Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1034 insertions, 0 deletions

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
new file mode 100644
index 000000000..0cb7f7b73
--- /dev/null
+++ b/tools/perf/builtin-lock.c
@@ -0,0 +1,1034 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <inttypes.h>
+#include "builtin.h"
+#include "perf.h"
+
+#include "util/evlist.h"
+#include "util/evsel.h"
+#include "util/util.h"
+#include "util/cache.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/header.h"
+
+#include <subcmd/parse-options.h>
+#include "util/trace-event.h"
+
+#include "util/debug.h"
+#include "util/session.h"
+#include "util/tool.h"
+#include "util/data.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>
+#include <linux/kernel.h>
+
+static struct perf_session *session;
+
+/* 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)))
+
+struct lock_stat {
+	struct list_head	hash_entry;
+	struct rb_node		rb;		/* used for sorting */
+
+	/*
+	 * FIXME: perf_evsel__intval() returns u64,
+	 * 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 */
+
+	unsigned int		nr_acquire;
+	unsigned int		nr_acquired;
+	unsigned int		nr_contended;
+	unsigned int		nr_release;
+
+	unsigned int		nr_readlock;
+	unsigned int		nr_trylock;
+
+	/* these times are in nano sec. */
+	u64                     avg_wait_time;
+	u64			wait_time_total;
+	u64			wait_time_min;
+	u64			wait_time_max;
+
+	int			discard; /* flag of blacklist */
+};
+
+/*
+ * States of lock_seq_stat
+ *
+ * UNINITIALIZED is required for detecting first event of acquire.
+ * As the nature of lock events, there is no guarantee
+ * that the first event for the locks are acquire,
+ * it can be acquired, contended or release.
+ */
+#define SEQ_STATE_UNINITIALIZED      0	       /* initial state */
+#define SEQ_STATE_RELEASED	1
+#define SEQ_STATE_ACQUIRING	2
+#define SEQ_STATE_ACQUIRED	3
+#define SEQ_STATE_READ_ACQUIRED	4
+#define SEQ_STATE_CONTENDED	5
+
+/*
+ * MAX_LOCK_DEPTH
+ * Imported from include/linux/sched.h.
+ * Should this be synchronized?
+ */
+#define MAX_LOCK_DEPTH 48
+
+/*
+ * struct lock_seq_stat:
+ * Place to put on state of one lock sequence
+ * 1) acquire -> acquired -> release
+ * 2) acquire -> contended -> acquired -> release
+ * 3) acquire (with read or try) -> release
+ * 4) Are there other patterns?
+ */
+struct lock_seq_stat {
+	struct list_head        list;
+	int			state;
+	u64			prev_event_time;
+	void                    *addr;
+
+	int                     read_count;
+};
+
+struct thread_stat {
+	struct rb_node		rb;
+
+	u32                     tid;
+	struct list_head        seq_list;
+};
+
+static struct rb_root		thread_stats;
+
+static struct thread_stat *thread_stat_find(u32 tid)
+{
+	struct rb_node *node;
+	struct thread_stat *st;
+
+	node = thread_stats.rb_node;
+	while (node) {
+		st = container_of(node, struct thread_stat, rb);
+		if (st->tid == tid)
+			return st;
+		else if (tid < st->tid)
+			node = node->rb_left;
+		else
+			node = node->rb_right;
+	}
+
+	return NULL;
+}
+
+static void thread_stat_insert(struct thread_stat *new)
+{
+	struct rb_node **rb = &thread_stats.rb_node;
+	struct rb_node *parent = NULL;
+	struct thread_stat *p;
+
+	while (*rb) {
+		p = container_of(*rb, struct thread_stat, rb);
+		parent = *rb;
+
+		if (new->tid < p->tid)
+			rb = &(*rb)->rb_left;
+		else if (new->tid > p->tid)
+			rb = &(*rb)->rb_right;
+		else
+			BUG_ON("inserting invalid thread_stat\n");
+	}
+
+	rb_link_node(&new->rb, parent, rb);
+	rb_insert_color(&new->rb, &thread_stats);
