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Date: Wed, 15 Jan 2020 16:43:10 -0500 From: Waiman Long <longman@...hat.com> To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com> Cc: linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>, Waiman Long <longman@...hat.com> Subject: [PATCH v3 5/8] 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@...hat.com> --- kernel/locking/lockdep.c | 2 ++ kernel/locking/lockdep_internals.h | 1 + kernel/locking/lockdep_proc.c | 2 ++ 3 files changed, 5 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 436fcaa4d5d5..10471167b5f7 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2637,6 +2637,7 @@ check_prevs_add(struct task_struct *curr, struct held_lock *next) 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) @@ -4808,6 +4809,7 @@ static void remove_class_from_lock_chain(struct pending_free *pf, */ 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 42a1e55f49a7..b013250f2ca1 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 2457bc97924c..df1b97912871 100644 --- a/kernel/locking/lockdep_proc.c +++ b/kernel/locking/lockdep_proc.c @@ -349,6 +349,8 @@ 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); + seq_printf(m, " zapped lock chains: %11lu\n", + nr_zapped_lock_chains); return 0; } -- 2.18.1
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