kernel.git/kernel/rcu/rcutorture.c, branch linux-3.19.y

rcutorture: Fix rcu_torture_cbflood() memory leak

2014-11-04T03:26:41Z

Commit 38706bc5a29a (rcutorture: Add callback-flood test) vmalloc()ed a bunch of RCU callbacks, but failed to free them. This commit fixes that oversight. Signed-off-by: Paul E. McKenney Reviewed-by: Pranith Kumar

rcutorture: Rename rcutorture_runnable parameter

2014-09-16T20:41:44Z

This commit changes rcutorture_runnable to torture_runnable, which is consistent with the names of the other parameters and is a bit shorter as well. Signed-off-by: Paul E. McKenney

torture: Address race in module cleanup

2014-09-16T20:41:06Z

When performing module cleanups by calling torture_cleanup() the 'torture_type' string in nullified However, callers are not necessarily done, and might still need to reference the variable. This impacts both rcutorture and locktorture, causing printing things like: [ 94.226618] (null)-torture: Stopping lock_torture_writer task [ 94.226624] (null)-torture: Stopping lock_torture_stats task Thus delay this operation until the very end of the cleanup process. The consequence (which shouldn't matter for this kid of program) is, of course, that we delay the window between rmmod and modprobing, for instance in module_torture_begin(). Signed-off-by: Davidlohr Bueso Signed-off-by: Paul E. McKenney

Merge branch 'rcu-tasks.2014.09.10a' into HEAD

2014-09-16T17:10:44Z

rcu-tasks.2014.09.10a: Add RCU-tasks flavor of RCU.

rcutorture: Add torture tests for RCU-tasks

2014-09-07T23:27:24Z

This commit adds torture tests for RCU-tasks. It also fixes a bug that would segfault for an RCU flavor lacking a callback-barrier function. Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett

rcu: Provide cond_resched_rcu_qs() to force quiescent states in long loops

2014-09-07T23:27:20Z

RCU-tasks requires the occasional voluntary context switch from CPU-bound in-kernel tasks. In some cases, this requires instrumenting cond_resched(). However, there is some reluctance to countenance unconditionally instrumenting cond_resched() (see http://lwn.net/Articles/603252/), so this commit creates a separate cond_resched_rcu_qs() that may be used in place of cond_resched() in locations prone to long-duration in-kernel looping. This commit currently instruments only RCU-tasks. Future possibilities include also instrumenting RCU, RCU-bh, and RCU-sched in order to reduce IPI usage. Signed-off-by: Paul E. McKenney

rcutorture: Add callback-flood test

2014-09-07T23:24:48Z

Although RCU is designed to handle arbitrary floods of callbacks, this capability is not routinely tested. This commit therefore adds a cbflood capability in which kthreads repeatedly registers large numbers of callbacks. One such kthread is created for each four CPUs (rounding up), and the test may be controlled by several cbflood_* kernel boot parameters, which control the number of bursts per flood, the number of callbacks per burst, the time between bursts, and the time between floods. The default values are large enough to exercise RCU's emergency responses to callback flooding. Signed-off-by: Paul E. McKenney Cc: David Miller Reviewed-by: Pranith Kumar

rcu: Use pr_alert/pr_cont for printing logs

2014-09-07T23:24:47Z

User pr_alert/pr_cont for printing the logs from rcutorture module directly instead of writing it to a buffer and then printing it. This allows us from not having to allocate such buffers. Also remove a resulting empty function. I tested this using the parse-torture.sh script as follows: $ dmesg | grep torture > log.txt $ bash parse-torture.sh log.txt test $ There were no warnings which means that parsing went fine. Signed-off-by: Joe Perches Signed-off-by: Pranith Kumar Signed-off-by: Paul E. McKenney

rcutorture: Fix a sparse warning by marking boost_mutex static

2014-09-07T23:24:17Z

This commit fixes the following sparse warning by marking boost_mutex static: kernel/rcu/rcutorture.c:185:1: warning: symbol 'boost_mutex' was not declared. Should it be static? Signed-off-by: Pranith Kumar Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett

Josh has moved

2014-07-31T00:16:13Z

My IBM email addresses haven't worked for years; also map some old-but-functional forwarding addresses to my canonical address. Update my GPG key fingerprint; I moved to 4096R a long time ago. Update description. Signed-off-by: Josh Triplett Cc: "Paul E. McKenney" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds