1 files changed, 1070 insertions, 0 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
new file mode 100644
index 00000000..cdf58ecc
--- /dev/null
+++ b/tools/perf/builtin-record.c
@@ -0,0 +1,1070 @@
+/*
+ * 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 "util/parse-options.h"
+#include "util/parse-events.h"
+
+#include "util/header.h"
+#include "util/event.h"
+#include "util/evlist.h"
+#include "util/evsel.h"
+#include "util/debug.h"
+#include "util/session.h"
+#include "util/tool.h"
+#include "util/symbol.h"
+#include "util/cpumap.h"
+#include "util/thread_map.h"
+
+#include <unistd.h>
+#include <sched.h>
+#include <sys/mman.h>
+
+#ifndef HAVE_ON_EXIT
+#ifndef ATEXIT_MAX
+#define ATEXIT_MAX 32
+#endif
+static int __on_exit_count = 0;
+typedef void (*on_exit_func_t) (int, void *);
+static on_exit_func_t __on_exit_funcs[ATEXIT_MAX];
+static void *__on_exit_args[ATEXIT_MAX];
+static int __exitcode = 0;
+static void __handle_on_exit_funcs(void);
+static int on_exit(on_exit_func_t function, void *arg);
+#define exit(x) (exit)(__exitcode = (x))
+
+static int on_exit(on_exit_func_t function, void *arg)
+{
+	if (__on_exit_count == ATEXIT_MAX)
+		return -ENOMEM;
+	else if (__on_exit_count == 0)
+		atexit(__handle_on_exit_funcs);
+	__on_exit_funcs[__on_exit_count] = function;
+	__on_exit_args[__on_exit_count++] = arg;
+	return 0;
+}
+
+static void __handle_on_exit_funcs(void)
+{
+	int i;
+	for (i = 0; i < __on_exit_count; i++)
+		__on_exit_funcs[i] (__exitcode, __on_exit_args[i]);
+}
+#endif
+
+enum write_mode_t {
+	WRITE_FORCE,
+	WRITE_APPEND
+};
+
+struct perf_record {
+	struct perf_tool	tool;
+	struct perf_record_opts	opts;
+	u64			bytes_written;
+	const char		*output_name;
+	struct perf_evlist	*evlist;
+	struct perf_session	*session;
+	const char		*progname;
+	int			output;
+	unsigned int		page_size;
+	int			realtime_prio;
+	enum write_mode_t	write_mode;
+	bool			no_buildid;
+	bool			no_buildid_cache;
+	bool			force;
+	bool			file_new;
+	bool			append_file;
+	long			samples;
+	off_t			post_processing_offset;
+};
+
+static void advance_output(struct perf_record *rec, size_t size)
+{
+	rec->bytes_written += size;
+}
+
+static int write_output(struct perf_record *rec, void *buf, size_t size)
+{
+	while (size) {
+		int ret = write(rec->output, buf, size);
+
+		if (ret < 0) {
+			pr_err("failed to write\n");
+			return -1;
+		}
+
+		size -= ret;
+		buf += ret;
+
+		rec->bytes_written += ret;
+	}
+
+	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 perf_record *rec = container_of(tool, struct perf_record, tool);
+	if (write_output(rec, event, event->header.size) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int perf_record__mmap_read(struct perf_record *rec,
+				   struct perf_mmap *md)
+{
+	unsigned int head = perf_mmap__read_head(md);
+	unsigned int old = md->prev;
+	unsigned char *data = md->base + rec->page_size;
+	unsigned long size;
+	void *buf;
+	int rc = 0;
+
+	if (old == head)
+		return 0;
+
+	rec->samples++;
+
+	size = head - old;
+
+	if ((old & md->mask) + size != (head & md->mask)) {
+		buf = &data[old & md->mask];
+		size = md->mask + 1 - (old & md->mask);
+		old += size;
+
+		if (write_output(rec, buf, size) < 0) {
+			rc = -1;
+			goto out;
+		}
+	}
+
+	buf = &data[old & md->mask];
+	size = head - old;
+	old += size;
+
+	if (write_output(rec, buf, size) < 0) {
+		rc = -1;
+		goto out;
+	}
+
+	md->prev = old;
+	perf_mmap__write_tail(md, old);
+
+out:
+	return rc;
+}
+
+static volatile int done = 0;
+static volatile int signr = -1;
+static volatile int child_finished = 0;
+
+static void sig_handler(int sig)
+{
+	if (sig == SIGCHLD)
+		child_finished = 1;
+
