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From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org,
	Bart Van Assche <bvanassche@acm.org>,
	Waiman Long <longman@redhat.com>
Subject: [PATCH v5 5/7] locking/lockdep: Track number of zapped lock chains
Date: Mon,  3 Feb 2020 11:41:45 -0500	[thread overview]
Message-ID: <20200203164147.17990-6-longman@redhat.com> (raw)
In-Reply-To: <20200203164147.17990-1-longman@redhat.com>

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>
---
 kernel/locking/lockdep.c           | 2 ++
 kernel/locking/lockdep_internals.h | 1 +
 kernel/locking/lockdep_proc.c      | 4 ++++
 3 files changed, 7 insertions(+)

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 @@ 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)
@@ -4797,6 +4798,7 @@ 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 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 ca735cb83f48..92fe0742453c 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;
 }
 
-- 
2.18.1


  parent reply	other threads:[~2020-02-03 16:42 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-03 16:41 [PATCH v5 0/7] locking/lockdep: Reuse zapped chain_hlocks entries Waiman Long
2020-02-03 16:41 ` [PATCH v5 1/7] locking/lockdep: Decrement irq context counters when removing lock chain Waiman Long
2020-02-03 16:41 ` [PATCH v5 2/7] locking/lockdep: Display irq_context names in /proc/lockdep_chains Waiman Long
2020-02-03 16:41 ` [PATCH v5 3/7] locking/lockdep: Track number of zapped classes Waiman Long
2020-02-03 16:41 ` [PATCH v5 4/7] locking/lockdep: Throw away all lock chains with zapped class Waiman Long
2020-02-03 16:41 ` Waiman Long [this message]
2020-02-03 16:41 ` [PATCH v5 6/7] locking/lockdep: Reuse freed chain_hlocks entries Waiman Long
2020-02-04 12:36   ` Peter Zijlstra
2020-02-04 14:54     ` Waiman Long
2020-02-04 16:45     ` Waiman Long
2020-02-05  9:41       ` Peter Zijlstra
2020-02-05 13:59         ` Waiman Long
2020-02-04 15:42   ` Peter Zijlstra
2020-02-04 16:12     ` Waiman Long
2020-02-04 16:26       ` Waiman Long
2020-02-04 16:57         ` Waiman Long
2020-02-05  9:48           ` Peter Zijlstra
2020-02-05 14:03             ` Waiman Long
2020-02-03 16:41 ` [PATCH v5 7/7] locking/lockdep: Add a fast path for chain_hlocks allocation Waiman Long
2020-02-04 12:47   ` Peter Zijlstra
2020-02-04 15:07     ` Waiman Long
2020-02-04 13:18   ` Peter Zijlstra
2020-02-04 13:44     ` Peter Zijlstra
2020-02-04 18:02       ` Waiman Long

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