| /* |
| * builtin-record.c |
| * |
| * Builtin record command: Record the profile of a workload |
| * (or a CPU, or a PID) into the perf.data output file - for |
| * later analysis via perf report. |
| */ |
| #include "builtin.h" |
| |
| #include "perf.h" |
| |
| #include "util/build-id.h" |
| #include "util/util.h" |
| #include <subcmd/parse-options.h> |
| #include "util/parse-events.h" |
| #include "util/config.h" |
| |
| #include "util/callchain.h" |
| #include "util/cgroup.h" |
| #include "util/header.h" |
| #include "util/event.h" |
| #include "util/evlist.h" |
| #include "util/evsel.h" |
| #include "util/debug.h" |
| #include "util/drv_configs.h" |
| #include "util/session.h" |
| #include "util/tool.h" |
| #include "util/symbol.h" |
| #include "util/cpumap.h" |
| #include "util/thread_map.h" |
| #include "util/data.h" |
| #include "util/perf_regs.h" |
| #include "util/auxtrace.h" |
| #include "util/tsc.h" |
| #include "util/parse-branch-options.h" |
| #include "util/parse-regs-options.h" |
| #include "util/llvm-utils.h" |
| #include "util/bpf-loader.h" |
| #include "util/trigger.h" |
| #include "util/perf-hooks.h" |
| #include "asm/bug.h" |
| |
| #include <inttypes.h> |
| #include <unistd.h> |
| #include <sched.h> |
| #include <sys/mman.h> |
| #include <asm/bug.h> |
| #include <linux/time64.h> |
| |
| struct switch_output { |
| bool enabled; |
| bool signal; |
| unsigned long size; |
| unsigned long time; |
| const char *str; |
| bool set; |
| }; |
| |
| struct record { |
| struct perf_tool tool; |
| struct record_opts opts; |
| u64 bytes_written; |
| struct perf_data_file file; |
| struct auxtrace_record *itr; |
| struct perf_evlist *evlist; |
| struct perf_session *session; |
| const char *progname; |
| int realtime_prio; |
| bool no_buildid; |
| bool no_buildid_set; |
| bool no_buildid_cache; |
| bool no_buildid_cache_set; |
| bool buildid_all; |
| bool timestamp_filename; |
| struct switch_output switch_output; |
| unsigned long long samples; |
| }; |
| |
| static volatile int auxtrace_record__snapshot_started; |
| static DEFINE_TRIGGER(auxtrace_snapshot_trigger); |
| static DEFINE_TRIGGER(switch_output_trigger); |
| |
| static bool switch_output_signal(struct record *rec) |
| { |
| return rec->switch_output.signal && |
| trigger_is_ready(&switch_output_trigger); |
| } |
| |
| static bool switch_output_size(struct record *rec) |
| { |
| return rec->switch_output.size && |
| trigger_is_ready(&switch_output_trigger) && |
| (rec->bytes_written >= rec->switch_output.size); |
| } |
| |
| static bool switch_output_time(struct record *rec) |
| { |
| return rec->switch_output.time && |
| trigger_is_ready(&switch_output_trigger); |
| } |
| |
| static int record__write(struct record *rec, void *bf, size_t size) |
| { |
| if (perf_data_file__write(rec->session->file, bf, size) < 0) { |
| pr_err("failed to write perf data, error: %m\n"); |
| return -1; |
| } |
| |
| rec->bytes_written += size; |
| |
| if (switch_output_size(rec)) |
| trigger_hit(&switch_output_trigger); |
| |
| return 0; |
| } |
| |
| static int process_synthesized_event(struct perf_tool *tool, |
| union perf_event *event, |
| struct perf_sample *sample __maybe_unused, |
| struct machine *machine __maybe_unused) |
| { |
| struct record *rec = container_of(tool, struct record, tool); |
| return record__write(rec, event, event->header.size); |
| } |
| |
| static int |
| backward_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end) |
| { |
| struct perf_event_header *pheader; |
| u64 evt_head = head; |
| int size = mask + 1; |
| |
| pr_debug2("backward_rb_find_range: buf=%p, head=%"PRIx64"\n", buf, head); |
| pheader = (struct perf_event_header *)(buf + (head & mask)); |
| *start = head; |
| while (true) { |
| if (evt_head - head >= (unsigned int)size) { |
| pr_debug("Finished reading backward ring buffer: rewind\n"); |
| if (evt_head - head > (unsigned int)size) |
| evt_head -= pheader->size; |
| *end = evt_head; |
| return 0; |
| } |
| |
| pheader = (struct perf_event_header *)(buf + (evt_head & mask)); |
| |
| if (pheader->size == 0) { |
| pr_debug("Finished reading backward ring buffer: get start\n"); |
| *end = evt_head; |
| return 0; |
| } |
| |
| evt_head += pheader->size; |
| pr_debug3("move evt_head: %"PRIx64"\n", evt_head); |
| } |
| WARN_ONCE(1, "Shouldn't get here\n"); |
| return -1; |
| } |
| |
| static int |
| rb_find_range(void *data, int mask, u64 head, u64 old, |
| u64 *start, u64 *end, bool backward) |
| { |
| if (!backward) { |
| *start = old; |
| *end = head; |
| return 0; |
| } |
| |
| return backward_rb_find_range(data, mask, head, start, end); |
| } |
| |
| static int |
| record__mmap_read(struct record *rec, struct perf_mmap *md, |
| bool overwrite, bool backward) |
| { |
| u64 head = perf_mmap__read_head(md); |
| u64 old = md->prev; |
| u64 end = head, start = old; |
| unsigned char *data = md->base + page_size; |
| unsigned long size; |
| void *buf; |
| int rc = 0; |
| |
| if (rb_find_range(data, md->mask, head, |
| old, &start, &end, backward)) |
| return -1; |
| |
| if (start == end) |
| return 0; |
| |
| rec->samples++; |
| |
| size = end - start; |
| if (size > (unsigned long)(md->mask) + 1) { |
| WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n"); |
| |
| md->prev = head; |
| perf_mmap__consume(md, overwrite || backward); |
| return 0; |
| } |
| |
| if ((start & md->mask) + size != (end & md->mask)) { |
| buf = &data[start & md->mask]; |
| size = md->mask + 1 - (start & md->mask); |
| start += size; |
| |
| if (record__write(rec, buf, size) < 0) { |
| rc = -1; |
| goto out; |
| } |
| } |
| |
| buf = &data[start & md->mask]; |
| size = end - start; |
| start += size; |
| |
| if (record__write(rec, buf, size) < 0) { |
| rc = -1; |
| goto out; |
| } |
| |
| md->prev = head; |
| perf_mmap__consume(md, overwrite || backward); |
| out: |
| return rc; |
| } |
| |
| static volatile int done; |
| static volatile int signr = -1; |
| static volatile int child_finished; |
| |
| static void sig_handler(int sig) |
| { |
| if (sig == SIGCHLD) |
| child_finished = 1; |
| else |
| signr = sig; |
| |
| done = 1; |
| } |
| |
| static void sigsegv_handler(int sig) |
| { |
| perf_hooks__recover(); |
| sighandler_dump_stack(sig); |
| } |
| |
| static void record__sig_exit(void) |
| { |
| if (signr == -1) |
| return; |
| |
| signal(signr, SIG_DFL); |
| raise(signr); |
| } |
| |
| #ifdef HAVE_AUXTRACE_SUPPORT |
| |
| static int record__process_auxtrace(struct perf_tool *tool, |
| union perf_event *event, void *data1, |
| size_t len1, void *data2, size_t len2) |
| { |
| struct record *rec = container_of(tool, struct record, tool); |
