perf hists: Update hists' total period when adding entries

[deliverable/linux.git] / tools / perf / util / hist.c

#include "util.h"
#include "build-id.h"
#include "hist.h"
#include "session.h"
#include "sort.h"
#include "evlist.h"
#include "evsel.h"
#include "annotate.h"
#include "ui/progress.h"
#include <math.h>

static bool hists__filter_entry_by_dso(struct hists *hists,
                                       struct hist_entry *he);
static bool hists__filter_entry_by_thread(struct hists *hists,
                                          struct hist_entry *he);
static bool hists__filter_entry_by_symbol(struct hists *hists,
                                          struct hist_entry *he);
static bool hists__filter_entry_by_socket(struct hists *hists,
                                          struct hist_entry *he);

u16 hists__col_len(struct hists *hists, enum hist_column col)
{
        return hists->col_len[col];
}

void hists__set_col_len(struct hists *hists, enum hist_column col, u16 len)
{
        hists->col_len[col] = len;
}

bool hists__new_col_len(struct hists *hists, enum hist_column col, u16 len)
{
        if (len > hists__col_len(hists, col)) {
                hists__set_col_len(hists, col, len);
                return true;
        }
        return false;
}

void hists__reset_col_len(struct hists *hists)
{
        enum hist_column col;

        for (col = 0; col < HISTC_NR_COLS; ++col)
                hists__set_col_len(hists, col, 0);
}

static void hists__set_unres_dso_col_len(struct hists *hists, int dso)
{
        const unsigned int unresolved_col_width = BITS_PER_LONG / 4;

        if (hists__col_len(hists, dso) < unresolved_col_width &&
            !symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
            !symbol_conf.dso_list)
                hists__set_col_len(hists, dso, unresolved_col_width);
}

void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
{
        const unsigned int unresolved_col_width = BITS_PER_LONG / 4;
        int symlen;
        u16 len;

        /*
         * +4 accounts for '[x] ' priv level info
         * +2 accounts for 0x prefix on raw addresses
         * +3 accounts for ' y ' symtab origin info
         */
        if (h->ms.sym) {
                symlen = h->ms.sym->namelen + 4;
                if (verbose)
                        symlen += BITS_PER_LONG / 4 + 2 + 3;
                hists__new_col_len(hists, HISTC_SYMBOL, symlen);
        } else {
                symlen = unresolved_col_width + 4 + 2;
                hists__new_col_len(hists, HISTC_SYMBOL, symlen);
                hists__set_unres_dso_col_len(hists, HISTC_DSO);
        }

        len = thread__comm_len(h->thread);
        if (hists__new_col_len(hists, HISTC_COMM, len))
                hists__set_col_len(hists, HISTC_THREAD, len + 6);

        if (h->ms.map) {
                len = dso__name_len(h->ms.map->dso);
                hists__new_col_len(hists, HISTC_DSO, len);
        }

        if (h->parent)
                hists__new_col_len(hists, HISTC_PARENT, h->parent->namelen);

        if (h->branch_info) {
                if (h->branch_info->from.sym) {
                        symlen = (int)h->branch_info->from.sym->namelen + 4;
                        if (verbose)
                                symlen += BITS_PER_LONG / 4 + 2 + 3;
                        hists__new_col_len(hists, HISTC_SYMBOL_FROM, symlen);

                        symlen = dso__name_len(h->branch_info->from.map->dso);
                        hists__new_col_len(hists, HISTC_DSO_FROM, symlen);
                } else {
                        symlen = unresolved_col_width + 4 + 2;
                        hists__new_col_len(hists, HISTC_SYMBOL_FROM, symlen);
                        hists__set_unres_dso_col_len(hists, HISTC_DSO_FROM);
                }

                if (h->branch_info->to.sym) {
                        symlen = (int)h->branch_info->to.sym->namelen + 4;
                        if (verbose)
                                symlen += BITS_PER_LONG / 4 + 2 + 3;
                        hists__new_col_len(hists, HISTC_SYMBOL_TO, symlen);

                        symlen = dso__name_len(h->branch_info->to.map->dso);
                        hists__new_col_len(hists, HISTC_DSO_TO, symlen);
                } else {
                        symlen = unresolved_col_width + 4 + 2;
                        hists__new_col_len(hists, HISTC_SYMBOL_TO, symlen);
                        hists__set_unres_dso_col_len(hists, HISTC_DSO_TO);
                }
        }

        if (h->mem_info) {
                if (h->mem_info->daddr.sym) {
                        symlen = (int)h->mem_info->daddr.sym->namelen + 4
                               + unresolved_col_width + 2;
                        hists__new_col_len(hists, HISTC_MEM_DADDR_SYMBOL,
                                           symlen);
                        hists__new_col_len(hists, HISTC_MEM_DCACHELINE,
                                           symlen + 1);
                } else {
                        symlen = unresolved_col_width + 4 + 2;
                        hists__new_col_len(hists, HISTC_MEM_DADDR_SYMBOL,
                                           symlen);
                        hists__new_col_len(hists, HISTC_MEM_DCACHELINE,
                                           symlen);
                }

                if (h->mem_info->iaddr.sym) {
                        symlen = (int)h->mem_info->iaddr.sym->namelen + 4
                               + unresolved_col_width + 2;
                        hists__new_col_len(hists, HISTC_MEM_IADDR_SYMBOL,
                                           symlen);
                } else {
                        symlen = unresolved_col_width + 4 + 2;
                        hists__new_col_len(hists, HISTC_MEM_IADDR_SYMBOL,
                                           symlen);
                }