+	done = 1;
+	signr = sig;
+}
+
+static void perf_record__sig_exit(int exit_status __maybe_unused, void *arg)
+{
+	struct perf_record *rec = arg;
+	int status;
+
+	if (rec->evlist->workload.pid > 0) {
+		if (!child_finished)
+			kill(rec->evlist->workload.pid, SIGTERM);
+
+		wait(&status);
+		if (WIFSIGNALED(status))
+			psignal(WTERMSIG(status), rec->progname);
+	}
+
+	if (signr == -1 || signr == SIGUSR1)
+		return;
+
+	signal(signr, SIG_DFL);
+	kill(getpid(), signr);
+}
+
+static bool perf_evlist__equal(struct perf_evlist *evlist,
+			       struct perf_evlist *other)
+{
+	struct perf_evsel *pos, *pair;
+
+	if (evlist->nr_entries != other->nr_entries)
+		return false;
+
+	pair = perf_evlist__first(other);
+
+	list_for_each_entry(pos, &evlist->entries, node) {
+		if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
+			return false;
+		pair = perf_evsel__next(pair);
+	}
+
+	return true;
+}
+
+static int perf_record__open(struct perf_record *rec)
+{
+	char msg[512];
+	struct perf_evsel *pos;
+	struct perf_evlist *evlist = rec->evlist;
+	struct perf_session *session = rec->session;
+	struct perf_record_opts *opts = &rec->opts;
+	int rc = 0;
+
+	perf_evlist__config(evlist, opts);
+
+	list_for_each_entry(pos, &evlist->entries, node) {
+try_again:
+		if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) {
+			if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
+				if (verbose)
+					ui__warning("%s\n", msg);
+				goto try_again;
+			}
+
+			rc = -errno;
+			perf_evsel__open_strerror(pos, &opts->target,
+						  errno, msg, sizeof(msg));
+			ui__error("%s\n", msg);
+			goto out;
+		}
+	}
+
+	if (perf_evlist__apply_filters(evlist)) {
+		error("failed to set filter with %d (%s)\n", errno,
+			strerror(errno));
+		rc = -1;
+		goto out;
+	}
+
+	if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 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: %d)\n", opts->mmap_pages);
+			rc = -errno;
+		} else if (!is_power_of_2(opts->mmap_pages) &&
+			   (opts->mmap_pages != UINT_MAX)) {
+			pr_err("--mmap_pages/-m value must be a power of two.");
+			rc = -EINVAL;
+		} else {
+			pr_err("failed to mmap with %d (%s)\n", errno, strerror(errno));
+			rc = -errno;
+		}
+		goto out;
+	}
+
+	if (rec->file_new)
+		session->evlist = evlist;
+	else {
+		if (!perf_evlist__equal(session->evlist, evlist)) {
+			fprintf(stderr, "incompatible append\n");
+			rc = -1;
+			goto out;
+		}
+ 	}
+
+	perf_session__set_id_hdr_size(session);
+out:
+	return rc;
+}
+
+static int process_buildids(struct perf_record *rec)
+{
+	u64 size = lseek(rec->output, 0, SEEK_CUR);
+
+	if (size == 0)
+		return 0;
+
+	rec->session->fd = rec->output;
+	return __perf_session__process_events(rec->session, rec->post_processing_offset,
+					      size - rec->post_processing_offset,
+					      size, &build_id__mark_dso_hit_ops);
+}
+
+static void perf_record__exit(int status, void *arg)
+{
+	struct perf_record *rec = arg;
+
+	if (status != 0)
+		return;
+
+	if (!rec->opts.pipe_output) {
+		rec->session->header.data_size += rec->bytes_written;
+
+		if (!rec->no_buildid)
+			process_buildids(rec);
+		perf_session__write_header(rec->session, rec->evlist,
+					   rec->output, true);
+		perf_session__delete(rec->session);
+		perf_evlist__delete(rec->evlist);
+		symbol__exit();
+	}
+}
+
+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, "_text");
+	if (err < 0)
+		err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
+							 machine, "_stext");
+	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 perf_record__mmap_read_all(struct perf_record *rec)
+{
+	int i;
+	int rc = 0;
+
+	for (i = 0; i < rec->evlist->nr_mmaps; i++) {
