Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[mirror_ubuntu-zesty-kernel.git] / tools / perf / util / hist.c

#include "annotate.h"
#include "util.h"
#include "build-id.h"
#include "hist.h"
#include "session.h"
#include "sort.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);

enum hist_filter {
        HIST_FILTER__DSO,
        HIST_FILTER__THREAD,
        HIST_FILTER__PARENT,
        HIST_FILTER__SYMBOL,
};

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

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;
}

static 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);
}

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

        if (h->ms.sym)
                hists__new_col_len(hists, HISTC_SYMBOL, h->ms.sym->namelen + 4);
        else
                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->branch_info) {
                int symlen;
                /*
                 * +4 accounts for '[x] ' priv level info
                 * +2 account of 0x prefix on raw addresses
                 */
                if (h->branch_info->from.sym) {
                        symlen = (int)h->branch_info->from.sym->namelen + 4;
                        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;
                        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);
                }
        }
}

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

static void hist_entry__decay(struct hist_entry *he)
{
        he->period = (he->period * 7) / 8;
        he->nr_events = (he->nr_events * 7) / 8;
}

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

        if (prev_period == 0)
                return true;

        hist_entry__decay(he);

        if (!he->filtered)
                hists->stats.total_period -= prev_period - he->period;

        return he->period == 0;
}

static void __hists__decay_entries(struct hists *hists, bool zap_user,
                                   bool zap_kernel, bool threaded)
{
        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);
                /*
                 * We may be annotating this, for instance, so keep it here in
                 * case some it gets new samples, we'll eventually free it when
                 * the user stops browsing and it agains gets fully decayed.
                 */
                if (((zap_user && n->level == '.') ||
                     (zap_kernel && n->level != '.') ||
                     hists__decay_entry(hists, n)) &&
                    !n->used) {
                        rb_erase(&n->rb_node, &hists->entries);

                        if (sort__need_collapse || threaded)
                                rb_erase(&n->rb_node_in, &hists->entries_collapsed);

                        hist_entry__free(n);
                        --hists->nr_entries;
                }
        }
}

void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel)
{
        return __hists__decay_entries(hists, zap_user, zap_kernel, false);
}

void hists__decay_entries_threaded(struct hists *hists,
                                   bool zap_user, bool zap_kernel)
{
        return __hists__decay_entries(hists, zap_user, zap_kernel, true);
}

/*
 * 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_root) : 0;
        struct hist_entry *he = malloc(sizeof(*he) + callchain_size);

        if (he != NULL) {
                *he = *template;
                he->nr_events = 1;
                if (he->ms.map)
                        he->ms.map->referenced = true;
                if (symbol_conf.use_callchain)
                        callchain_init(he->callchain);
        }

        return he;
}

static void hists__inc_nr_entries(struct hists *hists, struct hist_entry *h)
{
        if (!h->filtered) {
                hists__calc_col_len(hists, h);
                ++hists->nr_entries;
                hists->stats.total_period += h->period;
        }
}

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 *add_hist_entry(struct hists *hists,
                                      struct hist_entry *entry,
                                      struct addr_location *al,
                                      u64 period)
{
        struct rb_node **p;
        struct rb_node *parent = NULL;
        struct hist_entry *he;
        int cmp;

        pthread_mutex_lock(&hists->lock);

        p = &hists->entries_in->rb_node;

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

                cmp = hist_entry__cmp(entry, he);

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

                        /* 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) {
                                he->ms.map = entry->ms.map;
                                if (he->ms.map)
                                        he->ms.map->referenced = true;
                        }
                        goto out;
                }

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

        he = hist_entry__new(entry);
        if (!he)
                goto out_unlock;

        rb_link_node(&he->rb_node_in, parent, p);
        rb_insert_color(&he->rb_node_in, hists->entries_in);
out:
        hist_entry__add_cpumode_period(he, al->cpumode, period);
out_unlock:
        pthread_mutex_unlock(&hists->lock);
        return he;
}

struct hist_entry *__hists__add_branch_entry(struct hists *self,
                                             struct addr_location *al,
                                             struct symbol *sym_parent,
                                             struct branch_info *bi,
                                             u64 period)
{
        struct hist_entry entry = {
                .thread = al->thread,
                .ms = {
                        .map    = bi->to.map,
                        .sym    = bi->to.sym,
                },
                .cpu    = al->cpu,
                .ip     = bi->to.addr,
                .level  = al->level,
                .period = period,
                .parent = sym_parent,
                .filtered = symbol__parent_filter(sym_parent),
                .branch_info = bi,
        };

        return add_hist_entry(self, &entry, al, period);
}

struct hist_entry *__hists__add_entry(struct hists *self,
                                      struct addr_location *al,
                                      struct symbol *sym_parent, u64 period)
{
        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,
                .filtered = symbol__parent_filter(sym_parent),
        };

        return add_hist_entry(self, &entry, al, period);
}

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 hists__collapse_insert_entry(struct hists *hists,
                                         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) {
                        iter->period += he->period;
                        iter->nr_events += he->nr_events;
                        if (symbol_conf.use_callchain) {
                                callchain_cursor_reset(&hists->callchain_cursor);
                                callchain_merge(&hists->callchain_cursor, iter->callchain,
                                                he->callchain);
                        }
                        hist_entry__free(he);
                        return false;
                }

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

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

static 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);
}

static void __hists__collapse_resort(struct hists *hists, bool threaded)
{
        struct rb_root *root;
        struct rb_node *next;
        struct hist_entry *n;

        if (!sort__need_collapse && !threaded)
                return;

        root = hists__get_rotate_entries_in(hists);
        next = rb_first(root);

        while (next) {
                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);
                }
        }
}

void hists__collapse_resort(struct hists *hists)
{
        return __hists__collapse_resort(hists, false);
}

void hists__collapse_resort_threaded(struct hists *hists)
{
        return __hists__collapse_resort(hists, true);
}

/*
 * 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);
}

static void __hists__output_resort(struct hists *hists, bool threaded)
{
        struct rb_root *root;
        struct rb_node *next;
        struct hist_entry *n;
        u64 min_callchain_hits;

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

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

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

        hists->nr_entries = 0;
        hists->stats.total_period = 0;
        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);
                hists__inc_nr_entries(hists, n);
        }
}

void hists__output_resort(struct hists *hists)
{
        return __hists__output_resort(hists, false);
}

void hists__output_resort_threaded(struct hists *hists)
{
        return __hists__output_resort(hists, true);
}

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, u64 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, "0x%0" PRIx64 "\n", 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 rb_root *root,
                                         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 remaining;
        size_t ret = 0;
        int i;
        uint entries_printed = 0;

        remaining = total_samples;

        node = rb_first(root);
        while (node) {
                u64 new_total;
                u64 cumul;

                child = rb_entry(node, struct callchain_node, rb_node);
                cumul = callchain_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++,
                                                      total_samples,
                                                      cumul,
                                                      left_margin);
                }

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

                ret += __callchain__fprintf_graph(fp, &child->rb_root, 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 != total_samples) {

                if (!rem_sq_bracket)
                        return ret;

                new_depth_mask &= ~(1 << (depth - 1));
                ret += ipchain__fprintf_graph(fp, &rem_hits, depth,
                                              new_depth_mask, 0, total_samples,
                                              remaining, left_margin);
        }

        return ret;
}

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

        /*
         * If have one single callchain root, don't bother printing
         * its percentage (100 % in fractal mode and the same percentage
         * than the hist in graph mode). This also avoid one level of column.
         */
        node = rb_first(root);
        if (node && !rb_next(node)) {
                cnode = rb_entry(node, struct callchain_node, rb_node);
                list_for_each_entry(chain, &cnode->val, list) {
                        /*
                         * If we sort by symbol, the first entry is the same than
                         * the symbol. No need to print it otherwise it appears as
                         * displayed twice.
                         */
                        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;
                }
                root = &cnode->rb_root;
        }

        return __callchain__fprintf_graph(fp, root, total_samples,
                                          1, 1, left_margin);
}

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 callchain__fprintf_flat(FILE *fp, struct rb_root *self,
                                      u64 total_samples)
{
        size_t ret = 0;
        u32 entries_printed = 0;
        struct rb_node *rb_node;
        struct callchain_node *chain;

        rb_node = rb_first(self);
        while (rb_node) {
                double percent;

                chain = rb_entry(rb_node, struct callchain_node, rb_node);
                percent = chain->hit * 100.0 / total_samples;

                ret = percent_color_fprintf(fp, "           %6.2f%%\n", percent);
                ret += __callchain__fprintf_flat(fp, chain, total_samples);
                ret += fprintf(fp, "\n");
                if (++entries_printed == callchain_param.print_limit)
                        break;

                rb_node = rb_next(rb_node);
        }

        return ret;
}

static size_t hist_entry_callchain__fprintf(struct hist_entry *he,
                                            u64 total_samples, int left_margin,
                                            FILE *fp)
{
        switch (callchain_param.mode) {
        case CHAIN_GRAPH_REL:
                return callchain__fprintf_graph(fp, &he->sorted_chain, he->period,
                                                left_margin);
                break;
        case CHAIN_GRAPH_ABS:
                return callchain__fprintf_graph(fp, &he->sorted_chain, total_samples,
                                                left_margin);
                break;
        case CHAIN_FLAT:
                return callchain__fprintf_flat(fp, &he->sorted_chain, total_samples);
                break;
        case CHAIN_NONE:
                break;
        default:
                pr_err("Bad callchain mode\n");
        }

        return 0;
}

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 int hist_entry__pcnt_snprintf(struct hist_entry *he, char *s,
                                     size_t size, struct hists *pair_hists,
                                     bool show_displacement, long displacement,
                                     bool color, u64 total_period)
{
        u64 period, total, period_sys, period_us, period_guest_sys, period_guest_us;
        u64 nr_events;
        const char *sep = symbol_conf.field_sep;
        int ret;

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

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

        if (total) {
                if (color)
                        ret = percent_color_snprintf(s, size,
                                                     sep ? "%.2f" : "   %6.2f%%",
                                                     (period * 100.0) / total);
                else
                        ret = scnprintf(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 = scnprintf(s, size, sep ? "%" PRIu64 : "%12" PRIu64 " ", period);

        if (symbol_conf.show_nr_samples) {
                if (sep)
                        ret += scnprintf(s + ret, size - ret, "%c%" PRIu64, *sep, nr_events);
                else
                        ret += scnprintf(s + ret, size - ret, "%11" PRIu64, nr_events);
        }

        if (symbol_conf.show_total_period) {
                if (sep)
                        ret += scnprintf(s + ret, size - ret, "%c%" PRIu64, *sep, period);
                else
                        ret += scnprintf(s + ret, size - ret, " %12" PRIu64, 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 (total_period > 0)
                        new_percent = (he->period * 100.0) / total_period;

                diff = new_percent - old_percent;

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

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

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

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

        return ret;
}

int hist_entry__snprintf(struct hist_entry *he, char *s, size_t size,
                         struct hists *hists)
{
        const char *sep = symbol_conf.field_sep;
        struct sort_entry *se;
        int ret = 0;

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

                ret += scnprintf(s + ret, size - ret, "%s", sep ?: "  ");
                ret += se->se_snprintf(he, s + ret, size - ret,
                                       hists__col_len(hists, se->se_width_idx));
        }

        return ret;
}

static int hist_entry__fprintf(struct hist_entry *he, size_t size,
                               struct hists *hists, struct hists *pair_hists,
                               bool show_displacement, long displacement,
                               u64 total_period, FILE *fp)
{
        char bf[512];
        int ret;

        if (size == 0 || size > sizeof(bf))
                size = sizeof(bf);

        ret = hist_entry__pcnt_snprintf(he, bf, size, pair_hists,
                                        show_displacement, displacement,
                                        true, total_period);
        hist_entry__snprintf(he, bf + ret, size - ret, hists);
        return fprintf(fp, "%s\n", bf);
}

static size_t hist_entry__fprintf_callchain(struct hist_entry *he,
                                            struct hists *hists,
                                            u64 total_period, FILE *fp)
{
        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 = hists__col_len(hists, se->se_width_idx);
                left_margin -= thread__comm_len(he->thread);
        }

        return hist_entry_callchain__fprintf(he, total_period, left_margin, fp);
}

size_t hists__fprintf(struct hists *hists, struct hists *pair,
                      bool show_displacement, bool show_header, int max_rows,
                      int max_cols, FILE *fp)
{
        struct sort_entry *se;
        struct rb_node *nd;
        size_t ret = 0;
        u64 total_period;
        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;
        int nr_rows = 0;

        init_rem_hits();

        if (!show_header)
                goto print_entries;

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

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

        if (symbol_conf.show_total_period) {
                if (sep)
                        ret += fprintf(fp, "%cPeriod", *sep);
                else
                        ret += fprintf(fp, "   Period    ");
        }