                if (h->mem_info->daddr.map) {
                        symlen = dso__name_len(h->mem_info->daddr.map->dso);
                        hists__new_col_len(hists, HISTC_MEM_DADDR_DSO,
                                           symlen);
                } else {
                        symlen = unresolved_col_width + 4 + 2;
                        hists__set_unres_dso_col_len(hists, HISTC_MEM_DADDR_DSO);
                }
        } else {
                symlen = unresolved_col_width + 4 + 2;
                hists__new_col_len(hists, HISTC_MEM_DADDR_SYMBOL, symlen);
                hists__new_col_len(hists, HISTC_MEM_IADDR_SYMBOL, symlen);
                hists__set_unres_dso_col_len(hists, HISTC_MEM_DADDR_DSO);
        }

        hists__new_col_len(hists, HISTC_CPU, 3);
        hists__new_col_len(hists, HISTC_SOCKET, 6);
        hists__new_col_len(hists, HISTC_MEM_LOCKED, 6);
        hists__new_col_len(hists, HISTC_MEM_TLB, 22);
        hists__new_col_len(hists, HISTC_MEM_SNOOP, 12);
        hists__new_col_len(hists, HISTC_MEM_LVL, 21 + 3);
        hists__new_col_len(hists, HISTC_LOCAL_WEIGHT, 12);
        hists__new_col_len(hists, HISTC_GLOBAL_WEIGHT, 12);

        if (h->srcline)
                hists__new_col_len(hists, HISTC_SRCLINE, strlen(h->srcline));

        if (h->srcfile)
                hists__new_col_len(hists, HISTC_SRCFILE, strlen(h->srcfile));

        if (h->transaction)
                hists__new_col_len(hists, HISTC_TRANSACTION,
                                   hist_entry__transaction_len());
}

void hists__output_recalc_col_len(struct hists *hists, int max_rows)
{
        struct rb_node *next = rb_first(&hists->entries);
        struct hist_entry *n;
        int row = 0;

        hists__reset_col_len(hists);

        while (next && row++ < max_rows) {
                n = rb_entry(next, struct hist_entry, rb_node);
                if (!n->filtered)
                        hists__calc_col_len(hists, n);
                next = rb_next(&n->rb_node);
        }
}

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

static void he_stat__add_period(struct he_stat *he_stat, u64 period,
                                u64 weight)
{

        he_stat->period         += period;
        he_stat->weight         += weight;
        he_stat->nr_events      += 1;
}

static void he_stat__add_stat(struct he_stat *dest, struct he_stat *src)
{
        dest->period            += src->period;
        dest->period_sys        += src->period_sys;
        dest->period_us         += src->period_us;
        dest->period_guest_sys  += src->period_guest_sys;
        dest->period_guest_us   += src->period_guest_us;
        dest->nr_events         += src->nr_events;
        dest->weight            += src->weight;
}

static void he_stat__decay(struct he_stat *he_stat)
{
        he_stat->period = (he_stat->period * 7) / 8;
        he_stat->nr_events = (he_stat->nr_events * 7) / 8;
        /* XXX need decay for weight too? */
}

static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
{
        u64 prev_period = he->stat.period;
        u64 diff;

        if (prev_period == 0)
                return true;

        he_stat__decay(&he->stat);
        if (symbol_conf.cumulate_callchain)
                he_stat__decay(he->stat_acc);
        decay_callchain(he->callchain);

        diff = prev_period - he->stat.period;

        hists->stats.total_period -= diff;
        if (!he->filtered)
                hists->stats.total_non_filtered_period -= diff;

        return he->stat.period == 0;
}

static void hists__delete_entry(struct hists *hists, struct hist_entry *he)
{
        rb_erase(&he->rb_node, &hists->entries);

        if (sort__need_collapse)
                rb_erase(&he->rb_node_in, &hists->entries_collapsed);
        else
                rb_erase(&he->rb_node_in, hists->entries_in);

        --hists->nr_entries;
        if (!he->filtered)
                --hists->nr_non_filtered_entries;

        hist_entry__delete(he);
}

void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel)
{
        struct rb_node *next = rb_first(&hists->entries);
        struct hist_entry *n;

        while (next) {
                n = rb_entry(next, struct hist_entry, rb_node);
                next = rb_next(&n->rb_node);
                if (((zap_user && n->level == '.') ||
                     (zap_kernel && n->level != '.') ||
                     hists__decay_entry(hists, n))) {
                        hists__delete_entry(hists, n);
                }
        }
}

void hists__delete_entries(struct hists *hists)
{
        struct rb_node *next = rb_first(&hists->entries);
        struct hist_entry *n;

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

                hists__delete_entry(hists, n);
        }
}

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

static struct hist_entry *hist_entry__new(struct hist_entry *template,
                                          bool sample_self)
{
        size_t callchain_size = 0;
        struct hist_entry *he;

        if (symbol_conf.use_callchain)
                callchain_size = sizeof(struct callchain_root);

        he = zalloc(sizeof(*he) + callchain_size);

        if (he != NULL) {
                *he = *template;

                if (symbol_conf.cumulate_callchain) {
                        he->stat_acc = malloc(sizeof(he->stat));
                        if (he->stat_acc == NULL) {
                                free(he);
                                return NULL;
                        }
                        memcpy(he->stat_acc, &he->stat, sizeof(he->stat));
                        if (!sample_self)
                                memset(&he->stat, 0, sizeof(he->stat));
                }

                map__get(he->ms.map);

                if (he->branch_info) {
                        /*
                         * This branch info is (a part of) allocated from
                         * sample__resolve_bstack() and will be freed after
                         * adding new entries.  So we need to save a copy.
                         */
                        he->branch_info = malloc(sizeof(*he->branch_info));
                        if (he->branch_info == NULL) {
                                map__zput(he->ms.map);
                                free(he->stat_acc);
                                free(he);
                                return NULL;
                        }

