rcu: Avoid redundant grace-period kthread wakeups

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When setting up an in-the-future "advanced" grace period, the code needs
to wake up the relevant grace-period kthread, which it currently does
unconditionally.  However, this results in needless wakeups in the case
where the advanced grace period is being set up by the grace-period
kthread itself, which is a non-uncommon situation.  This commit therefore
checks to see if the running thread is the grace-period kthread, and
avoids doing the irq_work_queue()-mediated wakeup in that case.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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Paul E. McKenney 2013-06-20 13:50:40 -07:00

parent ae15018456

commit 1eafd31c64

1 changed files with 5 additions and 3 deletions

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kernel/rcutree.c

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