tools/perf/builtin-report.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/annotate.h"
 #include "util/color.h"
 #include <linux/list.h>
 #include "util/cache.h"
 #include <linux/rbtree.h>
 #include "util/symbol.h"
 #include "util/callchain.h"
 #include "util/strlist.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/parse-options.h"
 #include "util/parse-events.h"

 #include "util/thread.h"
 #include "util/sort.h"
 #include "util/hist.h"

 static char		const *input_name = "perf.data";

 static bool		force, use_tui, use_stdio;
 static bool		hide_unresolved;
 static bool		dont_use_callchains;

 static bool		show_threads;
 static struct perf_read_values	show_threads_values;

 static const char	default_pretty_printing_style[] = "normal";
 static const char	*pretty_printing_style = default_pretty_printing_style;

 static char		callchain_default_opt[] = "fractal,0.5,callee";
 static bool		inverted_callchain;
 static symbol_filter_t	annotate_init;

 static int perf_session__add_hist_entry(struct perf_session *session,
 					struct addr_location *al,
 					struct perf_sample *sample,
 					struct perf_evsel *evsel)
 {
 	struct symbol *parent = NULL;
 	int err = 0;
 	struct hist_entry *he;

 	if ((sort__has_parent || symbol_conf.use_callchain) && sample->callchain) {
 		err = perf_session__resolve_callchain(session, al->thread,
 						      sample->callchain, &parent);
 		if (err)
 			return err;
 	}

 	he = __hists__add_entry(&evsel->hists, al, parent, sample->period);
 	if (he == NULL)
 		return -ENOMEM;

 	if (symbol_conf.use_callchain) {
 		err = callchain_append(he->callchain, &session->callchain_cursor,
 				       sample->period);
 		if (err)
 			return err;
 	}
 	/*
 	 * Only in the newt browser we are doing integrated annotation,
 	 * so we don't allocated the extra space needed because the stdio
 	 * code will not use it.
 	 */
 	if (al->sym != NULL && use_browser > 0) {
 		struct annotation *notes = symbol__annotation(he->ms.sym);

 		assert(evsel != NULL);

 		err = -ENOMEM;
 		if (notes->src == NULL &&
 		    symbol__alloc_hist(he->ms.sym, session->evlist->nr_entries) < 0)
 			goto out;

 		err = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
 	}

 	evsel->hists.stats.total_period += sample->period;
 	hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
 out:
 	return err;
 }


 static int process_sample_event(union perf_event *event,
 				struct perf_sample *sample,
 				struct perf_evsel *evsel,
 				struct perf_session *session)
 {
 	struct addr_location al;

 	if (perf_event__preprocess_sample(event, session, &al, sample,
 					  annotate_init) < 0) {
 		fprintf(stderr, "problem processing %d event, skipping it.\n",
 			event->header.type);
 		return -1;
 	}

 	if (al.filtered || (hide_unresolved && al.sym == NULL))
 		return 0;

 	if (al.map != NULL)
 		al.map->dso->hit = 1;

 	if (perf_session__add_hist_entry(session, &al, sample, evsel)) {
 		pr_debug("problem incrementing symbol period, skipping event\n");
 		return -1;
 	}

 	return 0;
 }

 static int process_read_event(union perf_event *event,
 			      struct perf_sample *sample __used,
 			      struct perf_session *session)
 {
 	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist,
 							 event->read.id);
 	if (show_threads) {
 		const char *name = evsel ? event_name(evsel) : "unknown";
 		perf_read_values_add_value(&show_threads_values,
 					   event->read.pid, event->read.tid,
 					   event->read.id,
 					   name,
 					   event->read.value);
 	}

 	dump_printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid,
 		    evsel ? event_name(evsel) : "FAIL",
 		    event->read.value);

