[PATCH v4 08/15] lockdep: Make crossrelease use save_stack_trace_fast()

Byungchul Park
2016-12-09T05:18:17Z

Currently crossrelease feature uses save_stack_trace() to save
backtrace. However, it has much overhead. So this patch makes it
use save_stack_trace_norm() instead, which has smaller overhead.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
---
kernel/locking/lockdep.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 2c8b2c1..fbd07ee 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4768,7 +4768,7 @@ static void add_plock(struct held_lock *hlock, unsigned int prev_gen_id,
plock->trace.max_entries = MAX_PLOCK_TRACE_ENTRIES;
plock->trace.entries = plock->trace_entries;
plock->trace.skip = 3;
- save_stack_trace(&plock->trace);
+ save_stack_trace_fast(&plock->trace);
}
}

--
1.9.1