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locktorture: Support rwlocks

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Add a "rw_lock" torture test to stress kernel rwlocks and their irq
variant. Reader critical regions are 5x longer than writers. As such
a similar ratio of lock acquisitions is seen in the statistics. In the
case of massive contention, both hold the lock for 1/10 of a second.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Davidlohr Bueso 2014-09-29 06:14:23 -07:00 • committed by Paul E. McKenney
parent dd56af42bd
commit e34191fad8
5 changed files with 125 additions and 3 deletions
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5
Documentation/locking/locktorture.txt
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@ -45,6 +45,11 @@ torture_type Type of lock to torture. By default, only spinlocks will
o "spin_lock_irq": spin_lock_irq() and spin_unlock_irq()
pairs.
o "rw_lock": read/write lock() and unlock() rwlock pairs.
o "rw_lock_irq": read/write lock_irq() and unlock_irq()
rwlock pairs.
o "mutex_lock": mutex_lock() and mutex_unlock() pairs.
o "rwsem_lock": read/write down() and up() semaphore pairs.