X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=kernel%2FKconfig.preempt;h=9fdba03dc1fcd119c31274fb3590480aa1db9f05;hb=2952ff1a598ce300c911d00d82872d00ca8b61ca;hp=0b46a5dff4c047c72f9d062484124bd3261cf1a3;hpb=8678887e7fb43cd6c9be6c9807b05e77848e0920;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 0b46a5dff4c..9fdba03dc1f 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -23,7 +23,7 @@ config PREEMPT_VOLUNTARY
 	  "explicit preemption points" to the kernel code. These new
 	  preemption points have been selected to reduce the maximum
 	  latency of rescheduling, providing faster application reactions,
-	  at the cost of slighly lower throughput.
+	  at the cost of slightly lower throughput.
 
 	  This allows reaction to interactive events by allowing a
 	  low priority process to voluntarily preempt itself even if it
@@ -43,7 +43,7 @@ config PREEMPT
 	  even if it is in kernel mode executing a system call and would
 	  otherwise not be about to reach a natural preemption point.
 	  This allows applications to run more 'smoothly' even when the
-	  system is under load, at the cost of slighly lower throughput
+	  system is under load, at the cost of slightly lower throughput
 	  and a slight runtime overhead to kernel code.
 
 	  Select this if you are building a kernel for a desktop or
@@ -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.