[PATCH] lockdep: add graph depth information to /proc/lockdep
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>
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index ea097dd..7e1160d 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -132,6 +132,7 @@
struct list_head entry;
struct lock_class *class;
struct stack_trace trace;
+ int distance;
};
/*