![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Simplifying the tools that were using both in sequence and allowing upcoming simplifications, such as Arun's patch to sort by cpus. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
230 lines
6.1 KiB
C
230 lines
6.1 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 bool force;
|
|
static bool show_displacement;
|
|
|
|
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(event_t *event, struct perf_session *session)
|
|
{
|
|
struct addr_location al;
|
|
struct sample_data data = { .period = 1, };
|
|
|
|
if (event__preprocess_sample(event, session, &al, &data, NULL) < 0) {
|
|
pr_warning("problem processing %d event, skipping it.\n",
|
|
event->header.type);
|
|
return -1;
|
|
}
|
|
|
|
if (al.filtered || al.sym == NULL)
|
|
return 0;
|
|
|
|
if (hists__add_entry(&session->hists, &al, data.period)) {
|
|
pr_warning("problem incrementing symbol period, skipping event\n");
|
|
return -1;
|
|
}
|
|
|
|
session->hists.stats.total_period += 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 hists__resort_entries(struct hists *self)
|
|
{
|
|
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);
|
|
rb_erase(&n->rb_node, &self->entries);
|
|
n->position = position++;
|
|
perf_session__insert_hist_entry_by_name(&tmp, n);
|
|
}
|
|
|
|
self->entries = tmp;
|
|
}
|
|
|
|
static void hists__set_positions(struct hists *self)
|
|
{
|
|
hists__output_resort(self);
|
|
hists__resort_entries(self);
|
|
}
|
|
|
|
static struct hist_entry *hists__find_entry(struct hists *self,
|
|
struct hist_entry *he)
|
|
{
|
|
struct rb_node *n = self->entries.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 hists__match(struct hists *older, struct hists *newer)
|
|
{
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
|
|
struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
|
|
pos->pair = hists__find_entry(older, pos);
|
|
}
|
|
}
|
|
|
|
static int __cmd_diff(void)
|
|
{
|
|
int ret, i;
|
|
struct perf_session *session[2];
|
|
|
|
session[0] = perf_session__new(input_old, O_RDONLY, force, false);
|
|
session[1] = perf_session__new(input_new, O_RDONLY, force, false);
|
|
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;
|
|
}
|
|
|
|
hists__output_resort(&session[1]->hists);
|
|
if (show_displacement)
|
|
hists__set_positions(&session[0]->hists);
|
|
|
|
hists__match(&session[0]->hists, &session[1]->hists);
|
|
hists__fprintf(&session[1]->hists, &session[0]->hists,
|
|
show_displacement, stdout);
|
|
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_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('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];
|
|
} 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;
|
|
|
|
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();
|
|
}
|