linux.git/Documentation/RCU/Design, branch v4.8

documentation: Add RCU_NONIDLE() restrictions to requirements

2016-06-14T23:00:59+00:00

Signed-off-by: Paul E. McKenney

documentation: Add documentation for RCU's major data structures

2016-04-19T21:48:12+00:00

This commit adds documentation for RCU's major data structures,
including rcu_state, rcu_node, rcu_data, rcu_dynticks, and rcu_head.

Signed-off-by: Paul E. McKenney

documentation: Emphasize the call_rcu() is illegal from idle

2016-03-31T20:33:23+00:00

Although call_rcu()'s fastpath works just fine on an idle CPU,
some branches of the slowpath invoke the scheduler, which uses
RCU.  Therefore, this commit emphasizes the fact that call_rcu()
must not be invoked from an idle CPU.

Signed-off-by: Paul E. McKenney

documentation: Sharpen up the no-readers quick quiz

2016-03-31T20:33:23+00:00

Signed-off-by: Paul E. McKenney

documentation: Get rid of duplicate .htmlx file

2016-03-31T20:33:22+00:00

This commit uses colors to obscure the quick-quiz answers, thus getting
rid of the .htmlx file.  Use your mouse to select the answer in order
to see the text.  Alternatively, use your favorite scripting language
to remove all occurences of "" from the file.

Reported-by: Linus Torvalds 
Signed-off-by: Paul E. McKenney

documentation: Remove unnecessary images from requirements

2016-03-31T20:33:21+00:00

This commit removes a cutesy cartoon and also a diagram that can
just as easily be represented by text.

Reported-by: Linus Torvalds 
Signed-off-by: Paul E. McKenney

documentation: Document illegality of call_rcu() from offline CPUs

2016-03-31T20:33:21+00:00

There is already a blanket statement about no member of RCU's API
being legal from an offline CPU, but add an explicit note where it
states that it is illegal to invoke call_rcu() from an NMI handler.

Signed-off-by: Paul E. McKenney

documentation: Explain why rcu_read_lock() needs no barrier()

2016-03-31T20:33:20+00:00

This commit adds a Quick Quiz whose answer explains why the compiler
code reordering enabled by CONFIG_PREEMPT=n's empty rcu_read_lock()
and rcu_read_unlock() functions does not hinder RCU's ability to figure
out which RCU read-side critical sections have completed and not.

Signed-off-by: Paul E. McKenney

documentation: Add synchronize_rcu_mult() to the requirements

2016-03-31T20:33:20+00:00

Signed-off-by: Paul E. McKenney

documentation: Add real-time requirements from CPU-bound workloads

2016-03-31T20:33:19+00:00

This commit records RCU's responsibility to avoid degrading latencies
of CPUs running tight loops within properly configured workloads,
both in kernel and in userspace.

Signed-off-by: Paul E. McKenney