text: // SPDX-License-Identifier: GPL-2.0
  /*
   * builtin-report.c
   *
   * Builtin report command: Analyze the perf.data input file,
   * look up and read DSOs and symbol information and display
   * a histogram of results, along various sorting keys.
   */
  #include "builtin.h"
  
  #include "util/util.h"
  #include "util/config.h"
  
  #include "util/annotate.h"
  #include "util/color.h"
  #include <linux/list.h>
  #include <linux/rbtree.h>
  #include <linux/err.h>
  #include "util/symbol.h"
  #include "util/callchain.h"
  #include "util/values.h"
  
  #include "perf.h"
  #include "util/debug.h"
  #include "util/evlist.h"
  #include "util/evsel.h"
  #include "util/header.h"
  #include "util/session.h"
  #include "util/tool.h"
  
  #include <subcmd/parse-options.h>
  #include <subcmd/exec-cmd.h>
  #include "util/parse-events.h"
  
  #include "util/thread.h"
  #include "util/sort.h"
  #include "util/hist.h"
  #include "util/data.h"
  #include "arch/common.h"
  #include "util/time-utils.h"
  #include "util/auxtrace.h"
  #include "util/units.h"
  #include "util/branch.h"
  
  #include <dlfcn.h>
  #include <errno.h>
  #include <inttypes.h>
  #include <regex.h>
  #include <signal.h>
  #include <linux/bitmap.h>
  #include <linux/stringify.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <unistd.h>
  #include <linux/mman.h>
  
  struct report {
  	struct perf_tool	tool;
  	struct perf_session	*session;
  	bool			use_tui, use_gtk, use_stdio;
  	bool			show_full_info;
  	bool			show_threads;
  	bool			inverted_callchain;
  	bool			mem_mode;
  	bool			stats_mode;
  	bool			tasks_mode;
  	bool			mmaps_mode;
  	bool			header;
  	bool			header_only;
  	bool			nonany_branch_mode;
  	bool			group_set;
  	int			max_stack;
  	struct perf_read_values	show_threads_values;
  	struct annotation_options annotation_opts;
  	const char		*pretty_printing_style;
  	const char		*cpu_list;
  	const char		*symbol_filter_str;
  	const char		*time_str;
  	struct perf_time_interval *ptime_range;
  	int			range_size;
  	int			range_num;
  	float			min_percent;
  	u64			nr_entries;
  	u64			queue_size;
  	int			socket_filter;
  	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
  	struct branch_type_stat	brtype_stat;
  };
  
  static int report__config(const char *var, const char *value, void *cb)
  {
  	struct report *rep = cb;
  
  	if (!strcmp(var, "report.group")) {
  		symbol_conf.event_group = perf_config_bool(var, value);
  		return 0;
  	}
  	if (!strcmp(var, "report.percent-limit")) {
  		double pcnt = strtof(value, NULL);
  
  		rep->min_percent = pcnt;
  		callchain_param.min_percent = pcnt;
  		return 0;
  	}
  	if (!strcmp(var, "report.children")) {
  		symbol_conf.cumulate_callchain = perf_config_bool(var, value);
  		return 0;
  	}
  	if (!strcmp(var, "report.queue-size"))
  		return perf_config_u64(&rep->queue_size, var, value);
  
  	if (!strcmp(var, "report.sort_order")) {
  		default_sort_order = strdup(value);
  		return 0;
  	}
  
  	return 0;
  }
  
  static int hist_iter__report_callback(struct hist_entry_iter *iter,
  				      struct addr_location *al, bool single,
  				      void *arg)
  {
  	int err = 0;
  	struct report *rep = arg;
  	struct hist_entry *he = iter->he;
  	struct perf_evsel *evsel = iter->evsel;
  	struct perf_sample *sample = iter->sample;
  	struct mem_info *mi;
  	struct branch_info *bi;
  
  	if (!ui__has_annotation())
  		return 0;
  
  	hist__account_cycles(sample->branch_stack, al, sample,
  			     rep->nonany_branch_mode);
  
  	if (sort__mode == SORT_MODE__BRANCH) {
  		bi = he->branch_info;
  		err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
  		if (err)
  			goto out;
  
  		err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
  
  	} else if (rep->mem_mode) {
  		mi = he->mem_info;
  		err = addr_map_symbol__inc_samples(&mi->daddr, sample, evsel);
  		if (err)
  			goto out;
  
  		err = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
  
  	} else if (symbol_conf.cumulate_callchain) {
  		if (single)
  			err = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
  	} else {
  		err = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
  	}
  
  out:
  	return err;
  }
  
  static int hist_iter__branch_callback(struct hist_entry_iter *iter,
  				      struct addr_location *al __maybe_unused,
  				      bool single __maybe_unused,
  				      void *arg)
  {
  	struct hist_entry *he = iter->he;
  	struct report *rep = arg;
  	struct branch_info *bi;
  	struct perf_sample *sample = iter->sample;
  	struct perf_evsel *evsel = iter->evsel;
  	int err;
  
  	if (!ui__has_annotation())
  		return 0;
  
  	hist__account_cycles(sample->branch_stack, al, sample,
  			     rep->nonany_branch_mode);
  
  	bi = he->branch_info;
  	err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
  	if (err)
  		goto out;
  
  	err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
  
  	branch_type_count(&rep->brtype_stat, &bi->flags,
  			  bi->from.addr, bi->to.addr);
  
  out:
  	return err;
  }
  
  static void setup_forced_leader(struct report *report,
  				struct perf_evlist *evlist)
  {
  	if (report->group_set)
  		perf_evlist__force_leader(evlist);
  }
  
  static int process_feature_event(struct perf_tool *tool,
  				 union perf_event *event,
  				 struct perf_session *session __maybe_unused)
  {
  	struct report *rep = container_of(tool, struct report, tool);
  
  	if (event->feat.feat_id < HEADER_LAST_FEATURE)
  		return perf_event__process_feature(tool, event, session);
  
  	if (event->feat.feat_id != HEADER_LAST_FEATURE) {
  		pr_err("failed: wrong feature ID: %" PRIu64 "\n",
  		       event->feat.feat_id);
  		return -1;
  	}
  
