lockdep: Add statistics info for max bfs queue depth
Add BFS statistics to the existing lockdep stats. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1246201486-7308-10-git-send-email-tom.leiming@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -929,7 +929,7 @@ static int add_lock_to_list(struct lock_class *class, struct lock_class *this,
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unsigned long bfs_accessed[BITS_TO_LONGS(MAX_LOCKDEP_ENTRIES)];
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static struct circular_queue lock_cq;
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unsigned int max_bfs_queue_depth;
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static int __bfs(struct lock_list *source_entry,
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void *data,
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int (*match)(struct lock_list *entry, void *data),
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@ -975,6 +975,7 @@ static int __bfs(struct lock_list *source_entry,
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list_for_each_entry(entry, head, entry) {
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if (!lock_accessed(entry)) {
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unsigned int cq_depth;
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mark_lock_accessed(entry, lock);
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if (match(entry, data)) {
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*target_entry = entry;
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@ -986,6 +987,9 @@ static int __bfs(struct lock_list *source_entry,
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ret = -1;
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goto exit;
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}
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cq_depth = __cq_get_elem_count(cq);
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if (max_bfs_queue_depth < cq_depth)
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max_bfs_queue_depth = cq_depth;
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}
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}
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}
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@ -138,6 +138,7 @@ extern atomic_t nr_find_usage_backwards_recursions;
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#endif
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extern unsigned int max_bfs_queue_depth;
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extern unsigned long nr_list_entries;
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extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
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extern unsigned long bfs_accessed[];
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@ -191,7 +192,7 @@ static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
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return 0;
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}
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static inline int __cq_get_elem_count(struct circular_queue *cq)
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static inline unsigned int __cq_get_elem_count(struct circular_queue *cq)
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{
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return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1);
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}
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@ -411,6 +411,8 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
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max_lockdep_depth);
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seq_printf(m, " max recursion depth: %11u\n",
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max_recursion_depth);
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seq_printf(m, " max bfs queue depth: %11u\n",
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max_bfs_queue_depth);
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lockdep_stats_debug_show(m);
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seq_printf(m, " debug_locks: %11u\n",
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debug_locks);
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