+}
+
+static struct thread_stat *thread_stat_findnew_after_first(u32 tid)
+{
+	struct thread_stat *st;
+
+	st = thread_stat_find(tid);
+	if (st)
+		return st;
+
+	st = zalloc(sizeof(struct thread_stat));
+	if (!st) {
+		pr_err("memory allocation failed\n");
+		return NULL;
+	}
+
+	st->tid = tid;
+	INIT_LIST_HEAD(&st->seq_list);
+
+	thread_stat_insert(st);
+
+	return st;
+}
+
+static struct thread_stat *thread_stat_findnew_first(u32 tid);
+static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
+	thread_stat_findnew_first;
+
+static struct thread_stat *thread_stat_findnew_first(u32 tid)
+{
+	struct thread_stat *st;
+
+	st = zalloc(sizeof(struct thread_stat));
+	if (!st) {
+		pr_err("memory allocation failed\n");
+		return NULL;
+	}
+	st->tid = tid;
+	INIT_LIST_HEAD(&st->seq_list);
+
+	rb_link_node(&st->rb, NULL, &thread_stats.rb_node);
+	rb_insert_color(&st->rb, &thread_stats);
+
+	thread_stat_findnew = thread_stat_findnew_after_first;
+	return st;
+}
+
+/* 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(avg_wait_time)
+SINGLE_KEY(wait_time_total)
+SINGLE_KEY(wait_time_max)
+
+static int lock_stat_key_wait_time_min(struct lock_stat *one,
+					struct lock_stat *two)
+{
+	u64 s1 = one->wait_time_min;
+	u64 s2 = two->wait_time_min;
+	if (s1 == ULLONG_MAX)
+		s1 = 0;
+	if (s2 == ULLONG_MAX)
+		s2 = 0;
+	return s1 > s2;
+}
+
+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 *);
+
+static struct rb_root		result;	/* place to store sorted data */
+
+#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(avg_wait, avg_wait_time),
+	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 int select_key(void)
+{
+	int i;
+
+	for (i = 0; keys[i].name; i++) {
+		if (!strcmp(keys[i].name, sort_key)) {
+			compare = keys[i].key;
+			return 0;
+		}
+	}
+
+	pr_err("Unknown compare key: %s\n", sort_key);
+
+	return -1;
+}
+
+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)
+{
+	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) {
+		free(new);
+		goto alloc_failed;
+	}
+
+	strcpy(new->name, name);
+	new->wait_time_min = ULLONG_MAX;
+
+	list_add(&new->hash_entry, entry);
+	return new;
+
+alloc_failed:
+	pr_err("memory allocation failed\n");
+	return NULL;
+}
+
+struct trace_lock_handler {
+	int (*acquire_event)(struct perf_evsel *evsel,
+			     struct perf_sample *sample);
+
+	int (*acquired_event)(struct perf_evsel *evsel,
+			      struct perf_sample *sample);
+
+	int (*contended_event)(struct perf_evsel *evsel,
+			       struct perf_sample *sample);
+
+	int (*release_event)(struct perf_evsel *evsel,
+			     struct perf_sample *sample);
+};
+
+static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
+{
+	struct lock_seq_stat *seq;
+
+	list_for_each_entry(seq, &ts->seq_list, list) {
+		if (seq->addr == addr)
+			return seq;
+	}
+
+	seq = zalloc(sizeof(struct lock_seq_stat));
+	if (!seq) {
+		pr_err("memory allocation failed\n");
+		return NULL;
+	}
+	seq->state = SEQ_STATE_UNINITIALIZED;
+	seq->addr = addr;
+
+	list_add(&seq->list, &ts->seq_list);
+	return seq;
+}
+
+enum broken_state {
+	BROKEN_ACQUIRE,
+	BROKEN_ACQUIRED,
+	BROKEN_CONTENDED,
+	BROKEN_RELEASE,
+	BROKEN_MAX,
+};
+
+static int bad_hist[BROKEN_MAX];
+
+enum acquire_flags {
+	TRY_LOCK = 1,
+	READ_LOCK = 2,
+};
+
+static int report_lock_acquire_event(struct perf_evsel *evsel,
+				     struct perf_sample *sample)
+{
+	void *addr;
+	struct lock_stat *ls;
+	struct thread_stat *ts;
+	struct lock_seq_stat *seq;
+	const char *name = perf_evsel__strval(evsel, sample, "name");
