pref_counter: tools: report: Add header printout & prettify

[mirror_ubuntu-bionic-kernel.git] / Documentation / perf_counter / builtin-report.c

#include "util/util.h"
#include "builtin.h"

#include <libelf.h>
#include <gelf.h>
#include <elf.h>

#include "util/list.h"
#include "util/cache.h"
#include "util/rbtree.h"

#include "perf.h"

#include "util/parse-options.h"
#include "util/parse-events.h"

#define SHOW_KERNEL     1
#define SHOW_USER       2
#define SHOW_HV         4

static char             const *input_name = "perf.data";
static char             *vmlinux = NULL;
static char             *sort_order = "pid,symbol";
static int              input;
static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;

static int              dump_trace = 0;
static int              verbose;

static unsigned long    page_size;
static unsigned long    mmap_window = 32;

const char *perf_event_names[] = {
        [PERF_EVENT_MMAP]   = " PERF_EVENT_MMAP",
        [PERF_EVENT_MUNMAP] = " PERF_EVENT_MUNMAP",
        [PERF_EVENT_COMM]   = " PERF_EVENT_COMM",
};

struct ip_event {
        struct perf_event_header header;
        __u64 ip;
        __u32 pid, tid;
};
struct mmap_event {
        struct perf_event_header header;
        __u32 pid, tid;
        __u64 start;
        __u64 len;
        __u64 pgoff;
        char filename[PATH_MAX];
};
struct comm_event {
        struct perf_event_header header;
        __u32 pid,tid;
        char comm[16];
};

typedef union event_union {
        struct perf_event_header header;
        struct ip_event ip;
        struct mmap_event mmap;
        struct comm_event comm;
} event_t;

struct symbol {
        struct rb_node          rb_node;
        __u64                   start;
        __u64                   end;
        char                    name[0];
};

static struct symbol *symbol__new(uint64_t start, uint64_t len, const char *name)
{
        struct symbol *self = malloc(sizeof(*self) + strlen(name) + 1);

        if (self != NULL) {
                self->start = start;
                self->end   = start + len;
                strcpy(self->name, name);
        }

        return self;
}

static void symbol__delete(struct symbol *self)
{
        free(self);
}

static size_t symbol__fprintf(struct symbol *self, FILE *fp)
{
        return fprintf(fp, " %llx-%llx %s\n",
                       self->start, self->end, self->name);
}

struct dso {
        struct list_head node;
        struct rb_root   syms;
        char             name[0];
};

static struct dso *dso__new(const char *name)
{
        struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);

        if (self != NULL) {
                strcpy(self->name, name);
                self->syms = RB_ROOT;
        }

        return self;
}

static void dso__delete_symbols(struct dso *self)
{
        struct symbol *pos;
        struct rb_node *next = rb_first(&self->syms);

        while (next) {
                pos = rb_entry(next, struct symbol, rb_node);
                next = rb_next(&pos->rb_node);
                symbol__delete(pos);
        }
}

static void dso__delete(struct dso *self)
{
        dso__delete_symbols(self);
        free(self);
}

static void dso__insert_symbol(struct dso *self, struct symbol *sym)
{
        struct rb_node **p = &self->syms.rb_node;
        struct rb_node *parent = NULL;
        const uint64_t ip = sym->start;
        struct symbol *s;

        while (*p != NULL) {
                parent = *p;
                s = rb_entry(parent, struct symbol, rb_node);
                if (ip < s->start)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }
        rb_link_node(&sym->rb_node, parent, p);
        rb_insert_color(&sym->rb_node, &self->syms);
}

static struct symbol *dso__find_symbol(struct dso *self, uint64_t ip)
{
        struct rb_node *n;

        if (self == NULL)
                return NULL;

        n = self->syms.rb_node;

        while (n) {
                struct symbol *s = rb_entry(n, struct symbol, rb_node);

                if (ip < s->start)
                        n = n->rb_left;
                else if (ip > s->end)
                        n = n->rb_right;
                else
                        return s;
        }

        return NULL;
}

/**
 * elf_symtab__for_each_symbol - iterate thru all the symbols
 *
 * @self: struct elf_symtab instance to iterate
 * @index: uint32_t index
 * @sym: GElf_Sym iterator
 */
#define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
        for (index = 0, gelf_getsym(syms, index, &sym);\
             index < nr_syms; \
             index++, gelf_getsym(syms, index, &sym))

static inline uint8_t elf_sym__type(const GElf_Sym *sym)
{
        return GELF_ST_TYPE(sym->st_info);
}

static inline int elf_sym__is_function(const GElf_Sym *sym)
{
        return elf_sym__type(sym) == STT_FUNC &&
               sym->st_name != 0 &&
               sym->st_shndx != SHN_UNDEF &&
               sym->st_size != 0;
}

static inline const char *elf_sym__name(const GElf_Sym *sym,
                                        const Elf_Data *symstrs)
{
        return symstrs->d_buf + sym->st_name;
}

static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
                                    GElf_Shdr *shp, const char *name,
                                    size_t *index)
{
        Elf_Scn *sec = NULL;
        size_t cnt = 1;

        while ((sec = elf_nextscn(elf, sec)) != NULL) {
                char *str;

                gelf_getshdr(sec, shp);
                str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
                if (!strcmp(name, str)) {
                        if (index)
                                *index = cnt;
                        break;
                }
                ++cnt;
        }

        return sec;
}

static int dso__load_sym(struct dso *self, int fd, char *name)
{
        Elf_Data *symstrs;
        uint32_t nr_syms;
        int err = -1;
        uint32_t index;
        GElf_Ehdr ehdr;
        GElf_Shdr shdr;
        Elf_Data *syms;
        GElf_Sym sym;
        Elf_Scn *sec;
        Elf *elf;
        int nr = 0;

        elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
        if (elf == NULL) {
                fprintf(stderr, "%s: cannot read %s ELF file.\n",
                        __func__, name);
                goto out_close;
        }

        if (gelf_getehdr(elf, &ehdr) == NULL) {
                fprintf(stderr, "%s: cannot get elf header.\n", __func__);
                goto out_elf_end;
        }

        sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
        if (sec == NULL)
                sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);

        if (sec == NULL)
                goto out_elf_end;

        syms = elf_getdata(sec, NULL);
        if (syms == NULL)
                goto out_elf_end;

        sec = elf_getscn(elf, shdr.sh_link);
        if (sec == NULL)
                goto out_elf_end;

        symstrs = elf_getdata(sec, NULL);
        if (symstrs == NULL)
                goto out_elf_end;

        nr_syms = shdr.sh_size / shdr.sh_entsize;

        elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
                struct symbol *f;

                if (!elf_sym__is_function(&sym))
                        continue;

                sec = elf_getscn(elf, sym.st_shndx);
                if (!sec)
                        goto out_elf_end;

                gelf_getshdr(sec, &shdr);
                sym.st_value -= shdr.sh_addr - shdr.sh_offset;

                f = symbol__new(sym.st_value, sym.st_size,
                                elf_sym__name(&sym, symstrs));
                if (!f)
                        goto out_elf_end;

                dso__insert_symbol(self, f);

                nr++;
        }

        err = nr;
out_elf_end:
        elf_end(elf);
out_close:
        return err;
}

static int dso__load(struct dso *self)
{
        int size = strlen(self->name) + sizeof("/usr/lib/debug%s.debug");
        char *name = malloc(size);
        int variant = 0;
        int ret = -1;
        int fd;

        if (!name)
                return -1;

more:
        do {
                switch (variant) {
                case 0: /* Fedora */
                        snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
                        break;
                case 1: /* Ubuntu */
                        snprintf(name, size, "/usr/lib/debug%s", self->name);
                        break;
                case 2: /* Sane people */
                        snprintf(name, size, "%s", self->name);
                        break;

                default:
                        goto out;
                }
                variant++;

                fd = open(name, O_RDONLY);
        } while (fd < 0);

        ret = dso__load_sym(self, fd, name);
        close(fd);

        /*
         * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
         */
        if (!ret)
                goto more;

out:
        free(name);
        return ret;
}

static size_t dso__fprintf(struct dso *self, FILE *fp)
{
        size_t ret = fprintf(fp, "dso: %s\n", self->name);

        struct rb_node *nd;
        for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
                struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
                ret += symbol__fprintf(pos, fp);
        }

        return ret;
}

static LIST_HEAD(dsos);
static struct dso *kernel_dso;

static void dsos__add(struct dso *dso)
{
        list_add_tail(&dso->node, &dsos);
}

static struct dso *dsos__find(const char *name)
{
        struct dso *pos;

        list_for_each_entry(pos, &dsos, node)
                if (strcmp(pos->name, name) == 0)
                        return pos;
        return NULL;
}

static struct dso *dsos__findnew(const char *name)
{
        struct dso *dso = dsos__find(name);
        int nr;

        if (dso == NULL) {
                dso = dso__new(name);
                if (!dso)
                        goto out_delete_dso;

                nr = dso__load(dso);
                if (nr < 0) {
                        fprintf(stderr, "Failed to open: %s\n", name);
                        goto out_delete_dso;
                }
                if (!nr) {
                        fprintf(stderr,
                "Failed to find debug symbols for: %s, maybe install a debug package?\n",
                                        name);
                }

                dsos__add(dso);
        }

        return dso;

out_delete_dso:
        dso__delete(dso);
        return NULL;
}

static void dsos__fprintf(FILE *fp)
{
        struct dso *pos;

        list_for_each_entry(pos, &dsos, node)
                dso__fprintf(pos, fp);
}

static int hex(char ch)
{
        if ((ch >= '0') && (ch <= '9'))
                return ch - '0';
        if ((ch >= 'a') && (ch <= 'f'))
                return ch - 'a' + 10;
        if ((ch >= 'A') && (ch <= 'F'))
                return ch - 'A' + 10;
        return -1;
}

/*
 * While we find nice hex chars, build a long_val.
 * Return number of chars processed.
 */
static int hex2long(char *ptr, unsigned long *long_val)
{
        const char *p = ptr;
        *long_val = 0;

        while (*p) {
                const int hex_val = hex(*p);

                if (hex_val < 0)
                        break;

                *long_val = (*long_val << 4) | hex_val;
                p++;
        }

        return p - ptr;
}

static int load_kallsyms(void)
{
        struct rb_node *nd, *prevnd;
        char *line = NULL;
        FILE *file;
        size_t n;

        kernel_dso = dso__new("[kernel]");
        if (kernel_dso == NULL)
                return -1;

        file = fopen("/proc/kallsyms", "r");
        if (file == NULL)
                goto out_delete_dso;

        while (!feof(file)) {
                unsigned long start;
                struct symbol *sym;
                int line_len, len;
                char symbol_type;

                line_len = getline(&line, &n, file);
                if (line_len < 0)
                        break;

                if (!line)
                        goto out_delete_dso;

                line[--line_len] = '\0'; /* \n */

                len = hex2long(line, &start);

                len++;
                if (len + 2 >= line_len)
                        continue;

                symbol_type = toupper(line[len]);
                /*
                 * We're interested only in code ('T'ext)
                 */
                if (symbol_type != 'T' && symbol_type != 'W')
                        continue;
                /*
                 * Well fix up the end later, when we have all sorted.
                 */
                sym = symbol__new(start, 0xdead, line + len + 2);

                if (sym == NULL)
                        goto out_delete_dso;

                dso__insert_symbol(kernel_dso, sym);
        }

        /*
         * Now that we have all sorted out, just set the ->end of all
         * symbols
         */
        prevnd = rb_first(&kernel_dso->syms);

        if (prevnd == NULL)
                goto out_delete_line;

        for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
                struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
                              *curr = rb_entry(nd, struct symbol, rb_node);

                prev->end = curr->start - 1;
                prevnd = nd;
        }

        dsos__add(kernel_dso);
        free(line);
        fclose(file);

        return 0;

out_delete_line:
        free(line);
out_delete_dso:
        dso__delete(kernel_dso);
        return -1;
}

static int load_kernel(void)
{
        int fd, nr;

        if (!vmlinux)
                goto kallsyms;

        fd = open(vmlinux, O_RDONLY);
        if (fd < 0)
                goto kallsyms;

        kernel_dso = dso__new("[kernel]");
        if (!kernel_dso)
                goto fail_open;

        nr = dso__load_sym(kernel_dso, fd, vmlinux);

        if (nr <= 0)
                goto fail_load;

        dsos__add(kernel_dso);
        close(fd);

        return 0;

fail_load:
        dso__delete(kernel_dso);
fail_open:
        close(fd);
kallsyms:
        return load_kallsyms();
}

struct map {
        struct list_head node;
        uint64_t         start;
        uint64_t         end;
        uint64_t         pgoff;
        struct dso       *dso;
};

static struct map *map__new(struct mmap_event *event)
{
        struct map *self = malloc(sizeof(*self));

        if (self != NULL) {
                self->start = event->start;
                self->end   = event->start + event->len;
                self->pgoff = event->pgoff;

                self->dso = dsos__findnew(event->filename);
                if (self->dso == NULL)
                        goto out_delete;
        }
        return self;
out_delete:
        free(self);
        return NULL;
}

struct thread;

static const char *thread__name(struct thread *self, char *bf, size_t size);

struct thread {
        struct rb_node   rb_node;
        struct list_head maps;
        pid_t            pid;
        char             *comm;
};

static const char *thread__name(struct thread *self, char *bf, size_t size)
{
        if (self->comm)
                return self->comm;

        snprintf(bf, sizeof(bf), ":%u", self->pid);
        return bf;
}

static struct thread *thread__new(pid_t pid)
{
        struct thread *self = malloc(sizeof(*self));

        if (self != NULL) {
                self->pid = pid;
                self->comm = NULL;
                INIT_LIST_HEAD(&self->maps);
        }

        return self;
}

static int thread__set_comm(struct thread *self, const char *comm)
{
        self->comm = strdup(comm);
        return self->comm ? 0 : -ENOMEM;
}

static struct rb_root threads;

static struct thread *threads__findnew(pid_t pid)
{
        struct rb_node **p = &threads.rb_node;
        struct rb_node *parent = NULL;
        struct thread *th;

        while (*p != NULL) {
                parent = *p;
                th = rb_entry(parent, struct thread, rb_node);

                if (th->pid == pid)
                        return th;

                if (pid < th->pid)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }

        th = thread__new(pid);
        if (th != NULL) {
                rb_link_node(&th->rb_node, parent, p);
                rb_insert_color(&th->rb_node, &threads);
        }
        return th;
}

static void thread__insert_map(struct thread *self, struct map *map)
{
        list_add_tail(&map->node, &self->maps);
}

static struct map *thread__find_map(struct thread *self, uint64_t ip)
{
        struct map *pos;

        if (self == NULL)
                return NULL;

        list_for_each_entry(pos, &self->maps, node)
                if (ip >= pos->start && ip <= pos->end)
                        return pos;

        return NULL;
}

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

static struct rb_root hist;

struct hist_entry {
        struct rb_node   rb_node;

        struct thread    *thread;
        struct map       *map;
        struct dso       *dso;
        struct symbol    *sym;
        uint64_t         ip;
        char             level;

        uint32_t         count;
};

/*
 * configurable sorting bits
 */

struct sort_entry {
        struct list_head list;

        int64_t (*cmp)(struct hist_entry *, struct hist_entry *);
        size_t (*print_header)(FILE *fp);
        size_t  (*print)(FILE *fp, struct hist_entry *);
};

static int64_t
sort__thread_cmp(struct hist_entry *left, struct hist_entry *right)
{
        return right->thread->pid - left->thread->pid;
}

static size_t
sort__thread_print(FILE *fp, struct hist_entry *self)
{
        char bf[32];

        return fprintf(fp, " %16s",
                        thread__name(self->thread, bf, sizeof(bf)));
}

static struct sort_entry sort_thread = {
        .cmp    = sort__thread_cmp,
        .print  = sort__thread_print,
};

static int64_t
sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
{
        char *comm_l = left->thread->comm;
        char *comm_r = right->thread->comm;

        if (!comm_l || !comm_r) {
                if (!comm_l && !comm_r)
                        return 0;
                else if (!comm_l)
                        return -1;
                else
                        return 1;
        }

        return strcmp(comm_l, comm_r);
}

static size_t
sort__comm_print(FILE *fp, struct hist_entry *self)
{
        return fprintf(fp, " %16s", self->thread->comm ?: "<unknown>");
}

static struct sort_entry sort_comm = {
        .cmp    = sort__comm_cmp,
        .print  = sort__comm_print,
};

static int64_t
sort__dso_cmp(struct hist_entry *left, struct hist_entry *right)
{
        struct dso *dso_l = left->dso;
        struct dso *dso_r = right->dso;

        if (!dso_l || !dso_r) {
                if (!dso_l && !dso_r)
                        return 0;
                else if (!dso_l)
                        return -1;
                else
                        return 1;
        }

        return strcmp(dso_l->name, dso_r->name);
}

static size_t
sort__dso_print(FILE *fp, struct hist_entry *self)
{
        return fprintf(fp, " %64s", self->dso ? self->dso->name : "<unknown>");
}

static struct sort_entry sort_dso = {
        .cmp    = sort__dso_cmp,
        .print  = sort__dso_print,
};

static int64_t
sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
{
        uint64_t ip_l, ip_r;

        if (left->sym == right->sym)
                return 0;

        ip_l = left->sym ? left->sym->start : left->ip;
        ip_r = right->sym ? right->sym->start : right->ip;

        return (int64_t)(ip_r - ip_l);
}

static size_t sort__sym_print_header(FILE *fp)
{
        size_t ret = 0;

        ret += fprintf(fp, "#\n");
        ret += fprintf(fp, "# Overhead          Command       File: Symbol\n");
        ret += fprintf(fp, "# ........          .......       ............\n");
        ret += fprintf(fp, "#\n");

        return ret;
}

static size_t
sort__sym_print(FILE *fp, struct hist_entry *self)
{
        size_t ret = 0;

        ret += fprintf(fp, "  [%c] ", self->level);

        if (verbose)
                ret += fprintf(fp, " %#018llx", (unsigned long long)self->ip);

        if (self->level != '.')
                ret += fprintf(fp, " kernel: %s",
                               self->sym ? self->sym->name : "<unknown>");
        else
                ret += fprintf(fp, " %s: %s",
                               self->dso ? self->dso->name : "<unknown>",
                               self->sym ? self->sym->name : "<unknown>");

        return ret;
}

static struct sort_entry sort_sym = {
        .cmp            = sort__sym_cmp,
        .print_header   = sort__sym_print_header,
        .print          = sort__sym_print,
};

struct sort_dimension {
        char *name;
        struct sort_entry *entry;
        int taken;
};

static struct sort_dimension sort_dimensions[] = {
        { .name = "pid",        .entry = &sort_thread,  },
        { .name = "comm",       .entry = &sort_comm,    },
        { .name = "dso",        .entry = &sort_dso,     },
        { .name = "symbol",     .entry = &sort_sym,     },
};

static LIST_HEAD(hist_entry__sort_list);

static int sort_dimension__add(char *tok)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(sort_dimensions); i++) {
                struct sort_dimension *sd = &sort_dimensions[i];

                if (sd->taken)
                        continue;

                if (strcmp(tok, sd->name))
                        continue;

                list_add_tail(&sd->entry->list, &hist_entry__sort_list);
                sd->taken = 1;
                return 0;
        }

        return -ESRCH;
}

static void setup_sorting(void)
{
        char *tmp, *tok, *str = strdup(sort_order);

        for (tok = strtok_r(str, ", ", &tmp);
                        tok; tok = strtok_r(NULL, ", ", &tmp))
                sort_dimension__add(tok);

        free(str);
}

static 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->cmp(left, right);
                if (cmp)
                        break;
        }

        return cmp;
}

static size_t
hist_entry__fprintf(FILE *fp, struct hist_entry *self, uint64_t total_samples)
{
        struct sort_entry *se;
        size_t ret;

        if (total_samples) {
                ret = fprintf(fp, "    %5.2f%%",
                                (self->count * 100.0) / total_samples);
        } else
                ret = fprintf(fp, "%12d ", self->count);

        list_for_each_entry(se, &hist_entry__sort_list, list)
                ret += se->print(fp, self);

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

        return ret;
}

/*
 * collect histogram counts
 */

static int
hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
                struct symbol *sym, uint64_t ip, char level)
{
        struct rb_node **p = &hist.rb_node;
        struct rb_node *parent = NULL;
        struct hist_entry *he;
        struct hist_entry entry = {
                .thread = thread,
                .map    = map,
                .dso    = dso,
                .sym    = sym,
                .ip     = ip,
                .level  = level,
                .count  = 1,
        };
        int cmp;

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

                cmp = hist_entry__cmp(&entry, he);

                if (!cmp) {
                        he->count++;
                        return 0;
                }

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

        he = malloc(sizeof(*he));
        if (!he)
                return -ENOMEM;
        *he = entry;
        rb_link_node(&he->rb_node, parent, p);
        rb_insert_color(&he->rb_node, &hist);

        return 0;
}

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

static struct rb_root output_hists;

static void output__insert_entry(struct hist_entry *he)
{
        struct rb_node **p = &output_hists.rb_node;
        struct rb_node *parent = NULL;
        struct hist_entry *iter;

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

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

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

static void output__resort(void)
{
        struct rb_node *next = rb_first(&hist);
        struct hist_entry *n;

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

                rb_erase(&n->rb_node, &hist);
                output__insert_entry(n);
        }
}

static size_t output__fprintf(FILE *fp, uint64_t total_samples)
{
        struct hist_entry *pos;
        struct sort_entry *se;
        struct rb_node *nd;
        size_t ret = 0;

        list_for_each_entry(se, &hist_entry__sort_list, list) {
                if (se->print_header)
                        ret += se->print_header(fp);
        }

        for (nd = rb_first(&output_hists); nd; nd = rb_next(nd)) {
                pos = rb_entry(nd, struct hist_entry, rb_node);
                ret += hist_entry__fprintf(fp, pos, total_samples);
        }

        return ret;
}


static int __cmd_report(void)
{
        unsigned long offset = 0;
        unsigned long head = 0;
        struct stat stat;
        char *buf;
        event_t *event;
        int ret, rc = EXIT_FAILURE;
        uint32_t size;
        unsigned long total = 0, total_mmap = 0, total_comm = 0, total_unknown = 0;

        input = open(input_name, O_RDONLY);
        if (input < 0) {
                perror("failed to open file");
                exit(-1);
        }

        ret = fstat(input, &stat);
        if (ret < 0) {
                perror("failed to stat file");
                exit(-1);
        }

        if (!stat.st_size) {
                fprintf(stderr, "zero-sized file, nothing to do!\n");
                exit(0);
        }

        if (load_kernel() < 0) {
                perror("failed to open kallsyms");
                return EXIT_FAILURE;
        }

remap:
        buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
                           MAP_SHARED, input, offset);
        if (buf == MAP_FAILED) {
                perror("failed to mmap file");
                exit(-1);
        }

more:
        event = (event_t *)(buf + head);

        size = event->header.size;
        if (!size)
                size = 8;

        if (head + event->header.size >= page_size * mmap_window) {
                unsigned long shift = page_size * (head / page_size);
                int ret;

                ret = munmap(buf, page_size * mmap_window);
                assert(ret == 0);

                offset += shift;
                head -= shift;
                goto remap;
        }

        size = event->header.size;
        if (!size)
                goto broken_event;

        if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
                char level;
                int show = 0;
                struct dso *dso = NULL;
                struct thread *thread = threads__findnew(event->ip.pid);
                uint64_t ip = event->ip.ip;
                struct map *map = NULL;

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT (IP, %d): %d: %p\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                event->header.misc,
                                event->ip.pid,
                                (void *)(long)ip);
                }

                if (thread == NULL) {
                        fprintf(stderr, "problem processing %d event, bailing out\n",
                                event->header.type);
                        goto done;
                }

                if (event->header.misc & PERF_EVENT_MISC_KERNEL) {
                        show = SHOW_KERNEL;
                        level = 'k';

                        dso = kernel_dso;

                } else if (event->header.misc & PERF_EVENT_MISC_USER) {

                        show = SHOW_USER;
                        level = '.';

                        map = thread__find_map(thread, ip);
                        if (map != NULL) {
                                dso = map->dso;
                                ip -= map->start + map->pgoff;
                        }

                } else {
                        show = SHOW_HV;
                        level = 'H';
                }

                if (show & show_mask) {
                        struct symbol *sym = dso__find_symbol(dso, ip);

                        if (hist_entry__add(thread, map, dso, sym, ip, level)) {
                                fprintf(stderr,
                "problem incrementing symbol count, bailing out\n");
                                goto done;
                        }
                }
                total++;
        } else switch (event->header.type) {
        case PERF_EVENT_MMAP: {
                struct thread *thread = threads__findnew(event->mmap.pid);
                struct map *map = map__new(&event->mmap);

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT_MMAP: [%p(%p) @ %p]: %s\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                (void *)(long)event->mmap.start,
                                (void *)(long)event->mmap.len,
                                (void *)(long)event->mmap.pgoff,
                                event->mmap.filename);
                }
                if (thread == NULL || map == NULL) {
                        fprintf(stderr, "problem processing PERF_EVENT_MMAP, bailing out\n");
                        goto done;
                }
                thread__insert_map(thread, map);
                total_mmap++;
                break;
        }
        case PERF_EVENT_COMM: {
                struct thread *thread = threads__findnew(event->comm.pid);

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT_COMM: %s:%d\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                event->comm.comm, event->comm.pid);
                }
                if (thread == NULL ||
                    thread__set_comm(thread, event->comm.comm)) {
                        fprintf(stderr, "problem processing PERF_EVENT_COMM, bailing out\n");
                        goto done;
                }
                total_comm++;
                break;
        }
        default: {
broken_event:
                if (dump_trace)
                        fprintf(stderr, "%p [%p]: skipping unknown header type: %d\n",
                                        (void *)(offset + head),
                                        (void *)(long)(event->header.size),
                                        event->header.type);

                total_unknown++;

                /*
                 * assume we lost track of the stream, check alignment, and
                 * increment a single u64 in the hope to catch on again 'soon'.
                 */

                if (unlikely(head & 7))
                        head &= ~7ULL;

                size = 8;
        }
        }

        head += size;

        if (offset + head < stat.st_size)
                goto more;

        rc = EXIT_SUCCESS;
done:
        close(input);

        if (dump_trace) {
                fprintf(stderr, "      IP events: %10ld\n", total);
                fprintf(stderr, "    mmap events: %10ld\n", total_mmap);
                fprintf(stderr, "    comm events: %10ld\n", total_comm);
                fprintf(stderr, " unknown events: %10ld\n", total_unknown);

                return 0;
        }

        if (verbose >= 2)
                dsos__fprintf(stdout);

        output__resort();
        output__fprintf(stdout, total);

        return rc;
}

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

static const struct option options[] = {
        OPT_STRING('i', "input", &input_name, "file",
                    "input file name"),
        OPT_BOOLEAN('v', "verbose", &verbose,
                    "be more verbose (show symbol address, etc)"),
        OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
                    "dump raw trace in ASCII"),
        OPT_STRING('k', "vmlinux", &vmlinux, "file", "vmlinux pathname"),
        OPT_STRING('s', "sort", &sort_order, "foo", "bar"),
        OPT_END()
};

int cmd_report(int argc, const char **argv, const char *prefix)
{
        elf_version(EV_CURRENT);

        page_size = getpagesize();

        parse_options(argc, argv, options, report_usage, 0);

        setup_sorting();

        setup_pager();

        return __cmd_report();
}