tree b48bf8e59c6f99bb20b637aec040f008e926b21e
parent 7a968bb26a9b09b6e44c48a8036a73e0bc497dbc
author Paul E. McKenney <paulmck@linux.ibm.com> 1546983686 -0800
committer Paul E. McKenney <paulmck@linux.ibm.com> 1548459429 -0800

rcutorture: Record grace periods in forward-progress histogram

This commit records grace periods in rcutorture's n_launders_hist[]
histogram, thus allowing rcu_torture_fwd_cb_hist() to print out the
elapsed number of grace periods between buckets.  This information
helps to determine whether a lack of forward progress is due to stalled
grace periods on the one hand or due to sluggish callback invocation on
the other.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>