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[PATCH] lockdep: add graph depth information to /proc/lockdep

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Generate locking graph information into /proc/lockdep, for lock hierarchy
documentation and visualization purposes.

sample output:

 c089fd5c OPS:     138 FD:   14 BD:    1 --..: &tty->termios_mutex
  -> [c07a3430] tty_ldisc_lock
  -> [c07a37f0] &port_lock_key
  -> [c07afdc0] &rq->rq_lock_key#2

The lock classes listed are all the first-hop lock dependencies that
lockdep has seen so far.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jason Baron 2007-02-10 01:44:59 -08:00 • committed by Linus Torvalds
parent 381a229209
commit 068135e635
3 changed files with 42 additions and 19 deletions
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1
include/linux/lockdep.h
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@ -132,6 +132,7 @@ struct lock_list {
struct list_head entry;
struct lock_class *class;
struct stack_trace trace;
int distance;
};
/*