Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1902 insertions, 0 deletions

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 <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 "util/time-utils.h"
+#include "util/units.h"
+#include "asm/bug.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <locale.h>
+#include <poll.h>
+#include <unistd.h>
+#include <sched.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <sys/wait.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	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, &param)) {
+			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 ?
+					".<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__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 [<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.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);
+}