                        memcpy(he->branch_info, template->branch_info,
                               sizeof(*he->branch_info));

                        map__get(he->branch_info->from.map);
                        map__get(he->branch_info->to.map);
                }

                if (he->mem_info) {
                        map__get(he->mem_info->iaddr.map);
                        map__get(he->mem_info->daddr.map);
                }

                if (symbol_conf.use_callchain)
                        callchain_init(he->callchain);

                if (he->raw_data) {
                        he->raw_data = memdup(he->raw_data, he->raw_size);

                        if (he->raw_data == NULL) {
                                map__put(he->ms.map);
                                if (he->branch_info) {
                                        map__put(he->branch_info->from.map);
                                        map__put(he->branch_info->to.map);
                                        free(he->branch_info);
                                }
                                if (he->mem_info) {
                                        map__put(he->mem_info->iaddr.map);
                                        map__put(he->mem_info->daddr.map);
                                }
                                free(he->stat_acc);
                                free(he);
                                return NULL;
                        }
                }
                INIT_LIST_HEAD(&he->pairs.node);
                thread__get(he->thread);
        }

        return he;
}

static u8 symbol__parent_filter(const struct symbol *parent)
{
        if (symbol_conf.exclude_other && parent == NULL)
                return 1 << HIST_FILTER__PARENT;
        return 0;
}

static struct hist_entry *hists__findnew_entry(struct hists *hists,
                                               struct hist_entry *entry,
                                               struct addr_location *al,
                                               bool sample_self)
{
        struct rb_node **p;
        struct rb_node *parent = NULL;
        struct hist_entry *he;
        int64_t cmp;
        u64 period = entry->stat.period;
        u64 weight = entry->stat.weight;

        p = &hists->entries_in->rb_node;

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

                /*
                 * Make sure that it receives arguments in a same order as
                 * hist_entry__collapse() so that we can use an appropriate
                 * function when searching an entry regardless which sort
                 * keys were used.
                 */
                cmp = hist_entry__cmp(he, entry);

                if (!cmp) {
                        if (sample_self) {
                                he_stat__add_period(&he->stat, period, weight);
                                hists->stats.total_period += period;
                                if (!he->filtered)
                                        hists->stats.total_non_filtered_period += period;
                        }
                        if (symbol_conf.cumulate_callchain)
                                he_stat__add_period(he->stat_acc, period, weight);

                        /*
                         * This mem info was allocated from sample__resolve_mem
                         * and will not be used anymore.
                         */
                        zfree(&entry->mem_info);

                        /* If the map of an existing hist_entry has
                         * become out-of-date due to an exec() or
                         * similar, update it.  Otherwise we will
                         * mis-adjust symbol addresses when computing
                         * the history counter to increment.
                         */
                        if (he->ms.map != entry->ms.map) {
                                map__put(he->ms.map);
                                he->ms.map = map__get(entry->ms.map);
                        }
                        goto out;
                }

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

        he = hist_entry__new(entry, sample_self);
        if (!he)
                return NULL;

        if (sample_self)
                hists__inc_stats(hists, he);
        else
                hists->nr_entries++;

        rb_link_node(&he->rb_node_in, parent, p);
        rb_insert_color(&he->rb_node_in, hists->entries_in);
out:
        if (sample_self)
                he_stat__add_cpumode_period(&he->stat, al->cpumode, period);
        if (symbol_conf.cumulate_callchain)
                he_stat__add_cpumode_period(he->stat_acc, al->cpumode, period);
        return he;
}

struct hist_entry *__hists__add_entry(struct hists *hists,
                                      struct addr_location *al,
                                      struct symbol *sym_parent,
                                      struct branch_info *bi,
                                      struct mem_info *mi,
                                      struct perf_sample *sample,
                                      bool sample_self)
{
        struct hist_entry entry = {
                .thread = al->thread,
                .comm = thread__comm(al->thread),
                .ms = {
                        .map    = al->map,
                        .sym    = al->sym,
                },
                .socket  = al->socket,
                .cpu     = al->cpu,
                .cpumode = al->cpumode,
                .ip      = al->addr,
                .level   = al->level,
                .stat = {
                        .nr_events = 1,
                        .period = sample->period,
                        .weight = sample->weight,
                },
                .parent = sym_parent,
                .filtered = symbol__parent_filter(sym_parent) | al->filtered,
                .hists  = hists,
                .branch_info = bi,
                .mem_info = mi,
                .transaction = sample->transaction,
                .raw_data = sample->raw_data,
                .raw_size = sample->raw_size,
        };

        return hists__findnew_entry(hists, &entry, al, sample_self);
}

static int
iter_next_nop_entry(struct hist_entry_iter *iter __maybe_unused,
                    struct addr_location *al __maybe_unused)
{
        return 0;
}

static int
iter_add_next_nop_entry(struct hist_entry_iter *iter __maybe_unused,
                        struct addr_location *al __maybe_unused)
{
        return 0;
}

static int
iter_prepare_mem_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        struct perf_sample *sample = iter->sample;
        struct mem_info *mi;

        mi = sample__resolve_mem(sample, al);
        if (mi == NULL)
                return -ENOMEM;

        iter->priv = mi;
        return 0;
}

static int
iter_add_single_mem_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        u64 cost;
        struct mem_info *mi = iter->priv;
        struct hists *hists = evsel__hists(iter->evsel);
        struct perf_sample *sample = iter->sample;
        struct hist_entry *he;

        if (mi == NULL)
                return -EINVAL;

        cost = sample->weight;
        if (!cost)
                cost = 1;

