Commit 797b82eb authored by Waiman Long's avatar Waiman Long Committed by Ingo Molnar
Browse files

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: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200206152408.24165-6-longman@redhat.com
parent 836bd74b

kernel/locking/lockdep.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -2626,6 +2626,7 @@ out_bug: 
struct lock_chain lock_chains[MAX_LOCKDEP_CHAINS];

struct lock_chain lock_chains[MAX_LOCKDEP_CHAINS];

static DECLARE_BITMAP(lock_chains_in_use, MAX_LOCKDEP_CHAINS);

static DECLARE_BITMAP(lock_chains_in_use, MAX_LOCKDEP_CHAINS);

static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS];

static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS];

unsigned long nr_zapped_lock_chains;

unsigned int nr_chain_hlocks;

unsigned int nr_chain_hlocks;





struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i)

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);

	hlist_del_rcu(&chain->entry);

	__set_bit(chain - lock_chains, pf->lock_chains_being_freed);

	__set_bit(chain - lock_chains, pf->lock_chains_being_freed);

	nr_zapped_lock_chains++;

#endif

#endif

}

}

kernel/locking/lockdep_internals.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -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_lock_classes;

extern unsigned long nr_zapped_classes;

extern unsigned long nr_zapped_classes;

extern unsigned long nr_zapped_lock_chains;

extern unsigned long nr_list_entries;

extern unsigned long nr_list_entries;

long lockdep_next_lockchain(long i);

long lockdep_next_lockchain(long i);

unsigned long lock_chain_count(void);

unsigned long lock_chain_count(void);

kernel/locking/lockdep_proc.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -349,6 +349,10 @@ static int lockdep_stats_show(struct seq_file *m, void *v) 
	seq_puts(m, "\n");

	seq_puts(m, "\n");

	seq_printf(m, " zapped classes:                %11lu\n",

	seq_printf(m, " zapped classes:                %11lu\n",

			nr_zapped_classes);

			nr_zapped_classes);

#ifdef CONFIG_PROVE_LOCKING

	seq_printf(m, " zapped lock chains:            %11lu\n",

			nr_zapped_lock_chains);

#endif

	return 0;

	return 0;

}

}

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