  	/*
  	 * All features are received, we can force the
  	 * group if needed.
  	 */
  	setup_forced_leader(rep, session->evlist);
  	return 0;
  }
  
  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 report *rep = container_of(tool, struct report, tool);
  	struct addr_location al;
  	struct hist_entry_iter iter = {
  		.evsel 			= evsel,
  		.sample 		= sample,
  		.hide_unresolved 	= symbol_conf.hide_unresolved,
  		.add_entry_cb 		= hist_iter__report_callback,
  	};
  	int ret = 0;
  
  	if (perf_time__ranges_skip_sample(rep->ptime_range, rep->range_num,
  					  sample->time)) {
  		return 0;
  	}
  
  	if (machine__resolve(machine, &al, sample) < 0) {
  		pr_debug("problem processing %d event, skipping it.\n",
  			 event->header.type);
  		return -1;
  	}
  
  	if (symbol_conf.hide_unresolved && al.sym == NULL)
  		goto out_put;
  
  	if (rep->cpu_list && !test_bit(sample->cpu, rep->cpu_bitmap))
  		goto out_put;
  
  	if (sort__mode == SORT_MODE__BRANCH) {
  		/*
  		 * A non-synthesized event might not have a branch stack if
  		 * branch stacks have been synthesized (using itrace options).
  		 */
  		if (!sample->branch_stack)
  			goto out_put;
  
  		iter.add_entry_cb = hist_iter__branch_callback;
  		iter.ops = &hist_iter_branch;
  	} else if (rep->mem_mode) {
  		iter.ops = &hist_iter_mem;
  	} else if (symbol_conf.cumulate_callchain) {
  		iter.ops = &hist_iter_cumulative;
  	} else {
  		iter.ops = &hist_iter_normal;
  	}
  
  	if (al.map != NULL)
  		al.map->dso->hit = 1;
  
  	ret = hist_entry_iter__add(&iter, &al, rep->max_stack, rep);
  	if (ret < 0)
  		pr_debug("problem adding hist entry, skipping event\n");
  out_put:
  	addr_location__put(&al);
  	return ret;
  }
  
  static int process_read_event(struct perf_tool *tool,
  			      union perf_event *event,
  			      struct perf_sample *sample __maybe_unused,
  			      struct perf_evsel *evsel,
  			      struct machine *machine __maybe_unused)
  {
  	struct report *rep = container_of(tool, struct report, tool);
  
  	if (rep->show_threads) {
  		const char *name = evsel ? perf_evsel__name(evsel) : "unknown";
  		int err = perf_read_values_add_value(&rep->show_threads_values,
  					   event->read.pid, event->read.tid,
  					   evsel->idx,
  					   name,
  					   event->read.value);
  
  		if (err)
  			return err;
  	}
  
  	return 0;
  }
  
  /* For pipe mode, sample_type is not currently set */
  static int report__setup_sample_type(struct report *rep)
  {
  	struct perf_session *session = rep->session;
  	u64 sample_type = perf_evlist__combined_sample_type(session->evlist);
  	bool is_pipe = perf_data__is_pipe(session->data);
  
  	if (session->itrace_synth_opts->callchain ||
  	    (!is_pipe &&
  	     perf_header__has_feat(&session->header, HEADER_AUXTRACE) &&
  	     !session->itrace_synth_opts->set))
  		sample_type |= PERF_SAMPLE_CALLCHAIN;
  
  	if (session->itrace_synth_opts->last_branch)
  		sample_type |= PERF_SAMPLE_BRANCH_STACK;
  
  	if (!is_pipe && !(sample_type & PERF_SAMPLE_CALLCHAIN)) {
  		if (perf_hpp_list.parent) {
  			ui__error("Selected --sort parent, but no "
  				    "callchain data. Did you call "
  				    "'perf record' without -g?\n");
  			return -EINVAL;
  		}
  		if (symbol_conf.use_callchain &&
  			!symbol_conf.show_branchflag_count) {
  			ui__error("Selected -g or --branch-history.\n"
  				  "But no callchain or branch data.\n"
  				  "Did you call 'perf record' without -g or -b?\n");
  			return -1;
  		}
  	} else if (!callchain_param.enabled &&
  		   callchain_param.mode != CHAIN_NONE &&
  		   !symbol_conf.use_callchain) {
  			symbol_conf.use_callchain = true;
  			if (callchain_register_param(&callchain_param) < 0) {
  				ui__error("Can't register callchain params.\n");
  				return -EINVAL;
  			}
  	}
  
  	if (symbol_conf.cumulate_callchain) {
  		/* Silently ignore if callchain is missing */
  		if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) {
  			symbol_conf.cumulate_callchain = false;
  			perf_hpp__cancel_cumulate();
  		}
  	}
  
  	if (sort__mode == SORT_MODE__BRANCH) {
  		if (!is_pipe &&
  		    !(sample_type & PERF_SAMPLE_BRANCH_STACK)) {
  			ui__error("Selected -b but no branch data. "
  				  "Did you call perf record without -b?\n");
  			return -1;
  		}
  	}
  
  	if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
  		if ((sample_type & PERF_SAMPLE_REGS_USER) &&
  		    (sample_type & PERF_SAMPLE_STACK_USER)) {
  			callchain_param.record_mode = CALLCHAIN_DWARF;
  			dwarf_callchain_users = true;
  		} else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
  			callchain_param.record_mode = CALLCHAIN_LBR;
  		else
  			callchain_param.record_mode = CALLCHAIN_FP;
  	}
  
