linux/tools/perf/util/hist.c

#include "util.h"
#include "build-id.h"
#include "hist.h"
#include "session.h"
#include "sort.h"
#include <math.h>

struct callchain_param	callchain_param = {
	.mode	= CHAIN_GRAPH_REL,
	.min_percent = 0.5
};

static void hist_entry__add_cpumode_period(struct hist_entry *self,
					   unsigned int cpumode, u64 period)
{
	switch (cpumode) {
	case PERF_RECORD_MISC_KERNEL:
		self->period_sys += period;
		break;
	case PERF_RECORD_MISC_USER:
		self->period_us += period;
		break;
	case PERF_RECORD_MISC_GUEST_KERNEL:
		self->period_guest_sys += period;
		break;
	case PERF_RECORD_MISC_GUEST_USER:
		self->period_guest_us += period;
		break;
	default:
		break;
	}
}

/*
 * histogram, sorted on item, collects periods
 */

static struct hist_entry *hist_entry__new(struct hist_entry *template)
{
	size_t callchain_size = symbol_conf.use_callchain ? sizeof(struct callchain_node) : 0;
	struct hist_entry *self = malloc(sizeof(*self) + callchain_size);

	if (self != NULL) {
		*self = *template;
		self->nr_events = 1;
		if (symbol_conf.use_callchain)
			callchain_init(self->callchain);
	}

	return self;
}

static void hists__inc_nr_entries(struct hists *self, struct hist_entry *entry)
{
	if (entry->ms.sym && self->max_sym_namelen < entry->ms.sym->namelen)
		self->max_sym_namelen = entry->ms.sym->namelen;
	++self->nr_entries;
}

struct hist_entry *__hists__add_entry(struct hists *self,
				      struct addr_location *al,
				      struct symbol *sym_parent, u64 period)
{
	struct rb_node **p = &self->entries.rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *he;
	struct hist_entry entry = {
		.thread	= al->thread,
		.ms = {
			.map	= al->map,
			.sym	= al->sym,
		},
		.cpu	= al->cpu,
		.ip	= al->addr,
		.level	= al->level,
		.period	= period,
		.parent = sym_parent,
	};
	int cmp;

	while (*p != NULL) {
		parent = *p;
		he = rb_entry(parent, struct hist_entry, rb_node);

		cmp = hist_entry__cmp(&entry, he);

		if (!cmp) {
			he->period += period;
			++he->nr_events;
			goto out;
		}

		if (cmp < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	he = hist_entry__new(&entry);
	if (!he)
		return NULL;
	rb_link_node(&he->rb_node, parent, p);
	rb_insert_color(&he->rb_node, &self->entries);
	hists__inc_nr_entries(self, he);
out:
	hist_entry__add_cpumode_period(he, al->cpumode, period);
	return he;
}

int64_t
hist_entry__cmp(struct hist_entry *left, struct hist_entry *right)
{
	struct sort_entry *se;
	int64_t cmp = 0;

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		cmp = se->se_cmp(left, right);
		if (cmp)
			break;
	}

	return cmp;
}

int64_t
hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
{
	struct sort_entry *se;
	int64_t cmp = 0;

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		int64_t (*f)(struct hist_entry *, struct hist_entry *);

		f = se->se_collapse ?: se->se_cmp;

		cmp = f(left, right);
		if (cmp)
			break;
	}

	return cmp;
}

void hist_entry__free(struct hist_entry *he)
{
	free(he);
}

/*
 * collapse the histogram
 */

static bool collapse__insert_entry(struct rb_root *root, struct hist_entry *he)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;
	int64_t cmp;

