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authorJason Baron <jbaron@redhat.com>2007-02-10 01:44:59 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:26 -0800
commit068135e63518314d4efd711142f674ad0841599e (patch)
treedbf8193b0e8f3b6c0e735b48c1f8201a6df207ac /kernel/lockdep_proc.c
parent381a229209aa6f7f72375797b7bcfcfe2ae6fcbb (diff)
[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>
Diffstat (limited to 'kernel/lockdep_proc.c')
-rw-r--r--kernel/lockdep_proc.c41
1 files changed, 29 insertions, 12 deletions
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index b554b40a4aa..57a547a2da3 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -77,12 +77,29 @@ static unsigned long count_backward_deps(struct lock_class *class)
return ret;
}
+static void print_name(struct seq_file *m, struct lock_class *class)
+{
+ char str[128];
+ const char *name = class->name;
+
+ if (!name) {
+ name = __get_key_name(class->key, str);
+ seq_printf(m, "%s", name);
+ } else{
+ seq_printf(m, "%s", name);
+ if (class->name_version > 1)
+ seq_printf(m, "#%d", class->name_version);
+ if (class->subclass)
+ seq_printf(m, "/%d", class->subclass);
+ }
+}
+
static int l_show(struct seq_file *m, void *v)
{
unsigned long nr_forward_deps, nr_backward_deps;
struct lock_class *class = m->private;
- char str[128], c1, c2, c3, c4;
- const char *name;
+ struct lock_list *entry;
+ char c1, c2, c3, c4;
seq_printf(m, "%p", class->key);
#ifdef CONFIG_DEBUG_LOCKDEP
@@ -97,16 +114,16 @@ static int l_show(struct seq_file *m, void *v)
get_usage_chars(class, &c1, &c2, &c3, &c4);
seq_printf(m, " %c%c%c%c", c1, c2, c3, c4);
- name = class->name;
- if (!name) {
- name = __get_key_name(class->key, str);
- seq_printf(m, ": %s", name);
- } else{
- seq_printf(m, ": %s", name);
- if (class->name_version > 1)
- seq_printf(m, "#%d", class->name_version);
- if (class->subclass)
- seq_printf(m, "/%d", class->subclass);
+ seq_printf(m, ": ");
+ print_name(m, class);
+ seq_puts(m, "\n");
+
+ list_for_each_entry(entry, &class->locks_after, entry) {
+ if (entry->distance == 1) {
+ seq_printf(m, " -> [%p] ", entry->class);
+ print_name(m, entry->class);
+ seq_puts(m, "\n");
+ }
}
seq_puts(m, "\n");