documentation: Add pointer to percpu-ref for RCU and refcount
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
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Reference-count design for elements of lists/arrays protected by RCU.
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Please note that the percpu-ref feature is likely your first
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stop if you need to combine reference counts and RCU. Please see
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include/linux/percpu-refcount.h for more information. However, in
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those unusual cases where percpu-ref would consume too much memory,
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please read on.
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------------------------------------------------------------------------
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Reference counting on elements of lists which are protected by traditional
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reader/writer spinlocks or semaphores are straightforward:
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