| goto done; |
| } |
| |
| pr_err("failed to read event data\n"); |
| goto out_err; |
| } |
| } |
| |
| if (size == 0 || |
| (skip = perf_session__process_event(self, &event, ops, head)) < 0) { |
| dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", |
| head, event.header.size, event.header.type); |
| /* |
| * assume we lost track of the stream, check alignment, and |
| * increment a single u64 in the hope to catch on again 'soon'. |
| */ |
| if (unlikely(head & 7)) |
| head &= ~7ULL; |
| |
| size = 8; |
| } |
| |
| head += size; |
| |
| if (skip > 0) |
| head += skip; |
| |
| if (!session_done()) |
| goto more; |
| done: |
| err = 0; |
| out_err: |
| perf_session__warn_about_errors(self, ops); |
| perf_session_free_sample_buffers(self); |
| return err; |
| } |
| |
| static union perf_event * |
| fetch_mmaped_event(struct perf_session *session, |
| u64 head, size_t mmap_size, char *buf) |
| { |
| union perf_event *event; |
| |
| /* |
| * Ensure we have enough space remaining to read |
| * the size of the event in the headers. |
| */ |
| if (head + sizeof(event->header) > mmap_size) |
| return NULL; |
| |
| event = (union perf_event *)(buf + head); |
| |
| if (session->header.needs_swap) |
| perf_event_header__bswap(&event->header); |
| |
| if (head + event->header.size > mmap_size) |
| return NULL; |
| |
| return event; |
| } |
| |
| int __perf_session__process_events(struct perf_session *session, |
| u64 data_offset, u64 data_size, |
| u64 file_size, struct perf_event_ops *ops) |
| { |
| u64 head, page_offset, file_offset, file_pos, progress_next; |
| int err, mmap_prot, mmap_flags, map_idx = 0; |
| struct ui_progress *progress; |
| size_t page_size, mmap_size; |
| char *buf, *mmaps[8]; |
| union perf_event *event; |
| uint32_t size; |
| |
| perf_event_ops__fill_defaults(ops); |
| |
| page_size = sysconf(_SC_PAGESIZE); |
| |
| page_offset = page_size * (data_offset / page_size); |
| file_offset = page_offset; |
| head = data_offset - page_offset; |
| |
| if (data_offset + data_size < file_size) |
| file_size = data_offset + data_size; |
| |
| progress_next = file_size / 16; |
| progress = ui_progress__new("Processing events...", file_size); |
| if (progress == NULL) |
| return -1; |
| |
| mmap_size = session->mmap_window; |
| if (mmap_size > file_size) |
| mmap_size = file_size; |
| |
| memset(mmaps, 0, sizeof(mmaps)); |
| |
| mmap_prot = PROT_READ; |
| mmap_flags = MAP_SHARED; |
| |
| if (session->header.needs_swap) { |
| mmap_prot |= PROT_WRITE; |
| mmap_flags = MAP_PRIVATE; |
| } |
| remap: |
| buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, |
| file_offset); |
| if (buf == MAP_FAILED) { |
| pr_err("failed to mmap file\n"); |
| err = -errno; |
| goto out_err; |
| } |
| mmaps[map_idx] = buf; |
| map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); |
| file_pos = file_offset + head; |
| |
| more: |
| event = fetch_mmaped_event(session, head, mmap_size, buf); |
| if (!event) { |
| if (mmaps[map_idx]) { |
| munmap(mmaps[map_idx], mmap_size); |
| mmaps[map_idx] = NULL; |
| } |
| |
| page_offset = page_size * (head / page_size); |
| file_offset += page_offset; |
| head -= page_offset; |
| goto remap; |
| } |
| |
| size = event->header.size; |
| |
| if (size == 0 || |
| perf_session__process_event(session, event, ops, file_pos) < 0) { |
| dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", |
| file_offset + head, event->header.size, |
| event->header.type); |
| /* |
| * assume we lost track of the stream, check alignment, and |
| * increment a single u64 in the hope to catch on again 'soon'. |
| */ |
| if (unlikely(head & 7)) |
| head &= ~7ULL; |
| |
| size = 8; |
| } |
| |
| head += size; |
| file_pos += size; |
| |
| if (file_pos >= progress_next) { |
| progress_next += file_size / 16; |
| ui_progress__update(progress, file_pos); |
| } |
| |
| if (file_pos < file_size) |
| goto more; |
| |
| err = 0; |
| /* do the final flush for ordered samples */ |
| session->ordered_samples.next_flush = ULLONG_MAX; |
| flush_sample_queue(session, ops); |
| out_err: |