  	/* ??? handle more cases than just ANY? */
  	if (!(perf_evlist__combined_branch_type(session->evlist) &
  				PERF_SAMPLE_BRANCH_ANY))
  		rep->nonany_branch_mode = true;
  
  	return 0;
  }
  
  static void sig_handler(int sig __maybe_unused)
  {
  	session_done = 1;
  }
  
  static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report *rep,
  					      const char *evname, FILE *fp)
  {
  	size_t ret;
  	char unit;
  	unsigned long nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
  	u64 nr_events = hists->stats.total_period;
  	struct perf_evsel *evsel = hists_to_evsel(hists);
  	char buf[512];
  	size_t size = sizeof(buf);
  	int socked_id = hists->socket_filter;
  
  	if (quiet)
  		return 0;
  
  	if (symbol_conf.filter_relative) {
  		nr_samples = hists->stats.nr_non_filtered_samples;
  		nr_events = hists->stats.total_non_filtered_period;
  	}
  
  	if (perf_evsel__is_group_event(evsel)) {
  		struct perf_evsel *pos;
  
  		perf_evsel__group_desc(evsel, buf, size);
  		evname = buf;
  
  		for_each_group_member(pos, evsel) {
  			const struct hists *pos_hists = evsel__hists(pos);
  
  			if (symbol_conf.filter_relative) {
  				nr_samples += pos_hists->stats.nr_non_filtered_samples;
  				nr_events += pos_hists->stats.total_non_filtered_period;
  			} else {
  				nr_samples += pos_hists->stats.nr_events[PERF_RECORD_SAMPLE];
  				nr_events += pos_hists->stats.total_period;
  			}
  		}
  	}
  
  	nr_samples = convert_unit(nr_samples, &unit);
  	ret = fprintf(fp, "# Samples: %lu%c", nr_samples, unit);
  	if (evname != NULL) {
  		ret += fprintf(fp, " of event%s '%s'",
  			       evsel->nr_members > 1 ? "s" : "", evname);
  	}
  
  	if (rep->time_str)
  		ret += fprintf(fp, " (time slices: %s)", rep->time_str);
  
  	if (symbol_conf.show_ref_callgraph &&
  	    strstr(evname, "call-graph=no")) {
  		ret += fprintf(fp, ", show reference callgraph");
  	}
  
  	if (rep->mem_mode) {
  		ret += fprintf(fp, "\n# Total weight : %" PRIu64, nr_events);
  		ret += fprintf(fp, "\n# Sort order   : %s", sort_order ? : default_mem_sort_order);
  	} else
  		ret += fprintf(fp, "\n# Event count (approx.): %" PRIu64, nr_events);
  
  	if (socked_id > -1)
  		ret += fprintf(fp, "\n# Processor Socket: %d", socked_id);
  
  	return ret + fprintf(fp, "\n#\n");
  }
  
  static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
  					 struct report *rep,
  					 const char *help)
  {
  	struct perf_evsel *pos;
  
  	if (!quiet) {
  		fprintf(stdout, "#\n# Total Lost Samples: %" PRIu64 "\n#\n",
  			evlist->stats.total_lost_samples);
  	}
  
  	evlist__for_each_entry(evlist, pos) {
  		struct hists *hists = evsel__hists(pos);
  		const char *evname = perf_evsel__name(pos);
  
  		if (symbol_conf.event_group &&
  		    !perf_evsel__is_group_leader(pos))
  			continue;
  
  		hists__fprintf_nr_sample_events(hists, rep, evname, stdout);
  		hists__fprintf(hists, !quiet, 0, 0, rep->min_percent, stdout,
  			       symbol_conf.use_callchain ||
  			       symbol_conf.show_branchflag_count);
  		fprintf(stdout, "\n\n");
  	}
  
  	if (!quiet)
  		fprintf(stdout, "#\n# (%s)\n#\n", help);
  
  	if (rep->show_threads) {
  		bool style = !strcmp(rep->pretty_printing_style, "raw");
  		perf_read_values_display(stdout, &rep->show_threads_values,
  					 style);
  		perf_read_values_destroy(&rep->show_threads_values);
  	}
  
  	if (sort__mode == SORT_MODE__BRANCH)
  		branch_type_stat_display(stdout, &rep->brtype_stat);
  
  	return 0;
  }
  
  static void report__warn_kptr_restrict(const struct report *rep)
  {
  	struct map *kernel_map = machine__kernel_map(&rep->session->machines.host);
  	struct kmap *kernel_kmap = kernel_map ? map__kmap(kernel_map) : NULL;
  
  	if (perf_evlist__exclude_kernel(rep->session->evlist))
  		return;
  
  	if (kernel_map == NULL ||
  	    (kernel_map->dso->hit &&
  	     (kernel_kmap->ref_reloc_sym == NULL ||
  	      kernel_kmap->ref_reloc_sym->addr == 0))) {
  		const char *desc =
  		    "As no suitable kallsyms nor vmlinux was found, kernel samples\n"
  		    "can't be resolved.";
  
  		if (kernel_map && map__has_symbols(kernel_map)) {
  			desc = "If some relocation was applied (e.g. "
  			       "kexec) symbols may be misresolved.";
  		}
  
  		ui__warning(
  "Kernel address maps (/proc/{kallsyms,modules}) were restricted.\n\n"
  "Check /proc/sys/kernel/kptr_restrict before running 'perf record'.\n\n%s\n\n"
  "Samples in kernel modules can't be resolved as well.\n\n",
  		desc);
  	}
  }
  
  static int report__gtk_browse_hists(struct report *rep, const char *help)
  {
  	int (*hist_browser)(struct perf_evlist *evlist, const char *help,
  			    struct hist_browser_timer *timer, float min_pcnt);
  
  	hist_browser = dlsym(perf_gtk_handle, "perf_evlist__gtk_browse_hists");
  
  	if (hist_browser == NULL) {
  		ui__error("GTK browser not found!\n");
  		return -1;
  	}
  
  	return hist_browser(rep->session->evlist, help, NULL, rep->min_percent);
  }
  
  static int report__browse_hists(struct report *rep)
  {
  	int ret;
  	struct perf_session *session = rep->session;
  	struct perf_evlist *evlist = session->evlist;
  	const char *help = perf_tip(system_path(TIPDIR));
  