        /*
         * must pass period=weight in order to get the correct
         * sorting from hists__collapse_resort() which is solely
         * based on periods. We want sorting be done on nr_events * weight
         * and this is indirectly achieved by passing period=weight here
         * and the he_stat__add_period() function.
         */
        sample->period = cost;

        he = __hists__add_entry(hists, al, iter->parent, NULL, mi,
                                sample, true);
        if (!he)
                return -ENOMEM;

        iter->he = he;
        return 0;
}

static int
iter_finish_mem_entry(struct hist_entry_iter *iter,
                      struct addr_location *al __maybe_unused)
{
        struct perf_evsel *evsel = iter->evsel;
        struct hists *hists = evsel__hists(evsel);
        struct hist_entry *he = iter->he;
        int err = -EINVAL;

        if (he == NULL)
                goto out;

        hists__inc_nr_samples(hists, he->filtered);

        err = hist_entry__append_callchain(he, iter->sample);

out:
        /*
         * We don't need to free iter->priv (mem_info) here since the mem info
         * was either already freed in hists__findnew_entry() or passed to a
         * new hist entry by hist_entry__new().
         */
        iter->priv = NULL;

        iter->he = NULL;
        return err;
}

static int
iter_prepare_branch_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        struct branch_info *bi;
        struct perf_sample *sample = iter->sample;

        bi = sample__resolve_bstack(sample, al);
        if (!bi)
                return -ENOMEM;

        iter->curr = 0;
        iter->total = sample->branch_stack->nr;

        iter->priv = bi;
        return 0;
}

static int
iter_add_single_branch_entry(struct hist_entry_iter *iter __maybe_unused,
                             struct addr_location *al __maybe_unused)
{
        /* to avoid calling callback function */
        iter->he = NULL;

        return 0;
}

static int
iter_next_branch_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        struct branch_info *bi = iter->priv;
        int i = iter->curr;

        if (bi == NULL)
                return 0;

        if (iter->curr >= iter->total)
                return 0;

        al->map = bi[i].to.map;
        al->sym = bi[i].to.sym;
        al->addr = bi[i].to.addr;
        return 1;
}

static int
iter_add_next_branch_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        struct branch_info *bi;
        struct perf_evsel *evsel = iter->evsel;
        struct hists *hists = evsel__hists(evsel);
        struct perf_sample *sample = iter->sample;
        struct hist_entry *he = NULL;
        int i = iter->curr;
        int err = 0;

        bi = iter->priv;

        if (iter->hide_unresolved && !(bi[i].from.sym && bi[i].to.sym))
                goto out;

        /*
         * The report shows the percentage of total branches captured
         * and not events sampled. Thus we use a pseudo period of 1.
         */
        sample->period = 1;
        sample->weight = bi->flags.cycles ? bi->flags.cycles : 1;

        he = __hists__add_entry(hists, al, iter->parent, &bi[i], NULL,
                                sample, true);
        if (he == NULL)
                return -ENOMEM;

        hists__inc_nr_samples(hists, he->filtered);

out:
        iter->he = he;
        iter->curr++;
        return err;
}

static int
iter_finish_branch_entry(struct hist_entry_iter *iter,
                         struct addr_location *al __maybe_unused)
{
        zfree(&iter->priv);
        iter->he = NULL;

        return iter->curr >= iter->total ? 0 : -1;
}

static int
iter_prepare_normal_entry(struct hist_entry_iter *iter __maybe_unused,
                          struct addr_location *al __maybe_unused)
{
        return 0;
}

static int
iter_add_single_normal_entry(struct hist_entry_iter *iter, struct addr_location *al)
{
        struct perf_evsel *evsel = iter->evsel;
        struct perf_sample *sample = iter->sample;
        struct hist_entry *he;

        he = __hists__add_entry(evsel__hists(evsel), al, iter->parent, NULL, NULL,
                                sample, true);
        if (he == NULL)
                return -ENOMEM;

        iter->he = he;
        return 0;
}

static int
iter_finish_normal_entry(struct hist_entry_iter *iter,
                         struct addr_location *al __maybe_unused)
{
        struct hist_entry *he = iter->he;
        struct perf_evsel *evsel = iter->evsel;
        struct perf_sample *sample = iter->sample;

        if (he == NULL)
                return 0;

        iter->he = NULL;

        hists__inc_nr_samples(evsel__hists(evsel), he->filtered);

        return hist_entry__append_callchain(he, sample);
}

static int
iter_prepare_cumulative_entry(struct hist_entry_iter *iter,
                              struct addr_location *al __maybe_unused)
{
        struct hist_entry **he_cache;

        callchain_cursor_commit(&callchain_cursor);

        /*
         * This is for detecting cycles or recursions so that they're
         * cumulated only one time to prevent entries more than 100%
         * overhead.
         */
        he_cache = malloc(sizeof(*he_cache) * (iter->max_stack + 1));
        if (he_cache == NULL)
                return -ENOMEM;

        iter->priv = he_cache;
        iter->curr = 0;

        return 0;
}

static int
iter_add_single_cumulative_entry(struct hist_entry_iter *iter,
                                 struct addr_location *al)
{
        struct perf_evsel *evsel = iter->evsel;
        struct hists *hists = evsel__hists(evsel);
        struct perf_sample *sample = iter->sample;
        struct hist_entry **he_cache = iter->priv;
        struct hist_entry *he;
        int err = 0;

        he = __hists__add_entry(hists, al, iter->parent, NULL, NULL,
                                sample, true);
        if (he == NULL)
                return -ENOMEM;

        iter->he = he;
        he_cache[iter->curr++] = he;

        hist_entry__append_callchain(he, sample);

        /*
         * We need to re-initialize the cursor since callchain_append()
         * advanced the cursor to the end.
         */
        callchain_cursor_commit(&callchain_cursor);

        hists__inc_nr_samples(hists, he->filtered);

        return err;
}

static int
iter_next_cumulative_entry(struct hist_entry_iter *iter,
                           struct addr_location *al)
{
        struct callchain_cursor_node *node;

        node = callchain_cursor_current(&callchain_cursor);
        if (node == NULL)
                return 0;

        return fill_callchain_info(al, node, iter->hide_unresolved);
}

static int
iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
                               struct addr_location *al)
{
        struct perf_evsel *evsel = iter->evsel;
        struct perf_sample *sample = iter->sample;
        struct hist_entry **he_cache = iter->priv;
        struct hist_entry *he;
        struct hist_entry he_tmp = {
                .hists = evsel__hists(evsel),
                .cpu = al->cpu,
                .thread = al->thread,
                .comm = thread__comm(al->thread),
                .ip = al->addr,
                .ms = {
                        .map = al->map,
                        .sym = al->sym,
                },
                .parent = iter->parent,
                .raw_data = sample->raw_data,
                .raw_size = sample->raw_size,
        };
        int i;
        struct callchain_cursor cursor;

        callchain_cursor_snapshot(&cursor, &callchain_cursor);

        callchain_cursor_advance(&callchain_cursor);

        /*
         * Check if there's duplicate entries in the callchain.
         * It's possible that it has cycles or recursive calls.
         */
        for (i = 0; i < iter->curr; i++) {
                if (hist_entry__cmp(he_cache[i], &he_tmp) == 0) {
                        /* to avoid calling callback function */
                        iter->he = NULL;
                        return 0;
                }
        }

        he = __hists__add_entry(evsel__hists(evsel), al, iter->parent, NULL, NULL,
                                sample, false);
        if (he == NULL)
                return -ENOMEM;

        iter->he = he;
        he_cache[iter->curr++] = he;

        if (symbol_conf.use_callchain)
                callchain_append(he->callchain, &cursor, sample->period);
        return 0;
}

static int
iter_finish_cumulative_entry(struct hist_entry_iter *iter,
                             struct addr_location *al __maybe_unused)
{
        zfree(&iter->priv);
        iter->he = NULL;

        return 0;
}

const struct hist_iter_ops hist_iter_mem = {
        .prepare_entry          = iter_prepare_mem_entry,
        .add_single_entry       = iter_add_single_mem_entry,
        .next_entry             = iter_next_nop_entry,
        .add_next_entry         = iter_add_next_nop_entry,
        .finish_entry           = iter_finish_mem_entry,
};

const struct hist_iter_ops hist_iter_branch = {
        .prepare_entry          = iter_prepare_branch_entry,
        .add_single_entry       = iter_add_single_branch_entry,
        .next_entry             = iter_next_branch_entry,
        .add_next_entry         = iter_add_next_branch_entry,
        .finish_entry           = iter_finish_branch_entry,
};

const struct hist_iter_ops hist_iter_normal = {
        .prepare_entry          = iter_prepare_normal_entry,
        .add_single_entry       = iter_add_single_normal_entry,
        .next_entry             = iter_next_nop_entry,
        .add_next_entry         = iter_add_next_nop_entry,
        .finish_entry           = iter_finish_normal_entry,
};

const struct hist_iter_ops hist_iter_cumulative = {
        .prepare_entry          = iter_prepare_cumulative_entry,
        .add_single_entry       = iter_add_single_cumulative_entry,
        .next_entry             = iter_next_cumulative_entry,
        .add_next_entry         = iter_add_next_cumulative_entry,
        .finish_entry           = iter_finish_cumulative_entry,
};

int hist_entry_iter__add(struct hist_entry_iter *iter, struct addr_location *al,
                         int max_stack_depth, void *arg)
{
        int err, err2;

        err = sample__resolve_callchain(iter->sample, &iter->parent,
                                        iter->evsel, al, max_stack_depth);
        if (err)
                return err;

        iter->max_stack = max_stack_depth;

        err = iter->ops->prepare_entry(iter, al);
        if (err)
                goto out;

        err = iter->ops->add_single_entry(iter, al);
        if (err)
                goto out;

        if (iter->he && iter->add_entry_cb) {
                err = iter->add_entry_cb(iter, al, true, arg);
                if (err)
                        goto out;
        }

        while (iter->ops->next_entry(iter, al)) {
                err = iter->ops->add_next_entry(iter, al);
                if (err)
                        break;

                if (iter->he && iter->add_entry_cb) {
                        err = iter->add_entry_cb(iter, al, false, arg);
                        if (err)
                                goto out;
                }
        }

out:
        err2 = iter->ops->finish_entry(iter, al);
        if (!err)
                err = err2;

        return err;
}

int64_t
hist_entry__cmp(struct hist_entry *left, struct hist_entry *right)
{
        struct perf_hpp_fmt *fmt;
        int64_t cmp = 0;

        perf_hpp__for_each_sort_list(fmt) {
                cmp = fmt->cmp(fmt, left, right);
                if (cmp)
                        break;
        }

        return cmp;
}

int64_t
hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
{
        struct perf_hpp_fmt *fmt;
        int64_t cmp = 0;

        perf_hpp__for_each_sort_list(fmt) {
                cmp = fmt->collapse(fmt, left, right);
                if (cmp)
                        break;
        }

        return cmp;
}

void hist_entry__delete(struct hist_entry *he)
{
        thread__zput(he->thread);
        map__zput(he->ms.map);

        if (he->branch_info) {
                map__zput(he->branch_info->from.map);
                map__zput(he->branch_info->to.map);
                zfree(&he->branch_info);
        }

        if (he->mem_info) {
                map__zput(he->mem_info->iaddr.map);
                map__zput(he->mem_info->daddr.map);
                zfree(&he->mem_info);
        }

        zfree(&he->stat_acc);
        free_srcline(he->srcline);
        if (he->srcfile && he->srcfile[0])
                free(he->srcfile);
        free_callchain(he->callchain);
        free(he->trace_output);
        free(he->raw_data);
        free(he);
}

/*
 * collapse the histogram
 */

bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
                                  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_in);

                cmp = hist_entry__collapse(iter, he);

                if (!cmp) {
                        he_stat__add_stat(&iter->stat, &he->stat);
                        if (symbol_conf.cumulate_callchain)
                                he_stat__add_stat(iter->stat_acc, he->stat_acc);

                        if (symbol_conf.use_callchain) {
                                callchain_cursor_reset(&callchain_cursor);
                                callchain_merge(&callchain_cursor,
                                                iter->callchain,
                                                he->callchain);
                        }
                        hist_entry__delete(he);
                        return false;
                }

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

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

struct rb_root *hists__get_rotate_entries_in(struct hists *hists)
{
        struct rb_root *root;

        pthread_mutex_lock(&hists->lock);

        root = hists->entries_in;
        if (++hists->entries_in > &hists->entries_in_array[1])
                hists->entries_in = &hists->entries_in_array[0];

        pthread_mutex_unlock(&hists->lock);

        return root;
}

static void hists__apply_filters(struct hists *hists, struct hist_entry *he)
{
        hists__filter_entry_by_dso(hists, he);
        hists__filter_entry_by_thread(hists, he);
        hists__filter_entry_by_symbol(hists, he);
        hists__filter_entry_by_socket(hists, he);
}

void hists__collapse_resort(struct hists *hists, struct ui_progress *prog)
{
        struct rb_root *root;
        struct rb_node *next;
        struct hist_entry *n;

        if (!sort__need_collapse)
                return;

        hists->nr_entries = 0;

        root = hists__get_rotate_entries_in(hists);

        next = rb_first(root);

        while (next) {
                if (session_done())
                        break;
                n = rb_entry(next, struct hist_entry, rb_node_in);
                next = rb_next(&n->rb_node_in);

                rb_erase(&n->rb_node_in, root);
                if (hists__collapse_insert_entry(hists, &hists->entries_collapsed, n)) {
                        /*
                         * If it wasn't combined with one of the entries already
                         * collapsed, we need to apply the filters that may have
                         * been set by, say, the hist_browser.
                         */
                        hists__apply_filters(hists, n);
                }
                if (prog)
                        ui_progress__update(prog, 1);
        }
}

static int hist_entry__sort(struct hist_entry *a, struct hist_entry *b)
{
        struct perf_hpp_fmt *fmt;
        int64_t cmp = 0;

        perf_hpp__for_each_sort_list(fmt) {
                if (perf_hpp__should_skip(fmt, a->hists))
                        continue;

                cmp = fmt->sort(fmt, a, b);
                if (cmp)
                        break;
        }

        return cmp;
}

static void hists__reset_filter_stats(struct hists *hists)
{
        hists->nr_non_filtered_entries = 0;
        hists->stats.total_non_filtered_period = 0;
}

void hists__reset_stats(struct hists *hists)
{
        hists->nr_entries = 0;
        hists->stats.total_period = 0;

        hists__reset_filter_stats(hists);
}

static void hists__inc_filter_stats(struct hists *hists, struct hist_entry *h)
{
        hists->nr_non_filtered_entries++;
        hists->stats.total_non_filtered_period += h->stat.period;
}

void hists__inc_stats(struct hists *hists, struct hist_entry *h)
{
        if (!h->filtered)
                hists__inc_filter_stats(hists, h);

        hists->nr_entries++;
        hists->stats.total_period += h->stat.period;
}

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

        if (use_callchain) {
                if (callchain_param.mode == CHAIN_GRAPH_REL) {
                        u64 total = he->stat.period;

                        if (symbol_conf.cumulate_callchain)
                                total = he->stat_acc->period;

