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Groups > linux.kernel > #1438455

[RFC v2 12/13] lockdep: Make crossrelease use save_stack_trace_norm() instead

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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 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

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[RFC v2 00/13] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 01/13] lockdep: Refactor lookup_chain_cache() Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 07/13] pagemap.h: Remove trailing white space Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 09/13] cifs/file.c: Remove trailing white space Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 02/13] lockdep: Add a function building a chain between two hlocks Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 12/13] lockdep: Make crossrelease use save_stack_trace_norm() instead Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 11/13] lockdep: Call lock_acquire(release) when accessing PG_locked manually Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 08/13] lockdep: Apply crossrelease to PG_locked lock Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 04/13] lockdep: Make save_trace can copy from other stack_trace Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  [RFC v2 06/13] lockdep: Apply crossrelease to completion Byungchul Park <byungchul.park@lge.com> - 2016-07-07 11:40 +0200
  Re: [RFC v2 00/13] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-07-07 12:20 +0200

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