+		if (rec->evlist->mmap[i].base) {
+			if (perf_record__mmap_read(rec, &rec->evlist->mmap[i]) != 0) {
+				rc = -1;
+				goto out;
+			}
+		}
+	}
+
+	if (perf_header__has_feat(&rec->session->header, HEADER_TRACING_DATA))
+		rc = write_output(rec, &finished_round_event,
+				  sizeof(finished_round_event));
+
+out:
+	return rc;
+}
+
+static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
+{
+	struct stat st;
+	int flags;
+	int err, output, feat;
+	unsigned long waking = 0;
+	const bool forks = argc > 0;
+	struct machine *machine;
+	struct perf_tool *tool = &rec->tool;
+	struct perf_record_opts *opts = &rec->opts;
+	struct perf_evlist *evsel_list = rec->evlist;
+	const char *output_name = rec->output_name;
+	struct perf_session *session;
+	bool disabled = false;
+
+	rec->progname = argv[0];
+
+	rec->page_size = sysconf(_SC_PAGE_SIZE);
+
+	on_exit(perf_record__sig_exit, rec);
+	signal(SIGCHLD, sig_handler);
+	signal(SIGINT, sig_handler);
+	signal(SIGUSR1, sig_handler);
+
+	if (!output_name) {
+		if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
+			opts->pipe_output = true;
+		else
+			rec->output_name = output_name = "perf.data";
+	}
+	if (output_name) {
+		if (!strcmp(output_name, "-"))
+			opts->pipe_output = true;
+		else if (!stat(output_name, &st) && st.st_size) {
+			if (rec->write_mode == WRITE_FORCE) {
+				char oldname[PATH_MAX];
+				snprintf(oldname, sizeof(oldname), "%s.old",
+					 output_name);
+				unlink(oldname);
+				rename(output_name, oldname);
+			}
+		} else if (rec->write_mode == WRITE_APPEND) {
+			rec->write_mode = WRITE_FORCE;
+		}
+	}
+
+	flags = O_CREAT|O_RDWR;
+	if (rec->write_mode == WRITE_APPEND)
+		rec->file_new = 0;
+	else
+		flags |= O_TRUNC;
+
+	if (opts->pipe_output)
+		output = STDOUT_FILENO;
+	else
+		output = open(output_name, flags, S_IRUSR | S_IWUSR);
+	if (output < 0) {
+		perror("failed to create output file");
+		return -1;
+	}
+
+	rec->output = output;
+
+	session = perf_session__new(output_name, O_WRONLY,
+				    rec->write_mode == WRITE_FORCE, false, NULL);
+	if (session == NULL) {
+		pr_err("Not enough memory for reading perf file header\n");
+		return -1;
+	}
+
+	rec->session = session;
+
+	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(&evsel_list->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->file_new) {
+		err = perf_session__read_header(session, output);
+		if (err < 0)
+			goto out_delete_session;
+	}
+
+	if (forks) {
+		err = perf_evlist__prepare_workload(evsel_list, &opts->target,
+						    argv, opts->pipe_output,
+						    true);
+		if (err < 0) {
+			pr_err("Couldn't run the workload!\n");
+			goto out_delete_session;
+		}
+	}
+
+	if (perf_record__open(rec) != 0) {
+		err = -1;
+		goto out_delete_session;
+	}
+
+	if (!evsel_list->nr_groups)
+		perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
+
+	/*
+	 * perf_session__delete(session) will be called at perf_record__exit()
+	 */
+	on_exit(perf_record__exit, rec);
+
+	if (opts->pipe_output) {
+		err = perf_header__write_pipe(output);
+		if (err < 0)
+			goto out_delete_session;
+	} else if (rec->file_new) {
+		err = perf_session__write_header(session, evsel_list,
+						 output, false);
+		if (err < 0)
+			goto out_delete_session;
+	}
+
+	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_delete_session;
+	}
+
+	rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
+
+	machine = &session->machines.host;
+
+	if (opts->pipe_output) {
+		err = perf_event__synthesize_attrs(tool, session,
+						   process_synthesized_event);
+		if (err < 0) {
+			pr_err("Couldn't synthesize attrs.\n");
+			goto out_delete_session;
+		}
+
