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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>
This commit is contained in:
Paul E. McKenney 2014-06-23 11:52:59 -07:00
parent 128ea442b1
commit 9963185c04
1 changed files with 9 additions and 0 deletions
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9
Documentation/RCU/rcuref.txt
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@ -1,5 +1,14 @@
Reference-count design for elements of lists/arrays protected by RCU.
Please note that the percpu-ref feature is likely your first
stop if you need to combine reference counts and RCU. Please see
include/linux/percpu-refcount.h for more information. However, in
those unusual cases where percpu-ref would consume too much memory,
please read on.
------------------------------------------------------------------------
Reference counting on elements of lists which are protected by traditional
reader/writer spinlocks or semaphores are straightforward: