perf_counter: First part of 'perf report' conversion to C + elfutils

Integrate perf-report into 'perf', as builtin-report.c.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 751 insertions, 0 deletions

diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
new file mode 100644
index 000000000000..864f68f06a9e
--- /dev/null
+++ b/Documentation/perf_counter/builtin-report.c
@@ -0,0 +1,751 @@
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <time.h>
+#include <getopt.h>
+#include <assert.h>
+#include <search.h>
+
+#include <sys/ioctl.h>
+#include <sys/poll.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <linux/unistd.h>
+#include <linux/types.h>
+
+#include "../../include/linux/perf_counter.h"
+#include "list.h"
+
+#define SHOW_KERNEL     1
+#define SHOW_USER       2
+#define SHOW_HV         4
+
+static char             const *input_name = "output.perf";
+static int              input;
+static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
+
+static unsigned long    page_size;
+static unsigned long    mmap_window = 32;
+
+static 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 section {
+        struct list_head node;
+        uint64_t         start;
+        uint64_t         end;
+        uint64_t         offset;
+        char             name[0];
+};
+
+static struct section *section__new(uint64_t start, uint64_t size,
+                                    uint64_t offset, char *name)
+{
+        struct section *self = malloc(sizeof(*self) + strlen(name) + 1);
+
+        if (self != NULL) {
+                self->start  = start;
+                self->end    = start + size;
+                self->offset = offset;
+                strcpy(self->name, name);
+        }
+
+        return self;
+}
+
+static void section__delete(struct section *self)
+{
+        free(self);
+}
+
+struct symbol {
+        struct list_head node;
+        uint64_t         start;
+        uint64_t         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, " %lx-%lx %s\n",
+                       self->start, self->end, self->name);
+}
+
+struct dso {
+        struct list_head node;
+        struct list_head sections;
+        struct list_head 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);
+                INIT_LIST_HEAD(&self->sections);
+                INIT_LIST_HEAD(&self->syms);
+        }
+
+        return self;
+}
+
+static void dso__delete_sections(struct dso *self)
+{
+        struct section *pos, *n;
+
+        list_for_each_entry_safe(pos, n, &self->sections, node)
+                section__delete(pos);
+}
+
+static void dso__delete_symbols(struct dso *self)
+{
+        struct symbol *pos, *n;
+
+        list_for_each_entry_safe(pos, n, &self->syms, node)
+                symbol__delete(pos);
+}
+
+static void dso__delete(struct dso *self)
+{
+        dso__delete_sections(self);
+        dso__delete_symbols(self);
+        free(self);
+}
+
+static void dso__insert_symbol(struct dso *self, struct symbol *sym)
+{
+        list_add_tail(&sym->node, &self->syms);
+}
+
+static struct symbol *dso__find_symbol(struct dso *self, uint64_t ip)
+{
+        if (self == NULL)
+                return NULL;
+
+        struct symbol *pos;
+
+        list_for_each_entry(pos, &self->syms, node)
+                if (ip >= pos->start && ip <= pos->end)
+                        return pos;
+
+        return NULL;
+}
+
+static int dso__load(struct dso *self)
+{
+        /* FIXME */
+        return 0;
+}
+
+static size_t dso__fprintf(struct dso *self, FILE *fp)
+{
+        struct symbol *pos;
+        size_t ret = fprintf(fp, "dso: %s\n", self->name);
+
+        list_for_each_entry(pos, &self->syms, 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);
+
+        if (dso == NULL) {
+                dso = dso__new(name);
+                if (dso != NULL && dso__load(dso) < 0)
+                        goto out_delete_dso;
+
+                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 load_kallsyms(void)
+{
+        kernel_dso = dso__new("[kernel]");
+        if (kernel_dso == NULL)
+                return -1;
+
+        FILE *file = fopen("/proc/kallsyms", "r");
+
+        if (file == NULL)
+                goto out_delete_dso;
+
+        char *line = NULL;
+        size_t n;
+
+        while (!feof(file)) {
+                unsigned long long start;
+                char c, symbf[4096];
+
+                if (getline(&line, &n, file) < 0)
+                        break;
+
+                if (!line)
+                        goto out_delete_dso;
+
+                if (sscanf(line, "%llx %c %s", &start, &c, symbf) == 3) {
+                        struct symbol *sym = symbol__new(start, 0x1000000, symbf);
+
+                        if (sym == NULL)
+                                goto out_delete_dso;
+
+                        dso__insert_symbol(kernel_dso, sym);
+                }
+        }
+
+        dsos__add(kernel_dso);
+        free(line);
+        fclose(file);
+        return 0;
+
+out_delete_dso:
+        dso__delete(kernel_dso);
+        return -1;
+}
+
+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;
+}
+
+static size_t map__fprintf(struct map *self, FILE *fp)
+{
+        return fprintf(fp, " %lx-%lx %lx %s\n",
+                       self->start, self->end, self->pgoff, self->dso->name);
+}
+
+struct symhist {
+        struct list_head node;
+        struct dso       *dso;
+        struct symbol    *sym;
+        uint32_t         count;
+        char             level;
+};
+
+static struct symhist *symhist__new(struct symbol *sym, struct dso *dso,
+                                    char level)
+{
+        struct symhist *self = malloc(sizeof(*self));
+
+        if (self != NULL) {
+                self->sym   = sym;
+                self->dso   = dso;
+                self->level = level;
+                self->count = 0;
+        }
+
+        return self;
+}
+
+static void symhist__delete(struct symhist *self)
+{
+        free(self);
+}
+
+static bool symhist__equal(struct symhist *self, struct symbol *sym,
+                           struct dso *dso, char level)
+{
+        return self->level == level && self->sym == sym && self->dso == dso;
+}
+
+static void symhist__inc(struct symhist *self)
+{
+        ++self->count;
+}
+
+static size_t symhist__fprintf(struct symhist *self, FILE *fp)
+{
+        size_t ret = fprintf(fp, "[%c] ", self->level);
+
+        if (self->level != '.')
+                ret += fprintf(fp, "%s", self->sym->name);
+        else
+                ret += fprintf(fp, "%s: %s",
+                               self->dso ? self->dso->name : "<unknown",
+                               self->sym ? self->sym->name : "<unknown>");
+        return ret + fprintf(fp, ": %u\n", self->count);
+}
+
+struct thread {
+        struct list_head node;
+        struct list_head maps;
+        struct list_head symhists;
+        pid_t            pid;
+        char             *comm;
+};
+
+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);
+                INIT_LIST_HEAD(&self->symhists);
+        }
+
+        return self;
+}
+
+static void thread__insert_symhist(struct thread *self,
+                                   struct symhist *symhist)
+{
+        list_add_tail(&symhist->node, &self->symhists);
+}
+
+static struct symhist *thread__symhists_find(struct thread *self,
+                                             struct symbol *sym,
+                                             struct dso *dso, char level)
+{
+        struct symhist *pos;
+
+        list_for_each_entry(pos, &self->symhists, node)
+                if (symhist__equal(pos, sym, dso, level))
+                        return pos;
+
+        return NULL;
+}
+
+static int thread__symbol_incnew(struct thread *self, struct symbol *sym,
+                                 struct dso *dso, char level)
+{
+        struct symhist *symhist = thread__symhists_find(self, sym, dso, level);
+
+        if (symhist == NULL) {
+                symhist = symhist__new(sym, dso, level);
+                if (symhist == NULL)
+                        goto out_error;
+                thread__insert_symhist(self, symhist);
+        }
+
+        symhist__inc(symhist);
+        return 0;
+out_error:
+        return -ENOMEM;
+}
+
+static int thread__set_comm(struct thread *self, const char *comm)
+{
+        self->comm = strdup(comm);
+        return self->comm ? 0 : -ENOMEM;
+}
+
+static size_t thread__maps_fprintf(struct thread *self, FILE *fp)
+{
+        struct map *pos;
+        size_t ret = 0;
+
+        list_for_each_entry(pos, &self->maps, node)
+                ret += map__fprintf(pos, fp);
+
+        return ret;
+}
+
+static size_t thread__fprintf(struct thread *self, FILE *fp)
+{
+        struct symhist *pos;
+        int ret = fprintf(fp, "thread: %d %s\n", self->pid, self->comm);
+
+        list_for_each_entry(pos, &self->symhists, node)
+                ret += symhist__fprintf(pos, fp);
+
+        return ret;
+}
+
+static LIST_HEAD(threads);
+
+static void threads__add(struct thread *thread)
+{
+        list_add_tail(&thread->node, &threads);
+}
+
+static struct thread *threads__find(pid_t pid)
+{
+        struct thread *pos;
+
+        list_for_each_entry(pos, &threads, node)
+                if (pos->pid == pid)
+                        return pos;
+        return NULL;
+}
+
+static struct thread *threads__findnew(pid_t pid)
+{
+        struct thread *thread = threads__find(pid);
+
+        if (thread == NULL) {
+                thread = thread__new(pid);
+                if (thread != NULL)
+                        threads__add(thread);
+        }
+
+        return thread;
+}
+
+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)
+{
+        if (self == NULL)
+                return NULL;
+
+        struct map *pos;
+
+        list_for_each_entry(pos, &self->maps, node)
+                if (ip >= pos->start && ip <= pos->end)
+                        return pos;
+
+        return NULL;
+}
+
+static void threads__fprintf(FILE *fp)
+{
+        struct thread *pos;
+
+        list_for_each_entry(pos, &threads, node)
+                thread__fprintf(pos, fp);
+}
+
+#if 0
+static std::string resolve_user_symbol(int pid, uint64_t ip)
+{
+        std::string sym = "<unknown>";
+
+        maps_t &m = maps[pid];
+        maps_t::const_iterator mi = m.upper_bound(map(ip));
+        if (mi == m.end())
+                return sym;
+
+        ip -= mi->start + mi->pgoff;
+
+        symbols_t &s = dsos[mi->dso].syms;
+        symbols_t::const_iterator si = s.upper_bound(symbol(ip));
+
+        sym = mi->dso + ": <unknown>";
+
+        if (si == s.begin())
+                return sym;
+        si--;
+
+        if (si->start <= ip && ip < si->end)
+                sym = mi->dso + ": " + si->name;
+#if 0
+        else if (si->start <= ip)
+                sym = mi->dso + ": ?" + si->name;
+#endif
+
+        return sym;
+}
+#endif
+
+static void display_help(void)
+{
+        printf(
+        "Usage: perf-report [<options>]\n"
+        " -i file   --input=<file>      # input file\n"
+        );
+
+        exit(0);
+}
+
+static void process_options(int argc, char *argv[])
+{
+        int error = 0;
+
+        for (;;) {
+                int option_index = 0;
+                /** Options for getopt */
+                static struct option long_options[] = {
+                        {"input",       required_argument,      NULL, 'i'},
+                        {"no-user",     no_argument,            NULL, 'u'},
+                        {"no-kernel",   no_argument,            NULL, 'k'},
+                        {"no-hv",       no_argument,            NULL, 'h'},
+                        {NULL,          0,                      NULL,  0 }
+                };
+                int c = getopt_long(argc, argv, "+:i:kuh",
+                                    long_options, &option_index);
+                if (c == -1)
+                        break;
+
+                switch (c) {
+                case 'i': input_name                    = strdup(optarg); break;
+                case 'k': show_mask &= ~SHOW_KERNEL; break;
+                case 'u': show_mask &= ~SHOW_USER; break;
+                case 'h': show_mask &= ~SHOW_HV; break;
+                default: error = 1; break;
+                }
+        }
+
+        if (error)
+                display_help();
+}
+
+int cmd_report(int argc, char **argv)
+{
+        unsigned long offset = 0;
+        unsigned long head = 0;
+        struct stat stat;
+        char *buf;
+        event_t *event;
+        int ret, rc = EXIT_FAILURE;
+        unsigned long total = 0;
+
+        page_size = getpagesize();
+
+        process_options(argc, argv);
+
+        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_kallsyms() < 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);
+
+        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;
+        }
+
+
+        if (!event->header.size) {
+                fprintf(stderr, "zero-sized event at file offset %ld\n", offset + head);
+                fprintf(stderr, "skipping %ld bytes of events.\n", stat.st_size - offset - head);
+                goto done;
+        }
+
+        head += event->header.size;
+
+        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);
+
+                if (thread == NULL)
+                        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 = '.';
+                        struct map *map = thread__find_map(thread, event->ip.ip);
+                        if (map != NULL)
+                                dso = map->dso;
+                } else {
+                        show = SHOW_HV;
+                        level = 'H';
+                }
+
+                if (show & show_mask) {
+                        struct symbol *sym = dso__find_symbol(dso, event->ip.ip);
+
+                        if (thread__symbol_incnew(thread, sym, dso, level))
+                                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 (thread == NULL || map == NULL )
+                        goto done;
+                thread__insert_map(thread, map);
+                break;
+        }
+        case PERF_EVENT_COMM: {
+                struct thread *thread = threads__findnew(event->comm.pid);
+
+                if (thread == NULL ||
+                    thread__set_comm(thread, event->comm.comm))
+                        goto done;
+                break;
+        }
+        }
+
+        if (offset + head < stat.st_size)
+                goto more;
+
+        rc = EXIT_SUCCESS;
+done:
+        close(input);
+        //dsos__fprintf(stdout);
+        threads__fprintf(stdout);
+#if 0
+        std::map<std::string, int>::iterator hi = hist.begin();
+
+        while (hi != hist.end()) {
+                rev_hist.insert(std::pair<int, std::string>(hi->second, hi->first));
+                hist.erase(hi++);
+        }
+
+        std::multimap<int, std::string>::const_iterator ri = rev_hist.begin();
+
+        while (ri != rev_hist.end()) {
+                printf(" %5.2f %s\n", (100.0 * ri->first)/total, ri->second.c_str());
+                ri++;
+        }
+#endif
+        return rc;
+}
+