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);

		cmp = hist_entry__collapse(iter, he);

		if (!cmp) {
			iter->period += he->period;
			hist_entry__free(he);
			return false;
		}

		if (cmp < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&he->rb_node, parent, p);
	rb_insert_color(&he->rb_node, root);
	return true;
}

void hists__collapse_resort(struct hists *self)
{
	struct rb_root tmp;
	struct rb_node *next;
	struct hist_entry *n;

	if (!sort__need_collapse)
		return;

	tmp = RB_ROOT;
	next = rb_first(&self->entries);
	self->nr_entries = 0;
	self->max_sym_namelen = 0;

	while (next) {
		n = rb_entry(next, struct hist_entry, rb_node);
		next = rb_next(&n->rb_node);

		rb_erase(&n->rb_node, &self->entries);
		if (collapse__insert_entry(&tmp, n))
			hists__inc_nr_entries(self, n);
	}

	self->entries = tmp;
}

/*
 * reverse the map, sort on period.
 */

static void __hists__insert_output_entry(struct rb_root *entries,
					 struct hist_entry *he,
					 u64 min_callchain_hits)
{
	struct rb_node **p = &entries->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;

	if (symbol_conf.use_callchain)
		callchain_param.sort(&he->sorted_chain, he->callchain,
				      min_callchain_hits, &callchain_param);

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);

		if (he->period > iter->period)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&he->rb_node, parent, p);
	rb_insert_color(&he->rb_node, entries);
}

void hists__output_resort(struct hists *self)
{
	struct rb_root tmp;
	struct rb_node *next;
	struct hist_entry *n;
	u64 min_callchain_hits;

	min_callchain_hits = self->stats.total_period * (callchain_param.min_percent / 100);

	tmp = RB_ROOT;
	next = rb_first(&self->entries);

	self->nr_entries = 0;
	self->max_sym_namelen = 0;

	while (next) {
		n = rb_entry(next, struct hist_entry, rb_node);
		next = rb_next(&n->rb_node);

		rb_erase(&n->rb_node, &self->entries);
		__hists__insert_output_entry(&tmp, n, min_callchain_hits);
		hists__inc_nr_entries(self, n);
	}

	self->entries = tmp;
}

static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)
{
	int i;
	int ret = fprintf(fp, "            ");

	for (i = 0; i < left_margin; i++)
		ret += fprintf(fp, " ");

	return ret;
}

static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask,
					  int left_margin)
{
	int i;
	size_t ret = callchain__fprintf_left_margin(fp, left_margin);

	for (i = 0; i < depth; i++)
		if (depth_mask & (1 << i))
			ret += fprintf(fp, "|          ");
		else
			ret += fprintf(fp, "           ");

	ret += fprintf(fp, "\n");

	return ret;
}

static size_t ipchain__fprintf_graph(FILE *fp, struct callchain_list *chain,
				     int depth, int depth_mask, int period,
				     u64 total_samples, int hits,
				     int left_margin)
{
	int i;
	size_t ret = 0;

	ret += callchain__fprintf_left_margin(fp, left_margin);
	for (i = 0; i < depth; i++) {
		if (depth_mask & (1 << i))
			ret += fprintf(fp, "|");
		else
			ret += fprintf(fp, " ");
		if (!period && i == depth - 1) {
			double percent;

			percent = hits * 100.0 / total_samples;
			ret += percent_color_fprintf(fp, "--%2.2f%%-- ", percent);
		} else
			ret += fprintf(fp, "%s", "          ");
	}
	if (chain->ms.sym)
		ret += fprintf(fp, "%s\n", chain->ms.sym->name);
	else
		ret += fprintf(fp, "%p\n", (void *)(long)chain->ip);

	return ret;
}

static struct symbol *rem_sq_bracket;
static struct callchain_list rem_hits;

static void init_rem_hits(void)
{
	rem_sq_bracket = malloc(sizeof(*rem_sq_bracket) + 6);
	if (!rem_sq_bracket) {
		fprintf(stderr, "Not enough memory to display remaining hits\n");
		return;
	}

	strcpy(rem_sq_bracket->name, "[...]");
	rem_hits.ms.sym = rem_sq_bracket;
}

static size_t __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
					 u64 total_samples, int depth,
					 int depth_mask, int left_margin)
{
	struct rb_node *node, *next;
	struct callchain_node *child;
	struct callchain_list *chain;
	int new_depth_mask = depth_mask;
	u64 new_total;
	u64 remaining;
	size_t ret = 0;
	int i;
	uint entries_printed = 0;

	if (callchain_param.mode == CHAIN_GRAPH_REL)
		new_total = self->children_hit;
	else
		new_total = total_samples;

	remaining = new_total;

	node = rb_first(&self->rb_root);
	while (node) {
		u64 cumul;

		child = rb_entry(node, struct callchain_node, rb_node);
		cumul = cumul_hits(child);
		remaining -= cumul;

