rcu: Create call_rcu_tasks() kthread at boot time

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Currently the call_rcu_tasks() kthread is created upon first
invocation of call_rcu_tasks().  This has the advantage of avoiding
creation if there are never any invocations of call_rcu_tasks() and of
synchronize_rcu_tasks(), but it requires an unreliable heuristic to
determine when it is safe to create the kthread.  For example, it is
not safe to create the kthread when call_rcu_tasks() is invoked with
a spinlock held, but there is no good way to detect this in !PREEMPT
kernels.

This commit therefore creates this kthread unconditionally at
core_initcall() time.  If you don't want this kthread created, then
build with CONFIG_TASKS_RCU=n.

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

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This commit is contained in:

Paul E. McKenney 2017-08-11 12:37:07 -07:00

parent 135bd1a230

commit c63eb17ff0

1 changed files with 5 additions and 19 deletions

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24

kernel/rcu/update.c

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