                        min_callchain_hits = total * (callchain_param.min_percent / 100);
                }
                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 (hist_entry__sort(he, iter) > 0)
                        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 *hists, struct ui_progress *prog)
{
        struct rb_root *root;
        struct rb_node *next;
        struct hist_entry *n;
        u64 min_callchain_hits;
        struct perf_evsel *evsel = hists_to_evsel(hists);
        bool use_callchain;

        if (evsel && symbol_conf.use_callchain && !symbol_conf.show_ref_callgraph)
                use_callchain = evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN;
        else
                use_callchain = symbol_conf.use_callchain;

        min_callchain_hits = hists__total_period(hists) * (callchain_param.min_percent / 100);

        if (sort__need_collapse)
                root = &hists->entries_collapsed;
        else
                root = hists->entries_in;

        next = rb_first(root);
        hists->entries = RB_ROOT;

        hists__reset_stats(hists);
        hists__reset_col_len(hists);

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

                __hists__insert_output_entry(&hists->entries, n, min_callchain_hits, use_callchain);
                hists__inc_stats(hists, n);

                if (!n->filtered)
                        hists__calc_col_len(hists, n);

                if (prog)
                        ui_progress__update(prog, 1);
        }
}

static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h,
                                       enum hist_filter filter)
{
        h->filtered &= ~(1 << filter);
        if (h->filtered)
                return;

        /* force fold unfiltered entry for simplicity */
        h->unfolded = false;
        h->row_offset = 0;
        h->nr_rows = 0;

        hists->stats.nr_non_filtered_samples += h->stat.nr_events;

        hists__inc_filter_stats(hists, h);
        hists__calc_col_len(hists, h);
}


static bool hists__filter_entry_by_dso(struct hists *hists,
                                       struct hist_entry *he)
{
        if (hists->dso_filter != NULL &&
            (he->ms.map == NULL || he->ms.map->dso != hists->dso_filter)) {
                he->filtered |= (1 << HIST_FILTER__DSO);
                return true;
        }

        return false;
}

static bool hists__filter_entry_by_thread(struct hists *hists,
                                          struct hist_entry *he)
{
        if (hists->thread_filter != NULL &&
            he->thread != hists->thread_filter) {
                he->filtered |= (1 << HIST_FILTER__THREAD);
                return true;
        }

        return false;
}

static bool hists__filter_entry_by_symbol(struct hists *hists,
                                          struct hist_entry *he)
{
        if (hists->symbol_filter_str != NULL &&
            (!he->ms.sym || strstr(he->ms.sym->name,
                                   hists->symbol_filter_str) == NULL)) {
                he->filtered |= (1 << HIST_FILTER__SYMBOL);
                return true;
        }

        return false;
}

static bool hists__filter_entry_by_socket(struct hists *hists,
                                          struct hist_entry *he)
{
        if ((hists->socket_filter > -1) &&
            (he->socket != hists->socket_filter)) {
                he->filtered |= (1 << HIST_FILTER__SOCKET);
                return true;
        }

        return false;
}

typedef bool (*filter_fn_t)(struct hists *hists, struct hist_entry *he);

static void hists__filter_by_type(struct hists *hists, int type, filter_fn_t filter)
{
        struct rb_node *nd;

        hists->stats.nr_non_filtered_samples = 0;

        hists__reset_filter_stats(hists);
        hists__reset_col_len(hists);

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

                if (filter(hists, h))
                        continue;

                hists__remove_entry_filter(hists, h, type);
        }
}

void hists__filter_by_thread(struct hists *hists)
{
        hists__filter_by_type(hists, HIST_FILTER__THREAD,
                              hists__filter_entry_by_thread);
}

void hists__filter_by_dso(struct hists *hists)
{
        hists__filter_by_type(hists, HIST_FILTER__DSO,
                              hists__filter_entry_by_dso);
}

void hists__filter_by_symbol(struct hists *hists)
{
        hists__filter_by_type(hists, HIST_FILTER__SYMBOL,
                              hists__filter_entry_by_symbol);
}

void hists__filter_by_socket(struct hists *hists)
{
        hists__filter_by_type(hists, HIST_FILTER__SOCKET,
                              hists__filter_entry_by_socket);
}

void events_stats__inc(struct events_stats *stats, u32 type)
{
        ++stats->nr_events[0];
        ++stats->nr_events[type];
}

void hists__inc_nr_events(struct hists *hists, u32 type)
{
        events_stats__inc(&hists->stats, type);
}

void hists__inc_nr_samples(struct hists *hists, bool filtered)
{
        events_stats__inc(&hists->stats, PERF_RECORD_SAMPLE);
        if (!filtered)
                hists->stats.nr_non_filtered_samples++;
}

static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
                                                 struct hist_entry *pair)
{
        struct rb_root *root;
        struct rb_node **p;
        struct rb_node *parent = NULL;
        struct hist_entry *he;
        int64_t cmp;

        if (sort__need_collapse)
                root = &hists->entries_collapsed;
        else
                root = hists->entries_in;

        p = &root->rb_node;

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

                cmp = hist_entry__collapse(he, pair);

                if (!cmp)
                        goto out;