| struct perf_data_file *file = &rec->file; |
| size_t padding; |
| u8 pad[8] = {0}; |
| |
| if (!perf_data_file__is_pipe(file)) { |
| off_t file_offset; |
| int fd = perf_data_file__fd(file); |
| int err; |
| |
| file_offset = lseek(fd, 0, SEEK_CUR); |
| if (file_offset == -1) |
| return -1; |
| err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index, |
| event, file_offset); |
| if (err) |
| return err; |
| } |
| |
| /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */ |
| padding = (len1 + len2) & 7; |
| if (padding) |
| padding = 8 - padding; |
| |
| record__write(rec, event, event->header.size); |
| record__write(rec, data1, len1); |
| if (len2) |
| record__write(rec, data2, len2); |
| record__write(rec, &pad, padding); |
| |
| return 0; |
| } |
| |
| static int record__auxtrace_mmap_read(struct record *rec, |
| struct auxtrace_mmap *mm) |
| { |
| int ret; |
| |
| ret = auxtrace_mmap__read(mm, rec->itr, &rec->tool, |
| record__process_auxtrace); |
| if (ret < 0) |
| return ret; |
| |
| if (ret) |
| rec->samples++; |
| |
| return 0; |
| } |
| |
| static int record__auxtrace_mmap_read_snapshot(struct record *rec, |
| struct auxtrace_mmap *mm) |
| { |
| int ret; |
| |
| ret = auxtrace_mmap__read_snapshot(mm, rec->itr, &rec->tool, |
| record__process_auxtrace, |
| rec->opts.auxtrace_snapshot_size); |
| if (ret < 0) |
| return ret; |
| |
| if (ret) |
| rec->samples++; |
| |
| return 0; |
| } |
| |
| static int record__auxtrace_read_snapshot_all(struct record *rec) |
| { |
| int i; |
| int rc = 0; |
| |
| for (i = 0; i < rec->evlist->nr_mmaps; i++) { |
| struct auxtrace_mmap *mm = |
| &rec->evlist->mmap[i].auxtrace_mmap; |
| |
| if (!mm->base) |
| continue; |
| |
| if (record__auxtrace_mmap_read_snapshot(rec, mm) != 0) { |
| rc = -1; |
| goto out; |
| } |
| } |
| out: |
| return rc; |
| } |
| |
| static void record__read_auxtrace_snapshot(struct record *rec) |
| { |
| pr_debug("Recording AUX area tracing snapshot\n"); |
| if (record__auxtrace_read_snapshot_all(rec) < 0) { |
| trigger_error(&auxtrace_snapshot_trigger); |
| } else { |
| if (auxtrace_record__snapshot_finish(rec->itr)) |
| trigger_error(&auxtrace_snapshot_trigger); |
| else |
| trigger_ready(&auxtrace_snapshot_trigger); |
| } |
| } |
| |
| #else |
| |
| static inline |
| int record__auxtrace_mmap_read(struct record *rec __maybe_unused, |
| struct auxtrace_mmap *mm __maybe_unused) |
| { |
| return 0; |
| } |
| |
| static inline |
| void record__read_auxtrace_snapshot(struct record *rec __maybe_unused) |
| { |
| } |
| |
| static inline |
| int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) |
| { |
| return 0; |
| } |
| |
| #endif |
| |
| static int record__mmap_evlist(struct record *rec, |
| struct perf_evlist *evlist) |
| { |
| struct record_opts *opts = &rec->opts; |
| char msg[512]; |
| |
| if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false, |
| opts->auxtrace_mmap_pages, |
| opts->auxtrace_snapshot_mode) < 0) { |
| if (errno == EPERM) { |
| pr_err("Permission error mapping pages.\n" |
| "Consider increasing " |
| "/proc/sys/kernel/perf_event_mlock_kb,\n" |
| "or try again with a smaller value of -m/--mmap_pages.\n" |
| "(current value: %u,%u)\n", |
| opts->mmap_pages, opts->auxtrace_mmap_pages); |
| return -errno; |
| } else { |
| pr_err("failed to mmap with %d (%s)\n", errno, |
| str_error_r(errno, msg, sizeof(msg))); |
| if (errno) |
| return -errno; |
| else |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static int record__mmap(struct record *rec) |
| { |
| return record__mmap_evlist(rec, rec->evlist); |
| } |
| |
| static int record__open(struct record *rec) |
| { |
| char msg[BUFSIZ]; |
| struct perf_evsel *pos; |
| struct perf_evlist *evlist = rec->evlist; |
| struct perf_session *session = rec->session; |
| struct record_opts *opts = &rec->opts; |
| struct perf_evsel_config_term *err_term; |
| int rc = 0; |
| |
| perf_evlist__config(evlist, opts, &callchain_param); |
| |
| evlist__for_each_entry(evlist, pos) { |
| try_again: |
| if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) { |
| if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) { |
| if (verbose > 0) |
| ui__warning("%s\n", msg); |
| goto try_again; |
| } |
| |
| rc = -errno; |
| perf_evsel__open_strerror(pos, &opts->target, |
| errno, msg, sizeof(msg)); |
| ui__error("%s\n", msg); |
| goto out; |
| } |
| } |
| |
| if (perf_evlist__apply_filters(evlist, &pos)) { |
| error("failed to set filter \"%s\" on event %s with %d (%s)\n", |
| pos->filter, perf_evsel__name(pos), errno, |
| str_error_r(errno, msg, sizeof(msg))); |
| rc = -1; |
| goto out; |
| } |
| |
| if (perf_evlist__apply_drv_configs(evlist, &pos, &err_term)) { |
| error("failed to set config \"%s\" on event %s with %d (%s)\n", |
| err_term->val.drv_cfg, perf_evsel__name(pos), errno, |
| str_error_r(errno, msg, sizeof(msg))); |
| rc = -1; |
| goto out; |
| } |
| |
| rc = record__mmap(rec); |
| if (rc) |
| goto out; |
| |
| session->evlist = evlist; |
| perf_session__set_id_hdr_size(session); |
| out: |
| return rc; |
| } |
| |
| static int process_sample_event(struct perf_tool *tool, |
| union perf_event *event, |
| struct perf_sample *sample, |
| struct perf_evsel *evsel, |
| struct machine *machine) |
| { |
| struct record *rec = container_of(tool, struct record, tool); |
| |
| rec->samples++; |
| |
| return build_id__mark_dso_hit(tool, event, sample, evsel, machine); |
| } |
| |
| static int process_buildids(struct record *rec) |
| { |
| struct perf_data_file *file = &rec->file; |
| struct perf_session *session = rec->session; |
| |
| if (file->size == 0) |
| return 0; |
| |
| /* |
| * During this process, it'll load kernel map and replace the |
| * dso->long_name to a real pathname it found. In this case |
| * we prefer the vmlinux path like |
| * /lib/modules/3.16.4/build/vmlinux |
| * |
| * rather than build-id path (in debug directory). |
| * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 |
| */ |
| symbol_conf.ignore_vmlinux_buildid = true; |
| |
| /* |
| * If --buildid-all is given, it marks all DSO regardless of hits, |
| * so no need to process samples. |
| */ |
| if (rec->buildid_all) |
| rec->tool.sample = NULL; |
| |
| return perf_session__process_events(session); |
| } |
| |
| static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
| { |
| int err; |
| struct perf_tool *tool = data; |
| /* |
| *As for guest kernel when processing subcommand record&report, |
| *we arrange module mmap prior to guest kernel mmap and trigger |
| *a preload dso because default guest module symbols are loaded |
| *from guest kallsyms instead of /lib/modules/XXX/XXX. This |
