#define _FILE_OFFSET_BITS 64 #include #include #include #include #include #include "evlist.h" #include "evsel.h" #include "session.h" #include "tool.h" #include "sort.h" #include "util.h" #include "cpumap.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 (rerun with -v to learn more)"); 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 (rerun with -v to learn more)"); 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; } 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); self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist); self->host_machine.id_hdr_size = self->id_hdr_size; } 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_tool *tool) { struct perf_session *self; struct stat st; size_t len; if (!filename || !strlen(filename)) { if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode)) filename = "-"; else filename = "perf.data"; } len = strlen(filename); self = zalloc(sizeof(*self) + len); if (self == NULL) goto out; memcpy(self->filename, filename, len); /* * 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); hists__init(&self->hists); 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 (tool && tool->ordering_requires_timestamps && tool->ordered_samples && !self->sample_id_all) { dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); tool->ordered_samples = false; } out: return self; out_delete: perf_session__delete(self); return NULL; } static void machine__delete_dead_threads(struct machine *machine) { struct thread *n, *t; list_for_each_entry_safe(t, n, &machine->dead_threads, node) { list_del(&t->node); thread__delete(t); } } static void perf_session__delete_dead_threads(struct perf_session *session) { machine__delete_dead_threads(&session->host_machine); } static void machine__delete_threads(struct machine *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); } } static void perf_session__delete_threads(struct perf_session *session) { machine__delete_threads(&session->host_machine); } 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 machine__remove_thread(struct machine *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; } static const u8 cpumodes[] = { PERF_RECORD_MISC_USER, PERF_RECORD_MISC_KERNEL, PERF_RECORD_MISC_GUEST_USER, PERF_RECORD_MISC_GUEST_KERNEL }; #define NCPUMODES (sizeof(cpumodes)/sizeof(u8)) static void ip__resolve_ams(struct machine *self, struct thread *thread, struct addr_map_symbol *ams, u64 ip) { struct addr_location al; size_t i; u8 m; memset(&al, 0, sizeof(al)); for (i = 0; i < NCPUMODES; i++) { m = cpumodes[i]; /* * We cannot use the header.misc hint to determine whether a * branch stack address is user, kernel, guest, hypervisor. * Branches may straddle the kernel/user/hypervisor boundaries. * Thus, we have to try consecutively until we find a match * or else, the symbol is unknown */ thread__find_addr_location(thread, self, m, MAP__FUNCTION, ip, &al, NULL); if (al.sym) goto found; } found: ams->addr = ip; ams->al_addr = al.addr; ams->sym = al.sym; ams->map = al.map; } struct branch_info *machine__resolve_bstack(struct machine *self, struct thread *thr, struct branch_stack *bs) { struct branch_info *bi; unsigned int i; bi = calloc(bs->nr, sizeof(struct branch_info)); if (!bi) return NULL; for (i = 0; i < bs->nr; i++) { ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to); ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from); bi[i].flags = bs->entries[i].flags; } return bi; } int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel, struct thread *thread, struct ip_callchain *chain, struct symbol **parent) { u8 cpumode = PERF_RECORD_MISC_USER; unsigned int i; int err; callchain_cursor_reset(&evsel->hists.callchain_cursor); for (i = 0; i < chain->nr; i++) { u64 ip; struct addr_location al; if (callchain_param.order == ORDER_CALLEE) ip = chain->ips[i]; else ip = chain->ips[chain->nr - i - 1]; 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, 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(&evsel->hists.callchain_cursor, ip, al.map, al.sym); if (err) return err; } return 0; } static int process_event_synth_tracing_data_stub(union perf_event *event __used, struct perf_session *session __used) { dump_printf(": unhandled!\n"); return 0; } static int process_event_synth_attr_stub(union perf_event *event __used, struct perf_evlist **pevlist __used) { dump_printf(": unhandled!\n"); return 0; } static int process_event_sample_stub(struct perf_tool *tool __used, union perf_event *event __used, struct perf_sample *sample __used, struct perf_evsel *evsel __used, struct machine *machine __used) { dump_printf(": unhandled!