From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- tools/perf/builtin-record.c | 1902 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1902 insertions(+) create mode 100644 tools/perf/builtin-record.c (limited to 'tools/perf/builtin-record.c') diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c new file mode 100644 index 000000000..22ebeb92a --- /dev/null +++ b/tools/perf/builtin-record.c @@ -0,0 +1,1902 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 +#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 "util/time-utils.h" +#include "util/units.h" +#include "asm/bug.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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 data; + struct auxtrace_record *itr; + struct perf_evlist *evlist; + struct perf_session *session; + 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; + bool timestamp_boundary; + 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__write(rec->session->data, 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 record__pushfn(void *to, void *bf, size_t size) +{ + struct record *rec = to; + + rec->samples++; + return record__write(rec, bf, size); +} + +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 *data = &rec->data; + size_t padding; + u8 pad[8] = {0}; + + if (!perf_data__is_pipe(data)) { + off_t file_offset; + int fd = perf_data__fd(data); + 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); + } +} + +static int record__auxtrace_init(struct record *rec) +{ + int err; + + if (!rec->itr) { + rec->itr = auxtrace_record__init(rec->evlist, &err); + if (err) + return err; + } + + err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, + rec->opts.auxtrace_snapshot_opts); + if (err) + return err; + + return auxtrace_parse_filters(rec->evlist); +} + +#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; +} + +static int record__auxtrace_init(struct record *rec __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, + 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; + + /* + * For initial_delay we need to add a dummy event so that we can track + * PERF_RECORD_MMAP while we wait for the initial delay to enable the + * real events, the ones asked by the user. + */ + if (opts->initial_delay) { + if (perf_evlist__add_dummy(evlist)) + return -ENOMEM; + + pos = perf_evlist__first(evlist); + pos->tracking = 0; + pos = perf_evlist__last(evlist); + pos->tracking = 1; + pos->attr.enable_on_exec = 1; + } + + 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; + } + + pos->supported = true; + } + + if (perf_evlist__apply_filters(evlist, &pos)) { + pr_err("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)) { + pr_err("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); + + if (rec->evlist->first_sample_time == 0) + rec->evlist->first_sample_time = sample->time; + + rec->evlist->last_sample_time = sample->time; + + if (rec->buildid_all) + return 0; + + rec->samples++; + return build_id__mark_dso_hit(tool, event, sample, evsel, machine); +} + +static int process_buildids(struct record *rec) +{ + struct perf_data *data = &rec->data; + struct perf_session *session = rec->session; + + if (data->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. But if timestamp_boundary is enabled, + * it still needs to walk on all samples to get the timestamps of + * first/last samples. + */ + if (rec->buildid_all && !rec->timestamp_boundary) + 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 overwrite) +{ + u64 bytes_written = rec->bytes_written; + int i; + int rc = 0; + struct perf_mmap *maps; + + if (!evlist) + return 0; + + maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; + if (!maps) + return 0; + + if (overwrite && 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 (perf_mmap__push(&maps[i], rec, record__pushfn) != 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 (overwrite) + 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 *data = &rec->data; + int fd = perf_data__fd(data); + + if (data->is_pipe) + return; + + rec->session->header.data_size += rec->bytes_written; + data->size = lseek(perf_data__fd(data), 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 *data = &rec->data; + 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__switch(data, 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", + data->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->overwrite_mmap && evlist->overwrite_mmap[0].base) + return evlist->overwrite_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 *data = &rec->data; + struct record_opts *opts = &rec->opts; + struct perf_tool *tool = &rec->tool; + int fd = perf_data__fd(data); + int err = 0; + + if (rec->opts.tail_synthesize != tail) + return 0; + + if (data->is_pipe) { + /* + * We need to synthesize events first, because some + * features works on top of them (on report side). + */ + err = perf_event__synthesize_attrs(tool, session, + process_synthesized_event); + if (err < 0) { + pr_err("Couldn't synthesize attrs.\n"); + goto out; + } + + err = perf_event__synthesize_features(tool, session, rec->evlist, + process_synthesized_event); + if (err < 0) { + pr_err("Couldn't synthesize features.\n"); + return err; + } + + 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; + } + + if (!perf_evlist__exclude_kernel(rec->evlist)) { + 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 = perf_event__synthesize_extra_attr(&rec->tool, + rec->evlist, + process_synthesized_event, + data->is_pipe); + if (err) + goto out; + + err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->threads, + process_synthesized_event, + NULL); + if (err < 0) { + pr_err("Couldn't synthesize thread map.\n"); + return err; + } + + err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->cpus, + process_synthesized_event, NULL); + if (err < 0) { + pr_err("Couldn't synthesize cpu map.\n"); + return err; + } + + err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads, + process_synthesized_event, opts->sample_address, + opts->proc_map_timeout, 1); +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 perf_tool *tool = &rec->tool; + struct record_opts *opts = &rec->opts; + struct perf_data *data = &rec->data; + struct perf_session *session; + bool disabled = false, draining = false; + int fd; + + 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(data, false, tool); + if (session == NULL) { + pr_err("Perf session creation failed.\n"); + return -1; + } + + fd = perf_data__fd(data); + rec->session = session; + + record__init_features(rec); + + if (forks) { + err = perf_evlist__prepare_workload(rec->evlist, &opts->target, + argv, data->is_pipe, + workload_exec_failed_signal); + if (err < 0) { + pr_err("Couldn't run the workload!\n"); + status = err; + goto out_delete_session; + } + } + + /* + * If we have just single event and are sending data + * through pipe, we need to force the ids allocation, + * because we synthesize event name through the pipe + * and need the id for that. + */ + if (data->is_pipe && rec->evlist->nr_entries == 1) + rec->opts.sample_id = true; + + 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 (data->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; + } + + 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) { + struct machine *machine = &session->machines.host; + 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 ? + "." : ""; + + 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__size(data) / 1024.0 / 1024.0, + data->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"; + return perf_default_config(var, value, cb); + } + + return 0; +} + +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 [] []", + "perf record [] -- []", + 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.data.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_BOOLEAN(0, "strict-freq", &record.opts.strict_freq, + "Fail if the specified frequency can't be used"), + OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", + "profile at this frequency", + record__parse_freq), + 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, "phys-data", &record.opts.sample_phys_addr, + "Record the sample physical 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_SET('P', "period", &record.opts.period, &record.opts.period_set, + "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_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_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_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary, + "Record timestamp boundary (time of first/last samples)"), + 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]; + + setlocale(LC_ALL, ""); + +#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); + } + + /* + * 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 = record__auxtrace_init(rec); + 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 && !perf_evlist__exclude_kernel(rec->evlist)) + 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, !record.opts.no_samples) < 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\n", 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/-p option is defined. */ + rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid; + + 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); +} -- cgit v1.2.3