| *method is used to avoid symbol missing when the first addr is |
| *in module instead of in guest kernel. |
| */ |
| err = perf_event__synthesize_modules(tool, process_synthesized_event, |
| machine); |
| if (err < 0) |
| pr_err("Couldn't record guest kernel [%d]'s reference" |
| " relocation symbol.\n", machine->pid); |
| |
| /* |
| * We use _stext for guest kernel because guest kernel's /proc/kallsyms |
| * have no _text sometimes. |
| */ |
| err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
| machine); |
| if (err < 0) |
| pr_err("Couldn't record guest kernel [%d]'s reference" |
| " relocation symbol.\n", machine->pid); |
| } |
| |
| static struct perf_event_header finished_round_event = { |
| .size = sizeof(struct perf_event_header), |
| .type = PERF_RECORD_FINISHED_ROUND, |
| }; |
| |
| static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist, |
| bool backward) |
| { |
| u64 bytes_written = rec->bytes_written; |
| int i; |
| int rc = 0; |
| struct perf_mmap *maps; |
| |
| if (!evlist) |
| return 0; |
| |
| maps = backward ? evlist->backward_mmap : evlist->mmap; |
| if (!maps) |
| return 0; |
| |
| if (backward && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING) |
| return 0; |
| |
| for (i = 0; i < evlist->nr_mmaps; i++) { |
| struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap; |
| |
| if (maps[i].base) { |
| if (record__mmap_read(rec, &maps[i], |
| evlist->overwrite, backward) != 0) { |
| rc = -1; |
| goto out; |
| } |
| } |
| |
| if (mm->base && !rec->opts.auxtrace_snapshot_mode && |
| record__auxtrace_mmap_read(rec, mm) != 0) { |
| rc = -1; |
| goto out; |
| } |
| } |
| |
| /* |
| * Mark the round finished in case we wrote |
| * at least one event. |
| */ |
| if (bytes_written != rec->bytes_written) |
| rc = record__write(rec, &finished_round_event, sizeof(finished_round_event)); |
| |
| if (backward) |
| perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); |
| out: |
| return rc; |
| } |
| |
| static int record__mmap_read_all(struct record *rec) |
| { |
| int err; |
| |
| err = record__mmap_read_evlist(rec, rec->evlist, false); |
| if (err) |
| return err; |
| |
| return record__mmap_read_evlist(rec, rec->evlist, true); |
| } |
| |
| static void record__init_features(struct record *rec) |
| { |
| struct perf_session *session = rec->session; |
| int feat; |
| |
| for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++) |
| perf_header__set_feat(&session->header, feat); |
| |
| if (rec->no_buildid) |
| perf_header__clear_feat(&session->header, HEADER_BUILD_ID); |
| |
| if (!have_tracepoints(&rec->evlist->entries)) |
| perf_header__clear_feat(&session->header, HEADER_TRACING_DATA); |
| |
| if (!rec->opts.branch_stack) |
| perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK); |
| |
| if (!rec->opts.full_auxtrace) |
| perf_header__clear_feat(&session->header, HEADER_AUXTRACE); |
| |
| perf_header__clear_feat(&session->header, HEADER_STAT); |
| } |
| |
| static void |
| record__finish_output(struct record *rec) |
| { |
| struct perf_data_file *file = &rec->file; |
| int fd = perf_data_file__fd(file); |
| |
| if (file->is_pipe) |
| return; |
| |
| rec->session->header.data_size += rec->bytes_written; |
| file->size = lseek(perf_data_file__fd(file), 0, SEEK_CUR); |
| |
| if (!rec->no_buildid) { |
| process_buildids(rec); |
| |
| if (rec->buildid_all) |
| dsos__hit_all(rec->session); |
| } |
| perf_session__write_header(rec->session, rec->evlist, fd, true); |
| |
| return; |
| } |
| |
| static int record__synthesize_workload(struct record *rec, bool tail) |
| { |
| int err; |
| struct thread_map *thread_map; |
| |
| if (rec->opts.tail_synthesize != tail) |
| return 0; |
| |
| thread_map = thread_map__new_by_tid(rec->evlist->workload.pid); |
| if (thread_map == NULL) |
| return -1; |
| |
| err = perf_event__synthesize_thread_map(&rec->tool, thread_map, |
| process_synthesized_event, |
| &rec->session->machines.host, |
| rec->opts.sample_address, |
| rec->opts.proc_map_timeout); |
| thread_map__put(thread_map); |
| return err; |
| } |
| |
| static int record__synthesize(struct record *rec, bool tail); |
| |
| static int |
| record__switch_output(struct record *rec, bool at_exit) |
| { |
| struct perf_data_file *file = &rec->file; |
| int fd, err; |
| |
| /* Same Size: "2015122520103046"*/ |
| char timestamp[] = "InvalidTimestamp"; |
| |
| record__synthesize(rec, true); |
| if (target__none(&rec->opts.target)) |
| record__synthesize_workload(rec, true); |
| |
| rec->samples = 0; |
| record__finish_output(rec); |
| err = fetch_current_timestamp(timestamp, sizeof(timestamp)); |
| if (err) { |
| pr_err("Failed to get current timestamp\n"); |
| return -EINVAL; |
| } |
| |
| fd = perf_data_file__switch(file, timestamp, |
| rec->session->header.data_offset, |
| at_exit); |
| if (fd >= 0 && !at_exit) { |
| rec->bytes_written = 0; |
| rec->session->header.data_size = 0; |
| } |
| |
| if (!quiet) |
| fprintf(stderr, "[ perf record: Dump %s.%s ]\n", |
| file->path, timestamp); |
| |
| /* Output tracking events */ |
| if (!at_exit) { |
| record__synthesize(rec, false); |
| |
| /* |
| * In 'perf record --switch-output' without -a, |
| * record__synthesize() in record__switch_output() won't |
| * generate tracking events because there's no thread_map |
| * in evlist. Which causes newly created perf.data doesn't |
| * contain map and comm information. |
| * Create a fake thread_map and directly call |
| * perf_event__synthesize_thread_map() for those events. |
| */ |
| if (target__none(&rec->opts.target)) |
| record__synthesize_workload(rec, false); |
| } |
| return fd; |
| } |
| |
| static volatile int workload_exec_errno; |
| |
| /* |
| * perf_evlist__prepare_workload will send a SIGUSR1 |
| * if the fork fails, since we asked by setting its |
| * want_signal to true. |
| */ |
| static void workload_exec_failed_signal(int signo __maybe_unused, |
| siginfo_t *info, |
| void *ucontext __maybe_unused) |
| { |
| workload_exec_errno = info->si_value.sival_int; |
| done = 1; |
| child_finished = 1; |
| } |
| |
| static void snapshot_sig_handler(int sig); |
| static void alarm_sig_handler(int sig); |
| |
| int __weak |
| perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused, |
| struct perf_tool *tool __maybe_unused, |
| perf_event__handler_t process __maybe_unused, |
| struct machine *machine __maybe_unused) |
| { |
| return 0; |
| } |
| |
| static const struct perf_event_mmap_page * |
| perf_evlist__pick_pc(struct perf_evlist *evlist) |
| { |
| if (evlist) { |
| if (evlist->mmap && evlist->mmap[0].base) |
| return evlist->mmap[0].base; |
| if (evlist->backward_mmap && evlist->backward_mmap[0].base) |
