diff options
| author |   Waiman Long <longman@redhat.com> | 2020-02-06 10:24:05 -0500 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-02-11 13:10:49 +0100 |
| commit | 1d44bcb4fdb650b2a57c9ff593a4d246a10ad801 (patch) | |
| tree | 70c71d94edb4c03863c5679c659a6eed69170f3e /kernel/locking/lockdep_proc.c | |
| parent | locking/lockdep: Display irq_context names in /proc/lockdep_chains (diff) | |
| download | wireguard-linux-1d44bcb4fdb650b2a57c9ff593a4d246a10ad801.tar.xz wireguard-linux-1d44bcb4fdb650b2a57c9ff593a4d246a10ad801.zip | |
locking/lockdep: Track number of zapped classes
The whole point of the lockdep dynamic key patch is to allow unused
locks to be removed from the lockdep data buffers so that existing
buffer space can be reused. However, there is no way to find out how
many unused locks are zapped and so we don't know if the zapping process
is working properly.
Add a new nr_zapped_classes counter to track that and show it in
/proc/lockdep_stats.
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/20200206152408.24165-4-longman@redhat.com
Diffstat (limited to 'kernel/locking/lockdep_proc.c')
| -rw-r--r-- | kernel/locking/lockdep_proc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c index c2224381c149..99e2f3f6adca 100644 --- a/kernel/locking/lockdep_proc.c +++ b/kernel/locking/lockdep_proc.c @@ -343,6 +343,12 @@ static int lockdep_stats_show(struct seq_file *m, void *v) seq_printf(m, " debug_locks: %11u\n", debug_locks); + /* + * Zappped classes and lockdep data buffers reuse statistics. + */ + seq_puts(m, "\n"); + seq_printf(m, " zapped classes: %11lu\n", + nr_zapped_classes); return 0; } |