rcu: Add exp_funnel_lock() fastpath

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This commit speeds up the low-contention case, especially for systems
with large rcu_node trees, by attempting to directly acquire the
->exp_mutex.  This fastpath checks the leaves and root first in
order to avoid excessive memory contention on the mutex itself.

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

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Paul E. McKenney 2016-03-16 13:22:53 -07:00

parent f6a12f34a4

commit 356051e1de

1 changed files with 10 additions and 0 deletions

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kernel/rcu/tree.c

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