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Paul E. McKenney bf1bef50be rcutorture: Emphasize testing of single reader protection type
For RCU implementations supporting multiple types of reader protection,
rcutorture currently randomly selects the combinations of types of
protection for each phase of each reader.  The problem with this,
for example, given the four kinds of protection for RCU-sched
(local_irq_disable(), local_bh_disable(), preempt_disable(), and
rcu_read_lock_sched()), the reader will be protected by a single
mechanism only 25% of the time.  We really heavier testing of single
read-side mechanisms.

This commit therefore uses only a single mechanism about 60% of the time,
half of the time explicitly and one-eighth of the time by chance.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
History 2018-07-12 15:42:05 -07:00
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Linux kernel
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