| return evlist->backward_mmap[0].base; |
| } |
| return NULL; |
| } |
| |
| static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) |
| { |
| const struct perf_event_mmap_page *pc; |
| |
| pc = perf_evlist__pick_pc(rec->evlist); |
| if (pc) |
| return pc; |
| return NULL; |
| } |
| |
| static int record__synthesize(struct record *rec, bool tail) |
| { |
| struct perf_session *session = rec->session; |
| struct machine *machine = &session->machines.host; |
| struct perf_data_file *file = &rec->file; |
| struct record_opts *opts = &rec->opts; |
| struct perf_tool *tool = &rec->tool; |
| int fd = perf_data_file__fd(file); |
| int err = 0; |
| |
| if (rec->opts.tail_synthesize != tail) |
| return 0; |
| |
| if (file->is_pipe) { |
| err = perf_event__synthesize_attrs(tool, session, |
| process_synthesized_event); |
| if (err < 0) { |
| pr_err("Couldn't synthesize attrs.\n"); |
| goto out; |
| } |
| |
| if (have_tracepoints(&rec->evlist->entries)) { |
| /* |
| * FIXME err <= 0 here actually means that |
| * there were no tracepoints so its not really |
| * an error, just that we don't need to |
| * synthesize anything. We really have to |
| * return this more properly and also |
| * propagate errors that now are calling die() |
| */ |
| err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist, |
| process_synthesized_event); |
| if (err <= 0) { |
| pr_err("Couldn't record tracing data.\n"); |
| goto out; |
| } |
| rec->bytes_written += err; |
| } |
| } |
| |
| err = perf_event__synth_time_conv(record__pick_pc(rec), tool, |
| process_synthesized_event, machine); |
| if (err) |
| goto out; |
| |
| if (rec->opts.full_auxtrace) { |
| err = perf_event__synthesize_auxtrace_info(rec->itr, tool, |
| session, process_synthesized_event); |
| if (err) |
| goto out; |
| } |
| |
| err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, |
| machine); |
| WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n" |
| "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
| "Check /proc/kallsyms permission or run as root.\n"); |
| |
| err = perf_event__synthesize_modules(tool, process_synthesized_event, |
| machine); |
| WARN_ONCE(err < 0, "Couldn't record kernel module information.\n" |
| "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
| "Check /proc/modules permission or run as root.\n"); |
| |
| if (perf_guest) { |
| machines__process_guests(&session->machines, |
| perf_event__synthesize_guest_os, tool); |
| } |
| |
| err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads, |
| process_synthesized_event, opts->sample_address, |
| opts->proc_map_timeout); |
| out: |
| return err; |
| } |
| |
| static int __cmd_record(struct record *rec, int argc, const char **argv) |
| { |
| int err; |
| int status = 0; |
| unsigned long waking = 0; |
| const bool forks = argc > 0; |
| struct machine *machine; |
| struct perf_tool *tool = &rec->tool; |
| struct record_opts *opts = &rec->opts; |
| struct perf_data_file *file = &rec->file; |
| struct perf_session *session; |
| bool disabled = false, draining = false; |
| int fd; |
| |
| rec->progname = argv[0]; |
| |
| atexit(record__sig_exit); |
| signal(SIGCHLD, sig_handler); |
| signal(SIGINT, sig_handler); |
| signal(SIGTERM, sig_handler); |
| signal(SIGSEGV, sigsegv_handler); |
| |
| if (rec->opts.record_namespaces) |
| tool->namespace_events = true; |
| |
| if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) { |
| signal(SIGUSR2, snapshot_sig_handler); |
| if (rec->opts.auxtrace_snapshot_mode) |
| trigger_on(&auxtrace_snapshot_trigger); |
| if (rec->switch_output.enabled) |
| trigger_on(&switch_output_trigger); |
| } else { |
| signal(SIGUSR2, SIG_IGN); |
| } |
| |
| session = perf_session__new(file, false, tool); |
| if (session == NULL) { |
| pr_err("Perf session creation failed.\n"); |
| return -1; |
| } |
| |
| fd = perf_data_file__fd(file); |
| rec->session = session; |
| |
| record__init_features(rec); |
| |
| if (forks) { |
| err = perf_evlist__prepare_workload(rec->evlist, &opts->target, |
| argv, file->is_pipe, |
| workload_exec_failed_signal); |
| if (err < 0) { |
| pr_err("Couldn't run the workload!\n"); |
| status = err; |
| goto out_delete_session; |
| } |
| } |
| |
| if (record__open(rec) != 0) { |
| err = -1; |
| goto out_child; |
| } |
| |
| err = bpf__apply_obj_config(); |
| if (err) { |
| char errbuf[BUFSIZ]; |
| |
| bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf)); |
| pr_err("ERROR: Apply config to BPF failed: %s\n", |
| errbuf); |
| goto out_child; |
| } |
| |
| /* |
| * Normally perf_session__new would do this, but it doesn't have the |
| * evlist. |
| */ |
| if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) { |
| pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n"); |
| rec->tool.ordered_events = false; |
| } |
| |
| if (!rec->evlist->nr_groups) |
| perf_header__clear_feat(&session->header, HEADER_GROUP_DESC); |
| |
| if (file->is_pipe) { |
| err = perf_header__write_pipe(fd); |
| if (err < 0) |
| goto out_child; |
| } else { |
| err = perf_session__write_header(session, rec->evlist, fd, false); |
| if (err < 0) |
| goto out_child; |
| } |
| |
| if (!rec->no_buildid |
| && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { |
| pr_err("Couldn't generate buildids. " |
| "Use --no-buildid to profile anyway.\n"); |
| err = -1; |
| goto out_child; |
| } |
| |
| machine = &session->machines.host; |
| |
| err = record__synthesize(rec, false); |
| if (err < 0) |
| goto out_child; |
| |
| if (rec->realtime_prio) { |
| struct sched_param param; |
| |
| param.sched_priority = rec->realtime_prio; |
| if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { |
| pr_err("Could not set realtime priority.\n"); |
| err = -1; |
| goto out_child; |
| } |
| } |
| |
| /* |
| * When perf is starting the traced process, all the events |
| * (apart from group members) have enable_on_exec=1 set, |
| * so don't spoil it by prematurely enabling them. |
| */ |
| if (!target__none(&opts->target) && !opts->initial_delay) |
| perf_evlist__enable(rec->evlist); |
| |
| /* |
| * Let the child rip |
| */ |
| if (forks) { |
| union perf_event *event; |
| pid_t tgid; |
| |
| event = malloc(sizeof(event->comm) + machine->id_hdr_size); |
| if (event == NULL) { |
| err = -ENOMEM; |
| goto out_child; |
| } |
| |
| /* |
| * Some H/W events are generated before COMM event |
| * which is emitted during exec(), so perf script |
| * cannot see a correct process name for those events. |
| * Synthesize COMM event to prevent it. |
| */ |
| tgid = perf_event__synthesize_comm(tool, event, |
| rec->evlist->workload.pid, |
| process_synthesized_event, |
| machine); |
