linux/tools/perf/builtin-diff.c
Eric B Munson eefc465cdd perf session: Change perf_session post processing functions to take histogram tree
Now that report can store historgrams for multiple events we
need to be able to do the post processing work for each
histogram. This patch changes the post processing functions so
that they can be called individually for each event's histogram.

Signed-off-by: Eric B Munson <ebmunson@us.ibm.com>
[ Guarantee bisectabilty by fixing up builtin-report.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1267804269-22660-5-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-03-10 13:53:49 +01:00

242 lines
6.5 KiB
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/session.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 int force;
static bool show_displacement;
static int perf_session__add_hist_entry(struct perf_session *self,
struct addr_location *al, u64 count)
{
bool hit;
struct hist_entry *he = __perf_session__add_hist_entry(&self->hists,
al, NULL,
count, &hit);
if (he == NULL)
return -ENOMEM;
if (hit)
he->count += count;
return 0;
}
static int diff__process_sample_event(event_t *event, struct perf_session *session)
{
struct addr_location al;
struct sample_data data = { .period = 1, };
dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc,
event->ip.pid, event->ip.ip);
if (event__preprocess_sample(event, session, &al, NULL) < 0) {
pr_warning("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
if (al.filtered || al.sym == NULL)
return 0;
event__parse_sample(event, session->sample_type, &data);
if (perf_session__add_hist_entry(session, &al, data.period)) {
pr_warning("problem incrementing symbol count, skipping event\n");
return -1;
}
session->events_stats.total += data.period;
return 0;
}
static struct perf_event_ops event_ops = {
.sample = diff__process_sample_event,
.mmap = event__process_mmap,
.comm = event__process_comm,
.exit = event__process_task,
.fork = event__process_task,
.lost = event__process_lost,
};
static void perf_session__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 perf_session__resort_hist_entries(struct perf_session *self)
{
unsigned long position = 1;
struct rb_root tmp = RB_ROOT;
struct rb_node *next = rb_first(&self->hists);
while (next != NULL) {
struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&n->rb_node);
rb_erase(&n->rb_node, &self->hists);
n->position = position++;
perf_session__insert_hist_entry_by_name(&tmp, n);
}
self->hists = tmp;
}
static void perf_session__set_hist_entries_positions(struct perf_session *self)
{
perf_session__output_resort(&self->hists, self->events_stats.total);
perf_session__resort_hist_entries(self);
}
static struct hist_entry *
perf_session__find_hist_entry(struct perf_session *self,
struct hist_entry *he)
{
struct rb_node *n = self->hists.rb_node;
while (n) {
struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
int64_t cmp = hist_entry__cmp(he, iter);
if (cmp < 0)
n = n->rb_left;
else if (cmp > 0)
n = n->rb_right;
else
return iter;
}
return NULL;
}
static void perf_session__match_hists(struct perf_session *old_session,
struct perf_session *new_session)
{
struct rb_node *nd;
for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
pos->pair = perf_session__find_hist_entry(old_session, pos);
}
}
static int __cmd_diff(void)
{
int ret, i;
struct perf_session *session[2];
session[0] = perf_session__new(input_old, O_RDONLY, force);
session[1] = perf_session__new(input_new, O_RDONLY, force);
if (session[0] == NULL || session[1] == NULL)
return -ENOMEM;
for (i = 0; i < 2; ++i) {
ret = perf_session__process_events(session[i], &event_ops);
if (ret)
goto out_delete;
}
perf_session__output_resort(&session[1]->hists,
session[1]->events_stats.total);
if (show_displacement)
perf_session__set_hist_entries_positions(session[0]);
perf_session__match_hists(session[0], session[1]);
perf_session__fprintf_hists(&session[1]->hists, session[0],
show_displacement, stdout,
session[1]->events_stats.total);
out_delete:
for (i = 0; i < 2; ++i)
perf_session__delete(session[i]);
return ret;
}
static const char * const diff_usage[] = {
"perf diff [<options>] [old_file] [new_file]",
NULL,
};
static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('m', "displacement", &show_displacement,
"Show position displacement relative to baseline"),
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_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
"Don't shorten the pathnames taking into account the cwd"),
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_END()
};
int cmd_diff(int argc, const char **argv, const char *prefix __used)
{
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];
}
symbol_conf.exclude_other = false;
if (symbol__init() < 0)
return -1;
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();
}