swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
Tip revision: 836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 authored by Linus Torvalds on 08 February 2013, 21:20:39 UTC
Linux 3.8-rc7
Linux 3.8-rc7
Tip revision: 836dc9e
builtin-diff.c
/*
* builtin-diff.c
*
* Builtin diff command: Analyze two perf.data input files, look up and read
* DSOs and symbol information, sort them and produce a diff.
*/
#include "builtin.h"
#include "util/debug.h"
#include "util/event.h"
#include "util/hist.h"
#include "util/evsel.h"
#include "util/evlist.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/sort.h"
#include "util/symbol.h"
#include "util/util.h"
#include <stdlib.h>
static char const *input_old = "perf.data.old",
*input_new = "perf.data";
static char diff__default_sort_order[] = "dso,symbol";
static bool force;
static bool show_displacement;
static bool show_period;
static bool show_formula;
static bool show_baseline_only;
static bool sort_compute;
static s64 compute_wdiff_w1;
static s64 compute_wdiff_w2;
enum {
COMPUTE_DELTA,
COMPUTE_RATIO,
COMPUTE_WEIGHTED_DIFF,
COMPUTE_MAX,
};
const char *compute_names[COMPUTE_MAX] = {
[COMPUTE_DELTA] = "delta",
[COMPUTE_RATIO] = "ratio",
[COMPUTE_WEIGHTED_DIFF] = "wdiff",
};
static int compute;
static int setup_compute_opt_wdiff(char *opt)
{
char *w1_str = opt;
char *w2_str;
int ret = -EINVAL;
if (!opt)
goto out;
w2_str = strchr(opt, ',');
if (!w2_str)
goto out;
*w2_str++ = 0x0;
if (!*w2_str)
goto out;
compute_wdiff_w1 = strtol(w1_str, NULL, 10);
compute_wdiff_w2 = strtol(w2_str, NULL, 10);
if (!compute_wdiff_w1 || !compute_wdiff_w2)
goto out;
pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
compute_wdiff_w1, compute_wdiff_w2);
ret = 0;
out:
if (ret)
pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
return ret;
}
static int setup_compute_opt(char *opt)
{
if (compute == COMPUTE_WEIGHTED_DIFF)
return setup_compute_opt_wdiff(opt);
if (opt) {
pr_err("Failed: extra option specified '%s'", opt);
return -EINVAL;
}
return 0;
}
static int setup_compute(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int *cp = (int *) opt->value;
char *cstr = (char *) str;
char buf[50];
unsigned i;
char *option;
if (!str) {
*cp = COMPUTE_DELTA;
return 0;
}
if (*str == '+') {
sort_compute = true;
cstr = (char *) ++str;
if (!*str)
return 0;
}
option = strchr(str, ':');
if (option) {
unsigned len = option++ - str;
/*
* The str data are not writeable, so we need
* to use another buffer.
*/
/* No option value is longer. */
if (len >= sizeof(buf))
return -EINVAL;
strncpy(buf, str, len);
buf[len] = 0x0;
cstr = buf;
}
for (i = 0; i < COMPUTE_MAX; i++)
if (!strcmp(cstr, compute_names[i])) {
*cp = i;
return setup_compute_opt(option);
}
pr_err("Failed: '%s' is not computation method "
"(use 'delta','ratio' or 'wdiff')\n", str);
return -EINVAL;
}
static double get_period_percent(struct hist_entry *he, u64 period)
{
u64 total = he->hists->stats.total_period;
return (period * 100.0) / total;
}
double perf_diff__compute_delta(struct hist_entry *he)
{
struct hist_entry *pair = hist_entry__next_pair(he);
double new_percent = get_period_percent(he, he->stat.period);
double old_percent = pair ? get_period_percent(pair, pair->stat.period) : 0.0;
he->diff.period_ratio_delta = new_percent - old_percent;
he->diff.computed = true;
return he->diff.period_ratio_delta;
}
double perf_diff__compute_ratio(struct hist_entry *he)
{
struct hist_entry *pair = hist_entry__next_pair(he);
double new_period = he->stat.period;
double old_period = pair ? pair->stat.period : 0;
he->diff.computed = true;
he->diff.period_ratio = pair ? (new_period / old_period) : 0;
return he->diff.period_ratio;
}
s64 perf_diff__compute_wdiff(struct hist_entry *he)
{
struct hist_entry *pair = hist_entry__next_pair(he);
u64 new_period = he->stat.period;
u64 old_period = pair ? pair->stat.period : 0;
he->diff.computed = true;
if (!pair)
he->diff.wdiff = 0;
else
he->diff.wdiff = new_period * compute_wdiff_w2 -
old_period * compute_wdiff_w1;
return he->diff.wdiff;
}
static int formula_delta(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = hist_entry__next_pair(he);
if (!pair)
return -1;
return scnprintf(buf, size,
"(%" PRIu64 " * 100 / %" PRIu64 ") - "
"(%" PRIu64 " * 100 / %" PRIu64 ")",
he->stat.period, he->hists->stats.total_period,
pair->stat.period, pair->hists->stats.total_period);
}
static int formula_ratio(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = hist_entry__next_pair(he);
double new_period = he->stat.period;