 	return 0;
 }

 static int perf_session__setup_sample_type(struct perf_session *self)
 {
 	if (!(self->sample_type & PERF_SAMPLE_CALLCHAIN)) {
 		if (sort__has_parent) {
 			fprintf(stderr, "selected --sort parent, but no"
 					" callchain data. Did you call"
 					" perf record without -g?\n");
 			return -EINVAL;
 		}
 		if (symbol_conf.use_callchain) {
 			fprintf(stderr, "selected -g but no callchain data."
 					" Did you call perf record without"
 					" -g?\n");
 			return -1;
 		}
 	} else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE &&
 		   !symbol_conf.use_callchain) {
 			symbol_conf.use_callchain = true;
 			if (callchain_register_param(&callchain_param) < 0) {
 				fprintf(stderr, "Can't register callchain"
 						" params\n");
 				return -EINVAL;
 			}
 	}

 	return 0;
 }

 static struct perf_event_ops event_ops = {
 	.sample		 = process_sample_event,
 	.mmap		 = perf_event__process_mmap,
 	.comm		 = perf_event__process_comm,
 	.exit		 = perf_event__process_task,
 	.fork		 = perf_event__process_task,
 	.lost		 = perf_event__process_lost,
 	.read		 = process_read_event,
 	.attr		 = perf_event__process_attr,
 	.event_type	 = perf_event__process_event_type,
 	.tracing_data	 = perf_event__process_tracing_data,
 	.build_id	 = perf_event__process_build_id,
 	.ordered_samples = true,
 	.ordering_requires_timestamps = true,
 };

 extern volatile int session_done;

 static void sig_handler(int sig __used)
 {
 	session_done = 1;
 }

 static size_t hists__fprintf_nr_sample_events(struct hists *self,
 					      const char *evname, FILE *fp)
 {
 	size_t ret;
 	char unit;
 	unsigned long nr_events = self->stats.nr_events[PERF_RECORD_SAMPLE];

 	nr_events = convert_unit(nr_events, &unit);
 	ret = fprintf(fp, "# Events: %lu%c", nr_events, unit);
 	if (evname != NULL)
 		ret += fprintf(fp, " %s", evname);
 	return ret + fprintf(fp, "\n#\n");
 }

 static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
 					 const char *help)
 {
 	struct perf_evsel *pos;

 	list_for_each_entry(pos, &evlist->entries, node) {
 		struct hists *hists = &pos->hists;
 		const char *evname = NULL;

 		if (rb_first(&hists->entries) != rb_last(&hists->entries))
 			evname = event_name(pos);

 		hists__fprintf_nr_sample_events(hists, evname, stdout);
 		hists__fprintf(hists, NULL, false, stdout);
 		fprintf(stdout, "\n\n");
 	}

 	if (sort_order == default_sort_order &&
 	    parent_pattern == default_parent_pattern) {
 		fprintf(stdout, "#\n# (%s)\n#\n", help);

 		if (show_threads) {
 			bool style = !strcmp(pretty_printing_style, "raw");
 			perf_read_values_display(stdout, &show_threads_values,
 						 style);
 			perf_read_values_destroy(&show_threads_values);
 		}
 	}

 	return 0;
 }

 static int __cmd_report(void)
 {
 	int ret = -EINVAL;
 	u64 nr_samples;
 	struct perf_session *session;
 	struct perf_evsel *pos;
 	struct map *kernel_map;
 	struct kmap *kernel_kmap;
 	const char *help = "For a higher level overview, try: perf report --sort comm,dso";

 	signal(SIGINT, sig_handler);

 	session = perf_session__new(input_name, O_RDONLY, force, false, &event_ops);
 	if (session == NULL)
 		return -ENOMEM;

 	if (show_threads)
 		perf_read_values_init(&show_threads_values);

 	ret = perf_session__setup_sample_type(session);
 	if (ret)
 		goto out_delete;

 	ret = perf_session__process_events(session, &event_ops);
 	if (ret)
 		goto out_delete;

 	kernel_map = session->host_machine.vmlinux_maps[MAP__FUNCTION];
 	kernel_kmap = map__kmap(kernel_map);
 	if (kernel_map == NULL ||
 	    (kernel_map->dso->hit &&
 	     (kernel_kmap->ref_reloc_sym == NULL ||
 	      kernel_kmap->ref_reloc_sym->addr == 0))) {
 		const struct dso *kdso = kernel_map->dso;

 		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",
 			    RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION]) ?
 "As no suitable kallsyms nor vmlinux was found, kernel samples\n"
 "can't be resolved." :
 "If some relocation was applied (e.g. kexec) symbols may be misresolved.");
 	}

 	if (dump_trace) {
 		perf_session__fprintf_nr_events(session, stdout);
 		goto out_delete;
 	}

 	if (verbose > 3)
 		perf_session__fprintf(session, stdout);

 	if (verbose > 2)
 		perf_session__fprintf_dsos(session, stdout);

 	nr_samples = 0;
 	list_for_each_entry(pos, &session->evlist->entries, node) {
 		struct hists *hists = &pos->hists;

 		hists__collapse_resort(hists);
 		hists__output_resort(hists);
 		nr_samples += hists->stats.nr_events[PERF_RECORD_SAMPLE];
 	}

 	if (nr_samples == 0) {
 		ui__warning("The %s file has no samples!\n", input_name);
 		goto out_delete;
 	}

 	if (use_browser > 0)
 		perf_evlist__tui_browse_hists(session->evlist, help);
 	else
 		perf_evlist__tty_browse_hists(session->evlist, help);

 out_delete:
 	/*
 	 * Speed up the exit process, for large files this can
 	 * take quite a while.
 	 *
 	 * XXX Enable this when using valgrind or if we ever
 	 * librarize this command.
 	 *
 	 * Also experiment with obstacks to see how much speed
 	 * up we'll get here.
 	 *
  	 * perf_session__delete(session);
  	 */
 	return ret;
 }

 static int
 parse_callchain_opt(const struct option *opt __used, const char *arg,
 		    int unset)
 {
 	char *tok, *tok2;
 	char *endptr;

 	/*
 	 * --no-call-graph
 	 */
 	if (unset) {
 		dont_use_callchains = true;
 		return 0;
 	}

 	symbol_conf.use_callchain = true;

 	if (!arg)
 		return 0;

 	tok = strtok((char *)arg, ",");
 	if (!tok)
 		return -1;

 	/* get the output mode */
 	if (!strncmp(tok, "graph", strlen(arg)))
 		callchain_param.mode = CHAIN_GRAPH_ABS;

 	else if (!strncmp(tok, "flat", strlen(arg)))
 		callchain_param.mode = CHAIN_FLAT;

 	else if (!strncmp(tok, "fractal", strlen(arg)))
 		callchain_param.mode = CHAIN_GRAPH_REL;

 	else if (!strncmp(tok, "none", strlen(arg))) {
 		callchain_param.mode = CHAIN_NONE;
 		symbol_conf.use_callchain = false;

 		return 0;
 	}

 	else
 		return -1;

 	/* get the min percentage */
 	tok = strtok(NULL, ",");
 	if (!tok)
 		goto setup;

 	callchain_param.min_percent = strtod(tok, &endptr);
 	if (tok == endptr)
 		return -1;

 	/* get the print limit */
 	tok2 = strtok(NULL, ",");
 	if (!tok2)
 		goto setup;

 	if (tok2[0] != 'c') {
 		callchain_param.print_limit = strtod(tok2, &endptr);
 		tok2 = strtok(NULL, ",");
 		if (!tok2)
 			goto setup;
 	}

 	/* get the call chain order */
 	if (!strcmp(tok2, "caller"))
 		callchain_param.order = ORDER_CALLER;
 	else if (!strcmp(tok2, "callee"))
 		callchain_param.order = ORDER_CALLEE;
 	else
 		return -1;
 setup:
 	if (callchain_register_param(&callchain_param) < 0) {
 		fprintf(stderr, "Can't register callchain params\n");
 		return -1;
 	}
 	return 0;
 }

 static const char * const report_usage[] = {
 	"perf report [<options>] <command>",
 	NULL
 };