  	if (help == NULL) {
  		/* fallback for people who don't install perf ;-) */
  		help = perf_tip(DOCDIR);
  		if (help == NULL)
  			help = "Cannot load tips.txt file, please install perf!";
  	}
  
  	switch (use_browser) {
  	case 1:
  		ret = perf_evlist__tui_browse_hists(evlist, help, NULL,
  						    rep->min_percent,
  						    &session->header.env,
  						    true, &rep->annotation_opts);
  		/*
  		 * Usually "ret" is the last pressed key, and we only
  		 * care if the key notifies us to switch data file.
  		 */
  		if (ret != K_SWITCH_INPUT_DATA)
  			ret = 0;
  		break;
  	case 2:
  		ret = report__gtk_browse_hists(rep, help);
  		break;
  	default:
  		ret = perf_evlist__tty_browse_hists(evlist, rep, help);
  		break;
  	}
  
  	return ret;
  }
  
  static int report__collapse_hists(struct report *rep)
  {
  	struct ui_progress prog;
  	struct perf_evsel *pos;
  	int ret = 0;
  
  	ui_progress__init(&prog, rep->nr_entries, "Merging related events...");
  
  	evlist__for_each_entry(rep->session->evlist, pos) {
  		struct hists *hists = evsel__hists(pos);
  
  		if (pos->idx == 0)
  			hists->symbol_filter_str = rep->symbol_filter_str;
  
  		hists->socket_filter = rep->socket_filter;
  
  		ret = hists__collapse_resort(hists, &prog);
  		if (ret < 0)
  			break;
  
  		/* Non-group events are considered as leader */
  		if (symbol_conf.event_group &&
  		    !perf_evsel__is_group_leader(pos)) {
  			struct hists *leader_hists = evsel__hists(pos->leader);
  
  			hists__match(leader_hists, hists);
  			hists__link(leader_hists, hists);
  		}
  	}
  
  	ui_progress__finish();
  	return ret;
  }
  
  static void report__output_resort(struct report *rep)
  {
  	struct ui_progress prog;
  	struct perf_evsel *pos;
  
  	ui_progress__init(&prog, rep->nr_entries, "Sorting events for output...");
  
  	evlist__for_each_entry(rep->session->evlist, pos)
  		perf_evsel__output_resort(pos, &prog);
  
  	ui_progress__finish();
  }
  
  static void stats_setup(struct report *rep)
  {
  	memset(&rep->tool, 0, sizeof(rep->tool));
  	rep->tool.no_warn = true;
  }
  
  static int stats_print(struct report *rep)
  {
  	struct perf_session *session = rep->session;
  
  	perf_session__fprintf_nr_events(session, stdout);
  	return 0;
  }
  
  static void tasks_setup(struct report *rep)
  {
  	memset(&rep->tool, 0, sizeof(rep->tool));
  	rep->tool.ordered_events = true;
  	if (rep->mmaps_mode) {
  		rep->tool.mmap = perf_event__process_mmap;
  		rep->tool.mmap2 = perf_event__process_mmap2;
  	}
  	rep->tool.comm = perf_event__process_comm;
  	rep->tool.exit = perf_event__process_exit;
  	rep->tool.fork = perf_event__process_fork;
  	rep->tool.no_warn = true;
  }
  
  struct task {
  	struct thread		*thread;
  	struct list_head	 list;
  	struct list_head	 children;
  };
  
  static struct task *tasks_list(struct task *task, struct machine *machine)
  {
  	struct thread *parent_thread, *thread = task->thread;
  	struct task   *parent_task;
  
  	/* Already listed. */
  	if (!list_empty(&task->list))
  		return NULL;
  
  	/* Last one in the chain. */
  	if (thread->ppid == -1)
  		return task;
  
  	parent_thread = machine__find_thread(machine, -1, thread->ppid);
  	if (!parent_thread)
  		return ERR_PTR(-ENOENT);
  
  	parent_task = thread__priv(parent_thread);
  	list_add_tail(&task->list, &parent_task->children);
  	return tasks_list(parent_task, machine);
  }
  
  static size_t maps__fprintf_task(struct maps *maps, int indent, FILE *fp)
  {
  	size_t printed = 0;
  	struct rb_node *nd;
  
  	for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
  		struct map *map = rb_entry(nd, struct map, rb_node);
  
  		printed += fprintf(fp, "%*s  %" PRIx64 "-%" PRIx64 " %c%c%c%c %08" PRIx64 " %" PRIu64 " %s\n",
  				   indent, "", map->start, map->end,
  				   map->prot & PROT_READ ? 'r' : '-',
  				   map->prot & PROT_WRITE ? 'w' : '-',
  				   map->prot & PROT_EXEC ? 'x' : '-',
  				   map->flags & MAP_SHARED ? 's' : 'p',
  				   map->pgoff,
  				   map->ino, map->dso->name);
  	}
  
  	return printed;
  }
  
  static int map_groups__fprintf_task(struct map_groups *mg, int indent, FILE *fp)
  {
  	return maps__fprintf_task(&mg->maps, indent, fp);
  }
  
  static void task__print_level(struct task *task, FILE *fp, int level)
  {
  	struct thread *thread = task->thread;
  	struct task *child;
  	int comm_indent = fprintf(fp, "  %8d %8d %8d |%*s",
  				  thread->pid_, thread->tid, thread->ppid,
  				  level, "");
  
  	fprintf(fp, "%s\n", thread__comm_str(thread));
  
  	map_groups__fprintf_task(thread->mg, comm_indent, fp);
  
  	if (!list_empty(&task->children)) {
  		list_for_each_entry(child, &task->children, list)
  			task__print_level(child, fp, level + 1);
  	}
  }
  
  static int tasks_print(struct report *rep, FILE *fp)
  {
  	struct perf_session *session = rep->session;
  	struct machine      *machine = &session->machines.host;
  	struct task *tasks, *task;
  	unsigned int nr = 0, itask = 0, i;
  	struct rb_node *nd;
  	LIST_HEAD(list);
  
