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perf lock: Introduce new tool "perf lock", for analyzing lock statistics

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Adding new subcommand "perf lock" to perf.

I have a lot of remaining ToDos, but for now perf lock can
already provide minimal functionality for analyzing lock
statistics.

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1264851813-8413-12-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hitoshi Mitake 2010-01-30 20:43:33 +09:00 committed by Ingo Molnar
parent c965be10ca
commit 9b5e350c7a
4 changed files with 727 additions and 0 deletions
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1
tools/perf/Makefile
View File

@ -456,6 +456,7 @@ BUILTIN_OBJS += builtin-top.o
BUILTIN_OBJS += builtin-trace.o
BUILTIN_OBJS += builtin-probe.o
BUILTIN_OBJS += builtin-kmem.o
BUILTIN_OBJS += builtin-lock.o
PERFLIBS = $(LIB_FILE)

724
tools/perf/builtin-lock.c Normal file
View File

@ -0,0 +1,724 @@
#include "builtin.h"
#include "perf.h"
#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/parse-options.h"
#include "util/trace-event.h"
#include "util/debug.h"
#include "util/session.h"
#include <sys/types.h>
#include <sys/prctl.h>
#include <semaphore.h>
#include <pthread.h>
#include <math.h>
#include <limits.h>
#include <linux/list.h>
#include <linux/hash.h>
/* based on kernel/lockdep.c */
#define LOCKHASH_BITS 12
#define LOCKHASH_SIZE (1UL << LOCKHASH_BITS)
static struct list_head lockhash_table[LOCKHASH_SIZE];
#define __lockhashfn(key) hash_long((unsigned long)key, LOCKHASH_BITS)
#define lockhashentry(key) (lockhash_table + __lockhashfn((key)))
#define LOCK_STATE_UNLOCKED 0 /* initial state */
#define LOCK_STATE_LOCKED 1
struct lock_stat {
struct list_head hash_entry;
struct rb_node rb; /* used for sorting */
/* FIXME: raw_field_value() returns unsigned long long,
* so address of lockdep_map should be dealed as 64bit.
* Is there more better solution? */
void *addr; /* address of lockdep_map, used as ID */
char *name; /* for strcpy(), we cannot use const */
char *file;
unsigned int line;
int state;
u64 prev_event_time; /* timestamp of previous event */
unsigned int nr_acquired;
unsigned int nr_acquire;
unsigned int nr_contended;
unsigned int nr_release;
/* these times are in nano sec. */
u64 wait_time_total;
u64 wait_time_min;
u64 wait_time_max;
};
/* build simple key function one is bigger than two */
#define SINGLE_KEY(member) \
static int lock_stat_key_ ## member(struct lock_stat *one, \
struct lock_stat *two) \
{ \
return one->member > two->member; \
}
SINGLE_KEY(nr_acquired)
SINGLE_KEY(nr_contended)
SINGLE_KEY(wait_time_total)
SINGLE_KEY(wait_time_min)
SINGLE_KEY(wait_time_max)
struct lock_key {
/*
* name: the value for specify by user
* this should be simpler than raw name of member
* e.g. nr_acquired -> acquired, wait_time_total -> wait_total
*/
const char *name;
int (*key)(struct lock_stat*, struct lock_stat*);
};
static const char *sort_key = "acquired";
static int (*compare)(struct lock_stat *, struct lock_stat *);
#define DEF_KEY_LOCK(name, fn_suffix) \
{ #name, lock_stat_key_ ## fn_suffix }
struct lock_key keys[] = {
DEF_KEY_LOCK(acquired, nr_acquired),
DEF_KEY_LOCK(contended, nr_contended),
DEF_KEY_LOCK(wait_total, wait_time_total),
DEF_KEY_LOCK(wait_min, wait_time_min),
DEF_KEY_LOCK(wait_max, wait_time_max),
/* extra comparisons much complicated should be here */
{ NULL, NULL }
};
static void select_key(void)