| free(event); |
| |
| if (tgid == -1) |
| goto out_child; |
| |
| event = malloc(sizeof(event->namespaces) + |
| (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + |
| machine->id_hdr_size); |
| if (event == NULL) { |
| err = -ENOMEM; |
| goto out_child; |
| } |
| |
| /* |
| * Synthesize NAMESPACES event for the command specified. |
| */ |
| perf_event__synthesize_namespaces(tool, event, |
| rec->evlist->workload.pid, |
| tgid, process_synthesized_event, |
| machine); |
| free(event); |
| |
| perf_evlist__start_workload(rec->evlist); |
| } |
| |
| if (opts->initial_delay) { |
| usleep(opts->initial_delay * USEC_PER_MSEC); |
| perf_evlist__enable(rec->evlist); |
| } |
| |
| trigger_ready(&auxtrace_snapshot_trigger); |
| trigger_ready(&switch_output_trigger); |
| perf_hooks__invoke_record_start(); |
| for (;;) { |
| unsigned long long hits = rec->samples; |
| |
| /* |
| * rec->evlist->bkw_mmap_state is possible to be |
| * BKW_MMAP_EMPTY here: when done == true and |
| * hits != rec->samples in previous round. |
| * |
| * perf_evlist__toggle_bkw_mmap ensure we never |
| * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING. |
| */ |
| if (trigger_is_hit(&switch_output_trigger) || done || draining) |
| perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING); |
| |
| if (record__mmap_read_all(rec) < 0) { |
| trigger_error(&auxtrace_snapshot_trigger); |
| trigger_error(&switch_output_trigger); |
| err = -1; |
| goto out_child; |
| } |
| |
| if (auxtrace_record__snapshot_started) { |
| auxtrace_record__snapshot_started = 0; |
| if (!trigger_is_error(&auxtrace_snapshot_trigger)) |
| record__read_auxtrace_snapshot(rec); |
| if (trigger_is_error(&auxtrace_snapshot_trigger)) { |
| pr_err("AUX area tracing snapshot failed\n"); |
| err = -1; |
| goto out_child; |
| } |
| } |
| |
| if (trigger_is_hit(&switch_output_trigger)) { |
| /* |
| * If switch_output_trigger is hit, the data in |
| * overwritable ring buffer should have been collected, |
| * so bkw_mmap_state should be set to BKW_MMAP_EMPTY. |
| * |
| * If SIGUSR2 raise after or during record__mmap_read_all(), |
| * record__mmap_read_all() didn't collect data from |
| * overwritable ring buffer. Read again. |
| */ |
| if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING) |
| continue; |
| trigger_ready(&switch_output_trigger); |
| |
| /* |
| * Reenable events in overwrite ring buffer after |
| * record__mmap_read_all(): we should have collected |
| * data from it. |
| */ |
| perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING); |
| |
| if (!quiet) |
| fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", |
| waking); |
| waking = 0; |
| fd = record__switch_output(rec, false); |
| if (fd < 0) { |
| pr_err("Failed to switch to new file\n"); |
| trigger_error(&switch_output_trigger); |
| err = fd; |
| goto out_child; |
| } |
| |
| /* re-arm the alarm */ |
| if (rec->switch_output.time) |
| alarm(rec->switch_output.time); |
| } |
| |
| if (hits == rec->samples) { |
| if (done || draining) |
| break; |
| err = perf_evlist__poll(rec->evlist, -1); |
| /* |
| * Propagate error, only if there's any. Ignore positive |
| * number of returned events and interrupt error. |
| */ |
| if (err > 0 || (err < 0 && errno == EINTR)) |
| err = 0; |
| waking++; |
| |
| if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0) |
| draining = true; |
| } |
| |
| /* |
| * When perf is starting the traced process, at the end events |
| * die with the process and we wait for that. Thus no need to |
| * disable events in this case. |
| */ |
| if (done && !disabled && !target__none(&opts->target)) { |
| trigger_off(&auxtrace_snapshot_trigger); |
| perf_evlist__disable(rec->evlist); |
| disabled = true; |
| } |
| } |
| trigger_off(&auxtrace_snapshot_trigger); |
| trigger_off(&switch_output_trigger); |
| |
| if (forks && workload_exec_errno) { |
| char msg[STRERR_BUFSIZE]; |
| const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg)); |
| pr_err("Workload failed: %s\n", emsg); |
| err = -1; |
| goto out_child; |
| } |
| |
| if (!quiet) |
| fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
| |
| if (target__none(&rec->opts.target)) |
| record__synthesize_workload(rec, true); |
| |
| out_child: |
| if (forks) { |
| int exit_status; |
| |
| if (!child_finished) |
| kill(rec->evlist->workload.pid, SIGTERM); |
| |
| wait(&exit_status); |
| |
| if (err < 0) |
| status = err; |
| else if (WIFEXITED(exit_status)) |
| status = WEXITSTATUS(exit_status); |
| else if (WIFSIGNALED(exit_status)) |
| signr = WTERMSIG(exit_status); |
| } else |
| status = err; |
| |
| record__synthesize(rec, true); |
| /* this will be recalculated during process_buildids() */ |
| rec->samples = 0; |
| |
| if (!err) { |
| if (!rec->timestamp_filename) { |
| record__finish_output(rec); |
| } else { |
| fd = record__switch_output(rec, true); |
| if (fd < 0) { |
| status = fd; |
| goto out_delete_session; |
| } |
| } |
| } |
| |
| perf_hooks__invoke_record_end(); |
| |
| if (!err && !quiet) { |
| char samples[128]; |
| const char *postfix = rec->timestamp_filename ? |
| ".<timestamp>" : ""; |
| |
| if (rec->samples && !rec->opts.full_auxtrace) |
| scnprintf(samples, sizeof(samples), |
| " (%" PRIu64 " samples)", rec->samples); |
| else |
| samples[0] = '\0'; |
| |
| fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n", |
| perf_data_file__size(file) / 1024.0 / 1024.0, |
| file->path, postfix, samples); |
| } |
| |
| out_delete_session: |
| perf_session__delete(session); |
| return status; |
| } |
| |
| static void callchain_debug(struct callchain_param *callchain) |
| { |
| static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" }; |
| |
| pr_debug("callchain: type %s\n", str[callchain->record_mode]); |
| |
| if (callchain->record_mode == CALLCHAIN_DWARF) |
| pr_debug("callchain: stack dump size %d\n", |
| callchain->dump_size); |
| } |
| |
| int record_opts__parse_callchain(struct record_opts *record, |
| struct callchain_param *callchain, |
| const char *arg, bool unset) |
| { |
| int ret; |
| callchain->enabled = !unset; |
| |
| /* --no-call-graph */ |
| if (unset) { |
| callchain->record_mode = CALLCHAIN_NONE; |
| pr_debug("callchain: disabled\n"); |
| return 0; |
| } |
| |
| ret = parse_callchain_record_opt(arg, callchain); |
| if (!ret) { |
| /* Enable data address sampling for DWARF unwind. */ |
| if (callchain->record_mode == CALLCHAIN_DWARF) |
| record->sample_address = true; |
| callchain_debug(callchain); |
| } |
| |
| return ret; |
| } |
| |
| int record_parse_callchain_opt(const struct option *opt, |
| const char *arg, |
| int unset) |
| { |
| return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset); |
| } |
| |
| int record_callchain_opt(const struct option *opt, |
| const char *arg __maybe_unused, |
| int unset __maybe_unused) |
| { |
| struct callchain_param *callchain = opt->value; |
| |
| callchain->enabled = true; |
| |
| if (callchain->record_mode == CALLCHAIN_NONE) |
| callchain->record_mode = CALLCHAIN_FP; |
| |
| callchain_debug(callchain); |
| return 0; |
| } |
| |
| static int perf_record_config(const char *var, const char *value, void *cb) |
| { |
| struct record *rec = cb; |
| |
| if (!strcmp(var, "record.build-id")) { |
| if (!strcmp(value, "cache")) |
| rec->no_buildid_cache = false; |
| else if (!strcmp(value, "no-cache")) |
| rec->no_buildid_cache = true; |
| else if (!strcmp(value, "skip")) |
| rec->no_buildid = true; |
| else |
| return -1; |
| return 0; |
| } |
| if (!strcmp(var, "record.call-graph")) |
| var = "call-graph.record-mode"; /* fall-through */ |
| |
| return perf_default_config(var, value, cb); |
| } |
| |
| struct clockid_map { |
| const char *name; |
| int clockid; |
| }; |
| |
| #define CLOCKID_MAP(n, c) \ |
| { .name = n, .clockid = (c), } |
| |
| #define CLOCKID_END { .name = NULL, } |
| |
| |
| /* |
| * Add the missing ones, we need to build on many distros... |
| */ |
| #ifndef CLOCK_MONOTONIC_RAW |
| #define CLOCK_MONOTONIC_RAW 4 |
| #endif |
| #ifndef CLOCK_BOOTTIME |
| #define CLOCK_BOOTTIME 7 |
| #endif |
| #ifndef CLOCK_TAI |
| #define CLOCK_TAI 11 |
| #endif |
| |
| static const struct clockid_map clockids[] = { |
| /* available for all events, NMI safe */ |
| CLOCKID_MAP("monotonic", CLOCK_MONOTONIC), |
| CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW), |
| |
| /* available for some events */ |
| CLOCKID_MAP("realtime", CLOCK_REALTIME), |
| CLOCKID_MAP("boottime", CLOCK_BOOTTIME), |
| CLOCKID_MAP("tai", CLOCK_TAI), |
| |
| /* available for the lazy */ |
| CLOCKID_MAP("mono", CLOCK_MONOTONIC), |
| CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW), |
| CLOCKID_MAP("real", CLOCK_REALTIME), |
| CLOCKID_MAP("boot", CLOCK_BOOTTIME), |
| |
| CLOCKID_END, |
| }; |
| |
| static int parse_clockid(const struct option *opt, const char *str, int unset) |
| { |
| struct record_opts *opts = (struct record_opts *)opt->value; |
| const struct clockid_map *cm; |
| const char *ostr = str; |
| |
| if (unset) { |
| opts->use_clockid = 0; |
| return 0; |
| } |
| |
| /* no arg passed */ |
| if (!str) |
| return 0; |
| |
| /* no setting it twice */ |
| if (opts->use_clockid) |
| return -1; |
| |
| opts->use_clockid = true; |
| |
| /* if its a number, we're done */ |
| if (sscanf(str, "%d", &opts->clockid) == 1) |
| return 0; |
| |
| /* allow a "CLOCK_" prefix to the name */ |
| if (!strncasecmp(str, "CLOCK_", 6)) |
| str += 6; |
| |
| for (cm = clockids; cm->name; cm++) { |
| if (!strcasecmp(str, cm->name)) { |
| opts->clockid = cm->clockid; |
| return 0; |
| } |
| } |
| |
| opts->use_clockid = false; |
| ui__warning("unknown clockid %s, check man page\n", ostr); |
| return -1; |
| } |
| |
| static int record__parse_mmap_pages(const struct option *opt, |
| const char *str, |
| int unset __maybe_unused) |
| { |
| struct record_opts *opts = opt->value; |
| char *s, *p; |
| unsigned int mmap_pages; |
| int ret; |
| |
| if (!str) |
| return -EINVAL; |
| |
| s = strdup(str); |
| if (!s) |
| return -ENOMEM; |
| |
| p = strchr(s, ','); |
| if (p) |
| *p = '\0'; |
| |
| if (*s) { |
| ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s); |
| if (ret) |
| goto out_free; |
| opts->mmap_pages = mmap_pages; |
| } |
| |
| if (!p) { |
| ret = 0; |
| goto out_free; |
| } |
| |
| ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1); |
| if (ret) |
| goto out_free; |
| |
| opts->auxtrace_mmap_pages = mmap_pages; |
| |
| out_free: |
| free(s); |
| return ret; |
| } |
| |
| static void switch_output_size_warn(struct record *rec) |
| { |
| u64 wakeup_size = perf_evlist__mmap_size(rec->opts.mmap_pages); |
| struct switch_output *s = &rec->switch_output; |
| |
| wakeup_size /= 2; |
| |
| if (s->size < wakeup_size) { |
| char buf[100]; |
| |
| unit_number__scnprintf(buf, sizeof(buf), wakeup_size); |
| pr_warning("WARNING: switch-output data size lower than " |
| "wakeup kernel buffer size (%s) " |
| "expect bigger perf.data sizes\n", buf); |
| } |
| } |
| |
| static int switch_output_setup(struct record *rec) |
| { |
| struct switch_output *s = &rec->switch_output; |
| static struct parse_tag tags_size[] = { |
| { .tag = 'B', .mult = 1 }, |
| { .tag = 'K', .mult = 1 << 10 }, |
| { .tag = 'M', .mult = 1 << 20 }, |
| { .tag = 'G', .mult = 1 << 30 }, |
| { .tag = 0 }, |
| }; |
| static struct parse_tag tags_time[] = { |
| { .tag = 's', .mult = 1 }, |
| { .tag = 'm', .mult = 60 }, |
| { .tag = 'h', .mult = 60*60 }, |
| { .tag = 'd', .mult = 60*60*24 }, |
| { .tag = 0 }, |
| }; |
| unsigned long val; |
| |
| if (!s->set) |
| return 0; |
| |
| if (!strcmp(s->str, "signal")) { |
| s->signal = true; |
| pr_debug("switch-output with SIGUSR2 signal\n"); |
| goto enabled; |
| } |
| |
| val = parse_tag_value(s->str, tags_size); |
| if (val != (unsigned long) -1) { |
| s->size = val; |
| pr_debug("switch-output with %s size threshold\n", s->str); |
| goto enabled; |
| } |
| |
| val = parse_tag_value(s->str, tags_time); |
| if (val != (unsigned long) -1) { |
| s->time = val; |
| pr_debug("switch-output with %s time threshold (%lu seconds)\n", |
| s->str, s->time); |
| goto enabled; |
| } |
| |
| return -1; |
| |
| enabled: |
| rec->timestamp_filename = true; |
| s->enabled = true; |
| |
| if (s->size && !rec->opts.no_buffering) |
| switch_output_size_warn(rec); |
| |
| return 0; |
| } |
| |
| static const char * const __record_usage[] = { |
| "perf record [<options>] [<command>]", |
| "perf record [<options>] -- <command> [<options>]", |
| NULL |
| }; |
| const char * const *record_usage = __record_usage; |
| |
| /* |
| * XXX Ideally would be local to cmd_record() and passed to a record__new |
| * because we need to have access to it in record__exit, that is called |
| * after cmd_record() exits, but since record_options need to be accessible to |
| * builtin-script, leave it here. |
| * |
| * At least we don't ouch it in all the other functions here directly. |
| * |
| * Just say no to tons of global variables, sigh. |
| */ |
| static struct record record = { |
| .opts = { |
| .sample_time = true, |
| .mmap_pages = UINT_MAX, |
| .user_freq = UINT_MAX, |
| .user_interval = ULLONG_MAX, |
| .freq = 4000, |
| .target = { |
| .uses_mmap = true, |
| .default_per_cpu = true, |
| }, |
| .proc_map_timeout = 500, |
| }, |
| .tool = { |
| .sample = process_sample_event, |