  	/*
  	 * No locking needed while accessing machine->threads,
  	 * because --tasks is single threaded command.
  	 */
  
  	/* Count all the threads. */
  	for (i = 0; i < THREADS__TABLE_SIZE; i++)
  		nr += machine->threads[i].nr;
  
  	tasks = malloc(sizeof(*tasks) * nr);
  	if (!tasks)
  		return -ENOMEM;
  
  	for (i = 0; i < THREADS__TABLE_SIZE; i++) {
  		struct threads *threads = &machine->threads[i];
  
  		for (nd = rb_first(&threads->entries); nd; nd = rb_next(nd)) {
  			task = tasks + itask++;
  
  			task->thread = rb_entry(nd, struct thread, rb_node);
  			INIT_LIST_HEAD(&task->children);
  			INIT_LIST_HEAD(&task->list);
  			thread__set_priv(task->thread, task);
  		}
  	}
  
  	/*
  	 * Iterate every task down to the unprocessed parent
  	 * and link all in task children list. Task with no
  	 * parent is added into 'list'.
  	 */
  	for (itask = 0; itask < nr; itask++) {
  		task = tasks + itask;
  
  		if (!list_empty(&task->list))
  			continue;
  
  		task = tasks_list(task, machine);
  		if (IS_ERR(task)) {
  			pr_err("Error: failed to process tasks\n");
  			free(tasks);
  			return PTR_ERR(task);
  		}
  
  		if (task)
  			list_add_tail(&task->list, &list);
  	}
  
  	fprintf(fp, "# %8s %8s %8s  %s\n", "pid", "tid", "ppid", "comm");
  
  	list_for_each_entry(task, &list, list)
  		task__print_level(task, fp, 0);
  
  	free(tasks);
  	return 0;
  }
  
  static int __cmd_report(struct report *rep)
  {
  	int ret;
  	struct perf_session *session = rep->session;
  	struct perf_evsel *pos;
  	struct perf_data *data = session->data;
  
  	signal(SIGINT, sig_handler);
  
  	if (rep->cpu_list) {
  		ret = perf_session__cpu_bitmap(session, rep->cpu_list,
  					       rep->cpu_bitmap);
  		if (ret) {
  			ui__error("failed to set cpu bitmap\n");
  			return ret;
  		}
  		session->itrace_synth_opts->cpu_bitmap = rep->cpu_bitmap;
  	}
  
  	if (rep->show_threads) {
  		ret = perf_read_values_init(&rep->show_threads_values);
  		if (ret)
  			return ret;
  	}
  
  	ret = report__setup_sample_type(rep);
  	if (ret) {
  		/* report__setup_sample_type() already showed error message */
  		return ret;
  	}
  
  	if (rep->stats_mode)
  		stats_setup(rep);
  
  	if (rep->tasks_mode)
  		tasks_setup(rep);
  
  	ret = perf_session__process_events(session);
  	if (ret) {
  		ui__error("failed to process sample\n");
  		return ret;
  	}
  
  	if (rep->stats_mode)
  		return stats_print(rep);
  
  	if (rep->tasks_mode)
  		return tasks_print(rep, stdout);
  
  	report__warn_kptr_restrict(rep);
  
  	evlist__for_each_entry(session->evlist, pos)
  		rep->nr_entries += evsel__hists(pos)->nr_entries;
  
  	if (use_browser == 0) {
  		if (verbose > 3)
  			perf_session__fprintf(session, stdout);
  
  		if (verbose > 2)
  			perf_session__fprintf_dsos(session, stdout);
  
  		if (dump_trace) {
  			perf_session__fprintf_nr_events(session, stdout);
  			perf_evlist__fprintf_nr_events(session->evlist, stdout);
  			return 0;
  		}
  	}
  
  	ret = report__collapse_hists(rep);
  	if (ret) {
  		ui__error("failed to process hist entry\n");
  		return ret;
  	}
  
  	if (session_done())
  		return 0;
  
  	/*
  	 * recalculate number of entries after collapsing since it
  	 * might be changed during the collapse phase.
  	 */
  	rep->nr_entries = 0;
  	evlist__for_each_entry(session->evlist, pos)
  		rep->nr_entries += evsel__hists(pos)->nr_entries;
  
  	if (rep->nr_entries == 0) {
  		ui__error("The %s file has no samples!\n", data->file.path);
  		return 0;
  	}
  
  	report__output_resort(rep);
  
  	return report__browse_hists(rep);
  }
  
  static int
  report_parse_callchain_opt(const struct option *opt, const char *arg, int unset)
  {
  	struct callchain_param *callchain = opt->value;
  
  	callchain->enabled = !unset;
  	/*
  	 * --no-call-graph
  	 */
  	if (unset) {
  		symbol_conf.use_callchain = false;
  		callchain->mode = CHAIN_NONE;
  		return 0;
  	}
  
  	return parse_callchain_report_opt(arg);
  }
  
  int
  report_parse_ignore_callees_opt(const struct option *opt __maybe_unused,
  				const char *arg, int unset __maybe_unused)
  {
  	if (arg) {
  		int err = regcomp(&ignore_callees_regex, arg, REG_EXTENDED);
  		if (err) {
  			char buf[BUFSIZ];
  			regerror(err, &ignore_callees_regex, buf, sizeof(buf));
  			pr_err("Invalid --ignore-callees regex: %s\n%s", arg, buf);
  			return -1;
  		}
  		have_ignore_callees = 1;
  	}
  
  	return 0;
  }
  
  static int
  parse_branch_mode(const struct option *opt,
  		  const char *str __maybe_unused, int unset)
  {
  	int *branch_mode = opt->value;
  
