rcu-tasks: Add block comment laying out RCU Tasks Trace design

This commit adds a block comment that gives a high-level overview of
how RCU tasks trace grace periods progress.  It also adds a note about
how exiting tasks are handled, plus it gives an overview of the memory
ordering.

Reported-by: Peter Zijlstra <[email protected]>
Reported-by: Mathieu Desnoyers <[email protected]>
[ paulmck: Fix commit log per Mathieu Desnoyers feedback. ]
Signed-off-by: Paul E. McKenney <[email protected]>

0 files changed, 0 insertions, 0 deletions