{
int i;
for (i = 0; keys[i].name; i++) {
if (!strcmp(keys[i].name, sort_key)) {
compare = keys[i].key;
return;
}
}
die("Unknown compare key:%s\n", sort_key);
}
static struct rb_root result; /* place to store sorted data */
static void insert_to_result(struct lock_stat *st,
int (*bigger)(struct lock_stat *,
struct lock_stat *))
{
struct rb_node **rb = &result.rb_node;
struct rb_node *parent = NULL;
struct lock_stat *p;
while (*rb) {
p = container_of(*rb, struct lock_stat, rb);
parent = *rb;
if (bigger(st, p))
rb = &(*rb)->rb_left;
else
rb = &(*rb)->rb_right;
}
rb_link_node(&st->rb, parent, rb);
rb_insert_color(&st->rb, &result);
}
/* returns left most element of result, and erase it */
static struct lock_stat *pop_from_result(void)
{
struct rb_node *node = result.rb_node;
if (!node)
return NULL;
while (node->rb_left)
node = node->rb_left;
rb_erase(node, &result);
return container_of(node, struct lock_stat, rb);
}
static struct lock_stat *lock_stat_findnew(void *addr, const char *name,
const char *file, unsigned int line)
{
struct list_head *entry = lockhashentry(addr);
struct lock_stat *ret, *new;
list_for_each_entry(ret, entry, hash_entry) {
if (ret->addr == addr)
return ret;
}
new = zalloc(sizeof(struct lock_stat));
if (!new)
goto alloc_failed;
new->addr = addr;
new->name = zalloc(sizeof(char) * strlen(name) + 1);
if (!new->name)
goto alloc_failed;
strcpy(new->name, name);
new->file = zalloc(sizeof(char) * strlen(file) + 1);
if (!new->file)
goto alloc_failed;
strcpy(new->file, file);
new->line = line;
/* LOCK_STATE_UNLOCKED == 0 isn't guaranteed forever */
new->state = LOCK_STATE_UNLOCKED;
new->wait_time_min = ULLONG_MAX;
list_add(&new->hash_entry, entry);
return new;
alloc_failed:
die("memory allocation failed\n");
}
static char const *input_name = "perf.data";
static int profile_cpu = -1;
struct raw_event_sample {
u32 size;
char data[0];
};
struct trace_acquire_event {
void *addr;
const char *name;
const char *file;
unsigned int line;
};
struct trace_acquired_event {
void *addr;
const char *name;
const char *file;
unsigned int line;
};
struct trace_contended_event {
void *addr;
const char *name;
const char *file;
unsigned int line;
};
struct trace_release_event {
void *addr;
const char *name;
const char *file;
unsigned int line;
};
struct trace_lock_handler {
void (*acquire_event)(struct trace_acquire_event *,
struct event *,
int cpu,
u64 timestamp,
struct thread *thread);
void (*acquired_event)(struct trace_acquired_event *,
struct event *,
int cpu,
u64 timestamp,
struct thread *thread);
void (*contended_event)(struct trace_contended_event *,
struct event *,
int cpu,
u64 timestamp,
struct thread *thread);
void (*release_event)(struct trace_release_event *,
struct event *,
int cpu,
u64 timestamp,
struct thread *thread);
};
static void prof_lock_acquire_event(struct trace_acquire_event *acquire_event,
struct event *__event __used,
int cpu __used,
u64 timestamp,
struct thread *thread __used)
{
struct lock_stat *st;
st = lock_stat_findnew(acquire_event->addr, acquire_event->name,
acquire_event->file, acquire_event->line);
switch (st->state) {
case LOCK_STATE_UNLOCKED:
break;
case LOCK_STATE_LOCKED:
break;
default:
BUG_ON(1);
break;
}
st->prev_event_time = timestamp;
}
static void prof_lock_acquired_event(struct trace_acquired_event *acquired_event,
struct event *__event __used,
int cpu __used,
u64 timestamp,
struct thread *thread __used)
{
struct lock_stat *st;