  	*branch_mode = !unset;
  	return 0;
  }
  
  static int
  parse_percent_limit(const struct option *opt, const char *str,
  		    int unset __maybe_unused)
  {
  	struct report *rep = opt->value;
  	double pcnt = strtof(str, NULL);
  
  	rep->min_percent = pcnt;
  	callchain_param.min_percent = pcnt;
  	return 0;
  }
  
  int cmd_report(int argc, const char **argv)
  {
  	struct perf_session *session;
  	struct itrace_synth_opts itrace_synth_opts = { .set = 0, };
  	struct stat st;
  	bool has_br_stack = false;
  	int branch_mode = -1;
  	bool branch_call_mode = false;
  #define CALLCHAIN_DEFAULT_OPT  "graph,0.5,caller,function,percent"
  	const char report_callchain_help[] = "Display call graph (stack chain/backtrace):\n\n"
  					     CALLCHAIN_REPORT_HELP
  					     "\n\t\t\t\tDefault: " CALLCHAIN_DEFAULT_OPT;
  	char callchain_default_opt[] = CALLCHAIN_DEFAULT_OPT;
  	const char * const report_usage[] = {
  		"perf report [<options>]",
  		NULL
  	};
  	struct report report = {
  		.tool = {
  			.sample		 = process_sample_event,
  			.mmap		 = perf_event__process_mmap,
  			.mmap2		 = perf_event__process_mmap2,
  			.comm		 = perf_event__process_comm,
  			.namespaces	 = perf_event__process_namespaces,
  			.exit		 = perf_event__process_exit,
  			.fork		 = perf_event__process_fork,
  			.lost		 = perf_event__process_lost,
  			.read		 = process_read_event,
  			.attr		 = perf_event__process_attr,
  			.tracing_data	 = perf_event__process_tracing_data,
  			.build_id	 = perf_event__process_build_id,
  			.id_index	 = perf_event__process_id_index,
  			.auxtrace_info	 = perf_event__process_auxtrace_info,
  			.auxtrace	 = perf_event__process_auxtrace,
  			.feature	 = process_feature_event,
  			.ordered_events	 = true,
  			.ordering_requires_timestamps = true,
  		},
  		.max_stack		 = PERF_MAX_STACK_DEPTH,
  		.pretty_printing_style	 = "normal",
  		.socket_filter		 = -1,
  		.annotation_opts	 = annotation__default_options,
  	};
  	const struct option options[] = {
  	OPT_STRING('i', "input", &input_name, "file",
  		    "input file name"),
  	OPT_INCR('v', "verbose", &verbose,
  		    "be more verbose (show symbol address, etc)"),
  	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
  	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
  		    "dump raw trace in ASCII"),
  	OPT_BOOLEAN(0, "stats", &report.stats_mode, "Display event stats"),
  	OPT_BOOLEAN(0, "tasks", &report.tasks_mode, "Display recorded tasks"),
  	OPT_BOOLEAN(0, "mmaps", &report.mmaps_mode, "Display recorded tasks memory maps"),
  	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
  		   "file", "vmlinux pathname"),
  	OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
                      "don't load vmlinux even if found"),
  	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
  		   "file", "kallsyms pathname"),
  	OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
  	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
  		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
  	OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
  		    "Show a column with the number of samples"),
  	OPT_BOOLEAN('T', "threads", &report.show_threads,
  		    "Show per-thread event counters"),
  	OPT_STRING(0, "pretty", &report.pretty_printing_style, "key",
  		   "pretty printing style key: normal raw"),
  	OPT_BOOLEAN(0, "tui", &report.use_tui, "Use the TUI interface"),
  	OPT_BOOLEAN(0, "gtk", &report.use_gtk, "Use the GTK2 interface"),
  	OPT_BOOLEAN(0, "stdio", &report.use_stdio,
  		    "Use the stdio interface"),
  	OPT_BOOLEAN(0, "header", &report.header, "Show data header."),
  	OPT_BOOLEAN(0, "header-only", &report.header_only,
  		    "Show only data header."),
  	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
  		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
  		   " Please refer the man page for the complete list."),
  	OPT_STRING('F', "fields", &field_order, "key[,keys...]",
  		   "output field(s): overhead, period, sample plus all of sort keys"),
  	OPT_BOOLEAN(0, "show-cpu-utilization", &symbol_conf.show_cpu_utilization,
  		    "Show sample percentage for different cpu modes"),
  	OPT_BOOLEAN_FLAG(0, "showcpuutilization", &symbol_conf.show_cpu_utilization,
  		    "Show sample percentage for different cpu modes", PARSE_OPT_HIDDEN),
  	OPT_STRING('p', "parent", &parent_pattern, "regex",
  		   "regex filter to identify parent, see: '--sort parent'"),
  	OPT_BOOLEAN('x', "exclude-other", &symbol_conf.exclude_other,
  		    "Only display entries with parent-match"),
  	OPT_CALLBACK_DEFAULT('g', "call-graph", &callchain_param,
  			     "print_type,threshold[,print_limit],order,sort_key[,branch],value",
  			     report_callchain_help, &report_parse_callchain_opt,
  			     callchain_default_opt),
  	OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
  		    "Accumulate callchains of children and show total overhead as well"),
  	OPT_INTEGER(0, "max-stack", &report.max_stack,
  		    "Set the maximum stack depth when parsing the callchain, "
  		    "anything beyond the specified depth will be ignored. "
  		    "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
  	OPT_BOOLEAN('G', "inverted", &report.inverted_callchain,
  		    "alias for inverted call graph"),
  	OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
  		   "ignore callees of these functions in call graphs",
  		   report_parse_ignore_callees_opt),
  	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
  		   "only consider symbols in these dsos"),
  	OPT_STRING('c', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
  		   "only consider symbols in these comms"),
  	OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
  		   "only consider symbols in these pids"),
  	OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
  		   "only consider symbols in these tids"),
  	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
  		   "only consider these symbols"),
  	OPT_STRING(0, "symbol-filter", &report.symbol_filter_str, "filter",
  		   "only show symbols that (partially) match with this filter"),
  	OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
  		   "width[,width...]",
  		   "don't try to adjust column width, use these fixed values"),
  	OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
  		   "separator for columns, no spaces will be added between "
  		   "columns '.' is reserved."),
  	OPT_BOOLEAN('U', "hide-unresolved", &symbol_conf.hide_unresolved,
  		    "Only display entries resolved to a symbol"),
  	OPT_CALLBACK(0, "symfs", NULL, "directory",
  		     "Look for files with symbols relative to this directory",
  		     symbol__config_symfs),
  	OPT_STRING('C', "cpu", &report.cpu_list, "cpu",
  		   "list of cpus to profile"),
  	OPT_BOOLEAN('I', "show-info", &report.show_full_info,
  		    "Display extended information about perf.data file"),
  	OPT_BOOLEAN(0, "source", &report.annotation_opts.annotate_src,
  		    "Interleave source code with assembly code (default)"),
  	OPT_BOOLEAN(0, "asm-raw", &report.annotation_opts.show_asm_raw,
  		    "Display raw encoding of assembly instructions (default)"),
  	OPT_STRING('M', "disassembler-style", &report.annotation_opts.disassembler_style, "disassembler style",
  		   "Specify disassembler style (e.g. -M intel for intel syntax)"),
  	OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
  		    "Show a column with the sum of periods"),
  	OPT_BOOLEAN_SET(0, "group", &symbol_conf.event_group, &report.group_set,
  		    "Show event group information together"),
  	OPT_CALLBACK_NOOPT('b', "branch-stack", &branch_mode, "",
  		    "use branch records for per branch histogram filling",
  		    parse_branch_mode),
  	OPT_BOOLEAN(0, "branch-history", &branch_call_mode,
  		    "add last branch records to call history"),
  	OPT_STRING(0, "objdump", &report.annotation_opts.objdump_path, "path",
  		   "objdump binary to use for disassembly and annotations"),
  	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
  		    "Disable symbol demangling"),
  	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
  		    "Enable kernel symbol demangling"),
  	OPT_BOOLEAN(0, "mem-mode", &report.mem_mode, "mem access profile"),
  	OPT_CALLBACK(0, "percent-limit", &report, "percent",
  		     "Don't show entries under that percent", parse_percent_limit),
  	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
  		     "how to display percentage of filtered entries", parse_filter_percentage),
  	OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
  			    "Instruction Tracing options",
  			    itrace_parse_synth_opts),
  	OPT_BOOLEAN(0, "full-source-path", &srcline_full_filename,
  			"Show full source file name path for source lines"),
  	OPT_BOOLEAN(0, "show-ref-call-graph", &symbol_conf.show_ref_callgraph,
  		    "Show callgraph from reference event"),
  	OPT_INTEGER(0, "socket-filter", &report.socket_filter,
  		    "only show processor socket that match with this filter"),
  	OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
  		    "Show raw trace event output (do not use print fmt or plugins)"),
  	OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
  		    "Show entries in a hierarchy"),
  	OPT_CALLBACK_DEFAULT(0, "stdio-color", NULL, "mode",
  			     "'always' (default), 'never' or 'auto' only applicable to --stdio mode",
  			     stdio__config_color, "always"),
  	OPT_STRING(0, "time", &report.time_str, "str",
  		   "Time span of interest (start,stop)"),
  	OPT_BOOLEAN(0, "inline", &symbol_conf.inline_name,
  		    "Show inline function"),
  	OPT_END()
  	};
  	struct perf_data data = {
  		.mode  = PERF_DATA_MODE_READ,
  	};
  	int ret = hists__init();
  
