X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=kernel%2FKconfig.preempt;h=9fdba03dc1fcd119c31274fb3590480aa1db9f05;hp=c64ce9c14207644bfc07c5f2c729f5fe9b66c5b6;hb=82638844d9a8581bbf33201cc209a14876eca167;hpb=81f8320f624a785d77443ace83391d0fdee695f6

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index c64ce9c14207..9fdba03dc1fc 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -52,14 +52,28 @@ config PREEMPT
 
 endchoice
 
-config PREEMPT_BKL
-	bool "Preempt The Big Kernel Lock"
-	depends on SMP || PREEMPT
-	default y
+config PREEMPT_RCU
+	bool "Preemptible RCU"
+	depends on PREEMPT
+	default n
 	help
-	  This option reduces the latency of the kernel by making the
-	  big kernel lock preemptible.
+	  This option reduces the latency of the kernel by making certain
+	  RCU sections preemptible. Normally RCU code is non-preemptible, if
+	  this option is selected then read-only RCU sections become
+	  preemptible. This helps latency, but may expose bugs due to
+	  now-naive assumptions about each RCU read-side critical section
+	  remaining on a given CPU through its execution.
 
-	  Say Y here if you are building a kernel for a desktop system.
 	  Say N if you are unsure.
 
+config RCU_TRACE
+	bool "Enable tracing for RCU - currently stats in debugfs"
+	depends on PREEMPT_RCU
+	select DEBUG_FS
+	default y
+	help
+	  This option provides tracing in RCU which presents stats
+	  in debugfs for debugging RCU implementation.
+
+	  Say Y here if you want to enable RCU tracing
+	  Say N if you are unsure.