st = lock_stat_findnew(acquired_event->addr, acquired_event->name,
acquired_event->file, acquired_event->line);
switch (st->state) {
case LOCK_STATE_UNLOCKED:
st->state = LOCK_STATE_LOCKED;
st->nr_acquired++;
break;
case LOCK_STATE_LOCKED:
break;
default:
BUG_ON(1);
break;
}
st->prev_event_time = timestamp;
}
static void prof_lock_contended_event(struct trace_contended_event *contended_event,
struct event *__event __used,
int cpu __used,
u64 timestamp,
struct thread *thread __used)
{
struct lock_stat *st;
st = lock_stat_findnew(contended_event->addr, contended_event->name,
contended_event->file, contended_event->line);
switch (st->state) {
case LOCK_STATE_UNLOCKED:
break;
case LOCK_STATE_LOCKED:
st->nr_contended++;
break;
default:
BUG_ON(1);
break;
}
st->prev_event_time = timestamp;
}
static void prof_lock_release_event(struct trace_release_event *release_event,
struct event *__event __used,
int cpu __used,
u64 timestamp,
struct thread *thread __used)
{
struct lock_stat *st;
u64 hold_time;
st = lock_stat_findnew(release_event->addr, release_event->name,
release_event->file, release_event->line);
switch (st->state) {
case LOCK_STATE_UNLOCKED:
break;
case LOCK_STATE_LOCKED:
st->state = LOCK_STATE_UNLOCKED;
hold_time = timestamp - st->prev_event_time;
if (timestamp < st->prev_event_time) {
/* terribly, this can happen... */
goto end;
}
if (st->wait_time_min > hold_time)
st->wait_time_min = hold_time;
if (st->wait_time_max < hold_time)
st->wait_time_max = hold_time;
st->wait_time_total += hold_time;
st->nr_release++;
break;
default:
BUG_ON(1);
break;
}
end:
st->prev_event_time = timestamp;
}
/* lock oriented handlers */
/* TODO: handlers for CPU oriented, thread oriented */
static struct trace_lock_handler prof_lock_ops = {
.acquire_event = prof_lock_acquire_event,
.acquired_event = prof_lock_acquired_event,
.contended_event = prof_lock_contended_event,
.release_event = prof_lock_release_event,
};
static struct trace_lock_handler *trace_handler;
static void
process_lock_acquire_event(void *data,
struct event *event __used,
int cpu __used,
u64 timestamp __used,
struct thread *thread __used)
{
struct trace_acquire_event acquire_event;
u64 tmp; /* this is required for casting... */
tmp = raw_field_value(event, "lockdep_addr", data);
memcpy(&acquire_event.addr, &tmp, sizeof(void *));
acquire_event.name = (char *)raw_field_ptr(event, "name", data);
acquire_event.file = (char *)raw_field_ptr(event, "file", data);
acquire_event.line =
(unsigned int)raw_field_value(event, "line", data);
if (trace_handler->acquire_event) {
trace_handler->acquire_event(&acquire_event,
event, cpu, timestamp, thread);
}
}
static void
process_lock_acquired_event(void *data,
struct event *event __used,
int cpu __used,
u64 timestamp __used,
struct thread *thread __used)
{
struct trace_acquired_event acquired_event;
u64 tmp; /* this is required for casting... */
tmp = raw_field_value(event, "lockdep_addr", data);
memcpy(&acquired_event.addr, &tmp, sizeof(void *));
acquired_event.name = (char *)raw_field_ptr(event, "name", data);
acquired_event.file = (char *)raw_field_ptr(event, "file", data);
acquired_event.line =
(unsigned int)raw_field_value(event, "line", data);
if (trace_handler->acquire_event) {
trace_handler->acquired_event(&acquired_event,
event, cpu, timestamp, thread);
}
}
static void
process_lock_contended_event(void *data,
struct event *event __used,
int cpu __used,
u64 timestamp __used,
struct thread *thread __used)
{
