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 v2 3/6] locking/lockdep: Track number of zapped lock chains
Date: Mon, 16 Dec 2019 10:15:14 -0500 [thread overview]
Message-ID: <20191216151517.7060-4-longman@redhat.com> (raw)
In-Reply-To: <20191216151517.7060-1-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 | 2 ++
3 files changed, 5 insertions(+)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 30ebfe4978d5..8293f7e80ee6 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2625,6 +2625,7 @@ 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)
@@ -4793,6 +4794,7 @@ 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 5dec0fe12507..35758e469ff7 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -125,6 +125,7 @@ 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 4c7dc0a8935d..7c15dd03cf49 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -345,6 +345,8 @@ 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
next prev parent reply other threads:[~2019-12-16 15:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 15:15 [PATCH v2 0/6] locking/lockdep: Reuse zapped chain_hlocks entries Waiman Long
2019-12-16 15:15 ` [PATCH v2 1/6] locking/lockdep: Track number of zapped classes Waiman Long
2020-01-13 14:55 ` Peter Zijlstra
2020-01-13 14:58 ` Waiman Long
2020-01-13 16:02 ` Bart Van Assche
2019-12-16 15:15 ` [PATCH v2 2/6] locking/lockdep: Throw away all lock chains with zapped class Waiman Long
2020-01-13 15:18 ` Peter Zijlstra
2020-01-13 15:44 ` Waiman Long
2020-01-13 16:05 ` Bart Van Assche
2020-01-13 16:15 ` Waiman Long
2019-12-16 15:15 ` Waiman Long [this message]
2019-12-16 15:15 ` [PATCH v2 4/6] locking/lockdep: Reuse freed chain_hlocks entries Waiman Long
2020-01-13 15:51 ` Peter Zijlstra
2020-01-13 16:04 ` Waiman Long
2020-01-13 15:58 ` Peter Zijlstra
2020-01-13 16:24 ` Waiman Long
2020-01-14 9:46 ` Peter Zijlstra
2020-01-14 19:16 ` Waiman Long
2020-01-15 10:44 ` Peter Zijlstra
2020-01-15 19:26 ` Waiman Long
2020-01-13 15:59 ` Peter Zijlstra
2020-01-13 16:03 ` Waiman Long
2019-12-16 15:15 ` [PATCH v2 5/6] locking/lockdep: Decrement irq context counters when removing lock chain Waiman Long
2020-01-14 9:53 ` Peter Zijlstra
2020-01-14 15:04 ` Waiman Long
2019-12-16 15:15 ` [PATCH v2 6/6] locking/lockdep: Display irq_context names in /proc/lockdep_chains Waiman Long
2020-01-06 15:54 ` [PATCH v2 0/6] locking/lockdep: Reuse zapped chain_hlocks entries Waiman Long
2020-01-06 16:50 ` Peter Zijlstra
2020-01-06 16:52 ` Waiman Long
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