linux/kernel/rcutorture.c, branch v2.6.19

[PATCH] rcu: add sched torture type to rcutorture

2006-10-04T14:55:31Z

Implement torture testing for the "sched" variant of RCU, which uses preempt_disable, preempt_enable, and synchronize_sched. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: add rcu_bh_sync torture type to rcutorture

2006-10-04T14:55:31Z

Use the newly-generic synchronous deferred free function to implement torture testing for rcu_bh using synchronize_rcu_bh rather than the asynchronous call_rcu_bh. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: add rcu_sync torture type to rcutorture

2006-10-04T14:55:31Z

Use the newly-generic synchronous deferred free function to implement torture testing for RCU using synchronize_rcu rather than the asynchronous call_rcu. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: refactor srcu_torture_deferred_free to work for any implementation

2006-10-04T14:55:31Z

Make srcu_torture_deferred_free use cur_ops->sync() so it will work for any implementation. Move and rename it in preparation for use in the ops of other implementations. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] RCU: add fake writers to rcutorture

2006-10-04T14:55:31Z

rcutorture currently has one writer and an arbitrary number of readers. To better exercise some of the code paths in RCU implementations, add fake writer threads which call the synchronize function for the RCU variant in a loop, with a delay between calls to arrange for different numbers of writers running in parallel. [bunk@stusta.de: cleanup] Acked-by: Paul McKenney Cc: Dipkanar Sarma Signed-off-by: Josh Triplett Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: Fix sign bug making rcu_random always return the same sequence

2006-10-04T14:55:31Z

rcu_random uses a counter rrs_count to occasionally mix data from get_random_bytes into the state of its pseudorandom generator. However, the rrs_counter gets declared as an unsigned long, and rcu_random checks for --rrs_count < 0, so this code will never mix any real random data into the state, and will thus always return the same sequence of random numbers. Also, change the return value of rcu_random from long to unsigned long, to avoid potential issues caused by the use of the % operator, which can return negative values for negative left operands. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: Avoid kthread_stop on invalid pointer if rcutorture reader startup fails

2006-10-04T14:55:30Z

rcu_torture_init kmallocs the array of reader threads, then creates each one with kthread_run, cleaning up with rcu_torture_cleanup if this fails. rcu_torture_cleanup calls kthread_stop on any non-NULL pointer in the array; however, any readers after the one that failed to start up will have invalid pointers, not null pointers. Avoid this by using kzalloc instead. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: Mention rcu_bh in description of rcutorture's torture_type parameter

2006-10-04T14:55:30Z

The comment for rcutorture's torture_type parameter only lists the RCU variants rcu and srcu, but not rcu_bh; add rcu_bh to the list. Signed-off-by: Josh Triplett Acked-by: Paul E. McKenney Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] rcu: Add MODULE_AUTHOR to rcutorture module

2006-10-04T14:55:30Z

Signed-off-by: Josh Triplett Acked-by: "Paul E. McKenney" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] srcu-3: add SRCU operations to rcutorture

2006-10-04T14:55:30Z

Adds SRCU operations to rcutorture and updates rcutorture documentation. Also increases the stress imposed by the rcutorture test. [bunk@stusta.de: make needlessly global code static] Signed-off-by: Paul E. McKenney Cc: Paul E. McKenney Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds