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| author | Ming Lei <tom.leiming@gmail.com> | 2009-07-16 15:44:29 +0200 |
|---|---|---|
| committer | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-07-24 10:52:03 +0200 |
| commit | 12f3dfd022d7e616757a94f0538d3d525d806a16 (patch) | |
| tree | 22221bcfa6edcc47094bd87862eb9cc5402a5799 /kernel/lockdep.c | |
| parent | 4dd861d6467007681991d8ec079d928db2018cbb (diff) | |
| download | lwn-12f3dfd022d7e616757a94f0538d3d525d806a16.tar.gz lwn-12f3dfd022d7e616757a94f0538d3d525d806a16.zip | |
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>
Diffstat (limited to 'kernel/lockdep.c')
| -rw-r--r-- | kernel/lockdep.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 6358cf7e84b2..744da6265d99 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; } } } |