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authorWaiman Long <longman@redhat.com>2020-02-06 10:24:07 -0500
committerIngo Molnar <mingo@kernel.org>2020-02-11 13:10:51 +0100
commit797b82eb906eeba24dcd6e9ab92faef01fc684cb (patch)
treeb27a8f62357cc70217b633ec3fde24d4f492ddf2 /kernel/locking
parent836bd74b5957779171c9648e9e29145fc089fffe (diff)
locking/lockdep: Track number of zapped lock chains
Add a new counter nr_zapped_lock_chains to track the number lock chains that have been removed. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20200206152408.24165-6-longman@redhat.com
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/lockdep.c2
-rw-r--r--kernel/locking/lockdep_internals.h1
-rw-r--r--kernel/locking/lockdep_proc.c4
3 files changed, 7 insertions, 0 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index ef2a6432dd10..a63976c75253 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2626,6 +2626,7 @@ out_bug:
struct lock_chain lock_chains[MAX_LOCKDEP_CHAINS];
static DECLARE_BITMAP(lock_chains_in_use, MAX_LOCKDEP_CHAINS);
static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS];
+unsigned long nr_zapped_lock_chains;
unsigned int nr_chain_hlocks;
struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i)
@@ -4797,6 +4798,7 @@ free_lock_chain:
*/
hlist_del_rcu(&chain->entry);
__set_bit(chain - lock_chains, pf->lock_chains_being_freed);
+ nr_zapped_lock_chains++;
#endif
}
diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
index 926bfa4b4564..af722ceeda33 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -131,6 +131,7 @@ struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
extern unsigned long nr_lock_classes;
extern unsigned long nr_zapped_classes;
+extern unsigned long nr_zapped_lock_chains;
extern unsigned long nr_list_entries;
long lockdep_next_lockchain(long i);
unsigned long lock_chain_count(void);
diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 53c2a2ab4f07..524580db4779 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -349,6 +349,10 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
seq_puts(m, "\n");
seq_printf(m, " zapped classes: %11lu\n",
nr_zapped_classes);
+#ifdef CONFIG_PROVE_LOCKING
+ seq_printf(m, " zapped lock chains: %11lu\n",
+ nr_zapped_lock_chains);
+#endif
return 0;
}