+	u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
+	int flag = perf_evsel__intval(evsel, sample, "flag");
+
+	memcpy(&addr, &tmp, sizeof(void *));
+
+	ls = lock_stat_findnew(addr, name);
+	if (!ls)
+		return -ENOMEM;
+	if (ls->discard)
+		return 0;
+
+	ts = thread_stat_findnew(sample->tid);
+	if (!ts)
+		return -ENOMEM;
+
+	seq = get_seq(ts, addr);
+	if (!seq)
+		return -ENOMEM;
+
+	switch (seq->state) {
+	case SEQ_STATE_UNINITIALIZED:
+	case SEQ_STATE_RELEASED:
+		if (!flag) {
+			seq->state = SEQ_STATE_ACQUIRING;
+		} else {
+			if (flag & TRY_LOCK)
+				ls->nr_trylock++;
+			if (flag & READ_LOCK)
+				ls->nr_readlock++;
+			seq->state = SEQ_STATE_READ_ACQUIRED;
+			seq->read_count = 1;
+			ls->nr_acquired++;
+		}
+		break;
+	case SEQ_STATE_READ_ACQUIRED:
+		if (flag & READ_LOCK) {
+			seq->read_count++;
+			ls->nr_acquired++;
+			goto end;
+		} else {
+			goto broken;
+		}
+		break;
+	case SEQ_STATE_ACQUIRED:
+	case SEQ_STATE_ACQUIRING:
+	case SEQ_STATE_CONTENDED:
+broken:
+		/* broken lock sequence, discard it */
+		ls->discard = 1;
+		bad_hist[BROKEN_ACQUIRE]++;
+		list_del(&seq->list);
+		free(seq);
+		goto end;
+	default:
+		BUG_ON("Unknown state of lock sequence found!\n");
+		break;
+	}
+
+	ls->nr_acquire++;
+	seq->prev_event_time = sample->time;
+end:
+	return 0;
+}
+
+static int report_lock_acquired_event(struct perf_evsel *evsel,
+				      struct perf_sample *sample)
+{
+	void *addr;
+	struct lock_stat *ls;
+	struct thread_stat *ts;
+	struct lock_seq_stat *seq;
+	u64 contended_term;
+	const char *name = perf_evsel__strval(evsel, sample, "name");
+	u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
+
+	memcpy(&addr, &tmp, sizeof(void *));
+
+	ls = lock_stat_findnew(addr, name);
+	if (!ls)
+		return -ENOMEM;
+	if (ls->discard)
+		return 0;
+
+	ts = thread_stat_findnew(sample->tid);
+	if (!ts)
+		return -ENOMEM;
+
+	seq = get_seq(ts, addr);
+	if (!seq)
+		return -ENOMEM;
+
+	switch (seq->state) {
+	case SEQ_STATE_UNINITIALIZED:
+		/* orphan event, do nothing */
+		return 0;
+	case SEQ_STATE_ACQUIRING:
+		break;
+	case SEQ_STATE_CONTENDED:
+		contended_term = sample->time - seq->prev_event_time;
+		ls->wait_time_total += contended_term;
+		if (contended_term < ls->wait_time_min)
+			ls->wait_time_min = contended_term;
+		if (ls->wait_time_max < contended_term)
+			ls->wait_time_max = contended_term;
+		break;
+	case SEQ_STATE_RELEASED:
+	case SEQ_STATE_ACQUIRED:
+	case SEQ_STATE_READ_ACQUIRED:
+		/* broken lock sequence, discard it */
+		ls->discard = 1;
+		bad_hist[BROKEN_ACQUIRED]++;
+		list_del(&seq->list);
+		free(seq);
+		goto end;
+	default:
+		BUG_ON("Unknown state of lock sequence found!\n");
+		break;
+	}
+
+	seq->state = SEQ_STATE_ACQUIRED;
+	ls->nr_acquired++;
+	ls->avg_wait_time = ls->nr_contended ? ls->wait_time_total/ls->nr_contended : 0;
+	seq->prev_event_time = sample->time;
+end:
+	return 0;
+}
+
+static int report_lock_contended_event(struct perf_evsel *evsel,
+				       struct perf_sample *sample)
+{
+	void *addr;
+	struct lock_stat *ls;
+	struct thread_stat *ts;
+	struct lock_seq_stat *seq;
+	const char *name = perf_evsel__strval(evsel, sample, "name");
+	u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
+
+	memcpy(&addr, &tmp, sizeof(void *));
+
+	ls = lock_stat_findnew(addr, name);
+	if (!ls)
+		return -ENOMEM;
+	if (ls->discard)
+		return 0;
+
+	ts = thread_stat_findnew(sample->tid);
+	if (!ts)
+		return -ENOMEM;
+
+	seq = get_seq(ts, addr);
+	if (!seq)
+		return -ENOMEM;
+
+	switch (seq->state) {
+	case SEQ_STATE_UNINITIALIZED:
