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Subject[tip:core/locking] lockdep: Always try to set ->class_cache in register_lock_class() lockdep_init_map()
Commit-ID:  87cdee71166fa107c5dc8e43060eeefa533c6a3b
Gitweb: http://git.kernel.org/tip/87cdee71166fa107c5dc8e43060eeefa533c6a3b
Author: Yong Zhang <yong.zhang0@gmail.com>
AuthorDate: Wed, 9 Nov 2011 16:07:14 +0800
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 14 Nov 2011 13:54:11 +0100

lockdep: Always try to set ->class_cache in register_lock_class() lockdep_init_map()

Commit ["62016250 lockdep: Add improved subclass caching"] tries to
improve performance (expecially to reduce the cost of rq->lock)
when using lockdep, but it fails due to lockdep_init_map() in
which ->class_cache is cleared. The typical caller is
lock_set_subclass(), after that class will not be cached anymore.

This patch tries to achive the goal of commit 62016250 by always
setting ->class_cache in register_lock_class().

=== Score comparison of benchmarks ===

for i in `seq 1 10`; do ./perf bench -f simple sched messaging; done

before: min: 0.604, max: 0.660, avg: 0.622
after: min: 0.414, max: 0.473, avg: 0.427

for i in `seq 1 10`; do ./perf bench -f simple sched messaging -g 40; done

before: min: 2.347, max: 2.421, avg: 2.391
after: min: 1.652, max: 1.699, avg: 1.671

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20111109080714.GC8124@zhy
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/lockdep.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e69434b..103bed8 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -722,7 +722,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)

class = look_up_lock_class(lock, subclass);
if (likely(class))
- return class;
+ goto out_set_class_cache;

/*
* Debug-check: all keys must be persistent!
@@ -807,6 +807,7 @@ out_unlock_set:
graph_unlock();
raw_local_irq_restore(flags);

+out_set_class_cache:
if (!subclass || force)
lock->class_cache[0] = class;
else if (subclass < NR_LOCKDEP_CACHING_CLASSES)

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