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Commit 12f3dfd0 authored by Ming Lei's avatar Ming Lei Committed by Peter Zijlstra
Browse files

lockdep: Add statistics info for max bfs queue depth 



Add BFS statistics to the existing lockdep stats.

Signed-off-by: default avatarMing Lei <tom.leiming@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1246201486-7308-10-git-send-email-tom.leiming@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 4dd861d6

kernel/lockdep.c

+5 −1
Original line number Diff line number Diff line
@@ -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;

			}

		}

	}

kernel/lockdep_internals.h

+2 −1
Original line number Diff line number Diff line
@@ -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);

}

kernel/lockdep_proc.c

+2 −0
Original line number Diff line number Diff line
@@ -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);