rcu: Move quiescent-state forcing into kthread

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As the first step towards allowing quiescent-state forcing to be
preemptible, this commit moves RCU quiescent-state forcing into the
same kthread that is now used to initialize and clean up after grace
periods.  This is yet another step towards keeping scheduling
latency down to a dull roar.

Updated to change from raw_spin_lock_irqsave() to raw_spin_lock_irq()
and to remove the now-unused rcu_state structure fields as suggested by
Peter Zijlstra.

Reported-by: Mike Galbraith <mgalbraith@suse.de>
Reported-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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This commit is contained in:

Paul E. McKenney 2012-06-22 17:06:26 -07:00

parent b402b73b3a

commit 4cdfc175c2

3 changed files with 82 additions and 138 deletions

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199

kernel/rcutree.c

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13

kernel/rcutree.h

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8

kernel/rcutree_plugin.h

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