linux/tools/perf/builtin-annotate.c
Ian Munsie eac23d1c38 perf record,report,annotate,diff: Process events in order
This patch changes perf report to ask for the ID info on all events be
default if recording from multiple CPUs.

Perf report, annotate and diff will now process the events in order if
the kernel is able to provide timestamps on all events. This ensures
that events such as COMM and MMAP which are necessary to correctly
interpret samples are processed prior to those samples so that they are
attributed correctly.

Before:
 # perf record ./cachetest
 # perf report

 # Events: 6K cycles
 #
 # Overhead  Command      Shared Object                           Symbol
 # ........  .......  .................  ...............................
 #
     74.11%    :3259  [unknown]          [k] 0x4a6c
      1.50%  cachetest  ld-2.11.2.so       [.] 0x1777c
      1.46%    :3259  [kernel.kallsyms]  [k] .perf_event_mmap_ctx
      1.25%    :3259  [kernel.kallsyms]  [k] restore
      0.74%    :3259  [kernel.kallsyms]  [k] ._raw_spin_lock
      0.71%    :3259  [kernel.kallsyms]  [k] .filemap_fault
      0.66%    :3259  [kernel.kallsyms]  [k] .memset
      0.54%  cachetest  [kernel.kallsyms]  [k] .sha_transform
      0.54%    :3259  [kernel.kallsyms]  [k] .copy_4K_page
      0.54%    :3259  [kernel.kallsyms]  [k] .find_get_page
      0.52%    :3259  [kernel.kallsyms]  [k] .trace_hardirqs_off
      0.50%    :3259  [kernel.kallsyms]  [k] .__do_fault
<SNIP>

After:
 # perf report

 # Events: 6K cycles
 #
 # Overhead  Command      Shared Object                           Symbol
 # ........  .......  .................  ...............................
 #
     44.28%  cachetest  cachetest          [.] sumArrayNaive
     22.53%  cachetest  cachetest          [.] sumArrayOptimal
      6.59%  cachetest  ld-2.11.2.so       [.] 0x1777c
      2.13%  cachetest  [unknown]          [k] 0x340
      1.46%  cachetest  [kernel.kallsyms]  [k] .perf_event_mmap_ctx
      1.25%  cachetest  [kernel.kallsyms]  [k] restore
      0.74%  cachetest  [kernel.kallsyms]  [k] ._raw_spin_lock
      0.71%  cachetest  [kernel.kallsyms]  [k] .filemap_fault
      0.66%  cachetest  [kernel.kallsyms]  [k] .memset
      0.54%  cachetest  [kernel.kallsyms]  [k] .copy_4K_page
      0.54%  cachetest  [kernel.kallsyms]  [k] .find_get_page
      0.54%  cachetest  [kernel.kallsyms]  [k] .sha_transform
      0.52%  cachetest  [kernel.kallsyms]  [k] .trace_hardirqs_off
      0.50%  cachetest  [kernel.kallsyms]  [k] .__do_fault
<SNIP>

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1291872833-839-1-git-send-email-imunsie@au1.ibm.com>
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2010-12-21 20:17:51 -02:00

482 lines
11 KiB
C

/*
* builtin-annotate.c
*
* Builtin annotate command: Analyze the perf.data input file,
* look up and read DSOs and symbol information and display
* a histogram of results, along various sorting keys.
*/
#include "builtin.h"
#include "util/util.h"
#include "util/color.h"
#include <linux/list.h>
#include "util/cache.h"
#include <linux/rbtree.h>
#include "util/symbol.h"
#include "perf.h"
#include "util/debug.h"
#include "util/event.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
#include "util/thread.h"
#include "util/sort.h"
#include "util/hist.h"
#include "util/session.h"
static char const *input_name = "perf.data";
static bool force, use_tui, use_stdio;
static bool full_paths;
static bool print_line;
static const char *sym_hist_filter;
static int hists__add_entry(struct hists *self, struct addr_location *al)
{
struct hist_entry *he;
if (sym_hist_filter != NULL &&
(al->sym == NULL || strcmp(sym_hist_filter, al->sym->name) != 0)) {
/* We're only interested in a symbol named sym_hist_filter */
if (al->sym != NULL) {
rb_erase(&al->sym->rb_node,
&al->map->dso->symbols[al->map->type]);
symbol__delete(al->sym);
}
return 0;
}
he = __hists__add_entry(self, al, NULL, 1);
if (he == NULL)
return -ENOMEM;
return hist_entry__inc_addr_samples(he, al->addr);
}
static int process_sample_event(event_t *event, struct sample_data *sample,
struct perf_session *session)
{
struct addr_location al;
if (event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
pr_warning("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
if (!al.filtered && hists__add_entry(&session->hists, &al)) {
pr_warning("problem incrementing symbol count, "
"skipping event\n");
return -1;
}
return 0;
}
static int objdump_line__print(struct objdump_line *self,
struct list_head *head,
struct hist_entry *he, u64 len)
{
struct symbol *sym = he->ms.sym;
static const char *prev_line;
static const char *prev_color;
if (self->offset != -1) {
const char *path = NULL;
unsigned int hits = 0;
double percent = 0.0;
const char *color;
struct sym_priv *priv = symbol__priv(sym);
struct sym_ext *sym_ext = priv->ext;
struct sym_hist *h = priv->hist;
s64 offset = self->offset;
struct objdump_line *next = objdump__get_next_ip_line(head, self);
while (offset < (s64)len &&
(next == NULL || offset < next->offset)) {
if (sym_ext) {
if (path == NULL)
path = sym_ext[offset].path;
percent += sym_ext[offset].percent;
} else
hits += h->ip[offset];
++offset;
}
if (sym_ext == NULL && h->sum)
percent = 100.0 * hits / h->sum;
color = get_percent_color(percent);
/*
* Also color the filename and line if needed, with
* the same color than the percentage. Don't print it
* twice for close colored ip with the same filename:line
*/
if (path) {
if (!prev_line || strcmp(prev_line, path)
|| color != prev_color) {
color_fprintf(stdout, color, " %s", path);
prev_line = path;
prev_color = color;
}
}
color_fprintf(stdout, color, " %7.2f", percent);
printf(" : ");
color_fprintf(stdout, PERF_COLOR_BLUE, "%s\n", self->line);
} else {
if (!*self->line)
printf(" :\n");
else
printf(" : %s\n", self->line);
}
return 0;
}
static struct rb_root root_sym_ext;
static void insert_source_line(struct sym_ext *sym_ext)
{
struct sym_ext *iter;
struct rb_node **p = &root_sym_ext.rb_node;
struct rb_node *parent = NULL;
while (*p != NULL) {
parent = *p;
iter = rb_entry(parent, struct sym_ext, node);
if (sym_ext->percent > iter->percent)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&sym_ext->node, parent, p);
rb_insert_color(&sym_ext->node, &root_sym_ext);
}
static void free_source_line(struct hist_entry *he, int len)
{
struct sym_priv *priv = symbol__priv(he->ms.sym);
struct sym_ext *sym_ext = priv->ext;
int i;
if (!sym_ext)
return;
for (i = 0; i < len; i++)
free(sym_ext[i].path);
free(sym_ext);
priv->ext = NULL;
root_sym_ext = RB_ROOT;
}
/* Get the filename:line for the colored entries */
static void
get_source_line(struct hist_entry *he, int len, const char *filename)
{
struct symbol *sym = he->ms.sym;
u64 start;
int i;
char cmd[PATH_MAX * 2];
struct sym_ext *sym_ext;
struct sym_priv *priv = symbol__priv(sym);
struct sym_hist *h = priv->hist;
if (!h->sum)
return;
sym_ext = priv->ext = calloc(len, sizeof(struct sym_ext));
if (!priv->ext)
return;
start = he->ms.map->unmap_ip(he->ms.map, sym->start);
for (i = 0; i < len; i++) {
char *path = NULL;
size_t line_len;
u64 offset;
FILE *fp;
sym_ext[i].percent = 100.0 * h->ip[i] / h->sum;
if (sym_ext[i].percent <= 0.5)
continue;
offset = start + i;
sprintf(cmd, "addr2line -e %s %016llx", filename, offset);
fp = popen(cmd, "r");
if (!fp)
continue;
if (getline(&path, &line_len, fp) < 0 || !line_len)
goto next;
sym_ext[i].path = malloc(sizeof(char) * line_len + 1);
if (!sym_ext[i].path)
goto next;
strcpy(sym_ext[i].path, path);
insert_source_line(&sym_ext[i]);
next:
pclose(fp);
}
}
static void print_summary(const char *filename)
{
struct sym_ext *sym_ext;
struct rb_node *node;
printf("\nSorted summary for file %s\n", filename);
printf("----------------------------------------------\n\n");
if (RB_EMPTY_ROOT(&root_sym_ext)) {
printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
return;
}
node = rb_first(&root_sym_ext);
while (node) {
double percent;
const char *color;
char *path;
sym_ext = rb_entry(node, struct sym_ext, node);
percent = sym_ext->percent;
color = get_percent_color(percent);
path = sym_ext->path;
color_fprintf(stdout, color, " %7.2f %s", percent, path);
node = rb_next(node);
}
}
static void hist_entry__print_hits(struct hist_entry *self)
{
struct symbol *sym = self->ms.sym;
struct sym_priv *priv = symbol__priv(sym);
struct sym_hist *h = priv->hist;
u64 len = sym->end - sym->start, offset;
for (offset = 0; offset < len; ++offset)
if (h->ip[offset] != 0)
printf("%*Lx: %Lu\n", BITS_PER_LONG / 2,
sym->start + offset, h->ip[offset]);
printf("%*s: %Lu\n", BITS_PER_LONG / 2, "h->sum", h->sum);
}
static int hist_entry__tty_annotate(struct hist_entry *he)
{
struct map *map = he->ms.map;
struct dso *dso = map->dso;
struct symbol *sym = he->ms.sym;
const char *filename = dso->long_name, *d_filename;
u64 len;
LIST_HEAD(head);
struct objdump_line *pos, *n;
if (hist_entry__annotate(he, &head, 0) < 0)
return -1;
if (full_paths)
d_filename = filename;
else
d_filename = basename(filename);
len = sym->end - sym->start;
if (print_line) {
get_source_line(he, len, filename);
print_summary(filename);
}
printf("\n\n------------------------------------------------\n");
printf(" Percent | Source code & Disassembly of %s\n", d_filename);
printf("------------------------------------------------\n");
if (verbose)
hist_entry__print_hits(he);
list_for_each_entry_safe(pos, n, &head, node) {
objdump_line__print(pos, &head, he, len);
list_del(&pos->node);
objdump_line__free(pos);
}
if (print_line)
free_source_line(he, len);
return 0;
}
static void hists__find_annotations(struct hists *self)
{
struct rb_node *nd = rb_first(&self->entries), *next;
int key = KEY_RIGHT;
while (nd) {
struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
struct sym_priv *priv;
if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
goto find_next;
priv = symbol__priv(he->ms.sym);
if (priv->hist == NULL) {
find_next:
if (key == KEY_LEFT)
nd = rb_prev(nd);
else
nd = rb_next(nd);
continue;
}
if (use_browser > 0) {
key = hist_entry__tui_annotate(he);
switch (key) {
case KEY_RIGHT:
next = rb_next(nd);
break;
case KEY_LEFT:
next = rb_prev(nd);
break;
default:
return;
}
if (next != NULL)
nd = next;
} else {
hist_entry__tty_annotate(he);
nd = rb_next(nd);
/*
* Since we have a hist_entry per IP for the same
* symbol, free he->ms.sym->hist to signal we already
* processed this symbol.
*/
free(priv->hist);
priv->hist = NULL;
}
}
}
static struct perf_event_ops event_ops = {
.sample = process_sample_event,
.mmap = event__process_mmap,
.comm = event__process_comm,
.fork = event__process_task,
.ordered_samples = true,
.ordering_requires_timestamps = true,
};
static int __cmd_annotate(void)
{
int ret;
struct perf_session *session;
session = perf_session__new(input_name, O_RDONLY, force, false, &event_ops);
if (session == NULL)
return -ENOMEM;
ret = perf_session__process_events(session, &event_ops);
if (ret)
goto out_delete;
if (dump_trace) {
perf_session__fprintf_nr_events(session, stdout);
goto out_delete;
}
if (verbose > 3)
perf_session__fprintf(session, stdout);
if (verbose > 2)
perf_session__fprintf_dsos(session, stdout);
hists__collapse_resort(&session->hists);
hists__output_resort(&session->hists);
hists__find_annotations(&session->hists);
out_delete:
perf_session__delete(session);
return ret;
}
static const char * const annotate_usage[] = {
"perf annotate [<options>] <command>",
NULL
};
static const struct option options[] = {
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
"only consider symbols in these dsos"),
OPT_STRING('s', "symbol", &sym_hist_filter, "symbol",
"symbol to annotate"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_BOOLEAN('l', "print-line", &print_line,
"print matching source lines (may be slow)"),
OPT_BOOLEAN('P', "full-paths", &full_paths,
"Don't shorten the displayed pathnames"),
OPT_END()
};
int cmd_annotate(int argc, const char **argv, const char *prefix __used)
{
argc = parse_options(argc, argv, options, annotate_usage, 0);
if (use_stdio)
use_browser = 0;
else if (use_tui)
use_browser = 1;
setup_browser();
symbol_conf.priv_size = sizeof(struct sym_priv);
symbol_conf.try_vmlinux_path = true;
if (symbol__init() < 0)
return -1;
setup_sorting(annotate_usage, options);
if (argc) {
/*
* Special case: if there's an argument left then assume tha
* it's a symbol filter:
*/
if (argc > 1)
usage_with_options(annotate_usage, options);
sym_hist_filter = argv[0];
}
if (field_sep && *field_sep == '.') {
pr_err("'.' is the only non valid --field-separator argument\n");
return -1;
}
return __cmd_annotate();
}