  	if (ret < 0)
  		return ret;
  
  	ret = perf_config(report__config, &report);
  	if (ret)
  		return ret;
  
  	argc = parse_options(argc, argv, options, report_usage, 0);
  	if (argc) {
  		/*
  		 * Special case: if there's an argument left then assume that
  		 * it's a symbol filter:
  		 */
  		if (argc > 1)
  			usage_with_options(report_usage, options);
  
  		report.symbol_filter_str = argv[0];
  	}
  
  	if (report.mmaps_mode)
  		report.tasks_mode = true;
  
  	if (quiet)
  		perf_quiet_option();
  
  	if (symbol_conf.vmlinux_name &&
  	    access(symbol_conf.vmlinux_name, R_OK)) {
  		pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name);
  		return -EINVAL;
  	}
  	if (symbol_conf.kallsyms_name &&
  	    access(symbol_conf.kallsyms_name, R_OK)) {
  		pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name);
  		return -EINVAL;
  	}
  
  	if (report.inverted_callchain)
  		callchain_param.order = ORDER_CALLER;
  	if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
  		callchain_param.order = ORDER_CALLER;
  
  	if (itrace_synth_opts.callchain &&
  	    (int)itrace_synth_opts.callchain_sz > report.max_stack)
  		report.max_stack = itrace_synth_opts.callchain_sz;
  
  	if (!input_name || !strlen(input_name)) {
  		if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
  			input_name = "-";
  		else
  			input_name = "perf.data";
  	}
  
  	data.file.path = input_name;
  	data.force     = symbol_conf.force;
  
  repeat:
  	session = perf_session__new(&data, false, &report.tool);
  	if (session == NULL)
  		return -1;
  
  	if (report.queue_size) {
  		ordered_events__set_alloc_size(&session->ordered_events,
  					       report.queue_size);
  	}
  
  	session->itrace_synth_opts = &itrace_synth_opts;
  
  	report.session = session;
  
  	has_br_stack = perf_header__has_feat(&session->header,
  					     HEADER_BRANCH_STACK);
  
  	setup_forced_leader(&report, session->evlist);
  
  	if (itrace_synth_opts.last_branch)
  		has_br_stack = true;
  
  	if (has_br_stack && branch_call_mode)
  		symbol_conf.show_branchflag_count = true;
  
  	memset(&report.brtype_stat, 0, sizeof(struct branch_type_stat));
  