 static 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('D', "dump-raw-trace", &dump_trace,
 		    "dump raw trace in ASCII"),
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
 	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 		   "file", "kallsyms pathname"),
 	OPT_BOOLEAN('f', "force", &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", &show_threads,
 		    "Show per-thread event counters"),
 	OPT_STRING(0, "pretty", &pretty_printing_style, "key",
 		   "pretty printing style key: normal raw"),
 	OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
 	OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 		   "sort by key(s): pid, comm, dso, symbol, parent"),
 	OPT_BOOLEAN(0, "showcpuutilization", &symbol_conf.show_cpu_utilization,
 		    "Show sample percentage for different cpu modes"),
 	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", NULL, "output_type,min_percent, call_order",
 		     "Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold and callchain order. "
 		     "Default: fractal,0.5,callee", &parse_callchain_opt, callchain_default_opt),
 	OPT_BOOLEAN('G', "inverted", &inverted_callchain, "alias for inverted call graph"),
 	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('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 		   "only consider these symbols"),
 	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('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", &hide_unresolved,
 		    "Only display entries resolved to a symbol"),
 	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 		    "Look for files with symbols relative to this directory"),
 	OPT_END()
 };

 int cmd_report(int argc, const char **argv, const char *prefix __used)
 {
 	argc = parse_options(argc, argv, options, report_usage, 0);

 	if (use_stdio)
 		use_browser = 0;
 	else if (use_tui)
 		use_browser = 1;

 	if (inverted_callchain)
 		callchain_param.order = ORDER_CALLER;

 	if (strcmp(input_name, "-") != 0)
 		setup_browser(true);
 	else
 		use_browser = 0;
 	/*
 	 * Only in the newt browser we are doing integrated annotation,
 	 * so don't allocate extra space that won't be used in the stdio
 	 * implementation.
 	 */
 	if (use_browser > 0) {
 		symbol_conf.priv_size = sizeof(struct annotation);
 		annotate_init	      = symbol__annotate_init;
 		/*
  		 * For searching by name on the "Browse map details".
  		 * providing it only in verbose mode not to bloat too
  		 * much struct symbol.
  		 */
 		if (verbose) {
 			/*
 			 * 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;
 		}
 	}

 	if (symbol__init() < 0)
 		return -1;

 	setup_sorting(report_usage, options);

 	if (parent_pattern != default_parent_pattern) {
 		if (sort_dimension__add("parent") < 0)
 			return -1;

 		/*
 		 * Only show the parent fields if we explicitly
 		 * sort that way. If we only use parent machinery
 		 * for filtering, we don't want it.
 		 */
 		if (!strstr(sort_order, "parent"))
 			sort_parent.elide = 1;
 	} else
 		symbol_conf.exclude_other = false;

 	/*
 	 * Any (unrecognized) arguments left?
 	 */
 	if (argc)
 		usage_with_options(report_usage, options);

 	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
 	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
 	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);

 	return __cmd_report();
 }
	/*
	* 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/annotate.h"
	#include "util/color.h"
	#include <linux/list.h>
	#include "util/cache.h"
	#include <linux/rbtree.h>
	#include "util/symbol.h"
	#include "util/callchain.h"
	#include "util/strlist.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/parse-options.h"
	#include "util/parse-events.h"

	#include "util/thread.h"
	#include "util/sort.h"
	#include "util/hist.h"

	static char const *input_name = "perf.data";

	static bool force, use_tui, use_stdio;
	static bool hide_unresolved;
	static bool dont_use_callchains;

	static bool show_threads;
	static struct perf_read_values show_threads_values;

	static const char default_pretty_printing_style[] = "normal";
	static const char *pretty_printing_style = default_pretty_printing_style;

	static char callchain_default_opt[] = "fractal,0.5,callee";
	static bool inverted_callchain;
	static symbol_filter_t annotate_init;

	static int perf_session__add_hist_entry(struct perf_session *session,
	struct addr_location *al,
	struct perf_sample *sample,
	struct perf_evsel *evsel)
	{
	struct symbol *parent = NULL;
	int err = 0;
	struct hist_entry *he;

	if ((sort__has_parent \|\| symbol_conf.use_callchain) && sample->callchain) {
	err = perf_session__resolve_callchain(session, al->thread,
	sample->callchain, &parent);
	if (err)
	return err;
	}

	he = __hists__add_entry(&evsel->hists, al, parent, sample->period);
	if (he == NULL)
	return -ENOMEM;

