From 9963185c04727769913a2758c0fcccb821c77098 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 23 Jun 2014 11:52:59 -0700 Subject: [PATCH] documentation: Add pointer to percpu-ref for RCU and refcount Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett Reviewed-by: Lai Jiangshan --- Documentation/RCU/rcuref.txt | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/RCU/rcuref.txt b/Documentation/RCU/rcuref.txt index 141d531aa14b..613033ff2b9b 100644 --- a/Documentation/RCU/rcuref.txt +++ b/Documentation/RCU/rcuref.txt @@ -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: -- 2.11.0