double old_period = pair ? pair->stat.period : 0;
if (!pair)
return -1;
return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
}
static int formula_wdiff(struct hist_entry *he, char *buf, size_t size)
{
struct hist_entry *pair = hist_entry__next_pair(he);
u64 new_period = he->stat.period;
u64 old_period = pair ? pair->stat.period : 0;
if (!pair)
return -1;
return scnprintf(buf, size,
"(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
}
int perf_diff__formula(char *buf, size_t size, struct hist_entry *he)
{
switch (compute) {
case COMPUTE_DELTA:
return formula_delta(he, buf, size);
case COMPUTE_RATIO:
return formula_ratio(he, buf, size);
case COMPUTE_WEIGHTED_DIFF:
return formula_wdiff(he, buf, size);
default:
BUG_ON(1);
}
return -1;
}
static int hists__add_entry(struct hists *self,
struct addr_location *al, u64 period)
{
if (__hists__add_entry(self, al, NULL, period) != NULL)
return 0;
return -ENOMEM;
}
static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine)
{
struct addr_location al;
if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
pr_warning("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
if (al.filtered)
return 0;
if (hists__add_entry(&evsel->hists, &al, sample->period)) {
pr_warning("problem incrementing symbol period, skipping event\n");
return -1;
}
evsel->hists.stats.total_period += sample->period;
return 0;
}
static struct perf_tool tool = {
.sample = diff__process_sample_event,
.mmap = perf_event__process_mmap,
.comm = perf_event__process_comm,
.exit = perf_event__process_exit,
.fork = perf_event__process_fork,
.lost = perf_event__process_lost,
.ordered_samples = true,
.ordering_requires_timestamps = true,
};
static void insert_hist_entry_by_name(struct rb_root *root,
struct hist_entry *he)
{
struct rb_node **p = &root->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 (hist_entry__cmp(he, iter) < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, root);
}
static void hists__name_resort(struct hists *self, bool sort)
{
unsigned long position = 1;
struct rb_root tmp = RB_ROOT;
struct rb_node *next = rb_first(&self->entries);
while (next != NULL) {
struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&n->rb_node);
n->position = position++;
if (sort) {
rb_erase(&n->rb_node, &self->entries);
insert_hist_entry_by_name(&tmp, n);
}
}
if (sort)
self->entries = tmp;
}
static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
struct perf_evlist *evlist)
{
struct perf_evsel *e;
list_for_each_entry(e, &evlist->entries, node)
if (perf_evsel__match2(evsel, e))
return e;
return NULL;
}
static void perf_evlist__resort_hists(struct perf_evlist *evlist, bool name)
{
struct perf_evsel *evsel;
list_for_each_entry(evsel, &evlist->entries, node) {
struct hists *hists = &evsel->hists;
hists__output_resort(hists);
/*
* The hists__name_resort only sets possition
* if name is false.
*/
if (name || ((!name) && show_displacement))
hists__name_resort(hists, name);
}
}
static void hists__baseline_only(struct hists *hists)
{
struct rb_node *next = rb_first(&hists->entries);
while (next != NULL) {
struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&he->rb_node);
if (!hist_entry__next_pair(he)) {
rb_erase(&he->rb_node, &hists->entries);
hist_entry__free(he);
}
}
}
static void hists__precompute(struct hists *hists)
{
struct rb_node *next = rb_first(&hists->entries);
while (next != NULL) {
struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&he->rb_node);
switch (compute) {
case COMPUTE_DELTA:
perf_diff__compute_delta(he);
break;
case COMPUTE_RATIO:
perf_diff__compute_ratio(he);
break;
case COMPUTE_WEIGHTED_DIFF:
perf_diff__compute_wdiff(he);
break;
default:
BUG_ON(1);
}
}
}
static int64_t cmp_doubles(double l, double r)
{
if (l > r)
return -1;
else if (l < r)
return 1;
else
return 0;
}
static int64_t
hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
int c)
{
switch (c) {
case COMPUTE_DELTA:
{
double l = left->diff.period_ratio_delta;
double r = right->diff.period_ratio_delta;
return cmp_doubles(l, r);
}
case COMPUTE_RATIO:
{
double l = left->diff.period_ratio;
double r = right->diff.period_ratio;
return cmp_doubles(l, r);
}
case COMPUTE_WEIGHTED_DIFF:
{
s64 l = left->diff.wdiff;
s64 r = right->diff.wdiff;
return r - l;
}
default:
BUG_ON(1);
}
return 0;
}
static void insert_hist_entry_by_compute(struct rb_root *root,
struct hist_entry *he,
int c)
{
struct rb_node **p = &root->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 (hist_entry__cmp_compute(he, iter, c) < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, root);