	if (symbol_conf.use_callchain) {
	err = callchain_append(he->callchain, &session->callchain_cursor,
	sample->period);
	if (err)
	return err;
	}
	/*
	* Only in the newt browser we are doing integrated annotation,
	* so we don't allocated the extra space needed because the stdio
	* code will not use it.
	*/
	if (al->sym != NULL && use_browser > 0) {
	struct annotation *notes = symbol__annotation(he->ms.sym);

	assert(evsel != NULL);

	err = -ENOMEM;
	if (notes->src == NULL &&
	symbol__alloc_hist(he->ms.sym, session->evlist->nr_entries) < 0)
	goto out;

	err = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
	}

	evsel->hists.stats.total_period += sample->period;
	hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
	out:
	return err;
	}


	static int process_sample_event(union perf_event *event,
	struct perf_sample *sample,
	struct perf_evsel *evsel,
	struct perf_session *session)
	{
	struct addr_location al;

	if (perf_event__preprocess_sample(event, session, &al, sample,
	annotate_init) < 0) {
	fprintf(stderr, "problem processing %d event, skipping it.\n",
	event->header.type);
	return -1;
	}

	if (al.filtered \|\| (hide_unresolved && al.sym == NULL))
	return 0;

	if (al.map != NULL)
	al.map->dso->hit = 1;

	if (perf_session__add_hist_entry(session, &al, sample, evsel)) {
	pr_debug("problem incrementing symbol period, skipping event\n");
	return -1;
	}

	return 0;
	}

	static int process_read_event(union perf_event *event,
	struct perf_sample *sample __used,
	struct perf_session *session)
	{
	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist,
	event->read.id);
	if (show_threads) {
	const char *name = evsel ? event_name(evsel) : "unknown";
	perf_read_values_add_value(&show_threads_values,
	event->read.pid, event->read.tid,
	event->read.id,
	name,
	event->read.value);
	}

	dump_printf(": %d %d %s %" PRIu64 "\n", event->read.pid, event->read.tid,
	evsel ? event_name(evsel) : "FAIL",
	event->read.value);

	return 0;
	}

	static int perf_session__setup_sample_type(struct perf_session *self)
	{
	if (!(self->sample_type & PERF_SAMPLE_CALLCHAIN)) {
	if (sort__has_parent) {
	fprintf(stderr, "selected --sort parent, but no"
	" callchain data. Did you call"
	" perf record without -g?\n");
	return -EINVAL;
	}
	if (symbol_conf.use_callchain) {
	fprintf(stderr, "selected -g but no callchain data."
	" Did you call perf record without"
	" -g?\n");
	return -1;
	}
	} else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE &&
	!symbol_conf.use_callchain) {
	symbol_conf.use_callchain = true;
	if (callchain_register_param(&callchain_param) < 0) {
	fprintf(stderr, "Can't register callchain"
	" params\n");
	return -EINVAL;
	}
	}

	return 0;
	}

	static struct perf_event_ops event_ops = {
	.sample = process_sample_event,
	.mmap = perf_event__process_mmap,
	.comm = perf_event__process_comm,
	.exit = perf_event__process_task,
	.fork = perf_event__process_task,
	.lost = perf_event__process_lost,
	.read = process_read_event,
	.attr = perf_event__process_attr,
	.event_type = perf_event__process_event_type,
	.tracing_data = perf_event__process_tracing_data,
	.build_id = perf_event__process_build_id,
	.ordered_samples = true,
	.ordering_requires_timestamps = true,
	};

	extern volatile int session_done;

	static void sig_handler(int sig __used)
	{
	session_done = 1;
	}

	static size_t hists__fprintf_nr_sample_events(struct hists *self,
	const char evname, FILE fp)
	{
	size_t ret;
	char unit;
	unsigned long nr_events = self->stats.nr_events[PERF_RECORD_SAMPLE];

	nr_events = convert_unit(nr_events, &unit);
	ret = fprintf(fp, "# Events: %lu%c", nr_events, unit);
	if (evname != NULL)
	ret += fprintf(fp, " %s", evname);
	return ret + fprintf(fp, "\n#\n");
	}

	static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
	const char *help)
	{
	struct perf_evsel *pos;