		/*
		 * The depth mask manages the output of pipes that show
		 * the depth. We don't want to keep the pipes of the current
		 * level for the last child of this depth.
		 * Except if we have remaining filtered hits. They will
		 * supersede the last child
		 */
		next = rb_next(node);
		if (!next && (callchain_param.mode != CHAIN_GRAPH_REL || !remaining))
			new_depth_mask &= ~(1 << (depth - 1));

		/*
		 * But we keep the older depth mask for the line separator
		 * to keep the level link until we reach the last child
		 */
		ret += ipchain__fprintf_graph_line(fp, depth, depth_mask,
						   left_margin);
		i = 0;
		list_for_each_entry(chain, &child->val, list) {
			ret += ipchain__fprintf_graph(fp, chain, depth,
						      new_depth_mask, i++,
						      new_total,
						      cumul,
						      left_margin);
		}
		ret += __callchain__fprintf_graph(fp, child, new_total,
						  depth + 1,
						  new_depth_mask | (1 << depth),
						  left_margin);
		node = next;
		if (++entries_printed == callchain_param.print_limit)
			break;
	}

	if (callchain_param.mode == CHAIN_GRAPH_REL &&
		remaining && remaining != new_total) {

		if (!rem_sq_bracket)
			return ret;

		new_depth_mask &= ~(1 << (depth - 1));

		ret += ipchain__fprintf_graph(fp, &rem_hits, depth,
					      new_depth_mask, 0, new_total,
					      remaining, left_margin);
	}

	return ret;
}

static size_t callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
				       u64 total_samples, int left_margin)
{
	struct callchain_list *chain;
	bool printed = false;
	int i = 0;
	int ret = 0;
	u32 entries_printed = 0;

	list_for_each_entry(chain, &self->val, list) {
		if (!i++ && sort__first_dimension == SORT_SYM)
			continue;

		if (!printed) {
			ret += callchain__fprintf_left_margin(fp, left_margin);
			ret += fprintf(fp, "|\n");
			ret += callchain__fprintf_left_margin(fp, left_margin);
			ret += fprintf(fp, "---");

			left_margin += 3;
			printed = true;
		} else
			ret += callchain__fprintf_left_margin(fp, left_margin);

		if (chain->ms.sym)
			ret += fprintf(fp, " %s\n", chain->ms.sym->name);
		else
			ret += fprintf(fp, " %p\n", (void *)(long)chain->ip);

		if (++entries_printed == callchain_param.print_limit)
			break;
	}

	ret += __callchain__fprintf_graph(fp, self, total_samples, 1, 1, left_margin);

	return ret;
}

static size_t callchain__fprintf_flat(FILE *fp, struct callchain_node *self,
				      u64 total_samples)
{
	struct callchain_list *chain;
	size_t ret = 0;

	if (!self)
		return 0;

	ret += callchain__fprintf_flat(fp, self->parent, total_samples);


	list_for_each_entry(chain, &self->val, list) {
		if (chain->ip >= PERF_CONTEXT_MAX)
			continue;
		if (chain->ms.sym)
			ret += fprintf(fp, "                %s\n", chain->ms.sym->name);
		else
			ret += fprintf(fp, "                %p\n",
					(void *)(long)chain->ip);
	}

	return ret;
}

static size_t hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
					    u64 total_samples, int left_margin)
{
	struct rb_node *rb_node;
	struct callchain_node *chain;
	size_t ret = 0;
	u32 entries_printed = 0;

	rb_node = rb_first(&self->sorted_chain);
	while (rb_node) {
		double percent;

		chain = rb_entry(rb_node, struct callchain_node, rb_node);
		percent = chain->hit * 100.0 / total_samples;
		switch (callchain_param.mode) {
		case CHAIN_FLAT:
			ret += percent_color_fprintf(fp, "           %6.2f%%\n",
						     percent);
			ret += callchain__fprintf_flat(fp, chain, total_samples);
			break;
		case CHAIN_GRAPH_ABS: /* Falldown */
		case CHAIN_GRAPH_REL:
			ret += callchain__fprintf_graph(fp, chain, total_samples,
							left_margin);
		case CHAIN_NONE:
		default:
			break;
		}
		ret += fprintf(fp, "\n");
		if (++entries_printed == callchain_param.print_limit)
			break;
		rb_node = rb_next(rb_node);
	}

