Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=095031...
Commit:     095031052b4c03a7c8ffa51cbab031e442c4f8b7
Parent:     8af03e782cae1e0a0f530ddd22301cdd12cf9dc0
Author:     Paul E. McKenney <paulmck@linux.vnet.ibm.com>
AuthorDate: Thu Jan 31 22:45:22 2008 +0100
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Thu Jan 31 22:45:22 2008 +0100

    RCU: add help text for "RCU implementation type"
    
    This patch supplies help text for the "RCU implementation type"
    kernel configuration choice.
    
    Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 init/Kconfig |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 0d0bbf2..dcc96a8 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -775,6 +775,14 @@ config PREEMPT_NOTIFIERS
 choice
 	prompt "RCU implementation type:"
 	default CLASSIC_RCU
+	help
+	  This allows you to choose either the classic RCU implementation
+	  that is designed for best read-side performance on non-realtime
+	  systems, or the preemptible RCU implementation for best latency
+	  on realtime systems.  Note that some kernel preemption modes
+	  will restrict your choice.
+
+	  Select the default if you are unsure.
 
 config CLASSIC_RCU
 	bool "Classic RCU"
-
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