rcu: Reduce synchronize_rcu_expedited() latency

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The synchronize_rcu_expedited() function disables interrupts across a
scan of all leaf rcu_node structures, which is not good for real-time
scheduling latency on large systems (hundreds or especially thousands
of CPUs).  This commit therefore holds off CPU-hotplug operations using
get_online_cpus(), and removes the prior acquisiion of the ->onofflock
(which required disabling interrupts).

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 2012-07-30 17:19:25 -07:00

parent bcfa57ce10

commit 1943c89de7

1 changed files with 22 additions and 8 deletions

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kernel/rcutree_plugin.h

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