struct trace_contended_event contended_event;
u64 tmp; /* this is required for casting... */
tmp = raw_field_value(event, "lockdep_addr", data);
memcpy(&contended_event.addr, &tmp, sizeof(void *));
contended_event.name = (char *)raw_field_ptr(event, "name", data);
contended_event.file = (char *)raw_field_ptr(event, "file", data);
contended_event.line =
(unsigned int)raw_field_value(event, "line", data);
if (trace_handler->acquire_event) {
trace_handler->contended_event(&contended_event,
event, cpu, timestamp, thread);
}
}
static void
process_lock_release_event(void *data,
struct event *event __used,
int cpu __used,
u64 timestamp __used,
struct thread *thread __used)
{
struct trace_release_event release_event;
u64 tmp; /* this is required for casting... */
tmp = raw_field_value(event, "lockdep_addr", data);
memcpy(&release_event.addr, &tmp, sizeof(void *));
release_event.name = (char *)raw_field_ptr(event, "name", data);
release_event.file = (char *)raw_field_ptr(event, "file", data);
release_event.line =
(unsigned int)raw_field_value(event, "line", data);
if (trace_handler->acquire_event) {
trace_handler->release_event(&release_event,
event, cpu, timestamp, thread);
}
}
static void
process_raw_event(void *data, int cpu,
u64 timestamp, struct thread *thread)
{
struct event *event;
int type;
type = trace_parse_common_type(data);
event = trace_find_event(type);
if (!strcmp(event->name, "lock_acquire"))
process_lock_acquire_event(data, event, cpu, timestamp, thread);
if (!strcmp(event->name, "lock_acquired"))
process_lock_acquired_event(data, event, cpu, timestamp, thread);
if (!strcmp(event->name, "lock_contended"))
process_lock_contended_event(data, event, cpu, timestamp, thread);
if (!strcmp(event->name, "lock_release"))
process_lock_release_event(data, event, cpu, timestamp, thread);
}
static int process_sample_event(event_t *event, struct perf_session *session)
{
struct thread *thread;
struct sample_data data;
bzero(&data, sizeof(struct sample_data));
event__parse_sample(event, session->sample_type, &data);
thread = perf_session__findnew(session, data.pid);
/*
* FIXME: this causes warn on 32bit environment
* because of (void *)data.ip (type of data.ip is u64)
*/
/* dump_printf("(IP, %d): %d/%d: %p period: %llu\n", */
/* event->header.misc, */
/* data.pid, data.tid, (void *)data.ip, data.period); */
if (thread == NULL) {
pr_debug("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
if (profile_cpu != -1 && profile_cpu != (int) data.cpu)
return 0;
process_raw_event(data.raw_data, data.cpu, data.time, thread);
return 0;
}
/* TODO: various way to print, coloring, nano or milli sec */
static void print_result(void)
{
struct lock_stat *st;
char cut_name[20];
printf("%18s ", "ID");
printf("%20s ", "Name");
printf("%10s ", "acquired");
printf("%10s ", "contended");
printf("%15s ", "total wait (ns)");
printf("%15s ", "max wait (ns)");
printf("%15s ", "min wait (ns)");
printf("\n\n");
while ((st = pop_from_result())) {
bzero(cut_name, 20);
printf("%p ", st->addr);
if (strlen(st->name) < 16) {
/* output raw name */
printf("%20s ", st->name);
} else {
strncpy(cut_name, st->name, 16);
cut_name[16] = '.';
cut_name[17] = '.';
cut_name[18] = '.';
cut_name[19] = '\0';
/* cut off name for saving output style */
printf("%20s ", cut_name);
}
printf("%10u ", st->nr_acquired);
printf("%10u ", st->nr_contended);
printf("%15llu ", st->wait_time_total);
printf("%15llu ", st->wait_time_max);
printf("%15llu ", st->wait_time_min == ULLONG_MAX ?
0 : st->wait_time_min);
printf("\n");
}
}
static void dump_map(void)
{
unsigned int i;
struct lock_stat *st;
for (i = 0; i < LOCKHASH_SIZE; i++) {
list_for_each_entry(st, &lockhash_table[i], hash_entry) {
printf("%p: %s (src: %s, line: %u)\n",
st->addr, st->name, st->file, st->line);
}
}
}
static struct perf_event_ops eops = {
.sample = process_sample_event,
.comm = event__process_comm,
};
static struct perf_session *session;
static int read_events(void)
{
session = perf_session__new(input_name, O_RDONLY, 0);
if (!session)
die("Initializing perf session failed\n");
return perf_session__process_events(session, &eops);
}
static void sort_result(void)
{
unsigned int i;
struct lock_stat *st;
for (i = 0; i < LOCKHASH_SIZE; i++) {
list_for_each_entry(st, &lockhash_table[i], hash_entry) {
insert_to_result(st, compare);
}
}
}
static void __cmd_prof(void)
{
setup_pager();
select_key();
read_events();
sort_result();
print_result();
}
static const char * const prof_usage[] = {
"perf sched prof [<options>]",
NULL
};
static const struct option prof_options[] = {
OPT_STRING('k', "key", &sort_key, "acquired",
"key for sorting"),
/* TODO: type */
OPT_END()
};
static const char * const lock_usage[] = {
"perf lock [<options>] {record|trace|prof}",
NULL
};
static const struct option lock_options[] = {
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_END()
};
static const char *record_args[] = {
"record",
"-a",
"-R",
"-M",
"-f",
"-m", "1024",
"-c", "1",
"-e", "lock:lock_acquire:r",
"-e", "lock:lock_acquired:r",
"-e", "lock:lock_contended:r",
"-e", "lock:lock_release:r",
};
static int __cmd_record(int argc, const char **argv)
{
unsigned int rec_argc, i, j;
const char **rec_argv;
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = argv[j];
BUG_ON(i != rec_argc);
return cmd_record(i, rec_argv, NULL);
}
int cmd_lock(int argc, const char **argv, const char *prefix __used)
{
unsigned int i;
symbol__init();
for (i = 0; i < LOCKHASH_SIZE; i++)
INIT_LIST_HEAD(lockhash_table + i);
argc = parse_options(argc, argv, lock_options, lock_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
usage_with_options(lock_usage, lock_options);
if (!strncmp(argv[0], "rec", 3)) {
return __cmd_record(argc, argv);
} else if (!strncmp(argv[0], "prof", 4)) {
trace_handler = &prof_lock_ops;
if (argc) {
argc = parse_options(argc, argv,
prof_options, prof_usage, 0);
if (argc)
usage_with_options(prof_usage, prof_options);
}
__cmd_prof();
} else if (!strcmp(argv[0], "trace")) {
/* Aliased to 'perf trace' */
return cmd_trace(argc, argv, prefix);
} else if (!strcmp(argv[0], "map")) {
/* recycling prof_lock_ops */
trace_handler = &prof_lock_ops;
setup_pager();
read_events();
dump_map();
} else {
usage_with_options(lock_usage, lock_options);
}
return 0;
}

1
tools/perf/builtin.h
View File

@ -31,5 +31,6 @@ extern int cmd_trace(int argc, const char **argv, const char *prefix);
extern int cmd_version(int argc, const char **argv, const char *prefix);
extern int cmd_probe(int argc, const char **argv, const char *prefix);
extern int cmd_kmem(int argc, const char **argv, const char *prefix);
extern int cmd_lock(int argc, const char **argv, const char *prefix);
#endif

1
tools/perf/perf.c
View File

@ -303,6 +303,7 @@ static void handle_internal_command(int argc, const char **argv)
{ "sched", cmd_sched, 0 },
{ "probe", cmd_probe, 0 },
{ "kmem", cmd_kmem, 0 },
{ "lock", cmd_lock, 0 },
};
unsigned int i;
static const char ext[] = STRIP_EXTENSION;