  	/*
  	 * Branch mode is a tristate:
  	 * -1 means default, so decide based on the file having branch data.
  	 * 0/1 means the user chose a mode.
  	 */
  	if (((branch_mode == -1 && has_br_stack) || branch_mode == 1) &&
  	    !branch_call_mode) {
  		sort__mode = SORT_MODE__BRANCH;
  		symbol_conf.cumulate_callchain = false;
  	}
  	if (branch_call_mode) {
  		callchain_param.key = CCKEY_ADDRESS;
  		callchain_param.branch_callstack = 1;
  		symbol_conf.use_callchain = true;
  		callchain_register_param(&callchain_param);
  		if (sort_order == NULL)
  			sort_order = "srcline,symbol,dso";
  	}
  
  	if (report.mem_mode) {
  		if (sort__mode == SORT_MODE__BRANCH) {
  			pr_err("branch and mem mode incompatible\n");
  			goto error;
  		}
  		sort__mode = SORT_MODE__MEMORY;
  		symbol_conf.cumulate_callchain = false;
  	}
  
  	if (symbol_conf.report_hierarchy) {
  		/* disable incompatible options */
  		symbol_conf.cumulate_callchain = false;
  
  		if (field_order) {
  			pr_err("Error: --hierarchy and --fields options cannot be used together\n");
  			parse_options_usage(report_usage, options, "F", 1);
  			parse_options_usage(NULL, options, "hierarchy", 0);
  			goto error;
  		}
  
  		perf_hpp_list.need_collapse = true;
  	}
  
  	if (report.use_stdio)
  		use_browser = 0;
  	else if (report.use_tui)
  		use_browser = 1;
  	else if (report.use_gtk)
  		use_browser = 2;
  
  	/* Force tty output for header output and per-thread stat. */
  	if (report.header || report.header_only || report.show_threads)
  		use_browser = 0;
  	if (report.header || report.header_only)
  		report.tool.show_feat_hdr = SHOW_FEAT_HEADER;
  	if (report.show_full_info)
  		report.tool.show_feat_hdr = SHOW_FEAT_HEADER_FULL_INFO;
  	if (report.stats_mode || report.tasks_mode)
  		use_browser = 0;
  	if (report.stats_mode && report.tasks_mode) {
  		pr_err("Error: --tasks and --mmaps can't be used together with --stats\n");
  		goto error;
  	}
  
  	if (strcmp(input_name, "-") != 0)
  		setup_browser(true);
  	else
  		use_browser = 0;
  
  	if (setup_sorting(session->evlist) < 0) {
  		if (sort_order)
  			parse_options_usage(report_usage, options, "s", 1);
  		if (field_order)
  			parse_options_usage(sort_order ? NULL : report_usage,
  					    options, "F", 1);
  		goto error;
  	}
  
  	if ((report.header || report.header_only) && !quiet) {
  		perf_session__fprintf_info(session, stdout,
  					   report.show_full_info);
  		if (report.header_only) {
  			ret = 0;
  			goto error;
  		}
  	} else if (use_browser == 0 && !quiet &&
  		   !report.stats_mode && !report.tasks_mode) {
  		fputs("# To display the perf.data header info, please use --header/--header-only options.\n#\n",
  		      stdout);
  	}
  
  	/*
  	 * Only in the TUI browser we are doing integrated annotation,
  	 * so don't allocate extra space that won't be used in the stdio
  	 * implementation.
  	 */
  	if (ui__has_annotation()) {
  		ret = symbol__annotation_init();
  		if (ret < 0)
  			goto error;
  		/*
   		 * For searching by name on the "Browse map details".
   		 * providing it only in verbose mode not to bloat too
   		 * much struct symbol.
   		 */
  		if (verbose > 0) {
  			/*
  			 * XXX: Need to provide a less kludgy way to ask for
  			 * more space per symbol, the u32 is for the index on
  			 * the ui browser.
  			 * See symbol__browser_index.
  			 */
  			symbol_conf.priv_size += sizeof(u32);
  			symbol_conf.sort_by_name = true;
  		}
  		annotation_config__init();
  	}
  
  	if (symbol__init(&session->header.env) < 0)
  		goto error;
  
  	report.ptime_range = perf_time__range_alloc(report.time_str,
  						    &report.range_size);
  	if (!report.ptime_range) {
  		ret = -ENOMEM;
  		goto error;
  	}
  
  	if (perf_time__parse_str(report.ptime_range, report.time_str) != 0) {
  		if (session->evlist->first_sample_time == 0 &&
  		    session->evlist->last_sample_time == 0) {
  			pr_err("HINT: no first/last sample time found in perf data.\n"
  			       "Please use latest perf binary to execute 'perf record'\n"
  			       "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n");
  			ret = -EINVAL;
  			goto error;
  		}
  
  		report.range_num = perf_time__percent_parse_str(
  					report.ptime_range, report.range_size,
  					report.time_str,
  					session->evlist->first_sample_time,
  					session->evlist->last_sample_time);
  
  		if (report.range_num < 0) {
  			pr_err("Invalid time string\n");
  			ret = -EINVAL;
  			goto error;
  		}
  	} else {
  		report.range_num = 1;
  	}
  
  	if (session->tevent.pevent &&
  	    pevent_set_function_resolver(session->tevent.pevent,
  					 machine__resolve_kernel_addr,
  					 &session->machines.host) < 0) {
  		pr_err("%s: failed to set libtraceevent function resolver\n",
  		       __func__);
  		return -1;
  	}
  
  	sort__setup_elide(stdout);
  
  	ret = __cmd_report(&report);
  	if (ret == K_SWITCH_INPUT_DATA) {
  		perf_session__delete(session);
  		goto repeat;
  	} else
  		ret = 0;
  
  error:
  	zfree(&report.ptime_range);
  
  	perf_session__delete(session);
  	return ret;
  }
  