\n"); return 0; } static int process_event_stub(struct perf_tool *tool __used, union perf_event *event __used, struct perf_sample *sample __used, struct machine *machine __used) { dump_printf(": unhandled!\n"); return 0; } static int process_finished_round_stub(struct perf_tool *tool __used, union perf_event *event __used, struct perf_session *perf_session __used) { dump_printf(": unhandled!\n"); return 0; } static int process_event_type_stub(struct perf_tool *tool __used, union perf_event *event __used) { dump_printf(": unhandled!\n"); return 0; } static int process_finished_round(struct perf_tool *tool, union perf_event *event, struct perf_session *session); static void perf_tool__fill_defaults(struct perf_tool *tool) { if (tool->sample == NULL) tool->sample = process_event_sample_stub; if (tool->mmap == NULL) tool->mmap = process_event_stub; if (tool->comm == NULL) tool->comm = process_event_stub; if (tool->fork == NULL) tool->fork = process_event_stub; if (tool->exit == NULL) tool->exit = process_event_stub; if (tool->lost == NULL) tool->lost = perf_event__process_lost; if (tool->read == NULL) tool->read = process_event_sample_stub; if (tool->throttle == NULL) tool->throttle = process_event_stub; if (tool->unthrottle == NULL) tool->unthrottle = process_event_stub; if (tool->attr == NULL) tool->attr = process_event_synth_attr_stub; if (tool->event_type == NULL) tool->event_type = process_event_type_stub; if (tool->tracing_data == NULL) tool->tracing_data = process_event_synth_tracing_data_stub; if (tool->build_id == NULL) tool->build_id = process_finished_round_stub; if (tool->finished_round == NULL) { if (tool->ordered_samples) tool->finished_round = process_finished_round; else tool->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); } static u8 revbyte(u8 b) { int rev = (b >> 4) | ((b & 0xf) << 4); rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2); rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1); return (u8) rev; } /* * XXX this is hack in attempt to carry flags bitfield * throught endian village. ABI says: * * Bit-fields are allocated from right to left (least to most significant) * on little-endian implementations and from left to right (most to least * significant) on big-endian implementations. * * The above seems to be byte specific, so we need to reverse each * byte of the bitfield. 'Internet' also says this might be implementation * specific and we probably need proper fix and carry perf_event_attr * bitfield flags in separate data file FEAT_ section. Thought this seems * to work for now. */ static void swap_bitfield(u8 *p, unsigned len) { unsigned i; for (i = 0; i < len; i++) { *p = revbyte(*p); p++; } } /* 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); swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64)); } 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_tool *tool, u64 file_offset); static void flush_sample_queue(struct perf_session *s, struct perf_tool *tool) { 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; unsigned idx = 0, progress_next = os->nr_samples / 16; int ret; if (!tool->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, tool, iter->file_offset); os->last_flush = iter->timestamp; list_del(&iter->list); list_add(&iter->list, &os->sample_cache); if (++idx >= progress_next) { progress_next += os->nr_samples / 16; ui_progress__update(idx, os->nr_samples, "Processing time ordered events..."); } } if (list_empty(head)) { os->last_sample = NULL; } else if (last_ts <= limit) { os->last_sample = list_entry(head->prev, struct sample_queue, list); } os->nr_samples = 0; } /* * 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(struct perf_tool *tool, union perf_event *event __used, struct perf_session *session) { flush_sample_queue(session, tool); 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->nr_samples; 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 branch_stack__printf(struct perf_sample *sample) { uint64_t i; printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr); for (i = 0; i < sample->branch_stack->nr; i++) printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n", i, sample->branch_stack->entries[i].from, sample->branch_stack->entries[i].to); } 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 " addr: %#" PRIx64 "\n", event->header.misc, sample->pid, sample->tid, sample->ip, sample->period, sample->addr); if (session->sample_type & PERF_SAMPLE_CALLCHAIN) callchain__printf(sample); if (session->sample_type & PERF_SAMPLE_BRANCH_STACK) branch_stack__printf(sample); } static struct machine * perf_session__find_machine_for_cpumode(struct perf_session *session, union perf_event *event) { const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) { u32 pid; if (event->header.type == PERF_RECORD_MMAP) pid = event->mmap.pid; else pid = event->ip.pid; return perf_session__find_machine(session, pid); } return perf_session__find_host_machine(session); } static int perf_session_deliver_event(struct perf_session *session, union perf_event *event, struct perf_sample *sample, struct perf_tool *tool, u64 file_offset) { struct perf_evsel *evsel; struct machine *machine; dump_event(session, event, file_offset, sample); evsel = perf_evlist__id2evsel(session->evlist, sample->id); if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { /* * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here * because the tools right now may apply filters, discarding * some of the samples. For consistency, in the future we * should have something like nr_filtered_samples and remove * the sample->period from total_sample_period, etc, KISS for * now tho. * * Also testing against NULL allows us to handle files without * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the * future probably it'll be a good idea to restrict event * processing via perf_session to files with both set. */ hists__inc_nr_events(&evsel->hists, event->header.type); } machine = perf_session__find_machine_for_cpumode(session, event); switch (event->header.type) { case PERF_RECORD_SAMPLE: dump_sample(session, event, sample); if (evsel == NULL) { ++session->hists.stats.nr_unknown_id; return 0; } if (machine == NULL) { ++session->hists.stats.nr_unprocessable_samples; return 0; } return tool->sample(tool, event, sample, evsel, machine); case PERF_RECORD_MMAP: return tool->mmap(tool, event, sample, machine); case PERF_RECORD_COMM: return tool->comm(tool, event, sample, machine); case PERF_RECORD_FORK: return tool->fork(tool, event, sample, machine); case PERF_RECORD_EXIT: return tool->exit(tool, event, sample, machine); case PERF_RECORD_LOST: if (tool->lost == perf_event__process_lost) session->hists.stats.total_lost += event->lost.lost; return tool->lost(tool, event, sample, machine); case PERF_RECORD_READ: return tool->read(tool, event, sample, evsel, machine); case PERF_RECORD_THROTTLE: return tool->throttle(tool, event, sample, machine); case PERF_RECORD_UNTHROTTLE: return tool->unthrottle(tool, event, sample, machine); 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_tool *tool, u64 file_offset) { int err; dump_event(session, event, file_offset, NULL); /* These events are processed right away */ switch (event->header.type) { case PERF_RECORD_HEADER_ATTR: err = tool->attr(event, &session->evlist); if (err == 0) perf_session__update_sample_type(session); return err; case PERF_RECORD_HEADER_EVENT_TYPE: return tool->event_type(tool, event); case PERF_RECORD_HEADER_TRACING_DATA: /* setup for reading amidst mmap */ lseek(session->fd, file_offset, SEEK_SET); return tool->tracing_data(event, session); case PERF_RECORD_HEADER_BUILD_ID: return tool->build_id(tool, event, session); case PERF_RECORD_FINISHED_ROUND: return tool->finished_round(tool, event, session); default: return -EINVAL; } } static int perf_session__process_event(struct perf_session *session, union perf_event *event, struct perf_tool *tool, 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, tool, 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 (tool->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, tool, 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); } struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) { return machine__findnew_thread(&session->host_machine, pid); } 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_tool *tool) { if (tool->lost == perf_event__process_lost && session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { ui__warning("Processed %d events and lost %d chunks!\n\n" "Check IO/CPU overload!\n\n", session->hists.stats.nr_events[0], session->hists.stats.nr_events[PERF_RECORD_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]); } if (session->hists.stats.nr_unprocessable_samples != 0) { ui__warning("%u unprocessable samples recorded.\n" "Do you have a KVM guest running and not using 'perf kvm'?