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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2008-01-31 22:45:22 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-31 22:45:22 +0100
commit095031052b4c03a7c8ffa51cbab031e442c4f8b7 (patch)
tree97f4fd1592b98b1217826dc838fb70d6e8185890
parent8af03e782cae1e0a0f530ddd22301cdd12cf9dc0 (diff)
downloadlinux-linaro-095031052b4c03a7c8ffa51cbab031e442c4f8b7.tar.gz
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>
-rw-r--r--init/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 0d0bbf218f1..dcc96a8c8c6 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"