rcu: Accelerate callbacks for CPU initiating a grace period

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Because grace-period initialization is carried out by a separate
kthread, it might happen on a different CPU than the one that
had the callback needing a grace period -- which is where the
callback acceleration needs to happen.

Fortunately, rcu_start_gp() holds the root rcu_node structure's
->lock, which prevents a new grace period from starting.  This
allows this function to safely determine that a grace period has
not yet started, which in turn allows it to fully accelerate any
callbacks that it has pending.  This commit adds this acceleration.

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

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Paul E. McKenney 2012-09-20 16:02:49 -07:00

parent 6f0c0580b7

commit 62da192129

1 changed files with 24 additions and 2 deletions

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kernel/rcutree.c

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