| ui_progress__delete(progress); |
| perf_session__warn_about_errors(session, ops); |
| perf_session_free_sample_buffers(session); |
| return err; |
| } |
| |
| int perf_session__process_events(struct perf_session *self, |
| struct perf_event_ops *ops) |
| { |
| int err; |
| |
| if (perf_session__register_idle_thread(self) == NULL) |
| return -ENOMEM; |
| |
| if (!self->fd_pipe) |
| err = __perf_session__process_events(self, |
| self->header.data_offset, |
| self->header.data_size, |
| self->size, ops); |
| else |
| err = __perf_session__process_pipe_events(self, ops); |
| |
| return err; |
| } |
| |
| bool perf_session__has_traces(struct perf_session *self, const char *msg) |
| { |
| if (!(self->sample_type & PERF_SAMPLE_RAW)) { |
| pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, |
| const char *symbol_name, |
| u64 addr) |
| { |
| char *bracket; |
| enum map_type i; |
| struct ref_reloc_sym *ref; |
| |
| ref = zalloc(sizeof(struct ref_reloc_sym)); |
| if (ref == NULL) |
| return -ENOMEM; |
| |
| ref->name = strdup(symbol_name); |
| if (ref->name == NULL) { |
| free(ref); |
| return -ENOMEM; |
| } |
| |
| bracket = strchr(ref->name, ']'); |
| if (bracket) |
| *bracket = '\0'; |
| |
| ref->addr = addr; |
| |
| for (i = 0; i < MAP__NR_TYPES; ++i) { |
| struct kmap *kmap = map__kmap(maps[i]); |
| kmap->ref_reloc_sym = ref; |
| } |
| |
| return 0; |
| } |
| |
| size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) |
| { |
| return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + |
| __dsos__fprintf(&self->host_machine.user_dsos, fp) + |
| machines__fprintf_dsos(&self->machines, fp); |
| } |
| |
| size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, |
| bool with_hits) |
| { |
| size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); |
| return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); |
| } |
| |
| size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) |
| { |
| struct perf_evsel *pos; |
| size_t ret = fprintf(fp, "Aggregated stats:\n"); |
| |
| ret += hists__fprintf_nr_events(&session->hists, fp); |
| |
| list_for_each_entry(pos, &session->evlist->entries, node) { |
| ret += fprintf(fp, "%s stats:\n", event_name(pos)); |
| ret += hists__fprintf_nr_events(&pos->hists, fp); |
| } |
| |
| return ret; |
| } |
| |
| struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, |
| unsigned int type) |
| { |
| struct perf_evsel *pos; |
| |
| list_for_each_entry(pos, &session->evlist->entries, node) { |
| if (pos->attr.type == type) |
| return pos; |
| } |
| return NULL; |
| } |
| |
| void perf_session__print_symbols(union perf_event *event, |
| struct perf_sample *sample, |
| struct perf_session *session) |
| { |
| struct addr_location al; |
| const char *symname, *dsoname; |
| struct callchain_cursor *cursor = &session->callchain_cursor; |
| struct callchain_cursor_node *node; |
| |
| if (perf_event__preprocess_sample(event, session, &al, sample, |
| NULL) < 0) { |
| error("problem processing %d event, skipping it.\n", |
| event->header.type); |
| return; |
| } |
| |
| if (symbol_conf.use_callchain && sample->callchain) { |
| |
| if (perf_session__resolve_callchain(session, al.thread, |
| sample->callchain, NULL) != 0) { |
| if (verbose) |
| error("Failed to resolve callchain. Skipping\n"); |
| return; |
| } |
| callchain_cursor_commit(cursor); |
| |
| while (1) { |
| node = callchain_cursor_current(cursor); |
| if (!node) |
| break; |
| |
| if (node->sym && node->sym->name) |
| symname = node->sym->name; |
| else |
| symname = ""; |
| |
| if (node->map && node->map->dso && node->map->dso->name) |
| dsoname = node->map->dso->name; |
| else |
| dsoname = ""; |
| |
| printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname); |
| |
| callchain_cursor_advance(cursor); |
| } |
| |
| } else { |
| if (al.sym && al.sym->name) |
| symname = al.sym->name; |
| else |
| symname = ""; |
| |
| if (al.map && al.map->dso && al.map->dso->name) |
| dsoname = al.map->dso->name; |
| else |
| dsoname = ""; |
| |
| printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname); |
| } |
| } |