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    Subject[PATCH 8/8] kernel:lockdep:add statistics info for max bfs queue depth
    Date
    From: Ming Lei <tom.leiming@gmail.com>


    Signed-off-by: Ming Lei <tom.leiming@gmail.com>
    ---
    kernel/lockdep.c | 6 +++++-
    kernel/lockdep_internals.h | 3 ++-
    kernel/lockdep_proc.c | 2 ++
    3 files changed, 9 insertions(+), 2 deletions(-)

    diff --git a/kernel/lockdep.c b/kernel/lockdep.c
    index faa39cb..b20f08b 100644
    --- a/kernel/lockdep.c
    +++ b/kernel/lockdep.c
    @@ -929,7 +929,7 @@ static int add_lock_to_list(struct lock_class *class, struct lock_class *this,

    unsigned long bfs_accessed[BITS_TO_LONGS(MAX_LOCKDEP_ENTRIES)];
    static struct circular_queue lock_cq;
    -
    +unsigned int max_bfs_queue_depth;
    static int __bfs(struct lock_list *source_entry,
    void *data,
    int (*match)(struct lock_list *entry, void *data),
    @@ -975,6 +975,7 @@ static int __bfs(struct lock_list *source_entry,

    list_for_each_entry(entry, head, entry) {
    if (!lock_accessed(entry)) {
    + unsigned int cq_depth;
    mark_lock_accessed(entry, lock);
    if (match(entry, data)) {
    *target_entry = entry;
    @@ -986,6 +987,9 @@ static int __bfs(struct lock_list *source_entry,
    ret = -1;
    goto exit;
    }
    + cq_depth = __cq_get_elem_count(cq);
    + if (max_bfs_queue_depth < cq_depth)
    + max_bfs_queue_depth = cq_depth;
    }
    }
    }
    diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
    index b115aaa..6baa880 100644
    --- a/kernel/lockdep_internals.h
    +++ b/kernel/lockdep_internals.h
    @@ -138,6 +138,7 @@ extern atomic_t nr_find_usage_backwards_recursions;
    #endif


    +extern unsigned int max_bfs_queue_depth;
    extern unsigned long nr_list_entries;
    extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
    extern unsigned long bfs_accessed[];
    @@ -191,7 +192,7 @@ static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
    return 0;
    }

    -static inline int __cq_get_elem_count(struct circular_queue *cq)
    +static inline unsigned int __cq_get_elem_count(struct circular_queue *cq)
    {
    return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1);
    }
    diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
    index d7135aa..9a1bf34 100644
    --- a/kernel/lockdep_proc.c
    +++ b/kernel/lockdep_proc.c
    @@ -411,6 +411,8 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
    max_lockdep_depth);
    seq_printf(m, " max recursion depth: %11u\n",
    max_recursion_depth);
    + seq_printf(m, " max bfs queue depth: %11u\n",
    + max_bfs_queue_depth);
    lockdep_stats_debug_show(m);
    seq_printf(m, " debug_locks: %11u\n",
    debug_locks);
    --
    1.6.0.GIT


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