        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 (symbol_conf.col_width_list_str) {
                        if (col_width) {
                                hists__set_col_len(hists, se->se_width_idx,
                                                   atoi(col_width));
                                col_width = strchr(col_width, ',');
                                if (col_width)
                                        ++col_width;
                        }
                }
                if (!hists__new_col_len(hists, se->se_width_idx, width))
                        width = hists__col_len(hists, se->se_width_idx);
                fprintf(fp, "  %*s", width, se->se_header);
        }

        fprintf(fp, "\n");
        if (max_rows && ++nr_rows >= max_rows)
                goto out;

        if (sep)
                goto print_entries;

        fprintf(fp, "# ........");
        if (symbol_conf.show_cpu_utilization)
                fprintf(fp, "   .......   .......");
        if (symbol_conf.show_nr_samples)
                fprintf(fp, " ..........");
        if (symbol_conf.show_total_period)
                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, "  ");
                width = hists__col_len(hists, se->se_width_idx);
                if (width == 0)
                        width = strlen(se->se_header);
                for (i = 0; i < width; i++)
                        fprintf(fp, ".");
        }

        fprintf(fp, "\n");
        if (max_rows && ++nr_rows >= max_rows)
                goto out;

        fprintf(fp, "#\n");
        if (max_rows && ++nr_rows >= max_rows)
                goto out;

print_entries:
        total_period = hists->stats.total_period;

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

                if (h->filtered)
                        continue;

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

                if (symbol_conf.use_callchain)
                        ret += hist_entry__fprintf_callchain(h, hists, total_period, fp);
                if (max_rows && ++nr_rows >= max_rows)
                        goto out;

                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);
                }
        }
out:
        free(rem_sq_bracket);

        return ret;
}

/*
 * See hists__fprintf to match the column widths
 */
unsigned int hists__sort_list_width(struct hists *hists)
{
        struct sort_entry *se;
        int ret = 9; /* total % */

        if (symbol_conf.show_cpu_utilization) {
                ret += 7; /* count_sys % */
                ret += 6; /* count_us % */
                if (perf_guest) {
                        ret += 13; /* count_guest_sys % */
                        ret += 12; /* count_guest_us % */
                }
        }

        if (symbol_conf.show_nr_samples)
                ret += 11;

        if (symbol_conf.show_total_period)
                ret += 13;

        list_for_each_entry(se, &hist_entry__sort_list, list)
                if (!se->elide)
                        ret += 2 + hists__col_len(hists, se->se_width_idx);

        if (verbose) /* Addr + origin */
                ret += 3 + BITS_PER_LONG / 4;

        return ret;
}

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;

        ++hists->nr_entries;
        if (h->ms.unfolded)
                hists->nr_entries += h->nr_rows;
        h->row_offset = 0;
        hists->stats.total_period += h->period;
        hists->stats.nr_events[PERF_RECORD_SAMPLE] += h->nr_events;

        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;
}

void hists__filter_by_dso(struct hists *hists)
{
        struct rb_node *nd;

        hists->nr_entries = hists->stats.total_period = 0;
        hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
        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 (symbol_conf.exclude_other && !h->parent)
                        continue;

                if (hists__filter_entry_by_dso(hists, h))
                        continue;

                hists__remove_entry_filter(hists, h, HIST_FILTER__DSO);
        }
}

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;
}

void hists__filter_by_thread(struct hists *hists)
{
        struct rb_node *nd;

        hists->nr_entries = hists->stats.total_period = 0;
        hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
        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 (hists__filter_entry_by_thread(hists, h))
                        continue;

                hists__remove_entry_filter(hists, h, HIST_FILTER__THREAD);
        }
}

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;
}

void hists__filter_by_symbol(struct hists *hists)
{
        struct rb_node *nd;

        hists->nr_entries = hists->stats.total_period = 0;
        hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
        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 (hists__filter_entry_by_symbol(hists, h))
                        continue;

                hists__remove_entry_filter(hists, h, HIST_FILTER__SYMBOL);
        }
}

int hist_entry__inc_addr_samples(struct hist_entry *he, int evidx, u64 ip)
{
        return symbol__inc_addr_samples(he->ms.sym, he->ms.map, evidx, ip);
}

int hist_entry__annotate(struct hist_entry *he, size_t privsize)
{
        return symbol__annotate(he->ms.sym, he->ms.map, privsize);
}

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

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

        for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
                const char *name;

                if (hists->stats.nr_events[i] == 0)
                        continue;

                name = perf_event__name(i);
                if (!strcmp(name, "UNKNOWN"))
                        continue;

                ret += fprintf(fp, "%16s events: %10d\n", name,
                               hists->stats.nr_events[i]);
        }

        return ret;
}