rcu: Segregate rcu_state fields to improve cache locality

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The fields in the rcu_state structure that are protected by the
root rcu_node structure's ->lock can share a cache line with the
fields protected by ->onofflock.  This can result in excessive
memory contention on large systems, so this commit applies
____cacheline_internodealigned_in_smp to the ->onofflock field in
order to segregate them.

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

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Dimitri Sivanich 2012-06-29 14:17:29 -07:00 • committed by Paul E. McKenney

parent b626c1b689

commit b402b73b3a

1 changed files with 2 additions and 1 deletions

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kernel/rcutree.h

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