+		/* orphan event, do nothing */
+		return 0;
+	case SEQ_STATE_ACQUIRING:
+		break;
+	case SEQ_STATE_RELEASED:
+	case SEQ_STATE_ACQUIRED:
+	case SEQ_STATE_READ_ACQUIRED:
+	case SEQ_STATE_CONTENDED:
+		/* broken lock sequence, discard it */
+		ls->discard = 1;
+		bad_hist[BROKEN_CONTENDED]++;
+		list_del(&seq->list);
+		free(seq);
+		goto end;
+	default:
+		BUG_ON("Unknown state of lock sequence found!\n");
+		break;
+	}
+
+	seq->state = SEQ_STATE_CONTENDED;
+	ls->nr_contended++;
+	ls->avg_wait_time = ls->wait_time_total/ls->nr_contended;
+	seq->prev_event_time = sample->time;
+end:
+	return 0;
+}
+
+static int report_lock_release_event(struct perf_evsel *evsel,
+				     struct perf_sample *sample)
+{
+	void *addr;
+	struct lock_stat *ls;
+	struct thread_stat *ts;
+	struct lock_seq_stat *seq;
+	const char *name = perf_evsel__strval(evsel, sample, "name");
+	u64 tmp = perf_evsel__intval(evsel, sample, "lockdep_addr");
+
+	memcpy(&addr, &tmp, sizeof(void *));
+
+	ls = lock_stat_findnew(addr, name);
+	if (!ls)
+		return -ENOMEM;
+	if (ls->discard)
+		return 0;
+
+	ts = thread_stat_findnew(sample->tid);
+	if (!ts)
+		return -ENOMEM;
+
+	seq = get_seq(ts, addr);
+	if (!seq)
+		return -ENOMEM;
+
+	switch (seq->state) {
+	case SEQ_STATE_UNINITIALIZED:
+		goto end;
+	case SEQ_STATE_ACQUIRED:
+		break;
+	case SEQ_STATE_READ_ACQUIRED:
+		seq->read_count--;
+		BUG_ON(seq->read_count < 0);
+		if (seq->read_count) {
+			ls->nr_release++;
+			goto end;
+		}
+		break;
+	case SEQ_STATE_ACQUIRING:
+	case SEQ_STATE_CONTENDED:
+	case SEQ_STATE_RELEASED:
+		/* broken lock sequence, discard it */
+		ls->discard = 1;
+		bad_hist[BROKEN_RELEASE]++;
+		goto free_seq;
+	default:
+		BUG_ON("Unknown state of lock sequence found!\n");
+		break;
+	}
+
+	ls->nr_release++;
+free_seq:
+	list_del(&seq->list);
+	free(seq);
+end:
+	return 0;
+}
+
+/* lock oriented handlers */
+/* TODO: handlers for CPU oriented, thread oriented */
+static struct trace_lock_handler report_lock_ops  = {
+	.acquire_event		= report_lock_acquire_event,
+	.acquired_event		= report_lock_acquired_event,
+	.contended_event	= report_lock_contended_event,
+	.release_event		= report_lock_release_event,
+};
+
+static struct trace_lock_handler *trace_handler;
+
+static int perf_evsel__process_lock_acquire(struct perf_evsel *evsel,
+					     struct perf_sample *sample)
+{
+	if (trace_handler->acquire_event)
+		return trace_handler->acquire_event(evsel, sample);
+	return 0;
+}
+
+static int perf_evsel__process_lock_acquired(struct perf_evsel *evsel,
+					      struct perf_sample *sample)
+{
+	if (trace_handler->acquired_event)
+		return trace_handler->acquired_event(evsel, sample);
+	return 0;
+}
+
+static int perf_evsel__process_lock_contended(struct perf_evsel *evsel,
+					      struct perf_sample *sample)
+{
+	if (trace_handler->contended_event)
+		return trace_handler->contended_event(evsel, sample);
+	return 0;
+}
+
+static int perf_evsel__process_lock_release(struct perf_evsel *evsel,
+					    struct perf_sample *sample)
+{
+	if (trace_handler->release_event)
+		return trace_handler->release_event(evsel, sample);
+	return 0;
+}
+
+static void print_bad_events(int bad, int total)
+{
+	/* Output for debug, this have to be removed */
+	int i;
+	const char *name[4] =
+		{ "acquire", "acquired", "contended", "release" };
+
+	pr_info("\n=== output for debug===\n\n");
+	pr_info("bad: %d, total: %d\n", bad, total);
+	pr_info("bad rate: %.2f %%\n", (double)bad / (double)total * 100);