	list_for_each_entry(pos, &evlist->entries, node) {
	struct hists *hists = &pos->hists;
	const char *evname = NULL;

	if (rb_first(&hists->entries) != rb_last(&hists->entries))
	evname = event_name(pos);

	hists__fprintf_nr_sample_events(hists, evname, stdout);
	hists__fprintf(hists, NULL, false, stdout);
	fprintf(stdout, "\n\n");
	}

	if (sort_order == default_sort_order &&
	parent_pattern == default_parent_pattern) {
	fprintf(stdout, "#\n# (%s)\n#\n", help);

	if (show_threads) {
	bool style = !strcmp(pretty_printing_style, "raw");
	perf_read_values_display(stdout, &show_threads_values,
	style);
	perf_read_values_destroy(&show_threads_values);
	}
	}

	return 0;
	}

	static int __cmd_report(void)
	{
	int ret = -EINVAL;
	u64 nr_samples;
	struct perf_session *session;
	struct perf_evsel *pos;
	struct map *kernel_map;
	struct kmap *kernel_kmap;
	const char *help = "For a higher level overview, try: perf report --sort comm,dso";

	signal(SIGINT, sig_handler);

	session = perf_session__new(input_name, O_RDONLY, force, false, &event_ops);
	if (session == NULL)
	return -ENOMEM;

	if (show_threads)
	perf_read_values_init(&show_threads_values);

	ret = perf_session__setup_sample_type(session);
	if (ret)
	goto out_delete;

	ret = perf_session__process_events(session, &event_ops);
	if (ret)
	goto out_delete;

	kernel_map = session->host_machine.vmlinux_maps[MAP__FUNCTION];
	kernel_kmap = map__kmap(kernel_map);
	if (kernel_map == NULL \|\|
	(kernel_map->dso->hit &&
	(kernel_kmap->ref_reloc_sym == NULL \|\|
	kernel_kmap->ref_reloc_sym->addr == 0))) {
	const struct dso *kdso = kernel_map->dso;

	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",
	RB_EMPTY_ROOT(&kdso->symbols[MAP__FUNCTION]) ?
	"As no suitable kallsyms nor vmlinux was found, kernel samples\n"
	"can't be resolved." :
	"If some relocation was applied (e.g. kexec) symbols may be misresolved.");
	}

	if (dump_trace) {
	perf_session__fprintf_nr_events(session, stdout);
	goto out_delete;
	}

	if (verbose > 3)
	perf_session__fprintf(session, stdout);

	if (verbose > 2)
	perf_session__fprintf_dsos(session, stdout);

	nr_samples = 0;
	list_for_each_entry(pos, &session->evlist->entries, node) {
	struct hists *hists = &pos->hists;

	hists__collapse_resort(hists);
	hists__output_resort(hists);
	nr_samples += hists->stats.nr_events[PERF_RECORD_SAMPLE];
	}

	if (nr_samples == 0) {
	ui__warning("The %s file has no samples!\n", input_name);
	goto out_delete;
	}

	if (use_browser > 0)
	perf_evlist__tui_browse_hists(session->evlist, help);
	else
	perf_evlist__tty_browse_hists(session->evlist, help);

	out_delete:
	/*
	* Speed up the exit process, for large files this can
	* take quite a while.
	*
	* XXX Enable this when using valgrind or if we ever
	* librarize this command.
	*
	* Also experiment with obstacks to see how much speed
	* up we'll get here.
	*
	* perf_session__delete(session);
	*/
	return ret;
	}

	static int
	parse_callchain_opt(const struct option opt __used, const char arg,
	int unset)
	{
	char tok, tok2;
	char *endptr;

	/*
	* --no-call-graph
	*/
	if (unset) {
	dont_use_callchains = true;
	return 0;
	}

	symbol_conf.use_callchain = true;

	if (!arg)
	return 0;

	tok = strtok((char *)arg, ",");
	if (!tok)
	return -1;

