linux-kernel - [RFC v2 12/13] lockdep: Make crossrelease use save_stack_trace

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Date:	Thu,  7 Jul 2016 18:30:02 +0900
From:	Byungchul Park <byungchul.park@....com>
To:	peterz@...radead.org, mingo@...nel.org
Cc:	tglx@...utronix.de, npiggin@...nel.dk, walken@...gle.com,
	boqun.feng@...il.com, kirill@...temov.name,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [RFC v2 12/13] lockdep: Make crossrelease use save_stack_trace_norm() instead

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@....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 ea19108..fd7865b 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4690,7 +4690,7 @@ 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_norm(&plock->trace);
 	}
 }
 
-- 
1.9.1