![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Since they can come from another architecture with bigger pointers, i.e. processing a 64-bit perf.data on a 32-bit arch. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1263478990-8200-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
552 lines
12 KiB
C
552 lines
12 KiB
C
/*
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* builtin-annotate.c
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*
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* Builtin annotate command: Analyze the perf.data input file,
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* look up and read DSOs and symbol information and display
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* a histogram of results, along various sorting keys.
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*/
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#include "builtin.h"
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#include "util/util.h"
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#include "util/color.h"
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#include <linux/list.h>
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#include "util/cache.h"
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#include <linux/rbtree.h>
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#include "util/symbol.h"
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#include "util/string.h"
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#include "perf.h"
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#include "util/debug.h"
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#include "util/event.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include "util/thread.h"
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#include "util/sort.h"
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#include "util/hist.h"
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#include "util/session.h"
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static char const *input_name = "perf.data";
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static int force;
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static int full_paths;
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static int print_line;
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struct sym_hist {
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u64 sum;
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u64 ip[0];
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};
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struct sym_ext {
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struct rb_node node;
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double percent;
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char *path;
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};
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struct sym_priv {
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struct sym_hist *hist;
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struct sym_ext *ext;
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};
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static const char *sym_hist_filter;
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static int symbol_filter(struct map *map __used, struct symbol *sym)
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{
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if (sym_hist_filter == NULL ||
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strcmp(sym->name, sym_hist_filter) == 0) {
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struct sym_priv *priv = symbol__priv(sym);
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const int size = (sizeof(*priv->hist) +
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(sym->end - sym->start) * sizeof(u64));
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priv->hist = malloc(size);
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if (priv->hist)
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memset(priv->hist, 0, size);
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return 0;
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}
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/*
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* FIXME: We should really filter it out, as we don't want to go thru symbols
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* we're not interested, and if a DSO ends up with no symbols, delete it too,
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* but right now the kernel loading routines in symbol.c bail out if no symbols
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* are found, fix it later.
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*/
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return 0;
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}
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/*
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* collect histogram counts
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*/
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static void hist_hit(struct hist_entry *he, u64 ip)
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{
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unsigned int sym_size, offset;
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struct symbol *sym = he->sym;
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struct sym_priv *priv;
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struct sym_hist *h;
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he->count++;
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if (!sym || !he->map)
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return;
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priv = symbol__priv(sym);
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if (!priv->hist)
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return;
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sym_size = sym->end - sym->start;
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offset = ip - sym->start;
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if (verbose)
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fprintf(stderr, "%s: ip=%Lx\n", __func__,
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he->map->unmap_ip(he->map, ip));
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if (offset >= sym_size)
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return;
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h = priv->hist;
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h->sum++;
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h->ip[offset]++;
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if (verbose >= 3)
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printf("%p %s: count++ [ip: %p, %08Lx] => %Ld\n",
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(void *)(unsigned long)he->sym->start,
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he->sym->name,
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(void *)(unsigned long)ip, ip - he->sym->start,
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h->ip[offset]);
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}
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static int perf_session__add_hist_entry(struct perf_session *self,
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struct addr_location *al, u64 count)
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{
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bool hit;
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struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
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count, &hit);
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if (he == NULL)
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return -ENOMEM;
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hist_hit(he, al->addr);
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return 0;
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}
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static int process_sample_event(event_t *event, struct perf_session *session)
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{
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struct addr_location al;
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dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc,
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event->ip.pid, event->ip.ip);
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if (event__preprocess_sample(event, session, &al, symbol_filter) < 0) {
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fprintf(stderr, "problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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if (!al.filtered && perf_session__add_hist_entry(session, &al, 1)) {
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fprintf(stderr, "problem incrementing symbol count, "
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"skipping event\n");
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return -1;
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}
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return 0;
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}
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static int parse_line(FILE *file, struct hist_entry *he, u64 len)
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{
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struct symbol *sym = he->sym;
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char *line = NULL, *tmp, *tmp2;
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static const char *prev_line;
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static const char *prev_color;
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unsigned int offset;
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size_t line_len;
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u64 start;
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s64 line_ip;
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int ret;
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char *c;
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if (getline(&line, &line_len, file) < 0)
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return -1;
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if (!line)
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return -1;
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c = strchr(line, '\n');
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if (c)
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*c = 0;
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line_ip = -1;
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offset = 0;
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ret = -2;
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/*
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* Strip leading spaces:
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*/
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tmp = line;
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while (*tmp) {
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if (*tmp != ' ')
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break;
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tmp++;
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}
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if (*tmp) {
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/*
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* Parse hexa addresses followed by ':'
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*/
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line_ip = strtoull(tmp, &tmp2, 16);
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if (*tmp2 != ':')
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line_ip = -1;
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}
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start = he->map->unmap_ip(he->map, sym->start);
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if (line_ip != -1) {
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const char *path = NULL;
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unsigned int hits = 0;
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double percent = 0.0;
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const char *color;
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struct sym_priv *priv = symbol__priv(sym);
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struct sym_ext *sym_ext = priv->ext;
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struct sym_hist *h = priv->hist;
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offset = line_ip - start;
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if (offset < len)
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hits = h->ip[offset];
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if (offset < len && sym_ext) {
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path = sym_ext[offset].path;
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percent = sym_ext[offset].percent;
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} else if (h->sum)
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percent = 100.0 * hits / h->sum;
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color = get_percent_color(percent);
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/*
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* Also color the filename and line if needed, with
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* the same color than the percentage. Don't print it
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* twice for close colored ip with the same filename:line
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*/
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if (path) {
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if (!prev_line || strcmp(prev_line, path)
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|| color != prev_color) {
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color_fprintf(stdout, color, " %s", path);
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prev_line = path;
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prev_color = color;
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}
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}
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color_fprintf(stdout, color, " %7.2f", percent);
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printf(" : ");
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color_fprintf(stdout, PERF_COLOR_BLUE, "%s\n", line);
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} else {
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if (!*line)
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printf(" :\n");
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else
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printf(" : %s\n", line);
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}
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return 0;
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}
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static struct rb_root root_sym_ext;
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static void insert_source_line(struct sym_ext *sym_ext)
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{
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struct sym_ext *iter;
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struct rb_node **p = &root_sym_ext.rb_node;
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struct rb_node *parent = NULL;
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while (*p != NULL) {
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parent = *p;
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iter = rb_entry(parent, struct sym_ext, node);
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if (sym_ext->percent > iter->percent)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&sym_ext->node, parent, p);
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rb_insert_color(&sym_ext->node, &root_sym_ext);
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}
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static void free_source_line(struct hist_entry *he, int len)
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{
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struct sym_priv *priv = symbol__priv(he->sym);
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struct sym_ext *sym_ext = priv->ext;
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int i;
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if (!sym_ext)
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return;
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for (i = 0; i < len; i++)
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free(sym_ext[i].path);
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free(sym_ext);
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priv->ext = NULL;
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root_sym_ext = RB_ROOT;
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}
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/* Get the filename:line for the colored entries */
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static void
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get_source_line(struct hist_entry *he, int len, const char *filename)
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{
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struct symbol *sym = he->sym;
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u64 start;
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int i;
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char cmd[PATH_MAX * 2];
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struct sym_ext *sym_ext;
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struct sym_priv *priv = symbol__priv(sym);
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struct sym_hist *h = priv->hist;
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if (!h->sum)
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return;
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sym_ext = priv->ext = calloc(len, sizeof(struct sym_ext));
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if (!priv->ext)
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return;
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start = he->map->unmap_ip(he->map, sym->start);
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for (i = 0; i < len; i++) {
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char *path = NULL;
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size_t line_len;
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u64 offset;
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FILE *fp;
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sym_ext[i].percent = 100.0 * h->ip[i] / h->sum;
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if (sym_ext[i].percent <= 0.5)
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continue;
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offset = start + i;
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sprintf(cmd, "addr2line -e %s %016llx", filename, offset);
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fp = popen(cmd, "r");
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if (!fp)
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continue;
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if (getline(&path, &line_len, fp) < 0 || !line_len)
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goto next;
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sym_ext[i].path = malloc(sizeof(char) * line_len + 1);
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if (!sym_ext[i].path)
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goto next;
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strcpy(sym_ext[i].path, path);
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insert_source_line(&sym_ext[i]);
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next:
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pclose(fp);
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}
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}
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static void print_summary(const char *filename)
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{
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struct sym_ext *sym_ext;
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struct rb_node *node;
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printf("\nSorted summary for file %s\n", filename);
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printf("----------------------------------------------\n\n");
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if (RB_EMPTY_ROOT(&root_sym_ext)) {
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printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
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return;
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}
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node = rb_first(&root_sym_ext);
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while (node) {
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double percent;
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const char *color;
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char *path;
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sym_ext = rb_entry(node, struct sym_ext, node);
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percent = sym_ext->percent;
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color = get_percent_color(percent);
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path = sym_ext->path;
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color_fprintf(stdout, color, " %7.2f %s", percent, path);
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node = rb_next(node);
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}
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}
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static void annotate_sym(struct hist_entry *he)
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{
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struct map *map = he->map;
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struct dso *dso = map->dso;
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struct symbol *sym = he->sym;
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const char *filename = dso->long_name, *d_filename;
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u64 len;
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char command[PATH_MAX*2];
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FILE *file;
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if (!filename)
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return;
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if (verbose)
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fprintf(stderr, "%s: filename=%s, sym=%s, start=%Lx, end=%Lx\n",
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__func__, filename, sym->name,
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map->unmap_ip(map, sym->start),
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map->unmap_ip(map, sym->end));
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if (full_paths)
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d_filename = filename;
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else
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d_filename = basename(filename);
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len = sym->end - sym->start;
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if (print_line) {
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get_source_line(he, len, filename);
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print_summary(filename);
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}
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printf("\n\n------------------------------------------------\n");
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printf(" Percent | Source code & Disassembly of %s\n", d_filename);
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printf("------------------------------------------------\n");
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if (verbose >= 2)
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printf("annotating [%p] %30s : [%p] %30s\n",
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dso, dso->long_name, sym, sym->name);
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sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s|grep -v %s",
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map->unmap_ip(map, sym->start), map->unmap_ip(map, sym->end),
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filename, filename);
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if (verbose >= 3)
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printf("doing: %s\n", command);
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file = popen(command, "r");
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if (!file)
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return;
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while (!feof(file)) {
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if (parse_line(file, he, len) < 0)
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break;
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}
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pclose(file);
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if (print_line)
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free_source_line(he, len);
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}
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static void perf_session__find_annotations(struct perf_session *self)
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{
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struct rb_node *nd;
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for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
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struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
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struct sym_priv *priv;
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if (he->sym == NULL)
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continue;
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priv = symbol__priv(he->sym);
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if (priv->hist == NULL)
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continue;
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annotate_sym(he);
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/*
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* Since we have a hist_entry per IP for the same symbol, free
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* he->sym->hist to signal we already processed this symbol.
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*/
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free(priv->hist);
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priv->hist = NULL;
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}
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}
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static struct perf_event_ops event_ops = {
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.sample = process_sample_event,
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.mmap = event__process_mmap,
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.comm = event__process_comm,
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.fork = event__process_task,
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};
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static int __cmd_annotate(void)
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{
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int ret;
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struct perf_session *session;
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session = perf_session__new(input_name, O_RDONLY, force);
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if (session == NULL)
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return -ENOMEM;
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ret = perf_session__process_events(session, &event_ops);
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if (ret)
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goto out_delete;
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if (dump_trace) {
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event__print_totals();
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goto out_delete;
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}
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if (verbose > 3)
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perf_session__fprintf(session, stdout);
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if (verbose > 2)
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dsos__fprintf(stdout);
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perf_session__collapse_resort(session);
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perf_session__output_resort(session, session->event_total[0]);
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perf_session__find_annotations(session);
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out_delete:
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perf_session__delete(session);
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return ret;
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}
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static const char * const annotate_usage[] = {
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"perf annotate [<options>] <command>",
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NULL
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};
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static const struct option options[] = {
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OPT_STRING('i', "input", &input_name, "file",
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"input file name"),
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OPT_STRING('s', "symbol", &sym_hist_filter, "symbol",
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"symbol to annotate"),
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OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
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"load module symbols - WARNING: use only with -k and LIVE kernel"),
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OPT_BOOLEAN('l', "print-line", &print_line,
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"print matching source lines (may be slow)"),
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OPT_BOOLEAN('P', "full-paths", &full_paths,
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"Don't shorten the displayed pathnames"),
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OPT_END()
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};
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int cmd_annotate(int argc, const char **argv, const char *prefix __used)
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{
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argc = parse_options(argc, argv, options, annotate_usage, 0);
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symbol_conf.priv_size = sizeof(struct sym_priv);
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symbol_conf.try_vmlinux_path = true;
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if (symbol__init() < 0)
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return -1;
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setup_sorting(annotate_usage, options);
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if (argc) {
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/*
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* Special case: if there's an argument left then assume tha
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* it's a symbol filter:
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*/
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if (argc > 1)
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usage_with_options(annotate_usage, options);
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sym_hist_filter = argv[0];
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}
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setup_pager();
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if (field_sep && *field_sep == '.') {
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fputs("'.' is the only non valid --field-separator argument\n",
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stderr);
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exit(129);
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}
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return __cmd_annotate();
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}
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