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

        he = hist_entry__new(pair, true);
        if (he) {
                memset(&he->stat, 0, sizeof(he->stat));
                he->hists = hists;
                rb_link_node(&he->rb_node_in, parent, p);
                rb_insert_color(&he->rb_node_in, root);
                hists__inc_stats(hists, he);
                he->dummy = true;
        }
out:
        return he;
}

static struct hist_entry *hists__find_entry(struct hists *hists,
                                            struct hist_entry *he)
{
        struct rb_node *n;

        if (sort__need_collapse)
                n = hists->entries_collapsed.rb_node;
        else
                n = hists->entries_in->rb_node;

        while (n) {
                struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node_in);
                int64_t cmp = hist_entry__collapse(iter, he);

                if (cmp < 0)
                        n = n->rb_left;
                else if (cmp > 0)
                        n = n->rb_right;
                else
                        return iter;
        }

        return NULL;
}

/*
 * Look for pairs to link to the leader buckets (hist_entries):
 */
void hists__match(struct hists *leader, struct hists *other)
{
        struct rb_root *root;
        struct rb_node *nd;
        struct hist_entry *pos, *pair;

        if (sort__need_collapse)
                root = &leader->entries_collapsed;
        else
                root = leader->entries_in;

        for (nd = rb_first(root); nd; nd = rb_next(nd)) {
                pos  = rb_entry(nd, struct hist_entry, rb_node_in);
                pair = hists__find_entry(other, pos);

                if (pair)
                        hist_entry__add_pair(pair, pos);
        }
}

/*
 * Look for entries in the other hists that are not present in the leader, if
 * we find them, just add a dummy entry on the leader hists, with period=0,
 * nr_events=0, to serve as the list header.
 */
int hists__link(struct hists *leader, struct hists *other)
{
        struct rb_root *root;
        struct rb_node *nd;
        struct hist_entry *pos, *pair;

        if (sort__need_collapse)
                root = &other->entries_collapsed;
        else
                root = other->entries_in;

        for (nd = rb_first(root); nd; nd = rb_next(nd)) {
                pos = rb_entry(nd, struct hist_entry, rb_node_in);

                if (!hist_entry__has_pairs(pos)) {
                        pair = hists__add_dummy_entry(leader, pos);
                        if (pair == NULL)
                                return -1;
                        hist_entry__add_pair(pos, pair);
                }
        }

        return 0;
}

void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
                          struct perf_sample *sample, bool nonany_branch_mode)
{
        struct branch_info *bi;

        /* If we have branch cycles always annotate them. */
        if (bs && bs->nr && bs->entries[0].flags.cycles) {
                int i;

                bi = sample__resolve_bstack(sample, al);
                if (bi) {
                        struct addr_map_symbol *prev = NULL;

                        /*
                         * Ignore errors, still want to process the
                         * other entries.
                         *
                         * For non standard branch modes always
                         * force no IPC (prev == NULL)
                         *
                         * Note that perf stores branches reversed from
                         * program order!
                         */
                        for (i = bs->nr - 1; i >= 0; i--) {
                                addr_map_symbol__account_cycles(&bi[i].from,
                                        nonany_branch_mode ? NULL : prev,
                                        bi[i].flags.cycles);
                                prev = &bi[i].to;
                        }
                        free(bi);
                }
        }
}

size_t perf_evlist__fprintf_nr_events(struct perf_evlist *evlist, FILE *fp)
{
        struct perf_evsel *pos;
        size_t ret = 0;

        evlist__for_each(evlist, pos) {
                ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
                ret += events_stats__fprintf(&evsel__hists(pos)->stats, fp);
        }

        return ret;
}


u64 hists__total_period(struct hists *hists)
{
        return symbol_conf.filter_relative ? hists->stats.total_non_filtered_period :
                hists->stats.total_period;
}

int parse_filter_percentage(const struct option *opt __maybe_unused,
                            const char *arg, int unset __maybe_unused)
{
        if (!strcmp(arg, "relative"))
                symbol_conf.filter_relative = true;
        else if (!strcmp(arg, "absolute"))
                symbol_conf.filter_relative = false;
        else
                return -1;

        return 0;
}

int perf_hist_config(const char *var, const char *value)
{
        if (!strcmp(var, "hist.percentage"))
                return parse_filter_percentage(NULL, value, 0);

        return 0;
}

int __hists__init(struct hists *hists)
{
        memset(hists, 0, sizeof(*hists));
        hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
        hists->entries_in = &hists->entries_in_array[0];
        hists->entries_collapsed = RB_ROOT;
        hists->entries = RB_ROOT;
        pthread_mutex_init(&hists->lock, NULL);
        hists->socket_filter = -1;
        return 0;
}

static void hists__delete_remaining_entries(struct rb_root *root)
{
        struct rb_node *node;
        struct hist_entry *he;

        while (!RB_EMPTY_ROOT(root)) {
                node = rb_first(root);
                rb_erase(node, root);

                he = rb_entry(node, struct hist_entry, rb_node_in);
                hist_entry__delete(he);
        }
}

static void hists__delete_all_entries(struct hists *hists)
{
        hists__delete_entries(hists);
        hists__delete_remaining_entries(&hists->entries_in_array[0]);
        hists__delete_remaining_entries(&hists->entries_in_array[1]);
        hists__delete_remaining_entries(&hists->entries_collapsed);
}

static void hists_evsel__exit(struct perf_evsel *evsel)
{
        struct hists *hists = evsel__hists(evsel);

        hists__delete_all_entries(hists);
}

static int hists_evsel__init(struct perf_evsel *evsel)
{
        struct hists *hists = evsel__hists(evsel);

        __hists__init(hists);
        return 0;
}

/*
 * XXX We probably need a hists_evsel__exit() to free the hist_entries
 * stored in the rbtree...
 */

int hists__init(void)
{
        int err = perf_evsel__object_config(sizeof(struct hists_evsel),
                                            hists_evsel__init,
                                            hists_evsel__exit);
        if (err)
                fputs("FATAL ERROR: Couldn't setup hists class\n", stderr);

        return err;
}