	return ret;
}

int hist_entry__snprintf(struct hist_entry *self, char *s, size_t size,
			 struct hists *pair_hists, bool show_displacement,
			 long displacement, bool color, u64 session_total)
{
	struct sort_entry *se;
	u64 period, total, period_sys, period_us, period_guest_sys, period_guest_us;
	const char *sep = symbol_conf.field_sep;
	int ret;

	if (symbol_conf.exclude_other && !self->parent)
		return 0;

	if (pair_hists) {
		period = self->pair ? self->pair->period : 0;
		total = pair_hists->stats.total_period;
		period_sys = self->pair ? self->pair->period_sys : 0;
		period_us = self->pair ? self->pair->period_us : 0;
		period_guest_sys = self->pair ? self->pair->period_guest_sys : 0;
		period_guest_us = self->pair ? self->pair->period_guest_us : 0;
	} else {
		period = self->period;
		total = session_total;
		period_sys = self->period_sys;
		period_us = self->period_us;
		period_guest_sys = self->period_guest_sys;
		period_guest_us = self->period_guest_us;
	}

	if (total) {
		if (color)
			ret = percent_color_snprintf(s, size,
						     sep ? "%.2f" : "   %6.2f%%",
						     (period * 100.0) / total);
		else
			ret = snprintf(s, size, sep ? "%.2f" : "   %6.2f%%",
				       (period * 100.0) / total);
		if (symbol_conf.show_cpu_utilization) {
			ret += percent_color_snprintf(s + ret, size - ret,
					sep ? "%.2f" : "   %6.2f%%",
					(period_sys * 100.0) / total);
			ret += percent_color_snprintf(s + ret, size - ret,
					sep ? "%.2f" : "   %6.2f%%",
					(period_us * 100.0) / total);
			if (perf_guest) {
				ret += percent_color_snprintf(s + ret,
						size - ret,
						sep ? "%.2f" : "   %6.2f%%",
						(period_guest_sys * 100.0) /
								total);
				ret += percent_color_snprintf(s + ret,
						size - ret,
						sep ? "%.2f" : "   %6.2f%%",
						(period_guest_us * 100.0) /
								total);
			}
		}
	} else
		ret = snprintf(s, size, sep ? "%lld" : "%12lld ", period);

	if (symbol_conf.show_nr_samples) {
		if (sep)
			ret += snprintf(s + ret, size - ret, "%c%lld", *sep, period);
		else
			ret += snprintf(s + ret, size - ret, "%11lld", period);
	}

	if (pair_hists) {
		char bf[32];
		double old_percent = 0, new_percent = 0, diff;

		if (total > 0)
			old_percent = (period * 100.0) / total;
		if (session_total > 0)
			new_percent = (self->period * 100.0) / session_total;

		diff = new_percent - old_percent;

		if (fabs(diff) >= 0.01)
			snprintf(bf, sizeof(bf), "%+4.2F%%", diff);
		else
			snprintf(bf, sizeof(bf), " ");

		if (sep)
			ret += snprintf(s + ret, size - ret, "%c%s", *sep, bf);
		else
			ret += snprintf(s + ret, size - ret, "%11.11s", bf);

		if (show_displacement) {
			if (displacement)
				snprintf(bf, sizeof(bf), "%+4ld", displacement);
			else
				snprintf(bf, sizeof(bf), " ");

			if (sep)
				ret += snprintf(s + ret, size - ret, "%c%s", *sep, bf);
			else
				ret += snprintf(s + ret, size - ret, "%6.6s", bf);
		}
	}