\n", session->hists.stats.nr_unprocessable_samples); } } #define session_done() (*(volatile int *)(&session_done)) volatile int session_done; static int __perf_session__process_pipe_events(struct perf_session *self, struct perf_tool *tool) { union perf_event *event; uint32_t size, cur_size = 0; void *buf = NULL; int skip = 0; u64 head; int err; void *p; perf_tool__fill_defaults(tool); head = 0; cur_size = sizeof(union perf_event); buf = malloc(cur_size); if (!buf) return -errno; more: event = buf; 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; if (size > cur_size) { void *new = realloc(buf, size); if (!new) { pr_err("failed to allocate memory to read event\n"); goto out_err; } buf = new; cur_size = size; event = buf; } 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 ((skip = perf_session__process_event(self, event, tool, head)) < 0) { pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n", head, event->header.size, event->header.type); err = -EINVAL; goto out_err; } head += size; if (skip > 0) head += skip; if (!session_done()) goto more; done: err = 0; out_err: free(buf); perf_session__warn_about_errors(self, tool); 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_tool *tool) { u64 head, page_offset, file_offset, file_pos, progress_next; int err, mmap_prot, mmap_flags, map_idx = 0; size_t page_size, mmap_size; char *buf, *mmaps[8]; union perf_event *event; uint32_t size; perf_tool__fill_defaults(tool); 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; 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, tool, file_pos) < 0) { pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n", file_offset + head, event->header.size, event->header.type); err = -EINVAL; goto out_err; } head += size; file_pos += size; if (file_pos >= progress_next) { progress_next += file_size / 16; ui_progress__update(file_pos, file_size, "Processing events..."); } 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, tool); out_err: perf_session__warn_about_errors(session, tool); perf_session_free_sample_buffers(session); return err; } int perf_session__process_events(struct perf_session *self, struct perf_tool *tool) { 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, tool); else err = __perf_session__process_pipe_events(self, tool); 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 maps__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; } size_t perf_session__fprintf(struct perf_session *session, FILE *fp) { /* * FIXME: Here we have to actually print all the machines in this * session, not just the host... */ return machine__fprintf(&session->host_machine, fp); } void perf_session__remove_thread(struct perf_session *session, struct thread *th) { /* * FIXME: This one makes no sense, we need to remove the thread from * the machine it belongs to, perf_session can have many machines, so * doing it always on ->host_machine is wrong. Fix when auditing all * the 'perf kvm' code. */ machine__remove_thread(&session->host_machine, th); } 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_event__print_ip(union perf_event *event, struct perf_sample *sample, struct machine *machine, struct perf_evsel *evsel, int print_sym, int print_dso, int print_symoffset) { struct addr_location al; struct callchain_cursor *cursor = &evsel->hists.callchain_cursor; struct callchain_cursor_node *node; if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) { error("problem processing %d event, skipping it.\n", event->header.type); return; } if (symbol_conf.use_callchain && sample->callchain) { if (machine__resolve_callchain(machine, evsel, 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; printf("\t%16" PRIx64, node->ip); if (print_sym) { printf(" "); symbol__fprintf_symname(node->sym, stdout); } if (print_dso) { printf(" ("); map__fprintf_dsoname(node->map, stdout); printf(")"); } printf("\n"); callchain_cursor_advance(cursor); } } else { printf("%16" PRIx64, sample->ip); if (print_sym) { printf(" "); if (print_symoffset) symbol__fprintf_symname_offs(al.sym, &al, stdout); else symbol__fprintf_symname(al.sym, stdout); } if (print_dso) { printf(" ("); map__fprintf_dsoname(al.map, stdout); printf(")"); } } } int perf_session__cpu_bitmap(struct perf_session *session, const char *cpu_list, unsigned long *cpu_bitmap) { int i; struct cpu_map *map; for (i = 0; i < PERF_TYPE_MAX; ++i) { struct perf_evsel *evsel; evsel = perf_session__find_first_evtype(session, i); if (!evsel) continue; if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { pr_err("File does not contain CPU events. " "Remove -c option to proceed.\n"); return -1; } } map = cpu_map__new(cpu_list); if (map == NULL) { pr_err("Invalid cpu_list\n"); return -1; } for (i = 0; i < map->nr; i++) { int cpu = map->map[i]; if (cpu >= MAX_NR_CPUS) { pr_err("Requested CPU %d too large. " "Consider raising MAX_NR_CPUS\n", cpu); return -1; } set_bit(cpu, cpu_bitmap); } return 0; } void perf_session__fprintf_info(struct perf_session *session, FILE *fp, bool full) { struct stat st; int ret; if (session == NULL || fp == NULL) return; ret = fstat(session->fd, &st); if (ret == -1) return; fprintf(fp, "# ========\n"); fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); perf_header__fprintf_info(session, fp, full); fprintf(fp, "# ========\n#\n"); }