| .fork = perf_event__process_fork, |
| .exit = perf_event__process_exit, |
| .comm = perf_event__process_comm, |
| .namespaces = perf_event__process_namespaces, |
| .mmap = perf_event__process_mmap, |
| .mmap2 = perf_event__process_mmap2, |
| .ordered_events = true, |
| }, |
| }; |
| |
| const char record_callchain_help[] = CALLCHAIN_RECORD_HELP |
| "\n\t\t\t\tDefault: fp"; |
| |
| static bool dry_run; |
| |
| /* |
| * XXX Will stay a global variable till we fix builtin-script.c to stop messing |
| * with it and switch to use the library functions in perf_evlist that came |
| * from builtin-record.c, i.e. use record_opts, |
| * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record', |
| * using pipes, etc. |
| */ |
| static struct option __record_options[] = { |
| OPT_CALLBACK('e', "event", &record.evlist, "event", |
| "event selector. use 'perf list' to list available events", |
| parse_events_option), |
| OPT_CALLBACK(0, "filter", &record.evlist, "filter", |
| "event filter", parse_filter), |
| OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist, |
| NULL, "don't record events from perf itself", |
| exclude_perf), |
| OPT_STRING('p', "pid", &record.opts.target.pid, "pid", |
| "record events on existing process id"), |
| OPT_STRING('t', "tid", &record.opts.target.tid, "tid", |
| "record events on existing thread id"), |
| OPT_INTEGER('r', "realtime", &record.realtime_prio, |
| "collect data with this RT SCHED_FIFO priority"), |
| OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering, |
| "collect data without buffering"), |
| OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples, |
| "collect raw sample records from all opened counters"), |
| OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide, |
| "system-wide collection from all CPUs"), |
| OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu", |
| "list of cpus to monitor"), |
| OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"), |
| OPT_STRING('o', "output", &record.file.path, "file", |
| "output file name"), |
| OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit, |
| &record.opts.no_inherit_set, |
| "child tasks do not inherit counters"), |
| OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, |
| "synthesize non-sample events at the end of output"), |
| OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), |
| OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"), |
| OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", |
| "number of mmap data pages and AUX area tracing mmap pages", |
| record__parse_mmap_pages), |
| OPT_BOOLEAN(0, "group", &record.opts.group, |
| "put the counters into a counter group"), |
| OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, |
| NULL, "enables call-graph recording" , |
| &record_callchain_opt), |
| OPT_CALLBACK(0, "call-graph", &record.opts, |
| "record_mode[,record_size]", record_callchain_help, |
| &record_parse_callchain_opt), |
| OPT_INCR('v', "verbose", &verbose, |
| "be more verbose (show counter open errors, etc)"), |
| OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
| OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat, |
| "per thread counts"), |
| OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"), |
| OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"), |
| OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time, |
| &record.opts.sample_time_set, |
| "Record the sample timestamps"), |
| OPT_BOOLEAN('P', "period", &record.opts.period, "Record the sample period"), |
| OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples, |
| "don't sample"), |
| OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache, |
| &record.no_buildid_cache_set, |
| "do not update the buildid cache"), |
| OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid, |
| &record.no_buildid_set, |
| "do not collect buildids in perf.data"), |
| OPT_CALLBACK('G', "cgroup", &record.evlist, "name", |
| "monitor event in cgroup name only", |
| parse_cgroups), |
| OPT_UINTEGER('D', "delay", &record.opts.initial_delay, |
| "ms to wait before starting measurement after program start"), |
| OPT_STRING('u', "uid", &record.opts.target.uid_str, "user", |
| "user to profile"), |
| |
| OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack, |
| "branch any", "sample any taken branches", |
| parse_branch_stack), |
| |
| OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack, |
| "branch filter mask", "branch stack filter modes", |
| parse_branch_stack), |
| OPT_BOOLEAN('W', "weight", &record.opts.sample_weight, |
| "sample by weight (on special events only)"), |
| OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction, |
| "sample transaction flags (special events only)"), |
| OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread, |
| "use per-thread mmaps"), |
| OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register", |
| "sample selected machine registers on interrupt," |
| " use -I ? to list register names", parse_regs), |
| OPT_BOOLEAN(0, "running-time", &record.opts.running_time, |
| "Record running/enabled time of read (:S) events"), |
| OPT_CALLBACK('k', "clockid", &record.opts, |
| "clockid", "clockid to use for events, see clock_gettime()", |
| parse_clockid), |
| OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts, |
| "opts", "AUX area tracing Snapshot Mode", ""), |
| OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout, |
| "per thread proc mmap processing timeout in ms"), |
| OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces, |
| "Record namespaces events"), |
| OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events, |
| "Record context switch events"), |
| OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel, |
| "Configure all used events to run in kernel space.", |
| PARSE_OPT_EXCLUSIVE), |
| OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user, |
| "Configure all used events to run in user space.", |
| PARSE_OPT_EXCLUSIVE), |
| OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path", |
| "clang binary to use for compiling BPF scriptlets"), |
| OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options", |
| "options passed to clang when compiling BPF scriptlets"), |
| OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, |
| "file", "vmlinux pathname"), |
| OPT_BOOLEAN(0, "buildid-all", &record.buildid_all, |
| "Record build-id of all DSOs regardless of hits"), |
| OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename, |
| "append timestamp to output filename"), |
| OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str, |
| &record.switch_output.set, "signal,size,time", |
