mm: fix NULL ptr dereference in __count_immobile_pages

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / tools / perf / builtin-lock.c

#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>

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: 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 */

        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                     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)
                die("memory allocation failed\n");

        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)
                die("memory allocation failed\n");
        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(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(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 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)
                goto alloc_failed;
        strcpy(new->name, name);

        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";

struct raw_event_sample {
        u32                     size;
        char                    data[0];
};

struct trace_acquire_event {
        void                    *addr;
        const char              *name;
        int                     flag;
};

struct trace_acquired_event {
        void                    *addr;
        const char              *name;
};

struct trace_contended_event {
        void                    *addr;
        const char              *name;
};

struct trace_release_event {
        void                    *addr;
        const char              *name;
};

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 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)
                die("Not enough memory\n");
        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 void
report_lock_acquire_event(struct trace_acquire_event *acquire_event,
                        struct event *__event __used,
                        int cpu __used,
                        u64 timestamp __used,
                        struct thread *thread __used)
{
        struct lock_stat *ls;
        struct thread_stat *ts;
        struct lock_seq_stat *seq;

        ls = lock_stat_findnew(acquire_event->addr, acquire_event->name);
        if (ls->discard)
                return;

        ts = thread_stat_findnew(thread->pid);
        seq = get_seq(ts, acquire_event->addr);

        switch (seq->state) {
        case SEQ_STATE_UNINITIALIZED:
        case SEQ_STATE_RELEASED:
                if (!acquire_event->flag) {
                        seq->state = SEQ_STATE_ACQUIRING;
                } else {
                        if (acquire_event->flag & TRY_LOCK)
                                ls->nr_trylock++;
                        if (acquire_event->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 (acquire_event->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;
                break;
        default:
                BUG_ON("Unknown state of lock sequence found!\n");
                break;
        }

        ls->nr_acquire++;
        seq->prev_event_time = timestamp;
end:
        return;
}

static void
report_lock_acquired_event(struct trace_acquired_event *acquired_event,
                         struct event *__event __used,
                         int cpu __used,
                         u64 timestamp __used,
                         struct thread *thread __used)
{
        struct lock_stat *ls;
        struct thread_stat *ts;
        struct lock_seq_stat *seq;
        u64 contended_term;

        ls = lock_stat_findnew(acquired_event->addr, acquired_event->name);
        if (ls->discard)
                return;

        ts = thread_stat_findnew(thread->pid);
        seq = get_seq(ts, acquired_event->addr);

        switch (seq->state) {
        case SEQ_STATE_UNINITIALIZED:
                /* orphan event, do nothing */
                return;
        case SEQ_STATE_ACQUIRING:
                break;
        case SEQ_STATE_CONTENDED:
                contended_term = timestamp - 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;
                break;

        default:
                BUG_ON("Unknown state of lock sequence found!\n");
                break;
        }

        seq->state = SEQ_STATE_ACQUIRED;
        ls->nr_acquired++;
        seq->prev_event_time = timestamp;
end:
        return;
}

static void
report_lock_contended_event(struct trace_contended_event *contended_event,
                          struct event *__event __used,
                          int cpu __used,
                          u64 timestamp __used,
                          struct thread *thread __used)
{
        struct lock_stat *ls;
        struct thread_stat *ts;
        struct lock_seq_stat *seq;

        ls = lock_stat_findnew(contended_event->addr, contended_event->name);
        if (ls->discard)
                return;

        ts = thread_stat_findnew(thread->pid);
        seq = get_seq(ts, contended_event->addr);

        switch (seq->state) {
        case SEQ_STATE_UNINITIALIZED:
                /* orphan event, do nothing */
                return;
        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;
                break;
        default:
                BUG_ON("Unknown state of lock sequence found!\n");
                break;
        }

        seq->state = SEQ_STATE_CONTENDED;
        ls->nr_contended++;
        seq->prev_event_time = timestamp;
end:
        return;
}

static void
report_lock_release_event(struct trace_release_event *release_event,
                        struct event *__event __used,
                        int cpu __used,
                        u64 timestamp __used,
                        struct thread *thread __used)
{
        struct lock_stat *ls;
        struct thread_stat *ts;
        struct lock_seq_stat *seq;

        ls = lock_stat_findnew(release_event->addr, release_event->name);
        if (ls->discard)
                return;

        ts = thread_stat_findnew(thread->pid);
        seq = get_seq(ts, release_event->addr);

        switch (seq->state) {
        case SEQ_STATE_UNINITIALIZED:
                goto end;
                break;
        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;
                break;
        default:
                BUG_ON("Unknown state of lock sequence found!\n");
                break;
        }

        ls->nr_release++;
free_seq:
        list_del(&seq->list);
        free(seq);
end:
        return;
}

/* 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 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.flag = (int)raw_field_value(event, "flag", 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);

        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);

        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);

        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 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: %f %%\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 ", "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->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, 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) {
                        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(union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel __used,
                                struct perf_session *s)
{
        struct thread *thread = perf_session__findnew(s, sample->tid);

        if (thread == NULL) {
                pr_debug("problem processing %d event, skipping it.\n",
                        event->header.type);
                return -1;
        }

        process_raw_event(sample->raw_data, sample->cpu, sample->time, thread);

        return 0;
}

static struct perf_event_ops eops = {
        .sample                 = process_sample_event,
        .comm                   = perf_event__process_comm,
        .ordered_samples        = true,
};

static int read_events(void)
{
        session = perf_session__new(input_name, O_RDONLY, 0, false, &eops);
        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_report(void)
{
        setup_pager();
        select_key();
        read_events();
        sort_result();
        print_result();
}

static const char * const report_usage[] = {
        "perf lock report [<options>]",
        NULL
};

static const struct option report_options[] = {
        OPT_STRING('k', "key", &sort_key, "acquired",
                    "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"),
        /* TODO: type */
        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
};

static 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_END()
};

static const char *record_args[] = {
        "record",
        "-R",
        "-f",
        "-m", "1024",
        "-c", "1",
        "-e", "lock:lock_acquire",
        "-e", "lock:lock_acquired",
        "-e", "lock:lock_contended",
        "-e", "lock:lock_release",
};

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 *));

        if (rec_argv == NULL)
                return -ENOMEM;

        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], "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);
                }
                __cmd_report();
        } else if (!strcmp(argv[0], "script")) {
                /* Aliased to 'perf script' */
                return cmd_script(argc, argv, prefix);
        } 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_info();
        } else {
                usage_with_options(lock_usage, lock_options);
        }

        return 0;
}