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		if (se->elide)
			continue;

		ret += snprintf(s + ret, size - ret, "%s", sep ?: "  ");
		ret += se->se_snprintf(self, s + ret, size - ret,
				       se->se_width ? *se->se_width : 0);
	}

	return ret;
}

int hist_entry__fprintf(struct hist_entry *self, struct hists *pair_hists,
			bool show_displacement, long displacement, FILE *fp,
			u64 session_total)
{
	char bf[512];
	hist_entry__snprintf(self, bf, sizeof(bf), pair_hists,
			     show_displacement, displacement,
			     true, session_total);
	return fprintf(fp, "%s\n", bf);
}

static size_t hist_entry__fprintf_callchain(struct hist_entry *self, FILE *fp,
					    u64 session_total)
{
	int left_margin = 0;

	if (sort__first_dimension == SORT_COMM) {
		struct sort_entry *se = list_first_entry(&hist_entry__sort_list,
							 typeof(*se), list);
		left_margin = se->se_width ? *se->se_width : 0;
		left_margin -= thread__comm_len(self->thread);
	}

	return hist_entry_callchain__fprintf(fp, self, session_total,
					     left_margin);
}

size_t hists__fprintf(struct hists *self, struct hists *pair,
		      bool show_displacement, FILE *fp)
{
	struct sort_entry *se;
	struct rb_node *nd;
	size_t ret = 0;
	unsigned long position = 1;
	long displacement = 0;
	unsigned int width;
	const char *sep = symbol_conf.field_sep;
	const char *col_width = symbol_conf.col_width_list_str;

	init_rem_hits();

	fprintf(fp, "# %s", pair ? "Baseline" : "Overhead");

	if (symbol_conf.show_nr_samples) {
		if (sep)
			fprintf(fp, "%cSamples", *sep);
		else
			fputs("  Samples  ", fp);
	}

	if (symbol_conf.show_cpu_utilization) {
		if (sep) {
			ret += fprintf(fp, "%csys", *sep);
			ret += fprintf(fp, "%cus", *sep);
			if (perf_guest) {
				ret += fprintf(fp, "%cguest sys", *sep);
				ret += fprintf(fp, "%cguest us", *sep);
			}
		} else {
			ret += fprintf(fp, "  sys  ");
			ret += fprintf(fp, "  us  ");
			if (perf_guest) {
				ret += fprintf(fp, "  guest sys  ");
				ret += fprintf(fp, "  guest us  ");
			}
		}
	}

	if (pair) {
		if (sep)
			ret += fprintf(fp, "%cDelta", *sep);
		else
			ret += fprintf(fp, "  Delta    ");

		if (show_displacement) {
			if (sep)
				ret += fprintf(fp, "%cDisplacement", *sep);
			else
				ret += fprintf(fp, " Displ");
		}
	}

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		if (se->elide)
			continue;
		if (sep) {
			fprintf(fp, "%c%s", *sep, se->se_header);
			continue;
		}
		width = strlen(se->se_header);
		if (se->se_width) {
			if (symbol_conf.col_width_list_str) {
				if (col_width) {
					*se->se_width = atoi(col_width);
					col_width = strchr(col_width, ',');
					if (col_width)
						++col_width;
				}
			}
			width = *se->se_width = max(*se->se_width, width);
		}
		fprintf(fp, "  %*s", width, se->se_header);
	}
	fprintf(fp, "\n");

	if (sep)
		goto print_entries;

	fprintf(fp, "# ........");
	if (symbol_conf.show_nr_samples)
		fprintf(fp, " ..........");
	if (pair) {
		fprintf(fp, " ..........");
		if (show_displacement)
			fprintf(fp, " .....");
	}
	list_for_each_entry(se, &hist_entry__sort_list, list) {
		unsigned int i;

		if (se->elide)
			continue;

		fprintf(fp, "  ");
		if (se->se_width)
			width = *se->se_width;
		else
			width = strlen(se->se_header);
		for (i = 0; i < width; i++)
			fprintf(fp, ".");
	}

	fprintf(fp, "\n#\n");

print_entries:
	for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (show_displacement) {
			if (h->pair != NULL)
				displacement = ((long)h->pair->position -
					        (long)position);
			else
				displacement = 0;
			++position;
		}
		ret += hist_entry__fprintf(h, pair, show_displacement,
					   displacement, fp, self->stats.total_period);

		if (symbol_conf.use_callchain)
			ret += hist_entry__fprintf_callchain(h, fp, self->stats.total_period);