}
static void hists__compute_resort(struct hists *hists)
{
struct rb_root tmp = RB_ROOT;
struct rb_node *next = rb_first(&hists->entries);
while (next != NULL) {
struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&he->rb_node);
rb_erase(&he->rb_node, &hists->entries);
insert_hist_entry_by_compute(&tmp, he, compute);
}
hists->entries = tmp;
}
static void hists__process(struct hists *old, struct hists *new)
{
hists__match(new, old);
if (show_baseline_only)
hists__baseline_only(new);
else
hists__link(new, old);
if (sort_compute) {
hists__precompute(new);
hists__compute_resort(new);
}
hists__fprintf(new, true, 0, 0, stdout);
}
static int __cmd_diff(void)
{
int ret, i;
#define older (session[0])
#define newer (session[1])
struct perf_session *session[2];
struct perf_evlist *evlist_new, *evlist_old;
struct perf_evsel *evsel;
bool first = true;
older = perf_session__new(input_old, O_RDONLY, force, false,
&tool);
newer = perf_session__new(input_new, O_RDONLY, force, false,
&tool);
if (session[0] == NULL || session[1] == NULL)
return -ENOMEM;
for (i = 0; i < 2; ++i) {
ret = perf_session__process_events(session[i], &tool);
if (ret)
goto out_delete;
}
evlist_old = older->evlist;
evlist_new = newer->evlist;
perf_evlist__resort_hists(evlist_old, true);
perf_evlist__resort_hists(evlist_new, false);
list_for_each_entry(evsel, &evlist_new->entries, node) {
struct perf_evsel *evsel_old;
evsel_old = evsel_match(evsel, evlist_old);
if (!evsel_old)
continue;
fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
perf_evsel__name(evsel));
first = false;
hists__process(&evsel_old->hists, &evsel->hists);
}
out_delete:
for (i = 0; i < 2; ++i)
perf_session__delete(session[i]);
return ret;
#undef older
#undef newer
}
static const char * const diff_usage[] = {
"perf diff [<options>] [old_file] [new_file]",
NULL,
};
static const struct option options[] = {
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('M', "displacement", &show_displacement,
"Show position displacement relative to baseline"),
OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
"Show only items with match in baseline"),
OPT_CALLBACK('c', "compute", &compute,
"delta,ratio,wdiff:w1,w2 (default delta)",
"Entries differential computation selection",
setup_compute),
OPT_BOOLEAN('p', "period", &show_period,
"Show period values."),
OPT_BOOLEAN('F', "formula", &show_formula,
"Show formula."),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
"only consider symbols in these dsos"),
OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
"only consider symbols in these comms"),
OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
"only consider these symbols"),
OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
"sort by key(s): pid, comm, dso, symbol, parent"),
OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
"separator for columns, no spaces will be added between "
"columns '.' is reserved."),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_END()
};
static void ui_init(void)
{
perf_hpp__init();
/* No overhead column. */
perf_hpp__column_enable(PERF_HPP__OVERHEAD, false);
/*
* Display baseline/delta/ratio/displacement/
* formula/periods columns.
*/
perf_hpp__column_enable(PERF_HPP__BASELINE, true);
switch (compute) {
case COMPUTE_DELTA:
perf_hpp__column_enable(PERF_HPP__DELTA, true);
break;
case COMPUTE_RATIO:
perf_hpp__column_enable(PERF_HPP__RATIO, true);
break;
case COMPUTE_WEIGHTED_DIFF:
perf_hpp__column_enable(PERF_HPP__WEIGHTED_DIFF, true);
break;
default:
BUG_ON(1);
};
if (show_displacement)
perf_hpp__column_enable(PERF_HPP__DISPL, true);
if (show_formula)
perf_hpp__column_enable(PERF_HPP__FORMULA, true);
if (show_period) {
perf_hpp__column_enable(PERF_HPP__PERIOD, true);
perf_hpp__column_enable(PERF_HPP__PERIOD_BASELINE, true);
}
}
int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
{
sort_order = diff__default_sort_order;
argc = parse_options(argc, argv, options, diff_usage, 0);
if (argc) {
if (argc > 2)
usage_with_options(diff_usage, options);
if (argc == 2) {
input_old = argv[0];
input_new = argv[1];
} else
input_new = argv[0];
} else if (symbol_conf.default_guest_vmlinux_name ||
symbol_conf.default_guest_kallsyms) {
input_old = "perf.data.host";
input_new = "perf.data.guest";
}
symbol_conf.exclude_other = false;
if (symbol__init() < 0)
return -1;
ui_init();
setup_sorting(diff_usage, options);
setup_pager();
sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
return __cmd_diff();
}