+	pr_info("histogram of events caused bad sequence\n");
+	for (i = 0; i < BROKEN_MAX; i++)
+		pr_info(" %10s: %d\n", name[i], bad_hist[i]);
+}
+
+/* TODO: various way to print, coloring, nano or milli sec */
+static void print_result(void)
+{
+	struct lock_stat *st;
+	char cut_name[20];
+	int bad, total;
+
+	pr_info("%20s ", "Name");
+	pr_info("%10s ", "acquired");
+	pr_info("%10s ", "contended");
+
+	pr_info("%15s ", "avg wait (ns)");
+	pr_info("%15s ", "total wait (ns)");
+	pr_info("%15s ", "max wait (ns)");
+	pr_info("%15s ", "min wait (ns)");
+
+	pr_info("\n\n");
+
+	bad = total = 0;
+	while ((st = pop_from_result())) {
+		total++;
+		if (st->discard) {
+			bad++;
+			continue;
+		}
+		bzero(cut_name, 20);
+
+		if (strlen(st->name) < 16) {
+			/* output raw name */
+			pr_info("%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 */
+			pr_info("%20s ", cut_name);
+		}
+
+		pr_info("%10u ", st->nr_acquired);
+		pr_info("%10u ", st->nr_contended);
+
+		pr_info("%15" PRIu64 " ", st->avg_wait_time);
+		pr_info("%15" PRIu64 " ", st->wait_time_total);
+		pr_info("%15" PRIu64 " ", st->wait_time_max);
+		pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
+		       0 : st->wait_time_min);
+		pr_info("\n");
+	}
+
+	print_bad_events(bad, total);
+}
+
+static bool info_threads, 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, thread__comm_str(t));
+		node = rb_next(node);
+		thread__put(t);
+	};
+}
+
+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) {
+			pr_info(" %p: %s\n", st->addr, st->name);
+		}
+	}
+}
+
+static int dump_info(void)
+{
+	int rc = 0;
+
+	if (info_threads)
+		dump_threads();
+	else if (info_map)
+		dump_map();
+	else {
+		rc = -1;
+		pr_err("Unknown type of information\n");
+	}
+
+	return rc;
+}
+
+typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
+				  struct perf_sample *sample);
+
+static int process_sample_event(struct perf_tool *tool __maybe_unused,
+				union perf_event *event,
+				struct perf_sample *sample,
+				struct perf_evsel *evsel,
+				struct machine *machine)
+{
+	int err = 0;
+	struct thread *thread = machine__findnew_thread(machine, sample->pid,
+							sample->tid);
+
+	if (thread == NULL) {
+		pr_debug("problem processing %d event, skipping it.\n",
+			event->header.type);
+		return -1;
+	}
+
+	if (evsel->handler != NULL) {
+		tracepoint_handler f = evsel->handler;
+		err = f(evsel, sample);
+	}
+
+	thread__put(thread);
+
+	return err;
+}
+
+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 const struct perf_evsel_str_handler lock_tracepoints[] = {
+	{ "lock:lock_acquire",	 perf_evsel__process_lock_acquire,   }, /* CONFIG_LOCKDEP */
+	{ "lock:lock_acquired",	 perf_evsel__process_lock_acquired,  }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
+	{ "lock:lock_contended", perf_evsel__process_lock_contended, }, /* CONFIG_LOCKDEP, CONFIG_LOCK_STAT */
+	{ "lock:lock_release",	 perf_evsel__process_lock_release,   }, /* CONFIG_LOCKDEP */
+};
+
+static bool force;
+
+static int __cmd_report(bool display_info)
+{
+	int err = -EINVAL;
+	struct perf_tool eops = {
+		.sample		 = process_sample_event,
+		.comm		 = perf_event__process_comm,
+		.namespaces	 = perf_event__process_namespaces,
+		.ordered_events	 = true,
+	};
+	struct perf_data data = {
+		.file      = {
+			.path = input_name,
+		},
+		.mode      = PERF_DATA_MODE_READ,
+		.force     = force,
+	};
+
+	session = perf_session__new(&data, false, &eops);
+	if (!session) {
+		pr_err("Initializing perf session failed\n");
+		return -1;
+	}
+
+	symbol__init(&session->header.env);
