kernel.git/include/trace/events/rcu.h, branch linux-3.16.y

rcu: Avoid sparse warnings in rcu_nocb_wake trace event

2013-09-23T16:18:17Z

The event-tracing macros do not like bool tracing arguments, so this commit makes them be of type char. This change has the knock-on effect of making it illegal to pass a pointer into one of these arguments, so also change rcutiny's first call to trace_rcu_batch_end() to convert from pointer to boolean, prefixing with "!!". Reported-by: kbuild test robot Signed-off-by: Paul E. McKenney

rcu: Track rcu_nocb_kthread()'s sleeping and awakening

2013-09-23T16:18:16Z

This commit adds event traces to track all of rcu_nocb_kthread()'s blocking and awakening. Signed-off-by: Paul E. McKenney

rcu: Add tracing for rcuo no-CBs CPU wakeup handshake

2013-09-23T16:18:13Z

Lost wakeups from call_rcu() to the rcuo kthreads can result in hangs that are difficult to diagnose. This commit therefore adds tracing to help pin down the cause of these hangs. Reported-by: Clark Williams Reported-by: Carsten Emde Signed-off-by: Paul E. McKenney [ paulmck: Add const per kbuild test robot's advice. ]

rcu: Add tracing of normal (non-NOCB) grace-period requests

2013-09-23T16:18:08Z

This commit adds tracing to the normal grace-period request points. These are rcu_gp_cleanup(), which checks for the need for another grace period at the end of the previous grace period, and rcu_start_gp_advanced(), which restarts RCU's state machine after an idle period. These trace events are intended to help track down bugs where RCU remains idle despite there being work for it to do. Reported-by: Clark Williams Signed-off-by: Paul E. McKenney

rcu: Add tracing to rcu_gp_kthread()

2013-09-23T16:16:14Z

This commit adds tracing to the rcu_gp_kthread() function in order to help trace down hangs potentially involving this kthread. Reported-by: Clark Williams Reported-by: Carsten Emde Signed-off-by: Paul E. McKenney

rcu: Add const annotation to char * for RCU tracepoints and functions

2013-07-29T21:07:49Z

All the RCU tracepoints and functions that reference char pointers do so with just 'char *' even though they do not modify the contents of the string itself. This will cause warnings if a const char * is used in one of these functions. The RCU tracepoints store the pointer to the string to refer back to them when the trace output is displayed. As this can be minutes, hours or even days later, those strings had better be constant. This change also opens the door to allow the RCU tracepoint strings and their addresses to be exported so that userspace tracing tools can translate the contents of the pointers of the RCU tracepoints. Signed-off-by: Steven Rostedt

rcu: Repurpose no-CBs event tracing to future-GP events

2013-03-26T15:04:54Z

Dyntick-idle CPUs need to be able to pre-announce their need for grace periods. This can be done using something similar to the mechanism used by no-CB CPUs to announce their need for grace periods. This commit moves in this direction by renaming the no-CBs grace-period event tracing to suit the new future-grace-period needs. Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney

rcu: Add event tracing for no-CBs CPUs' grace periods

2013-03-26T15:04:46Z

Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-29T06:25:21Z

doctorture.2013.01.11a: Changes to rcutorture and to RCU documentation. fixes.2013.01.26a: Miscellaneous fixes. tagcb.2013.01.24a: Tag RCU callbacks with grace-period number to simplify callback advancement. tiny.2013.01.29b: Enhancements to uniprocessor handling in tiny RCU.

rcu: Trace callback acceleration

2013-01-08T22:15:57Z

This commit adds event tracing for callback acceleration to allow better tracking of callbacks through the system. Signed-off-by: Paul E. McKenney