+		err = perf_event__synthesize_event_types(tool, process_synthesized_event,
+							 machine);
+		if (err < 0) {
+			pr_err("Couldn't synthesize event_types.\n");
+			goto out_delete_session;
+		}
+
+		if (have_tracepoints(&evsel_list->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, output, evsel_list,
+								  process_synthesized_event);
+			if (err <= 0) {
+				pr_err("Couldn't record tracing data.\n");
+				goto out_delete_session;
+			}
+			advance_output(rec, err);
+		}
+	}
+
+	err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
+						 machine, "_text");
+	if (err < 0)
+		err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
+							 machine, "_stext");
+	if (err < 0)
+		pr_err("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);
+	if (err < 0)
+		pr_err("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);
+	}
+
+	if (perf_target__has_task(&opts->target))
+		err = perf_event__synthesize_thread_map(tool, evsel_list->threads,
+						  process_synthesized_event,
+						  machine);
+	else if (perf_target__has_cpu(&opts->target))
+		err = perf_event__synthesize_threads(tool, process_synthesized_event,
+					       machine);
+	else /* command specified */
+		err = 0;
+
+	if (err != 0)
+		goto out_delete_session;
+
+	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_delete_session;
+		}
+	}
+
+	/*
+	 * 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 (!perf_target__none(&opts->target))
+		perf_evlist__enable(evsel_list);
+
+	/*
+	 * Let the child rip
+	 */
+	if (forks)
+		perf_evlist__start_workload(evsel_list);
+
+	for (;;) {
+		int hits = rec->samples;
+
+		if (perf_record__mmap_read_all(rec) < 0) {
+			err = -1;
+			goto out_delete_session;
+		}
+
+		if (hits == rec->samples) {
+			if (done)
+				break;
+			err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
+			waking++;
+		}
+
+		/*
+		 * 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 && !perf_target__none(&opts->target)) {
+			perf_evlist__disable(evsel_list);
+			disabled = true;
+		}
+	}
+
+	if (quiet || signr == SIGUSR1)
+		return 0;
+
+	fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
+
+	/*
+	 * Approximate RIP event size: 24 bytes.
+	 */
+	fprintf(stderr,
+		"[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
+		(double)rec->bytes_written / 1024.0 / 1024.0,
+		output_name,
+		rec->bytes_written / 24);
+
+	return 0;
+
+out_delete_session:
+	perf_session__delete(session);
+	return err;
+}
+
+#define BRANCH_OPT(n, m) \
+	{ .name = n, .mode = (m) }
+
+#define BRANCH_END { .name = NULL }
+
+struct branch_mode {
+	const char *name;
+	int mode;
+};
+
+static const struct branch_mode branch_modes[] = {
+	BRANCH_OPT("u", PERF_SAMPLE_BRANCH_USER),
+	BRANCH_OPT("k", PERF_SAMPLE_BRANCH_KERNEL),
+	BRANCH_OPT("hv", PERF_SAMPLE_BRANCH_HV),
+	BRANCH_OPT("any", PERF_SAMPLE_BRANCH_ANY),
+	BRANCH_OPT("any_call", PERF_SAMPLE_BRANCH_ANY_CALL),
+	BRANCH_OPT("any_ret", PERF_SAMPLE_BRANCH_ANY_RETURN),
+	BRANCH_OPT("ind_call", PERF_SAMPLE_BRANCH_IND_CALL),
+	BRANCH_END
+};
+
+static int
+parse_branch_stack(const struct option *opt, const char *str, int unset)
+{
+#define ONLY_PLM \
+	(PERF_SAMPLE_BRANCH_USER	|\
+	 PERF_SAMPLE_BRANCH_KERNEL	|\
+	 PERF_SAMPLE_BRANCH_HV)
+
+	uint64_t *mode = (uint64_t *)opt->value;
+	const struct branch_mode *br;
+	char *s, *os = NULL, *p;
+	int ret = -1;
+
+	if (unset)
+		return 0;
+
+	/*
+	 * cannot set it twice, -b + --branch-filter for instance
+	 */
+	if (*mode)
+		return -1;
+
+	/* str may be NULL in case no arg is passed to -b */
+	if (str) {
+		/* because str is read-only */
+		s = os = strdup(str);
+		if (!s)
+			return -1;
+
+		for (;;) {
+			p = strchr(s, ',');
+			if (p)
+				*p = '\0';
+
+			for (br = branch_modes; br->name; br++) {
+				if (!strcasecmp(s, br->name))
+					break;
+			}
+			if (!br->name) {
+				ui__warning("unknown branch filter %s,"
+					    " check man page\n", s);
+				goto error;
+			}
+
+			*mode |= br->mode;
+
+			if (!p)
+				break;
+
+			s = p + 1;
+		}
+	}
+	ret = 0;
+
+	/* default to any branch */
+	if ((*mode & ~ONLY_PLM) == 0) {
+		*mode = PERF_SAMPLE_BRANCH_ANY;
+	}
+error:
+	free(os);
+	return ret;
+}
+
+#ifdef LIBUNWIND_SUPPORT
+static int get_stack_size(char *str, unsigned long *_size)
+{
+	char *endptr;
+	unsigned long size;
+	unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
+
+	size = strtoul(str, &endptr, 0);
+
+	do {
+		if (*endptr)
+			break;
+
+		size = round_up(size, sizeof(u64));
+		if (!size || size > max_size)
+			break;
+
+		*_size = size;
+		return 0;
+
+	} while (0);
+
+	pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
+	       max_size, str);
+	return -1;
+}
+#endif /* LIBUNWIND_SUPPORT */
+
+int record_parse_callchain_opt(const struct option *opt,
+			       const char *arg, int unset)
+{
+	struct perf_record_opts *opts = opt->value;
+	char *tok, *name, *saveptr = NULL;
+	char *buf;
+	int ret = -1;
+
+	/* --no-call-graph */
+	if (unset)
+		return 0;
+
+	/* We specified default option if none is provided. */
+	BUG_ON(!arg);
+
+	/* We need buffer that we know we can write to. */
+	buf = malloc(strlen(arg) + 1);
+	if (!buf)
+		return -ENOMEM;
+
+	strcpy(buf, arg);
+
+	tok = strtok_r((char *)buf, ",", &saveptr);
+	name = tok ? : (char *)buf;
+
+	do {
+		/* Framepointer style */
+		if (!strncmp(name, "fp", sizeof("fp"))) {
+			if (!strtok_r(NULL, ",", &saveptr)) {
+				opts->call_graph = CALLCHAIN_FP;
+				ret = 0;
+			} else
+				pr_err("callchain: No more arguments "
+				       "needed for -g fp\n");
+			break;
+
+#ifdef LIBUNWIND_SUPPORT
+		/* Dwarf style */
+		} else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
+			const unsigned long default_stack_dump_size = 8192;
+
+			ret = 0;
+			opts->call_graph = CALLCHAIN_DWARF;
+			opts->stack_dump_size = default_stack_dump_size;
+
+			tok = strtok_r(NULL, ",", &saveptr);
+			if (tok) {
+				unsigned long size = 0;
+
+				ret = get_stack_size(tok, &size);
+				opts->stack_dump_size = size;
+			}
+
+			if (!ret)
+				pr_debug("callchain: stack dump size %d\n",
+					 opts->stack_dump_size);
+#endif /* LIBUNWIND_SUPPORT */
+		} else {
+			pr_err("callchain: Unknown -g option "
+			       "value: %s\n", arg);
+			break;
+		}
+
+	} while (0);
+
+	free(buf);
+
+	if (!ret)
+		pr_debug("callchain: type %d\n", opts->call_graph);
+
+	return ret;
+}
+
+static const char * const record_usage[] = {
+	"perf record [<options>] [<command>]",
+	"perf record [<options>] -- <command> [<options>]",
+	NULL
+};
+
+/*
+ * XXX Ideally would be local to cmd_record() and passed to a perf_record__new
+ * because we need to have access to it in perf_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 perf_record record = {
+	.opts = {
+		.mmap_pages	     = UINT_MAX,
+		.user_freq	     = UINT_MAX,
+		.user_interval	     = ULLONG_MAX,
+		.freq		     = 4000,
+		.target		     = {
+			.uses_mmap   = true,
+		},
+	},
+	.write_mode = WRITE_FORCE,
+	.file_new   = true,
+};
+
+#define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
+
+#ifdef LIBUNWIND_SUPPORT
+const char record_callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
+#else
+const char record_callchain_help[] = CALLCHAIN_HELP "[fp]";
+#endif
+
+/*
+ * 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 perf_record_opts,
+ * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
+ * using pipes, etc.
