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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
This commit is contained in:
Waiman Long 2020-02-06 10:24:07 -05:00 committed by Ingo Molnar
parent 836bd74b59
commit 797b82eb90
3 changed files with 7 additions and 0 deletions
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2
kernel/locking/lockdep.c
View File

@ -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
}

1
kernel/locking/lockdep_internals.h
View File

@ -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);

4
kernel/locking/lockdep_proc.c
View File

@ -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;
}