		if (h->ms.map == NULL && verbose > 1) {
			__map_groups__fprintf_maps(&h->thread->mg,
						   MAP__FUNCTION, verbose, fp);
			fprintf(fp, "%.10s end\n", graph_dotted_line);
		}
	}

	free(rem_sq_bracket);

	return ret;
}

enum hist_filter {
	HIST_FILTER__DSO,
	HIST_FILTER__THREAD,
};

void hists__filter_by_dso(struct hists *self, const struct dso *dso)
{
	struct rb_node *nd;

	self->nr_entries = self->stats.total_period = 0;
	self->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
	self->max_sym_namelen = 0;

	for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (symbol_conf.exclude_other && !h->parent)
			continue;

		if (dso != NULL && (h->ms.map == NULL || h->ms.map->dso != dso)) {
			h->filtered |= (1 << HIST_FILTER__DSO);
			continue;
		}

		h->filtered &= ~(1 << HIST_FILTER__DSO);
		if (!h->filtered) {
			++self->nr_entries;
			self->stats.total_period += h->period;
			self->stats.nr_events[PERF_RECORD_SAMPLE] += h->nr_events;
			if (h->ms.sym &&
			    self->max_sym_namelen < h->ms.sym->namelen)
				self->max_sym_namelen = h->ms.sym->namelen;
		}
	}
}

void hists__filter_by_thread(struct hists *self, const struct thread *thread)
{
	struct rb_node *nd;

	self->nr_entries = self->stats.total_period = 0;
	self->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
	self->max_sym_namelen = 0;

	for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (thread != NULL && h->thread != thread) {
			h->filtered |= (1 << HIST_FILTER__THREAD);
			continue;
		}
		h->filtered &= ~(1 << HIST_FILTER__THREAD);
		if (!h->filtered) {
			++self->nr_entries;
			self->stats.total_period += h->period;
			self->stats.nr_events[PERF_RECORD_SAMPLE] += h->nr_events;
			if (h->ms.sym &&
			    self->max_sym_namelen < h->ms.sym->namelen)
				self->max_sym_namelen = h->ms.sym->namelen;
		}
	}
}

static int symbol__alloc_hist(struct symbol *self)
{
	struct sym_priv *priv = symbol__priv(self);
	const int size = (sizeof(*priv->hist) +
			  (self->end - self->start) * sizeof(u64));

	priv->hist = zalloc(size);
	return priv->hist == NULL ? -1 : 0;
}

int hist_entry__inc_addr_samples(struct hist_entry *self, u64 ip)
{
	unsigned int sym_size, offset;
	struct symbol *sym = self->ms.sym;
	struct sym_priv *priv;
	struct sym_hist *h;

	if (!sym || !self->ms.map)
		return 0;

	priv = symbol__priv(sym);
	if (priv->hist == NULL && symbol__alloc_hist(sym) < 0)
		return -ENOMEM;

	sym_size = sym->end - sym->start;
	offset = ip - sym->start;

	pr_debug3("%s: ip=%#Lx\n", __func__, self->ms.map->unmap_ip(self->ms.map, ip));

	if (offset >= sym_size)
		return 0;

	h = priv->hist;
	h->sum++;
	h->ip[offset]++;

	pr_debug3("%#Lx %s: period++ [ip: %#Lx, %#Lx] => %Ld\n", self->ms.sym->start,
		  self->ms.sym->name, ip, ip - self->ms.sym->start, h->ip[offset]);
	return 0;
}

static struct objdump_line *objdump_line__new(s64 offset, char *line)
{
	struct objdump_line *self = malloc(sizeof(*self));

	if (self != NULL) {
		self->offset = offset;
		self->line = line;
	}

	return self;
}

void objdump_line__free(struct objdump_line *self)
{
	free(self->line);
	free(self);
}

static void objdump__add_line(struct list_head *head, struct objdump_line *line)
{
	list_add_tail(&line->node, head);
}

struct objdump_line *objdump__get_next_ip_line(struct list_head *head,
					       struct objdump_line *pos)
{
	list_for_each_entry_continue(pos, head, node)
		if (pos->offset >= 0)
			return pos;

	return NULL;
}

static int hist_entry__parse_objdump_line(struct hist_entry *self, FILE *file,
					  struct list_head *head)
{
	struct symbol *sym = self->ms.sym;
	struct objdump_line *objdump_line;
	char *line = NULL, *tmp, *tmp2, *c;
	size_t line_len;
	s64 line_ip, offset = -1;

	if (getline(&line, &line_len, file) < 0)
		return -1;

	if (!line)
		return -1;

	while (line_len != 0 && isspace(line[line_len - 1]))
		line[--line_len] = '\0';

	c = strchr(line, '\n');
	if (c)
		*c = 0;

	line_ip = -1;