+ */
+const 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_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('D', "no-delay", &record.opts.no_delay,
+		    "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_BOOLEAN('A', "append", &record.append_file,
+			    "append to the output file to do incremental profiling"),
+	OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
+		    "list of cpus to monitor"),
+	OPT_BOOLEAN('f', "force", &record.force,
+			"overwrite existing data file (deprecated)"),
+	OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
+	OPT_STRING('o', "output", &record.output_name, "file",
+		    "output file name"),
+	OPT_BOOLEAN('i', "no-inherit", &record.opts.no_inherit,
+		    "child tasks do not inherit counters"),
+	OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
+	OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
+		     "number of mmap data pages"),
+	OPT_BOOLEAN(0, "group", &record.opts.group,
+		    "put the counters into a counter group"),
+	OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
+			     "mode[,dump_size]", record_callchain_help,
+			     &record_parse_callchain_opt, "fp"),
+	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,
+		    "Sample addresses"),
+	OPT_BOOLEAN('T', "timestamp", &record.opts.sample_time, "Sample timestamps"),
+	OPT_BOOLEAN('P', "period", &record.opts.period, "Sample period"),
+	OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
+		    "don't sample"),
+	OPT_BOOLEAN('N', "no-buildid-cache", &record.no_buildid_cache,
+		    "do not update the buildid cache"),
+	OPT_BOOLEAN('B', "no-buildid", &record.no_buildid,
+		    "do not collect buildids in perf.data"),
+	OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
+		     "monitor event in cgroup name only",
+		     parse_cgroups),
+	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_END()
+};
+
+int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
+{
+	int err = -ENOMEM;
+	struct perf_evsel *pos;
+	struct perf_evlist *evsel_list;
+	struct perf_record *rec = &record;
+	char errbuf[BUFSIZ];
+
+	evsel_list = perf_evlist__new();
+	if (evsel_list == NULL)
+		return -ENOMEM;
+
+	rec->evlist = evsel_list;
+
+	argc = parse_options(argc, argv, record_options, record_usage,
+			    PARSE_OPT_STOP_AT_NON_OPTION);
+	if (!argc && perf_target__none(&rec->opts.target))
+		usage_with_options(record_usage, record_options);
+
+	if (rec->force && rec->append_file) {
+		ui__error("Can't overwrite and append at the same time."
+			  " You need to choose between -f and -A");
+		usage_with_options(record_usage, record_options);
+	} else if (rec->append_file) {
+		rec->write_mode = WRITE_APPEND;
+	} else {
+		rec->write_mode = WRITE_FORCE;
+	}
+
+	if (nr_cgroups && !rec->opts.target.system_wide) {
+		ui__error("cgroup monitoring only available in"
+			  " system-wide mode\n");
+		usage_with_options(record_usage, record_options);
+	}
+
+	symbol__init();
+
+	if (symbol_conf.kptr_restrict)
+		pr_warning(
+"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
+"check /proc/sys/kernel/kptr_restrict.\n\n"
+"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
+"file is not found in the buildid cache or in the vmlinux path.\n\n"
+"Samples in kernel modules won't be resolved at all.\n\n"
+"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
+"even with a suitable vmlinux or kallsyms file.\n\n");
+
+	if (rec->no_buildid_cache || rec->no_buildid)
+		disable_buildid_cache();
+
+	if (evsel_list->nr_entries == 0 &&
+	    perf_evlist__add_default(evsel_list) < 0) {
+		pr_err("Not enough memory for event selector list\n");
+		goto out_symbol_exit;
+	}
+
+	err = perf_target__validate(&rec->opts.target);
+	if (err) {
+		perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
+		ui__warning("%s", errbuf);
+	}
+
+	err = perf_target__parse_uid(&rec->opts.target);
+	if (err) {
+		int saved_errno = errno;
+
+		perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
+		ui__error("%s", errbuf);
+
+		err = -saved_errno;
+		goto out_symbol_exit;
+	}
+
+	err = -ENOMEM;
+	if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
+		usage_with_options(record_usage, record_options);
+
+	list_for_each_entry(pos, &evsel_list->entries, node) {
+		if (perf_header__push_event(pos->attr.config, perf_evsel__name(pos)))
+			goto out_free_fd;
+	}
+
+	if (rec->opts.user_interval != ULLONG_MAX)
+		rec->opts.default_interval = rec->opts.user_interval;
+	if (rec->opts.user_freq != UINT_MAX)
+		rec->opts.freq = rec->opts.user_freq;
+
+	/*
+	 * User specified count overrides default frequency.
+	 */
+	if (rec->opts.default_interval)
+		rec->opts.freq = 0;
+	else if (rec->opts.freq) {
+		rec->opts.default_interval = rec->opts.freq;
+	} else {
+		ui__error("frequency and count are zero, aborting\n");
+		err = -EINVAL;
+		goto out_free_fd;
+	}
+
+	err = __cmd_record(&record, argc, argv);
+
+	perf_evlist__munmap(evsel_list);
+	perf_evlist__close(evsel_list);
+out_free_fd:
+	perf_evlist__delete_maps(evsel_list);
+out_symbol_exit:
+	symbol__exit();
+	return err;
+}