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perf lock: Add "info" subcommand for dumping misc information 

This adds the "info" subcommand to perf lock which can be used
to dump metadata like threads or addresses of lock instances.
"map" was removed because info should do the work for it.

This will be useful not only for debugging but also for ordinary
analyzing.

v2: adding example of usage
% sudo ./perf lock info -t
 | Thread ID: comm
 | 	 0: swapper
 |         1: init
 |        18: migration/5
 |        29: events/2
 |        32: events/5
 |        33: events/6
...

% sudo ./perf lock info -m
| Address of instance: name of class
|  0xffff8800b95adae0: &(&sighand->siglock)->rlock
|  0xffff8800bbb41ae0: &(&sighand->siglock)->rlock
|  0xffff8800bf165ae0: &(&sighand->siglock)->rlock
|  0xffff8800b9576a98: &p->cred_guard_mutex
|  0xffff8800bb890a08: &(&p->alloc_lock)->rlock
|  0xffff8800b9522a08: &(&p->alloc_lock)->rlock
|  0xffff8800bb8aaa08: &(&p->alloc_lock)->rlock
|  0xffff8800bba72a08: &(&p->alloc_lock)->rlock
|  0xffff8800bf18ea08: &(&p->alloc_lock)->rlock
|  0xffff8800b8a0d8a0: &(&ip->i_lock)->mr_lock
|  0xffff88009bf818a0: &(&ip->i_lock)->mr_lock
|  0xffff88004c66b8a0: &(&ip->i_lock)->mr_lock
|  0xffff8800bb6478a0: &(shost->host_lock)->rlock

v3: fixed some problems Frederic pointed out
 * better rbtree tracking in dump_threads()
 * removed printf() and used pr_info() and pr_debug()

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
LKML-Reference: <1272863520-16179-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Hitoshi Mitake 2010-05-03 14:12:00 +09:00 committed by Frederic Weisbecker
parent d6b17bebd7
commit 26242d859c
1 changed files with 73 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
tools/perf/builtin-lock.c
View File

@ -720,15 +720,15 @@ static void print_result(void)
char cut_name[20];
int bad, total;
printf("%20s ", "Name");
printf("%10s ", "acquired");
printf("%10s ", "contended");
pr_info("%20s ", "Name");
pr_info("%10s ", "acquired");
pr_info("%10s ", "contended");
printf("%15s ", "total wait (ns)");
printf("%15s ", "max wait (ns)");
printf("%15s ", "min wait (ns)");
pr_info("%15s ", "total wait (ns)");
pr_info("%15s ", "max wait (ns)");
pr_info("%15s ", "min wait (ns)");
printf("\n\n");
pr_info("\n\n");
bad = total = 0;
while ((st = pop_from_result())) {
@ -741,7 +741,7 @@ static void print_result(void)
if (strlen(st->name) < 16) {
/* output raw name */
printf("%20s ", st->name);
pr_info("%20s ", st->name);
} else {
strncpy(cut_name, st->name, 16);
cut_name[16] = '.';
@ -749,17 +749,17 @@ static void print_result(void)
cut_name[18] = '.';
cut_name[19] = '\0';
/* cut off name for saving output style */
printf("%20s ", cut_name);
pr_info("%20s ", cut_name);
}
printf("%10u ", st->nr_acquired);
printf("%10u ", st->nr_contended);
pr_info("%10u ", st->nr_acquired);
pr_info("%10u ", st->nr_contended);
printf("%15llu ", st->wait_time_total);
printf("%15llu ", st->wait_time_max);
printf("%15llu ", st->wait_time_min == ULLONG_MAX ?
pr_info("%15llu ", st->wait_time_total);
pr_info("%15llu ", st->wait_time_max);
pr_info("%15llu ", st->wait_time_min == ULLONG_MAX ?
0 : st->wait_time_min);
printf("\n");
pr_info("\n");
}
{
@ -768,28 +768,59 @@ static void print_result(void)
const char *name[4] =
{ "acquire", "acquired", "contended", "release" };
printf("\n=== output for debug===\n\n");
printf("bad:%d, total:%d\n", bad, total);
printf("bad rate:%f\n", (double)(bad / total));
pr_debug("\n=== output for debug===\n\n");
pr_debug("bad:%d, total:%d\n", bad, total);
pr_debug("bad rate:%f\n", (double)(bad / total));
printf("histogram of events caused bad sequence\n");
pr_debug("histogram of events caused bad sequence\n");
for (i = 0; i < 4; i++)
printf(" %10s: %d\n", name[i], bad_hist[i]);
pr_debug(" %10s: %d\n", name[i], bad_hist[i]);
}
}
static int info_threads;
static int info_map;
static void dump_threads(void)
{
struct thread_stat *st;
struct rb_node *node;
struct thread *t;
pr_info("%10s: comm\n", "Thread ID");
node = rb_first(&thread_stats);
while (node) {
st = container_of(node, struct thread_stat, rb);
t = perf_session__findnew(session, st->tid);
pr_info("%10d: %s\n", st->tid, t->comm);
node = rb_next(node);
};
}
static void dump_map(void)
{
unsigned int i;
struct lock_stat *st;
pr_info("Address of instance: name of class\n");
for (i = 0; i < LOCKHASH_SIZE; i++) {
list_for_each_entry(st, &lockhash_table[i], hash_entry) {
printf("%p: %s\n", st->addr, st->name);
pr_info(" %p: %s\n", st->addr, st->name);
}
}
}
static void dump_info(void)
{
if (info_threads)
dump_threads();
else if (info_map)
dump_map();
else
die("Unknown type of information\n");
}
static int process_sample_event(event_t *self, struct perf_session *s)
{
struct sample_data data;
@ -858,6 +889,19 @@ static const struct option report_options[] = {
OPT_END()
};
static const char * const info_usage[] = {
"perf lock info [<options>]",
NULL
};
static const struct option info_options[] = {
OPT_BOOLEAN('t', "threads", &info_threads,
"dump thread list in perf.data"),
OPT_BOOLEAN('m', "map", &info_map,
"map of lock instances (name:address table)"),
OPT_END()
};
static const char * const lock_usage[] = {
"perf lock [<options>] {record|trace|report}",
NULL
@ -929,12 +973,18 @@ int cmd_lock(int argc, const char **argv, const char *prefix __used)
} else if (!strcmp(argv[0], "trace")) {
/* Aliased to 'perf trace' */
return cmd_trace(argc, argv, prefix);
} else if (!strcmp(argv[0], "map")) {
} else if (!strcmp(argv[0], "info")) {
if (argc) {
argc = parse_options(argc, argv,
info_options, info_usage, 0);
if (argc)
usage_with_options(info_usage, info_options);
}
/* recycling report_lock_ops */
trace_handler = &report_lock_ops;
setup_pager();
read_events();
dump_map();
dump_info();
} else {
usage_with_options(lock_usage, lock_options);
}