| "Switch output when receive SIGUSR2 or cross size,time threshold", |
| "signal"), |
| OPT_BOOLEAN(0, "dry-run", &dry_run, |
| "Parse options then exit"), |
| OPT_END() |
| }; |
| |
| struct option *record_options = __record_options; |
| |
| int cmd_record(int argc, const char **argv) |
| { |
| int err; |
| struct record *rec = &record; |
| char errbuf[BUFSIZ]; |
| |
| #ifndef HAVE_LIBBPF_SUPPORT |
| # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c) |
| set_nobuild('\0', "clang-path", true); |
| set_nobuild('\0', "clang-opt", true); |
| # undef set_nobuild |
| #endif |
| |
| #ifndef HAVE_BPF_PROLOGUE |
| # if !defined (HAVE_DWARF_SUPPORT) |
| # define REASON "NO_DWARF=1" |
| # elif !defined (HAVE_LIBBPF_SUPPORT) |
| # define REASON "NO_LIBBPF=1" |
| # else |
| # define REASON "this architecture doesn't support BPF prologue" |
| # endif |
| # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c) |
| set_nobuild('\0', "vmlinux", true); |
| # undef set_nobuild |
| # undef REASON |
| #endif |
| |
| rec->evlist = perf_evlist__new(); |
| if (rec->evlist == NULL) |
| return -ENOMEM; |
| |
| err = perf_config(perf_record_config, rec); |
| if (err) |
| return err; |
| |
| argc = parse_options(argc, argv, record_options, record_usage, |
| PARSE_OPT_STOP_AT_NON_OPTION); |
| if (quiet) |
| perf_quiet_option(); |
| |
| /* Make system wide (-a) the default target. */ |
| if (!argc && target__none(&rec->opts.target)) |
| rec->opts.target.system_wide = true; |
| |
| if (nr_cgroups && !rec->opts.target.system_wide) { |
| usage_with_options_msg(record_usage, record_options, |
| "cgroup monitoring only available in system-wide mode"); |
| |
| } |
| if (rec->opts.record_switch_events && |
| !perf_can_record_switch_events()) { |
| ui__error("kernel does not support recording context switch events\n"); |
| parse_options_usage(record_usage, record_options, "switch-events", 0); |
| return -EINVAL; |
| } |
| |
| if (switch_output_setup(rec)) { |
| parse_options_usage(record_usage, record_options, "switch-output", 0); |
| return -EINVAL; |
| } |
| |
| if (rec->switch_output.time) { |
| signal(SIGALRM, alarm_sig_handler); |
| alarm(rec->switch_output.time); |
| } |
| |
| if (!rec->itr) { |
| rec->itr = auxtrace_record__init(rec->evlist, &err); |
| if (err) |
| goto out; |
| } |
| |
| err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, |
| rec->opts.auxtrace_snapshot_opts); |
| if (err) |
| goto out; |
| |
| /* |
| * Allow aliases to facilitate the lookup of symbols for address |
| * filters. Refer to auxtrace_parse_filters(). |
| */ |
| symbol_conf.allow_aliases = true; |
| |
| symbol__init(NULL); |
| |
| err = auxtrace_parse_filters(rec->evlist); |
| if (err) |
| goto out; |
| |
| if (dry_run) |
| goto out; |
| |
| err = bpf__setup_stdout(rec->evlist); |
| if (err) { |
| bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf)); |
| pr_err("ERROR: Setup BPF stdout failed: %s\n", |
| errbuf); |
| goto out; |
| } |
| |
| err = -ENOMEM; |
| |
| if (symbol_conf.kptr_restrict) |
| pr_warning( |
| "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" |
| "check /proc/sys/kernel/kptr_restrict.\n\n" |
| "Samples in kernel functions may not be resolved if a suitable vmlinux\n" |
| "file is not found in the buildid cache or in the vmlinux path.\n\n" |
| "Samples in kernel modules won't be resolved at all.\n\n" |
| "If some relocation was applied (e.g. kexec) symbols may be misresolved\n" |
| "even with a suitable vmlinux or kallsyms file.\n\n"); |
| |
| if (rec->no_buildid_cache || rec->no_buildid) { |
| disable_buildid_cache(); |
| } else if (rec->switch_output.enabled) { |
| /* |
| * In 'perf record --switch-output', disable buildid |
| * generation by default to reduce data file switching |
| * overhead. Still generate buildid if they are required |
| * explicitly using |
| * |
| * perf record --switch-output --no-no-buildid \ |
| * --no-no-buildid-cache |
| * |
| * Following code equals to: |
| * |
| * if ((rec->no_buildid || !rec->no_buildid_set) && |
| * (rec->no_buildid_cache || !rec->no_buildid_cache_set)) |
| * disable_buildid_cache(); |
| */ |
| bool disable = true; |
| |
| if (rec->no_buildid_set && !rec->no_buildid) |
| disable = false; |
| if (rec->no_buildid_cache_set && !rec->no_buildid_cache) |
| disable = false; |
| if (disable) { |
| rec->no_buildid = true; |
| rec->no_buildid_cache = true; |
| disable_buildid_cache(); |
| } |
| } |
| |
| if (record.opts.overwrite) |
| record.opts.tail_synthesize = true; |
| |
| if (rec->evlist->nr_entries == 0 && |
| perf_evlist__add_default(rec->evlist) < 0) { |
| pr_err("Not enough memory for event selector list\n"); |
| goto out; |
| } |
| |
| if (rec->opts.target.tid && !rec->opts.no_inherit_set) |
| rec->opts.no_inherit = true; |
| |
| err = target__validate(&rec->opts.target); |
| if (err) { |
| target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
| ui__warning("%s", errbuf); |
| } |
| |
| err = target__parse_uid(&rec->opts.target); |
| if (err) { |
| int saved_errno = errno; |
| |
| target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); |
| ui__error("%s", errbuf); |
| |
| err = -saved_errno; |
| goto out; |
| } |
| |
| /* Enable ignoring missing threads when -u option is defined. */ |
| rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX; |
| |
| err = -ENOMEM; |
| if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0) |
| usage_with_options(record_usage, record_options); |
| |
| err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); |
| if (err) |
| goto out; |
| |
| /* |
| * We take all buildids when the file contains |
| * AUX area tracing data because we do not decode the |
| * trace because it would take too long. |
| */ |
| if (rec->opts.full_auxtrace) |
| rec->buildid_all = true; |
| |
| if (record_opts__config(&rec->opts)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = __cmd_record(&record, argc, argv); |
| out: |
| perf_evlist__delete(rec->evlist); |
| symbol__exit(); |
| auxtrace_record__free(rec->itr); |
| return err; |
| } |
| |
| static void snapshot_sig_handler(int sig __maybe_unused) |
| { |
| struct record *rec = &record; |
| |
| if (trigger_is_ready(&auxtrace_snapshot_trigger)) { |
| trigger_hit(&auxtrace_snapshot_trigger); |
| auxtrace_record__snapshot_started = 1; |
| if (auxtrace_record__snapshot_start(record.itr)) |
| trigger_error(&auxtrace_snapshot_trigger); |
| } |
| |
| if (switch_output_signal(rec)) |
| trigger_hit(&switch_output_trigger); |
| } |
| |
| static void alarm_sig_handler(int sig __maybe_unused) |
| { |
| struct record *rec = &record; |
| |
| if (switch_output_time(rec)) |
| trigger_hit(&switch_output_trigger); |
| } |