	/* get the output mode */
	if (!strncmp(tok, "graph", strlen(arg)))
	callchain_param.mode = CHAIN_GRAPH_ABS;

	else if (!strncmp(tok, "flat", strlen(arg)))
	callchain_param.mode = CHAIN_FLAT;

	else if (!strncmp(tok, "fractal", strlen(arg)))
	callchain_param.mode = CHAIN_GRAPH_REL;

	else if (!strncmp(tok, "none", strlen(arg))) {
	callchain_param.mode = CHAIN_NONE;
	symbol_conf.use_callchain = false;

	return 0;
	}

	else
	return -1;

	/* get the min percentage */
	tok = strtok(NULL, ",");
	if (!tok)
	goto setup;

	callchain_param.min_percent = strtod(tok, &endptr);
	if (tok == endptr)
	return -1;

	/* get the print limit */
	tok2 = strtok(NULL, ",");
	if (!tok2)
	goto setup;

	if (tok2[0] != 'c') {
	callchain_param.print_limit = strtod(tok2, &endptr);
	tok2 = strtok(NULL, ",");
	if (!tok2)
	goto setup;
	}

	/* get the call chain order */
	if (!strcmp(tok2, "caller"))
	callchain_param.order = ORDER_CALLER;
	else if (!strcmp(tok2, "callee"))
	callchain_param.order = ORDER_CALLEE;
	else
	return -1;
	setup:
	if (callchain_register_param(&callchain_param) < 0) {
	fprintf(stderr, "Can't register callchain params\n");
	return -1;
	}
	return 0;
	}

	static const char * const report_usage[] = {
	"perf report [<options>] <command>",
	NULL
	};

	static 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('D', "dump-raw-trace", &dump_trace,
	"dump raw trace in ASCII"),
	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
	"file", "vmlinux pathname"),
	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
	"file", "kallsyms pathname"),
	OPT_BOOLEAN('f', "force", &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", &show_threads,
	"Show per-thread event counters"),
	OPT_STRING(0, "pretty", &pretty_printing_style, "key",
	"pretty printing style key: normal raw"),
	OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
	OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
	"sort by key(s): pid, comm, dso, symbol, parent"),
	OPT_BOOLEAN(0, "showcpuutilization", &symbol_conf.show_cpu_utilization,
	"Show sample percentage for different cpu modes"),
	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", NULL, "output_type,min_percent, call_order",
	"Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold and callchain order. "
	"Default: fractal,0.5,callee", &parse_callchain_opt, callchain_default_opt),
	OPT_BOOLEAN('G', "inverted", &inverted_callchain, "alias for inverted call graph"),
	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('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
	"only consider these symbols"),
	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('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", &hide_unresolved,
	"Only display entries resolved to a symbol"),
	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
	"Look for files with symbols relative to this directory"),
	OPT_END()
	};

	int cmd_report(int argc, const char *argv, const char prefix __used)
	{
	argc = parse_options(argc, argv, options, report_usage, 0);

	if (use_stdio)
	use_browser = 0;
	else if (use_tui)
	use_browser = 1;

	if (inverted_callchain)
	callchain_param.order = ORDER_CALLER;

	if (strcmp(input_name, "-") != 0)
	setup_browser(true);
	else
	use_browser = 0;
	/*
	* Only in the newt browser we are doing integrated annotation,
	* so don't allocate extra space that won't be used in the stdio
	* implementation.
	*/
	if (use_browser > 0) {
	symbol_conf.priv_size = sizeof(struct annotation);
	annotate_init = symbol__annotate_init;
	/*
	* For searching by name on the "Browse map details".
	* providing it only in verbose mode not to bloat too
	* much struct symbol.
	*/
	if (verbose) {
	/*
	* 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;
	}
	}

	if (symbol__init() < 0)
	return -1;

	setup_sorting(report_usage, options);

	if (parent_pattern != default_parent_pattern) {
	if (sort_dimension__add("parent") < 0)
	return -1;

	/*
	* Only show the parent fields if we explicitly
	* sort that way. If we only use parent machinery
	* for filtering, we don't want it.
	*/
	if (!strstr(sort_order, "parent"))
	sort_parent.elide = 1;
	} else
	symbol_conf.exclude_other = false;

	/*
	* Any (unrecognized) arguments left?
	*/
	if (argc)
	usage_with_options(report_usage, options);

	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);

	return __cmd_report();
	}