+
+	if (!perf_session__has_traces(session, "lock record"))
+		goto out_delete;
+
+	if (perf_session__set_tracepoints_handlers(session, lock_tracepoints)) {
+		pr_err("Initializing perf session tracepoint handlers failed\n");
+		goto out_delete;
+	}
+
+	if (select_key())
+		goto out_delete;
+
+	err = perf_session__process_events(session);
+	if (err)
+		goto out_delete;
+
+	setup_pager();
+	if (display_info) /* used for info subcommand */
+		err = dump_info();
+	else {
+		sort_result();
+		print_result();
+	}
+
+out_delete:
+	perf_session__delete(session);
+	return err;
+}
+
+static int __cmd_record(int argc, const char **argv)
+{
+	const char *record_args[] = {
+		"record", "-R", "-m", "1024", "-c", "1",
+	};
+	unsigned int rec_argc, i, j, ret;
+	const char **rec_argv;
+
+	for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) {
+		if (!is_valid_tracepoint(lock_tracepoints[i].name)) {
+				pr_err("tracepoint %s is not enabled. "
+				       "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n",
+				       lock_tracepoints[i].name);
+				return 1;
+		}
+	}
+
+	rec_argc = ARRAY_SIZE(record_args) + argc - 1;
+	/* factor of 2 is for -e in front of each tracepoint */
+	rec_argc += 2 * ARRAY_SIZE(lock_tracepoints);
+
+	rec_argv = calloc(rec_argc + 1, sizeof(char *));
+	if (!rec_argv)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(record_args); i++)
+		rec_argv[i] = strdup(record_args[i]);
+
+	for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) {
+		rec_argv[i++] = "-e";
+		rec_argv[i++] = strdup(lock_tracepoints[j].name);
+	}
+
+	for (j = 1; j < (unsigned int)argc; j++, i++)
+		rec_argv[i] = argv[j];
+
+	BUG_ON(i != rec_argc);
+
+	ret = cmd_record(i, rec_argv);
+	free(rec_argv);
+	return ret;
+}
+
+int cmd_lock(int argc, const char **argv)
+{
+	const struct option lock_options[] = {
+	OPT_STRING('i', "input", &input_name, "file", "input file name"),
+	OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
+	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
+	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+	OPT_END()
+	};
+
+	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 (address:name table)"),
+	OPT_PARENT(lock_options)
+	};
+
+	const struct option report_options[] = {
+	OPT_STRING('k', "key", &sort_key, "acquired",
+		    "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
+	/* TODO: type */
+	OPT_PARENT(lock_options)
+	};
+
+	const char * const info_usage[] = {
+		"perf lock info [<options>]",
+		NULL
+	};
+	const char *const lock_subcommands[] = { "record", "report", "script",
+						 "info", NULL };
+	const char *lock_usage[] = {
+		NULL,
+		NULL
+	};
+	const char * const report_usage[] = {
+		"perf lock report [<options>]",
+		NULL
+	};
+	unsigned int i;
+	int rc = 0;
+
+	for (i = 0; i < LOCKHASH_SIZE; i++)
+		INIT_LIST_HEAD(lockhash_table + i);
+
+	argc = parse_options_subcommand(argc, argv, lock_options, lock_subcommands,
+					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], "report", 6)) {
+		trace_handler = &report_lock_ops;
+		if (argc) {
+			argc = parse_options(argc, argv,
+					     report_options, report_usage, 0);
+			if (argc)
+				usage_with_options(report_usage, report_options);
+		}
+		rc = __cmd_report(false);
+	} else if (!strcmp(argv[0], "script")) {
+		/* Aliased to 'perf script' */
+		return cmd_script(argc, argv);
+	} 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;
+		rc = __cmd_report(true);
+	} else {
+		usage_with_options(lock_usage, lock_options);
+	}
+
+	return rc;
+}