	/*
	 * Strip leading spaces:
	 */
	tmp = line;
	while (*tmp) {
		if (*tmp != ' ')
			break;
		tmp++;
	}

	if (*tmp) {
		/*
		 * Parse hexa addresses followed by ':'
		 */
		line_ip = strtoull(tmp, &tmp2, 16);
		if (*tmp2 != ':' || tmp == tmp2)
			line_ip = -1;
	}

	if (line_ip != -1) {
		u64 start = map__rip_2objdump(self->ms.map, sym->start);
		offset = line_ip - start;
	}

	objdump_line = objdump_line__new(offset, line);
	if (objdump_line == NULL) {
		free(line);
		return -1;
	}
	objdump__add_line(head, objdump_line);

	return 0;
}

int hist_entry__annotate(struct hist_entry *self, struct list_head *head)
{
	struct symbol *sym = self->ms.sym;
	struct map *map = self->ms.map;
	struct dso *dso = map->dso;
	char *filename = dso__build_id_filename(dso, NULL, 0);
	bool free_filename = true;
	char command[PATH_MAX * 2];
	FILE *file;
	int err = 0;
	u64 len;

	if (filename == NULL) {
		if (dso->has_build_id) {
			pr_err("Can't annotate %s: not enough memory\n",
			       sym->name);
			return -ENOMEM;
		}
		goto fallback;
	} else if (readlink(filename, command, sizeof(command)) < 0 ||
		   strstr(command, "[kernel.kallsyms]") ||
		   access(filename, R_OK)) {
		free(filename);
fallback:
		/*
		 * If we don't have build-ids or the build-id file isn't in the
		 * cache, or is just a kallsyms file, well, lets hope that this
		 * DSO is the same as when 'perf record' ran.
		 */
		filename = dso->long_name;
		free_filename = false;
	}

	if (dso->origin == DSO__ORIG_KERNEL) {
		if (dso->annotate_warned)
			goto out_free_filename;
		err = -ENOENT;
		dso->annotate_warned = 1;
		pr_err("Can't annotate %s: No vmlinux file was found in the "
		       "path\n", sym->name);
		goto out_free_filename;
	}

	pr_debug("%s: filename=%s, sym=%s, start=%#Lx, end=%#Lx\n", __func__,
		 filename, sym->name, map->unmap_ip(map, sym->start),
		 map->unmap_ip(map, sym->end));

	len = sym->end - sym->start;

	pr_debug("annotating [%p] %30s : [%p] %30s\n",
		 dso, dso->long_name, sym, sym->name);

	snprintf(command, sizeof(command),
		 "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS -C %s|grep -v %s|expand",
		 map__rip_2objdump(map, sym->start),
		 map__rip_2objdump(map, sym->end),
		 filename, filename);

	pr_debug("Executing: %s\n", command);

	file = popen(command, "r");
	if (!file)
		goto out_free_filename;

	while (!feof(file))
		if (hist_entry__parse_objdump_line(self, file, head) < 0)
			break;

	pclose(file);
out_free_filename:
	if (free_filename)
		free(filename);
	return err;
}

void hists__inc_nr_events(struct hists *self, u32 type)
{
	++self->stats.nr_events[0];
	++self->stats.nr_events[type];
}

size_t hists__fprintf_nr_events(struct hists *self, FILE *fp)
{
	int i;
	size_t ret = 0;

	for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
		if (!event__name[i])
			continue;
		ret += fprintf(fp, "%10s events: %10d\n",
			       event__name[i], self->stats.nr_events[i]);
	}

	return ret;
}